Terephthalic acid, dimethyl ester

Chemical Designations - Synonyms Terephthalic Acid, Dimethyl Ester Chemical Formula 1,4-CH3OOCC5H4COOCH3. 

Terephthalic Acid, Dimethyl Ester Tergitol 3-A-B Nonionic Tergitol Nonionic 45-S-10 Tergitol Nonionic 45-S-10 Tergitol Nonionic TMN Terpinene... 

ABA ABS ABS-PC ABS-PVC ACM ACS AES AMMA AN APET APP ASA BR BS CA CAB CAP CN CP CPE CPET CPP CPVC CR CTA DAM DAP DMT ECTFE EEA EMA EMAA EMAC EMPP EnBA EP EPM ESI EVA(C) EVOH FEP HDI HDPE HIPS HMDI IPI LDPE LLDPE MBS Acrylonitrile-butadiene-acrylate Acrylonitrile-butadiene-styrene copolymer Acrylonitrile-butadiene-styrene-polycarbonate alloy Acrylonitrile-butadiene-styrene-poly(vinyl chloride) alloy Acrylic acid ester rubber Acrylonitrile-chlorinated pe-styrene Acrylonitrile-ethylene-propylene-styrene Acrylonitrile-methyl methacrylate Acrylonitrile Amorphous polyethylene terephthalate Atactic polypropylene Acrylic-styrene-acrylonitrile Butadiene rubber Butadiene styrene rubber Cellulose acetate Cellulose acetate-butyrate Cellulose acetate-propionate Cellulose nitrate Cellulose propionate Chlorinated polyethylene Crystalline polyethylene terephthalate Cast polypropylene Chlorinated polyvinyl chloride Chloroprene rubber Cellulose triacetate Diallyl maleate Diallyl phthalate Terephthalic acid, dimethyl ester Ethylene-chlorotrifluoroethylene copolymer Ethylene-ethyl acrylate Ethylene-methyl acrylate Ethylene methacrylic acid Ethylene-methyl acrylate copolymer Elastomer modified polypropylene Ethylene normal butyl acrylate Epoxy resin, also ethylene-propylene Ethylene-propylene rubber Ethylene-styrene copolymers Polyethylene-vinyl acetate Polyethylene-vinyl alcohol copolymers Fluorinated ethylene-propylene copolymers Hexamethylene diisocyanate High-density polyethylene High-impact polystyrene Diisocyanato dicyclohexylmethane Isophorone diisocyanate Low-density polyethylene Linear low-density polyethylene Methacrylate-butadiene-styrene... 

TERABOL (74-83-9) see methyl bromide. TERCYL (63-25-2) see carbaryl. TEREBENTHINE (French) (8006-64-2 9005-90-7) see turpentine. TEREFTALATO de DIMETILO (Spanish) or TEREPHTHALIC ACID, DIMETHYL ESTER or TEREPHTHALIC ACID, METHYL ESTER (120-61-6) C,oHio04 Combustible solid. The dust or powder forms an explosive mixture with air (explosion limits in air 33.0 g/m to... 

Polycarhaxy/ic acids Terephthalic acid (dimethyl ester) hard Isophthalic acid hard... 

Example Terephthalic acid dimethyl ester -i- glycol polyethylene tere-phthalate -1- methyl alcohol (re-esterification). 

Methyl 4-carbomethoxybenzoate Methyl p-(methoxycarbonyl) benzoate Terephthalic acid, dimethyl ester Terephthalic acid, methyl ester... 

Figure 7.9 Flow diagram of the production of terephthalic acid dimethyl ester...

Terephthalic acid dimethyl ester see Dimethyl benzene-1,4-dicarboxylate TETN see Triethylamine T etrachloro-1,2-difluoroethane syn. dR 112dR-112... 

The first oxidation step proceeds under conditions that lead only to the reaction of one methyl group and the monoacid is formed. To convert the second methyl group as well, it is necessary to form the monoadd methyl ester in the next step. After the second oxidation step the terephthalic dimethyl ester is formed under the same esterification conditions by reaction with methanol. Terephthahc dimethyl ester is later reacted directly with ethylene glycol to form the PET polymer with liberation of methanol. The total process provides a yield in terephthalic acid dimethyl ester of 85% with respect to p-xylene. 

Scheme 5.3.6 Reaction sequence of the consecutive oxidation and esterification ofp-xylol to produce terephthalic acid dimethyl ester-adapted from Baerns, 2006.

Xylenes are used inter alia as solvents, for example in the USA 180,000 t p.a. [13] and in Japan 90,000 t [33], particularly in the paint and printing ink industries (see also [5]). In eastern Europe it is also used for numerous applications in the shoe industry, o-xylene (besides naphthalene) is mainly oxidized to phthalic anhydride from which dyestuffs, phthalodinitrile and - by esterification with alcohols - plasticizers and raw materials for paints and varnishes are obtained [36, 38]. p-xylene is oxidized and processed with methanol to terephthalic acid dimethyl ester, from which polyesters are made [36, 38, 39]. For example, in 1972 2.9 million t polyester fibres were produced worldwide [39] and in 1979 more than 5 million t, which corresponds to 2.8 million t of p-xylene [30 a]. Polystyrene and copolymers (including expanded plastics) in particular are polymerized from styrene, and the world annual production of these products around 1975 was about 5 million t [39, 40],... 

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