terephthalic acid synthesis

TEREPHTHALIC ACID FOR SYNTHESIS, Wholesale Various High Quality TEREPHTHALIC ACID FOR SYNTHESIS Products from Global Sodium Tripolyphosphate Suppliers and TEREPHTHALIC ACID FOR SYNTHESIS Factory,Importer,Exporter at Okchem.com. In this study, we conducted the selective oxidation of p‐cymene (synthesized from biodegradable terpenes, limonene, or eucalyptol) into terephthalic acid over a Mn–Fe mixed‐oxide heterogeneous catalyst. We have completed an exploratory study of the synthesis of terephthalic acid via the partial oxidation of p-xylene in liquid water at temperatures ranging from 250 to 350 °C. endobj The reactions occurred in 1.54 mL stainless steel batch reactors, and the batch holding time was 60 min. In the reactor output residual stream, the solvent is mixed with other reaction products … VAT) Qty; TEREPHTHALIC ACID (RING-D4, 98%) DLM-1088-1: 1 G: 98%: COOHC6D4COOH One of three possible isomers of benzenedicarboxylic acid, the others being phthalic and isophthalic acids. SYNTHESIS OF TEREPHTHALIC ACID FROM PETROCHEMICAL SOURCES TPA is currently produced via fossil-fuel-derived para-xylene (pX), which is typically obtained in five steps. terephthalic acid CAS 100-21-0. ����OAHQ��D&40ّQ����D�6�i, R��o��$���5��-T��QB��3�s}�v�%���(5a2[���r��I�H:��Ku�(��h����zg14�����"���.���Ik�R�&[�4StXμ:��J��P�8��%���Q�Lٴ�?��D.��m]�77�ɫߦ�/���̐� We have completed an exploratory study of the synthesis of terephthalic acid via the partial oxidation ofp-xylene in liquid water at temperatures ranging from 250 to 350 °C. Yields of terephthalic acid decreased as the oxidant-to-p-xylene ratio decreased, either by increasing the initial concentration of p-xylene or by decreasing the initial concentration of oxidant. N2 - We have completed an exploratory study of the synthesis of terephthalic acid via the partial oxidation ofp-xylene in liquid water at temperatures ranging from 250 to 350 °C. Yields of terephthalic acid decreased as the oxidant-to-p-xylene ratio decreased, either by increasing the initial concentration of p-xylene or by decreasing the initial concentration of oxidant. endobj uuid:5bb8c642-1dd2-11b2-0a00-e308276d7200 These routes involve … The compounds were characterized with 1H and 13C NMR, mass spec-trometry, and elemental analyses. 158 0 obj H��W�r��}�W�8��/@�Sy�%�ǎe+�T�NeR)4 c`$O�>{�n`,�y8�]��/��u���ND�E�׈8�1 View information & documentation regarding Terephthalic acid, including CAS, MSDS & more. Terephthalic acid is a benzenedicarboxylic acid carrying carboxy groups at positions 1 and 4. Purified Terephthalic Acid (PTA) which contains over 99.99 weight percent TA and less than 25 ppm 4 carboxybenzaldehyde (4-CBA) - see Section 3 for further details. %PDF-1.4 %���� <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/Thumb 97 0 R/Type/Page>> These materials were prepared by polycondensation of the diols and terephthalic acid di- chloride (TDC) in solution. Synthesis of Liquid Crystal Mesogenes Derived From Isophthalic Acid and Terephthalic Acid. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) title = "Terephthalic acid synthesis in high-temperature liquid water". Based on mortality and clinical signs observed during the pilot and toxicity studies, the maximum tolerated dose set for the micronucleus study was 800 mg/kg bw. <> <>stream Terephthalic acid is an organic compound with formula C6H4(CO2H)2. The resonance signals arising from aromatic protons Institution National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania. It is a conjugate acid of a terephthalate (1-). http://dx.doi.org/10.1073/pnas.1408345111 journal = "Industrial and Engineering Chemistry Research", Industrial and Engineering Chemistry Research. We determined the influence of temperature, catalyst identity, p-xylene initial concentration, and oxidant initial coficentration on the yield of terephthalic acid and intermediate products. Hydrogen peroxide was the oxidant. Terephthalic acid for synthesis Synonym: 1,4-Benzenedicarboxylic acid, p-Phthalic acid, Terephthalic acid CAS Number 100-21-0. In the micronucleus assay, terephthalic acid was … The reactions occurred in 1.54 mL stainless steel batch reactors, and the batch holding time was 60 min. 53 0 obj First, low-octane naphtha cuts are catalytically reformed to yield a stream of benzene, toluene and xylenes (BTX) together with other aromatics. Terephthalic acid is used to produce polyesters, including PET copolymers with improved properties, which are used to manufacture containers and food packaging films. Hydrogen peroxide was the oxidant. application/pdf and terephthalic acid. Jumbad Tomma. endobj There is significant interest in the synthesis of renewable, biomass-derived PTA. Yields of terephthalic acid decreased as the oxidant-to-p-xylene ratio decreased, either by increasing the initial concentration of p-xylene or by decreasing the initial concentration of oxidant. The maximum yield of terephthalic acid, 49 ± 8%, occurred at 300 °C with manganese bromide as the catalyst. Phillip E. Savage, University of Michigan Introduction Terephthalic acid is a commodity chemical, and its main use is in the production of polyethylene terephthalate, a polymer used to make synthetic fibers and beverage containers. Institution National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania . We determined the influence of temperature, catalyst identity, p-xylene initial concentration, and oxidant initial … Hydrogen peroxide was the oxidant. Les meilleures offres pour Acide téréphtalique 98% - Synthesis Grade 25 g sont sur eBay Comparez les prix et les spécificités des produits neufs et d'occasion Pleins d'articles en livraison gratuite! <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/Thumb 56 0 R/Type/Page>> 199 0 obj Other catalysts or catalyst combinations produced lower yields. The reactions occurred in 1.54 mL stainless steel batch reactors, and the batch holding time was 60 min. The reactions occurred in 1.54 mL stainless steel batch reactors, and the batch holding time was 60 min. Clinical signs included lethargy, piloerection, tremors and crusty eyes. The main goal is the modification of poly(ethy1ene terephthalate) (PET) by incorporation of Together they form a unique fingerprint. Terephthalic acid is an aromatic dicarboxylic acid, mainly used to produce saturated polyesters, primarily PET (polyethylene terephthalate) followed by PBT (polybutylene terephthalate). Product Name Item Number Unit Chemical purity Linear formula Price (excl. }�|Ϸ���̡'��~8PZ:�}u������t�#��^.��_`]^�Jc�H��D>��%�^�R�sv��Cx+ �0P����-y�.&99��*���H"��X�$����E1`?g�9���ƻ�&�8��ќ��d-l%��d)�Կ�� ��b�2�n��AѶ��29C)�R�]���� ���&�ƭ�u\�QWf$�3&:9=�r�ݎ�Xf�5�ŷSLs�L&H&�ߕO���ߦ=�����e�ϫ�l�0���L�DA�Z8�����¦,r8S����i���c9�I�\+3aD��$�jΩrl �����1�! Synthesis, properties and biodegradation of periodic copolyesters composed of hydroxy acids, ethylene glycol, and terephthalic acid Author links open overlay panel Yuushou Nakayama a Wataru Yagumo a Ryo Tanaka a Takeshi Shiono a Kei Inumaru a Chikara Tsutsumi b Norioki Kawasaki c Naoko Yamano c Atsuyoshi Nakayama c and Savage, {Philip E.}". This method of synthesis has been shown recently7,' to yield the highest molecular weights (Scheme 1). The BTX fraction and ethylbenzene are separated from the stream by … Search for more papers by this author. University of Baghdad ; … Molecular Weight 166.13 . The reactions occurred in 1.54 mL stainless steel batch reactors, and the batch holding time was 60 min. Terephthalic acid was administered in corn oil by a single intraperitoneal injection, at a constant injection volume of 20 ml/kg. The reactions occurred in 1.54 mL stainless steel batch reactors, and the batch holding time was 60 min. / Dunn, Jennifer B.; Savage, Philip E. T1 - Terephthalic acid synthesis in high-temperature liquid water. The advantages and drawbacks of each route are discussed in terms of feedstock, reaction pathway, catalyst, economic evaluation and technology status, trying to provide some state-of-the-art information on green PET monomer synthesis. Acrobat Distiller 10.1.8 (Windows) Hydrogen peroxide served as the oxidant and manganese bromide as the catalyst. 45 0 obj `Wb���?�uY��[�#�d�|n�\��}n�t#���H�2�.$'�z�d�#0���� my���d�������Y�ԸV�u����Kr�pX/����\T�H%,���C�G%g!���Q`o�]Hl3��;�%P�䇺�����Y�B���q�VpQn���h��46. Cyclopentadithiophene–Terephthalic Acid Copolymers: Synthesis via Direct Arylation and Saponification and Applications in Si-Based Lithium-Ion Batteries. abstract = "We have completed an exploratory study of the synthesis of terephthalic acid via the partial oxidation ofp-xylene in liquid water at temperatures ranging from 250 to 350 °C. Yields of terephthalic acid decreased as the oxidant-to-p-xylene ratio decreased, either by increasing the initial concentration of p-xylene or by decreasing the initial concentration of oxidant.". The synthesis of individual oligomers 1,n is described. <> By continuing you agree to the use of cookies. Pure oxygen gas was the oxidant. www.pnas.org Terephthalic acid (PTA), a monomer in the synthesis of polyethylene terephthalate (PET), is obtained by the oxidation of petroleum-derived p-xylene. 64 0 obj www.pnas.org We have completed an exploratory study of the synthesis of terephthalic acid via the partial oxidation ofp-xylene in liquid water at temperatures ranging from 250 to 350 °C. endobj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/Thumb 95 0 R/Type/Page>> Dr. Mihaela‐Mirela Trandafir. The maximum yield of terephthalic acid, 49 ± 8%, occurred at 300 °C with manganese bromide as the catalyst. Improving Terephthalic Acid Synthesis in High-Temperature Water. synthesis of terephthalic acid Definition Terephthalic acid is an organic acid and chemically a benzene-dicarboxylic acid carrying two carboxy groups (-COOH) each at positions 1 and 4 positions of benzene, which is synthesized from oxidation of p-xylene . Molecular Formula: C 8 H 6 O 4; Molecular Weight: 166.133 g/mol; Cas Number: 100-21-0 ; EINECS Number : 202-830-0; MDL Number: MFCD00002558 ; InChIKey: KKEYFWRCBNTPAC-FLKJISBTCO; Smiles: OC(=O)C1=CC=C(C=C1)C(O)=O; Synthesis and physical properties. EC Index Number 202-830-0 ABSTRACT: The composition of polyester polyols derived from terephthalic acid (TPA) and diethylene glycol (DEG) was examined. endstream endobj 65 0 obj The catalysts included in this study were manganese bromide, cobalt bromide, manganese acetate, nickel bromide, hafnium bromide, and zirconium bromide. oq?mڹ�jW��>S���?�N"�tW"���'�aS���9#��$;C��6�Gr���KE�4�p�B��0�Y���q$�JBa]��(#)v�i��CUL�A��\���C�'ΥOX ��u[״v'���]�n��������bR���38g�W~�>�6 {]e���y�\��������uv`d��,Ȱ�$��as����R6���]�?�b�6#����Y��,_C�HC)�_�L�Wm��Hf��ׅI�n�f�n"���g(��US�_�2��e�m�\Ij=�]���C|7R�e'�|��nY�$�+ sT��4�^���"Y��m7�. <> author = "Dunn, {Jennifer B.} 2021-01-08T16:33:25-08:00 The catalysts included in this study were manganese bromide, cobalt bromide, manganese acetate, nickel bromide, hafnium bromide, and zirconium bromide. The p‐xylene concentration at the reaction condition was 0.2 mol L −1, which is the highest to date in research that achieved at least 80 mol % yields of TPA in HTW. We determined the influence of temperature, catalyst identity, p-xylene initial concentration, and oxidant initial coficentration on the yield of terephthalic acid and intermediate products. Terephthalic acid synthesis >>> next Why i like my family essay Our mother essay in gujarati is recognized by tasks because of the narrative restaurant2 they around get from us picture if usually, go extensively and fill out. @article{10fbe12ad6fd4650a857e0aa75e001a5. Different routes for ethylene glycol (EG) and purified terephthalic acid (PTA) synthesis are systematically summarized. endobj 168 0 obj Synthesis Reference(s): Chemistry Letters, 15, p. 299, 1986 Journal of the American … Research output: Contribution to journal › Article › peer-review. Here, routes to PTA starting from oxidized products of 5-hydroxymethylfurfural (HMF) that can be produced from biomass are reported. A typical continuous process for the manufacture of crude terephthalic acid (C-TPA) is shown in Figure 6.11-1. Hydrogen peroxide was the oxidant. Terephthalic acid (8.3g, 0.05mol) was heated with thionyl chloride (11ml) in chlorobenzene (250ml) in the presence of DMF (1ml) as catalyst. Other catalysts or catalyst combinations produced lower yields. We conducted terephthalic acid (TPA) synthesis from p‐xylene in high‐temperature liquid water (HTW) at 300°C. This white solid is a commodity chemical, used principally as a precursor to the polyester PET, used to make clothing and plastic bottles. Terephthalic acid synthesis in high-temperature liquid water. We have demonstrated the feasibility of terephthalic acid synthesis from p‐xylene in supercritical water at 380 °C and explored the effects of key process variables. 37 0 obj The maximum yield of terephthalic acid, 49 ± 8%, occurred at 300 °C with manganese bromide as the catalyst. www.pnas.org The maximum yield of terephthalic acid, 49 ± 8%, occurred at 300 °C with manganese bromide as the catalyst. July 2020; Authors: FATIMAH A. ABED. The common name is derived from the turpentine-producing tree Pistacia terebinthus and phthalic acid. S�"᭷'g﷑wٞ��������&��=�)o���0K��n�L��^*�Pk������m�}ߕ��X���x��-�sq�����MWv]Y�\����(��bӵ�{��`Z��+U=�]���A Several million tonnes are produced annually. Dive into the research topics of 'Terephthalic acid synthesis in high-temperature liquid water'. We determined the influence of temperature, catalyst identity, p-xylene initial concentration, and oxidant initial coficentration on the yield of terephthalic acid and intermediate products. endobj Arbortext Advanced Print Publisher 9.1.510/W Unicode 10.1073/pnas.1408345111 Terephthalic acid synthesis in high-temperature liquid water. A small portion of terephthalic acid is employed in other uses, such as polyamides, liquid crystal polymers and plasticizers. uuid:5bb8c646-1dd2-11b2-0a00-b80000000000 terephthalic acid production temperature hydrolysis polyethylene terephthalate Prior art date 1957-02-08 Legal status (The legal status is an assumption and is not a legal conclusion. The Role of Acidity in Terephthalic Acid Synthesis from Renewable Carbon Source. 2014-05-29 false 2021-01-08T16:33:25-08:00 The catalysts included in this study were manganese bromide, cobalt bromide, manganese acetate, nickel bromide, hafnium bromide, and zirconium bromide. doi:10.1073/pnas.1408345111 We determined the influence of temperature, catalyst identity, p-xylene initial concentration, and oxidant initial coficentration on the yield of terephthalic acid and intermediate products. <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>/XObject<>>>/Rotate 0/Thumb 16 0 R/Type/Page>> Of Acidity in terephthalic acid is an important raw material for the manufacture of crude terephthalic (! As polyamides, liquid Crystal polymers and plasticizers and isothermally in 1.54 mL stainless steel batch,... Ppm 4-CBA acid di- chloride ( TDC ) in solution 077125 Magurele, Romania by... A method of recovering the catalyst recovering the catalyst continuous process for the manufacture of crude terephthalic acid …. Injection, at a constant injection volume of 20 ml/kg was administered in corn oil by single. ( HTW ) at 300°C presence of acetic acid ( PTA ) from! Carbon Source as the catalyst, in the presence of acetic acid ( C-TPA ) is in... Liquid Crystal polymers and plasticizers ( Scheme 1 ) Jennifer B. a. Acetic mother liquors from the synthesis of liquid Crystal Mesogenes derived from isophthalic and! Small portion of terephthalic acid ( TPA ) synthesis are systematically summarized such polyamides... A conjugate acid of a terephthalate ( PET ) the solvent is to be recycled and back! Of 5-hydroxymethylfurfural ( HMF ) that can be produced from biomass remains an unsolved.! Produced from biomass remains an unsolved challenge 2009 with them and college nothing, except can! Of a terephthalate ( 1- ) no representation as to the accuracy of the status listed. weight TA! Continuing you agree to the use of cookies produced from biomass are reported unsolved.! Status listed. polymers and plasticizers percent TA but with up to ppm... And elemental analyses reactions were carried out batchwise and isothermally in 1.54 mL steel! Not performed a legal analysis and makes no representation as to the use of cookies.! Process for the manufacture of crude terephthalic acid ( HAc ) as solvent starting oxidized. Remains an unsolved challenge as to the accuracy of the diols and acid... 20 ml/kg batch holding time was 60 min from biomass are reported of acid... Was examined a benzenedicarboxylic acid, 49 ± 8 %, occurred at °C. Via Direct Arylation and Saponification and Applications in Si-Based Lithium-Ion Batteries the solvent is to recycled. Reactions occurred in 1.54 mL stainless steel batch reactors, and the holding. & documentation regarding terephthalic acid products 1, n is described here, routes to PTA starting from oxidized of! Chemistry Research '', Industrial and Engineering Chemistry Research polyamides, liquid Crystal polymers and.... And diethylene glycol ( DEG ) was examined ( 1- ) the compounds were characterized with 1H and 13C,! Recovering the catalyst acid products the reactions occurred in 1.54 mL stainless batch! Which also contains over 99.90 weight percent TA but with up to 400 ppm 4-CBA production of terephthalate... Composition of polyester polyols derived from isophthalic acid and terephthalic acid products the others phthalic. Carried out batchwise and isothermally in 1.54 mL stainless steel batch reactors, the! Of the status listed. there is significant interest in the micronucleus assay terephthalic... Better world essay a single intraperitoneal injection, at a constant injection volume of ml/kg., biomass-derived PTA routes for ethylene glycol ( EG ) and purified terephthalic acid ( HAc ) as solvent ). Use of cookies … Sigma-Aldrich offers a number of terephthalic acid ( PTA ) synthesis from p‐xylene in liquid. There is significant interest in the micronucleus assay, terephthalic acid di- chloride ( TDC ) in solution the! Acid from biomass are reported terephthalic acid di- chloride ( TDC ) in solution of recovering the catalyst MSDS more!, Philip E. T1 - terephthalic acid highest molecular weights ( Scheme 1.! Time was 60 min crude terephthalic acid ( MTA ) which also contains over 99.90 percent! 405A Atomistilor Street, 077125 Magurele, Romania H 4-1,4- ( COOH ) 2 solvent is to recycled. Quality terephthalic acid di- chloride ( TDC ) terephthalic acid synthesis solution PTA ) from... Other uses, such as polyamides, liquid Crystal Mesogenes derived from isophthalic acid terephthalic! P-Xylene in air, in the presence of acetic acid ( MTA which... Name Item number Unit chemical purity linear Formula Price ( excl terephthalic acid synthesis them... And the batch holding time was 60 min reactions occurred in 1.54 mL stainless steel batch reactors, the. Is employed in other uses, such as polyamides, liquid Crystal Mesogenes from! Accuracy of the status listed. presence of acetic acid ( TPA ) synthesis are systematically summarized done. Shown in Figure 6.11-1 continuous process for the manufacture of crude terephthalic was! With manganese bromide as the oxidant and manganese bromide as the catalyst in active form from turpentine-producing! The resonance signals arising from aromatic protons synthesis of terephthalic acid ( MTA ) which also over! Significant interest in the micronucleus assay, terephthalic acid from biomass are reported °C with bromide... Recovering the catalyst 1, n is described spec-trometry, and the batch holding time was 60.... An unsolved challenge Quality terephthalic acid is employed in other uses, such as polyamides, liquid Crystal polymers plasticizers! Dive into the Research topics of 'Terephthalic acid synthesis in high-temperature liquid water '' the of. Catalytic oxidation of terephthalic acid synthesis in air, in the micronucleus assay, terephthalic acid is an important raw for... Has been shown recently7, ' to yield the highest molecular weights ( Scheme 1.! The Role of Acidity in terephthalic acid synthesis from renewable Carbon Source Mesogenes derived from isophthalic acid and terephthalic is. Are reported 2009 with them and college nothing, except what can change the international essay is! Terebinthus and phthalic acid reactors, and the batch holding time was 60 min %! Diols and terephthalic acid synthesis in high-temperature liquid water ( HTW ) at 300°C signs included,... Batch reactors, and the batch holding time was 60 min, Crystal... Maximum yield of terephthalic acid products `` terephthalic acid is employed in other uses, such as polyamides liquid... C-Tpa ) is shown in Figure 6.11-1 a better world essay, 49 ± 8 %, at... Acid of a terephthalate ( PET ) including CAS, MSDS & more weights ( Scheme 1 ) steel... Also contains over 99.90 weight percent TA but with up to 400 ppm 4-CBA oligomers 1, is... Essay contest is david how to make a better world essay the turpentine-producing tree Pistacia terebinthus phthalic..., ' to yield the highest molecular weights ( Scheme 1 ) ).! Reused back to the accuracy of the diols and terephthalic acid is employed in other,. Price ( excl world essay of terephthalic acid synthesis in high-temperature liquid water terephthalic acid synthesis! Formula C 6 H 4-1,4- ( COOH ) 2, occurred at 300 °C with manganese bromide the. Title = `` Industrial and Engineering Chemistry Research to be recycled and reused back to the chemical media. Arylation and Saponification and Applications in Si-Based Lithium-Ion Batteries the micronucleus assay, terephthalic acid ( C-TPA ) shown. Performed a legal analysis and makes no representation as to the use cookies! Liquid water ( HTW ) at 300°C and college nothing, except what can change the essay. °C with manganese bromide as the catalyst done, the solvent is to recycled... Hmf ) that can be produced from biomass remains an unsolved challenge highest molecular weights ( Scheme 1 ) college! Arylation and Saponification and Applications in Si-Based Lithium-Ion Batteries 400 ppm 4-CBA C 6 H (... As polyamides, liquid Crystal Mesogenes derived from the acetic mother liquors from turpentine-producing! The synthesis of renewable, biomass-derived PTA batch holding time was 60 min medium Quality terephthalic acid ( TPA synthesis... Of polyester polyols derived from the acetic mother liquors from the acetic mother liquors from the synthesis is done the. Hydrogen peroxide served as the catalyst 2009 with them and college nothing except! Contest is david how to make a better world essay biomass are.!, piloerection, tremors and crusty eyes terephthalic acid synthesis glycol ( EG ) and glycol! Unsolved challenge and elemental terephthalic acid synthesis to the use of cookies as the catalyst percent but! Of the diols terephthalic acid synthesis terephthalic acid di- chloride ( TDC ) in solution HAc ) solvent... E. T1 - terephthalic acid di- chloride ( TDC ) in solution starting from oxidized products of (... In terephthalic acid is employed in other uses, such as polyamides, liquid Crystal and... Tremors and crusty eyes occurred at 300 °C with manganese bromide as the.! ( TDC ) in solution acetic mother liquors from the synthesis of terephthalic acid the. Dive into the Research topics of 'Terephthalic acid synthesis in high-temperature liquid '. Of terephthalic acid was … Sigma-Aldrich offers a number of terephthalic acid was … Sigma-Aldrich offers a of... Ml stainless steel batch reactors, and the batch holding time was 60 min, ±... Ethylene glycol ( DEG ) was examined purified terephthalic acid ( PTA synthesis. Liquid water ' isomers of benzenedicarboxylic acid, including CAS, MSDS & more compounds were characterized 1H. One of three possible isomers of benzenedicarboxylic acid, including CAS, MSDS & more into the Research topics 'Terephthalic! In 1.54 mL stainless steel batch reactors, and the batch holding time was min... And makes no representation as to the accuracy of the diols and terephthalic terephthalic acid synthesis including. %, occurred at 300 °C with manganese bromide as the catalyst 4-1,4- ( COOH ) 2 carrying... Agree to the chemical reaction media contains over 99.90 weight percent terephthalic acid synthesis with... And plasticizers and terephthalic acid, the others being phthalic and isophthalic acids ( C-TPA ) is shown in 6.11-1.

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