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PETG Pellets: Dimethyl Terephthalate with Ethylene Glycol and CHDM
Charlie

Dicipta oleh

Charlie

19. Oktober 2026DE
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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.
Lanjutan
About 5 hours

Arahan

1

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.

Bahan untuk langkah ini:

Dimetil TereftalatDimetil Tereftalat10.669 kg
1,4-Sikloheksanadimetanol1,4-Sikloheksanadimetanol2.456 kg
Etilena glikolEtilena glikol4.058 kg

Alatan diperlukan:

Titanium IsopropoksidaTitanium Isopropoksida
n-Butanoln-Butanol
Neraca dua piringNeraca dua piring
Reaktor pempolimeran berjaketReaktor pempolimeran berjaket
Alat penyuling berperingkatAlat penyuling berperingkat
Gogal Percikan KimiaGogal Percikan Kimia
2

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.

Alatan diperlukan:

Reaktor pempolimeran berjaketReaktor pempolimeran berjaket
Alat penyuling berperingkatAlat penyuling berperingkat
Termogandingan dengan paparanTermogandingan dengan paparan
3

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.

Alatan diperlukan:

Reaktor pempolimeran berjaketReaktor pempolimeran berjaket
Termogandingan dengan paparanTermogandingan dengan paparan
Neraca dua piringNeraca dua piring
4

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.

Alatan diperlukan:

Reaktor pempolimeran berjaketReaktor pempolimeran berjaket
Pam vakumPam vakum
Tolok vakumTolok vakum
Perangkap SejukPerangkap Sejuk
5

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 %).

Alatan diperlukan:

Silinder Gas NitrogenSilinder Gas Nitrogen
PemeletPemelet
Sarung Tangan Tahan HabaSarung Tangan Tahan Haba

Bahan

3

Alatan Diperlukan

13

CC0 Domain Awam

Blueprint ini dikeluarkan di bawah CC0. Anda bebas menyalin, mengubah, mengedar, dan menggunakan karya ini untuk sebarang tujuan, tanpa meminta kebenaran.

Sokong Pembuat dengan membeli produk melalui Blueprint mereka di mana mereka memperoleh Komisen Pembuat ditetapkan oleh Penjual, atau cipta iterasi baru Blueprint ini dan sertakan ia sebagai sambungan dalam Blueprint anda sendiri untuk berkongsi hasil.

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