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

Nilikha ni

Charlie

19. Oktubre 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.
Abantado
Continuous

Mga Tagubilin

1

Make the suspension

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

Mga materyales para sa hakbang na ito:

Terephthalic AcidTerephthalic Acid1000 g
MethanolMethanol1000 ml

Mga kailangang kasangkapan:

Phosphoric acid (85 %)Phosphoric acid (85 %)
Timbangang panimbangTimbangang panimbang
Silindrong may sukatanSilindrong may sukatan
Salamin Laban sa Tilamsik ng KemikalSalamin Laban sa Tilamsik ng Kemikal
Gwantes na gomaGwantes na goma
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.

Mga kailangang kasangkapan:

Pinainit na reaction tubePinainit na reaction tube
Thermocouple na may basahanThermocouple na may basahan
Ikid ng kondensadorIkid ng kondensador
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.

Mga kailangang kasangkapan:

Atomising spray nozzleAtomising spray nozzle
Silindro ng NitrogenSilindro ng Nitrogen
Pinainit na reaction tubePinainit na reaction tube
Guwantes na Matibay sa InitGuwantes na Matibay sa Init
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 %.

Mga kailangang kasangkapan:

Ikid ng kondensadorIkid ng kondensador
Gwantes na gomaGwantes na goma
5

Recycle nitrogen and methanol

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

Mga kailangang kasangkapan:

Diaphragm pumpDiaphragm pump
Silindro ng NitrogenSilindro ng Nitrogen

Mga Materyales

2

Mga Kinakailangang Kasangkapan

12

Ang blueprint na ito ay gumagawa ng

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Dimethyl terephthalate

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Kaugnay na Blueprint

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CC0 Pampublikong Domain

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