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Dimethyl Terephthalate: Terephthalic Acid and Methanol Sprayed through a Hot Tube
Charlie

Yaremwe na

Charlie

19. Ukwakira 2026DE
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Dimethyl Terephthalate: Terephthalic Acid and Methanol Sprayed through a Hot Tube

Dimethyl terephthalate (DMT) is the methyl ester of terephthalic acid, a raw material for polyesters. Terephthalic acid does not melt, so Lotz and Gerlach (US 2,876,252, 1959) spray it as a suspension in methanol, with a little phosphoric acid, into a tube heated to 280–300 °C. The ester condenses as long needles that melt at 141 °C; the patent's yield was 97 %. The picture: our diagram.
Hejuru
Continuous

Amabwiriza

1

Make the suspension

Stir 1000 g of finely powdered terephthalic acid and 60 cc of 85 % phosphoric acid into 1000 cc of methanol.

Ibikoresho by'iyi ntambwe:

Aside tereftalikiAside tereftaliki1000 g
MetanolMetanol1000 ml

Ibikoresho bikenewe:

Aside fosiforike (85 %)Aside fosiforike (85 %)
Umunzani w'ibiroUmunzani w'ibiro
Igipimo cy'ikirahure gifite imirongoIgipimo cy'ikirahure gifite imirongo
Amadarubindi yo Kwirinda IbinyabutabireAmadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
2

Heat the reaction tube

Heat a long cylindrical reaction tube electrically to 280–300 °C (the patent's was 300 cm long and 40 cm wide). A cooled condenser follows it.

Ibikoresho bikenewe:

Umuyoboro w'ubushyuhe wo gukoreramoUmuyoboro w'ubushyuhe wo gukoreramo
Termokupuli ifite igaragazaTermokupuli ifite igaragaza
Umuzingo w'ikondanseriUmuzingo w'ikondanseri
3

Spray it in with nitrogen

Spray the suspension with nitrogen through a nozzle into the tube, so the fine spray travels in a spiral along the tube wall. The acid and methanol react on the way.

Ibikoresho bikenewe:

Akanyuzo gatera ibitonyanga bitoAkanyuzo gatera ibitonyanga bito
Silinderi ya azoteSilinderi ya azote
Umuyoboro w'ubushyuhe wo gukoreramoUmuyoboro w'ubushyuhe wo gukoreramo
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
4

Collect the needles

The dimethyl terephthalate collects in the cooled condenser as long prismatic needles, melting point 141 °C. The patent's yield was 97 %.

Ibikoresho bikenewe:

Umuzingo w'ikondanseriUmuzingo w'ikondanseri
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
5

Recycle nitrogen and methanol

Draw the nitrogen and the excess methanol out with a membrane (diaphragm) pump and send them round again.

Ibikoresho bikenewe:

Pompe ya diyafaragimePompe ya diyafaragime
Silinderi ya azoteSilinderi ya azote

Ibikoresho

2

Ibikoresho bikenewe

12

Iki gishushanyo gikora

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Agateganyo

Dimethyl terephthalate

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