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PETG Pellets: Dimethyl Terephthalate with Ethylene Glycol and CHDM
PETG is PET in which part of the ethylene glycol is replaced by CHDM, which keeps the plastic clear and amorphous. Eastman's patent US 7,026,027 describes PETG 6763 as terephthalate with about 69 mol % ethylene glycol and 31 mol % CHDM, but gives no recipe for it. This blueprint is our own combination: that composition, made by the same patent's pilot-plant process (Example 12, written for a CHDM/neopentyl glycol copolyester), with ethylene glycol in place of neopentyl glycol as in Kibler's 1959 Eastman patent. The charge weights are our arithmetic.
The picture: our diagram.
Ilọsíwájú
About 5 hours
Ìlànà
1
1
Charge the reactor
Charge the reactor
Our charge for 31 mol % CHDM: 10.669 kg dimethyl terephthalate (54.9 mol, as in the patent's example), 2.456 kg CHDM (31 % of those moles) and 4.058 kg ethylene glycol, so the glycols total 1.5 times the ester moles as in the example. Add 53.4 g of catalyst solution (15 g titanium isopropoxide in 250 ml n-butanol). The patent's reactor held 18 gallons and had spiral agitators and a distillation column.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Dimethyl terephthalate10.669 kg
1,4-Cyclohexanedimethanol2.456 kg
Ethylene glycol4.058 kgÀwọn irinṣẹ́ tí a nílò:
Titanium isopropoxide
n-Butanol
Òǹwọ̀n ìdọ́gba
Ìkòkò ìṣe polymer oníbora
Ohun ìsun tí ó pín
Gílásì Ààbò Fún Ìfọ́n Kẹ́míkà2
2
Ester interchange at 200 °C
Ester interchange at 200 °C
Stir (forward 50 minutes, then reverse 10), heat to 200 °C and hold 2 hours. Methanol distils off through the column.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣe polymer oníboraOhun ìsun tí ó pín
Thermocouple pẹ̀lú ìkà3
3
260 °C, then 280 °C
260 °C, then 280 °C
Raise to 260 °C for 30 minutes and weigh the distillate, then raise to 280 °C and weigh it again. The surplus ethylene glycol is driven off; Kibler found the CHDM stays in the polymer.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣe polymer oníboraThermocouple pẹ̀lú ìkàÒǹwọ̀n ìdọ́gba4
4
Polymerise under vacuum
Polymerise under vacuum
Switch the agitator direction every 6 minutes and pull vacuum at 13 Torr a minute down to 0.5 Torr. Hold full vacuum for 45 minutes at 25 rpm.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣe polymer oníbora
Ẹ̀rọ ìfàfẹ́fẹ́jáde
Ẹ̀rọ ìwọ̀n àìsí afẹ́fẹ́
Ìdẹkùn òtútù5
5
Extrude and chop into pellets
Extrude and chop into pellets
Let nitrogen in, extrude the polymer at once and chop it into pellets. Check the composition: in the patent's example the polymer kept slightly less CHDM than was charged (38.1 % for 40.7 %).
Àwọn irinṣẹ́ tí a nílò:
Sílíńdà Gáàsì Nàìtírójìn
Ẹ̀rọ Ìṣe Pẹ́lẹ́ẹ̀tì
Ìbọ̀wọ́ Tí Ń Fara Da OoruÀwọn ohun-èlò
3- 10.669 kgÀyè
- 2.456 kgÀyè
- 4.058 kgÀyè
Àwọn irinṣẹ́ tó nílò
13- Àyè
- 1 vendor sell this, none ship to you yetÀyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
Blueprint tó jọra
Àwọn blueprint wọ̀nyí pín ìmọ̀ — ọ̀nà, ohun-èlò tàbí ìlànà
Léwu
1,4-Cyclohexanedimethanol: Dimethyl Terephthalate Hydrogenated over Palladium, then Copper Chromite
láti ọwọ́ Charlie
Ti Ilé-iṣẹ́
13
0
0
0
0
0
Dimethyl Terephthalate: Terephthalic Acid and Methanol Sprayed through a Hot Tube
láti ọwọ́ Charlie
Ti Ilé-iṣẹ́
11
0
0
0
0
0
Léwu
Ethylene Glycol by Hydration of Ethylene Oxide
láti ọwọ́ Charlie
Ti Ilé-iṣẹ́
8
0
0
0
0
0
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