683:
351:
213:
666:-toluate is oxidized with air in the presence of cobalt and manganese catalysts. The acid mixture resulting from the oxidation is esterified with methanol to produce a mixture of esters. The crude ester mixture is then distilled to remove all the heavy boilers and residue that are produced; lighter esters such as monomethyl terephthalate are recycled to the oxidation section. The raw DMT is then sent to the crystallization section to remove DMT isomers, residual acids and aromatic aldehydes.
31:
670:
554:
694:
DMT can also be made by a different route, namely direct esterification of terephthalic acid with methanol. The dimethyl terephthalate that is formed is then purified by distillation. Even terephthalic acid of low purity may be used in this method.
633:
Dimethyl terephthalate (DMT) has been produced in a number of ways. Conventionally, and still of commercial value, is the direct esterification of terephthalic acid. Alternatively, it can be prepared by alternating oxidation and
682:
819:
567:
802:
Richard J. Sheehan "Terephthalic Acid, Dimethyl
Terephthalate, and Isophthalic Acid" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005.
400:
662:-xylene (PX) and methanol consists of a multistep process involving both oxidation and esterification. A mixture of p-xylene (PX) and methyl
30:
823:
365:
123:
677:
Oxidation of methyl p-toluate followed by esterification also yields dimethyl terephthalate (DMT) as shown in the below reaction:
862:
857:
752:
847:
130:
882:
574:
887:
308:
329:
756:
748:
525:
507:
244:
220:
238:
771:) groups. Because DMT is volatile, it is an intermediate in some schemes for the recycling of PET, e.g. from
208:
877:
17:
779:
43:
346:
89:
150:
863:
U.S. National
Library of Medicine: Hazardous Substances Databank – Dimethyl+terephthalate
618:
190:
803:
643:
594:
428:
317:
669:
852:
170:
99:
848:
https://web.archive.org/web/20150503041344/http://www.teijin.com/products/chemicals/dmt/
350:
212:
772:
635:
545:
871:
497:
487:
273:
201:
266:
456:
181:
807:
744:
625:. It is a white solid that melts to give a distillable colourless liquid.
639:
622:
760:
477:
253:
221:
763:
ring substituted at the 1 and 4 positions with methyl carboxylate (-CO
544:
Except where otherwise noted, data are given for materials in their
614:
292:
161:
129:
122:
112:
374:
InChI=1S/C10H10O4/c1-13-9(11)7-3-5-8(6-4-7)10(12)14-2/h3-6H,1-2H3
384:
InChI=1/C10H10O4/c1-13-9(11)7-3-5-8(6-4-7)10(12)14-2/h3-6H,1-2H3
334:
562:
853:
http://www.inchem.org/documents/icsc/icsc/eics0262.htm
16:Not to be confused with the psychoactive chemical
735:in the presence of o-xylene at 250–300 °C.
272:
265:
690:Dimethyl terephthalate by direct esterification
98:
8:
654:Dimethyl terephthalate by the Witten process
20:, which is also commonly abbreviated as DMT.
59:1,4-Benzenedicarboxylic acid dimethyl ester
658:The method for the production of DMT from
349:
211:
189:
22:
798:
796:
794:
316:
668:
858:International Chemical Safety Card 0262
790:
759:(PBT). Structurally, DMT consists of a
405:
370:
345:
243:
778:Hydrogenation of DMT affords the diol
502:288 °C (550 °F; 561 K)
492:142 °C (288 °F; 415 K)
202:
77:Terephthalic acid dimethyl ester (2:1)
673:Structure of monomethyl terephthalate
387:Key: WOZVHXUHUFLZGK-UHFFFAOYSA-N
377:Key: WOZVHXUHUFLZGK-UHFFFAOYSA-N
169:
7:
256:
73:Methyl-p-(methoxycarbonyl)benzoate
48:Dimethyl benzene-1,4-dicarboxylate
14:
743:DMT is used in the production of
681:
552:
440:
29:
548:(at 25 °C , 100 kPa).
820:"Dimethyl Terephthalate (DMT)"
753:polytrimethylene terephthalate
446:
434:
1:
782:, which is a useful monomer.
71:Methyl 4-carbomethoxybenzoate
822:. 2013-05-02. Archived from
408:COC(=O)C1=CC=C(C=C1)C(=O)OC
904:
846:Supplier:Teijin Limited
757:polybutylene terephthalate
749:polyethylene terephthalate
15:
542:
421:
396:
361:
82:
75:Methyl terephthalate, di-
54:
42:
37:
28:
808:10.1002/14356007.a26_193
413:O=C(OC)c1ccc(cc1)C(=O)OC
24:Dimethyl terephthalate
674:
587:Dimethyl terephthalate
57:Dimethyl terephthalate
18:N,N-Dimethyltryptamine
780:cyclohexanedimethanol
672:
883:Terephthalate esters
245:Dimethyl+4-phthalate
61:Dimethyl 4-phthalate
44:Preferred IUPAC name
888:Commodity chemicals
464: g·mol
151:Beilstein Reference
69:Di-Me terephthalate
25:
675:
597:with the formula C
575:Infobox references
23:
619:terephthalic acid
583:Chemical compound
581:
580:
482:1.2 g/cm, ?
330:CompTox Dashboard
131:Interactive image
124:Interactive image
895:
835:
834:
832:
831:
816:
810:
800:
685:
595:organic compound
565:
559:
556:
555:
463:
448:
442:
436:
429:Chemical formula
354:
353:
338:
336:
320:
276:
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33:
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843:
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829:
827:
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813:
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792:
788:
773:plastic bottles
770:
766:
741:
730:
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722:
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714:
710:
706:
702:
692:
656:
631:
612:
608:
604:
600:
584:
577:
572:
571:
570: ?)
561:
557:
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549:
534:
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461:
451:
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431:
417:
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409:
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196:
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136:
116:
105:
92:
78:
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62:
60:
58:
50:
49:
21:
12:
11:
5:
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865:
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841:External links
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724:
720:
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708:
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691:
688:
687:
686:
655:
652:
636:esterification
630:
627:
610:
606:
602:
598:
582:
579:
578:
573:
551:
550:
546:standard state
543:
540:
539:
536:
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522:
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494:
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328:
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146:
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142:
141:Abbreviations
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137:
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127:
119:
117:
110:
107:
106:
104:
103:
95:
93:
88:
85:
84:
80:
79:
56:
52:
51:
47:
46:
40:
39:
35:
34:
13:
10:
9:
6:
4:
3:
2:
900:
889:
886:
884:
881:
879:
878:Methyl esters
876:
875:
873:
864:
861:
859:
856:
854:
851:
849:
845:
844:
840:
826:on 2017-10-07
825:
821:
815:
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799:
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795:
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783:
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776:
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762:
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754:
750:
746:
738:
736:
698:
697:
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689:
684:
680:
679:
678:
671:
667:
665:
661:
653:
651:
649:
647:
641:
637:
628:
626:
624:
620:
616:
596:
592:
588:
576:
569:
564:
547:
541:
537:
531:
527:
524:
523:
519:
513:
509:
506:
505:
501:
499:
498:Boiling point
496:
495:
491:
489:
488:Melting point
486:
485:
481:
479:
476:
475:
471:
468:
467:
460:
458:
455:
454:
433:
430:
426:
425:
420:
411:
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402:
395:
381:
371:
367:
360:
352:
348:
347:DTXSID0020498
344:
343:
341:
331:
327:
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319:
315:
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307:
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299:
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290:
280:
275:
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268:
264:
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261:
255:
251:
250:
246:
242:
240:
237:
236:
229:
228:
226:
224:
219:
218:
214:
210:
207:
205:
203:ECHA InfoCard
200:
199:
192:
188:
187:
185:
183:
180:
179:
172:
168:
167:
165:
163:
160:
159:
155:
152:
148:
147:
143:
140:
139:
132:
128:
125:
121:
120:
118:
114:
109:
108:
101:
97:
96:
94:
91:
87:
86:
81:
66:
53:
45:
41:
36:
32:
27:
19:
828:. Retrieved
824:the original
814:
777:
747:, including
742:
734:
693:
676:
663:
659:
657:
645:
632:
617:formed from
613:. It is the
590:
586:
585:
529:
511:
472:white solid
293:RTECS number
278:
171:CHEBI:156286
83:Identifiers
64:
55:Other names
755:(PTT), and
638:steps from
469:Appearance
422:Properties
209:100.004.011
872:Categories
830:2015-03-05
786:References
745:polyesters
629:Production
457:Molar mass
318:IKZ2470UNV
182:ChemSpider
111:3D model (
90:CAS Number
67:-phthalate
300:WZ1225000
230:204-411-8
222:EC Number
63:Dimethyl
648:-toluate
640:p-xylene
623:methanol
593:) is an
526:Basicity
274:12241382
191:13863300
156:1107185
100:120-61-6
761:benzene
751:(PET),
644:methyl
634:methyl-
615:diester
568:what is
566: (
508:Acidity
478:Density
462:194.186
277: (
254:PubChem
715:OH → C
650:(PT).
605:(COOCH
563:verify
560:
538:-6.60
520:-7.21
401:SMILES
38:Names
727:+ 2 H
711:+ 2CH
366:InChI
162:ChEBI
113:JSmol
739:Uses
642:via
621:and
309:UNII
267:8441
239:MeSH
144:DMT
804:doi
591:DMT
335:EPA
257:CID
874::
793:^
775:.
767:CH
721:10
717:10
535:)
528:(p
517:)
510:(p
444:10
438:10
833:.
806::
769:3
765:2
731:O
729:2
725:4
723:O
719:H
713:3
709:4
707:O
705:6
703:H
701:8
699:C
664:p
660:p
646:p
611:2
609:)
607:3
603:4
601:H
599:6
589:(
558:Y
533:b
530:K
515:a
512:K
450:4
447:O
441:H
435:C
337:)
333:(
284:)
282:4
279:H
115:)
65:p
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