Reference

Oxidation reactor

Oxidation reactor. Klingman, Gilbert E.Some chemicals with cas registry numbers like 99-75-2 and 99-94-5 are also used. (Bechtel International Corp., USA). Eur. Pat. Appl. EP 96082 A1 21 Dec 1983, 19 pp. DESIGNATED STATES: R: DE, FR, IT, NL. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C07C069-82; C07C063-04; C07C051-265; C07C067-39; B01J008-22; B01J019-26. APPLICATION: EP 82-104886 3 Jun 1982. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 25 p-Xylene [106-42-3] is oxidized to p-toluic acid [99-94-5] and/or methyl p-toluate [99-75-2] is oxidized to Me terephthalate [1679-64-7] in a catalyst-contg. medium flowing through an induced-circulation reactor comprising 2 vertical columns connected at the tops and bottoms. Circulation is induced because 1 column contains a gas-liq. mixt. which rises while the denser, essentially ungasified liq. in the other column falls. Temp. variations in the reactor are <6°. The reactor is esp. useful for the manuf. of dimethyl terephthalate [120-61-6]. The reactor is operated continuously by venting gas from the reactor while adding starting compds. and removing oxidn. products. .

Dimethyl terephthalate

Dimethyl terephthalate. Boebel, Henryk; Pokorska, Zofia; Smoczynski, Pawel; Fiszer, Renata; Noga, Kazimierz (Zaklady Wlokien Chemicznych "Chemitex-Elana", Pol.). Pol. PL 116445 B1 31 Aug 1983, 4 pp. (Polish). (Poland). CODEN: POXXA7. CLASS: IC: C07C069-82. APPLICATION: PL 78-208788 1 Aug 1978. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Di-Me terephthalate (I) [120-61-6] is prepd. by oxidizing with air O of a .1-20 (by wt.) mixt. of (a) p-xylene (II) [106-42-3] or II-Me p-toluate (III) [99-75-2] with (b) distn. residue from prepn. of crude esters contg. polycyclic arom. compds. and Me esters of monocyclic arom. acids and, optionally, components of the catalytic system. The temp. during the oxidn. is 140-180°. The obtained carboxylic acids are esterified with MeOH, sepd. and purified by distn., and crystd. from MeOH. Thus, a mixt. of 160 g II (purity 99.8%) contg. fatty acids salts of Co, Mn, and Ni (18 mg as metals, at metal wt. ratio :1, resp.) and 40 g distn. residue b contg. I 9.8, III 0.8, and methyl p-formylbenzoate (IV) [1571-08-0] 0.34%, in addn. to high-boiling arom. compds., was oxidized by passing O at 10 dm3/h for 4 h at 160° and 0.6 MPa. The obtained product contained II 48.0, III 0.2, IV 0.3, I 3.6, Me terephthalate 3.5, and terephthalic acid 0.5%, as compared to 63.2, 0.3, 0.3, 0. 99-75-2 and 7440-02-0 are just another two chemicals used in this study.6, 0.9, -, resp., for oxidn. of II alone under the same conditions. .