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

Imeundwa na

Charlie

19. Oktoba 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.
Juu
Continuous

Maagizo

1

Make the suspension

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

Vifaa kwa hatua hii:

Asidi ya tereftalikiAsidi ya tereftaliki1000 g
MethanoliMethanoli1000 ml

Zana zinazohitajika:

Asidi ya fosforiki (85 %)Asidi ya fosforiki (85 %)
Mizani ya mizani-mbiliMizani ya mizani-mbili
Silinda yenye vipimoSilinda yenye vipimo
Miwani ya kinga dhidi ya kemikaliMiwani ya kinga dhidi ya kemikali
Glavu za mpiraGlavu za mpira
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.

Zana zinazohitajika:

Bomba la mmenyuko lenye jotoBomba la mmenyuko lenye joto
Themokapo yenye kionyeshiThemokapo yenye kionyeshi
Koili ya kifidishajiKoili ya kifidishaji
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.

Zana zinazohitajika:

Pua ya kunyunyizia ya atomaizaPua ya kunyunyizia ya atomaiza
Silinda ya gesi ya naitrojeniSilinda ya gesi ya naitrojeni
Bomba la mmenyuko lenye jotoBomba la mmenyuko lenye joto
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
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 %.

Zana zinazohitajika:

Koili ya kifidishajiKoili ya kifidishaji
Glavu za mpiraGlavu za mpira
5

Recycle nitrogen and methanol

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

Zana zinazohitajika:

Pampu ya diaphragmPampu ya diaphragm
Silinda ya gesi ya naitrojeniSilinda ya gesi ya naitrojeni

Vifaa

2

Zana Zinazohitajika

12

Mchoro huu unatengeneza

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Phosphoric Acid from Burned Phosphorus: the Thermal Process
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Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.

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