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PET Resin: Terephthalic Acid and Ethylene Glycol, Whinfield and Dickson
Charlie

Imeundwa na

Charlie

19. Oktoba 2026DE
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PET Resin: Terephthalic Acid and Ethylene Glycol, Whinfield and Dickson

PET (polyethylene terephthalate) was invented by Whinfield and Dickson, whose patent (US 2,465,319, 1949) gives this first example: boil terephthalic acid in ethylene glycol until it dissolves, wash and dry the glycol ester, then heat it at 280 °C under nitrogen until it is a viscous polymer that melts at 254–255 °C and can be drawn into fibre. The melt is extruded and cut into chips (pellets) for moulding and spinning. The picture: our diagram.
Juu
About 4 days

Maagizo

1

Boil the acid in glycol

Reflux 50 g terephthalic acid with 89 g ethylene glycol for about 72 hours, until it has all dissolved. This makes glycol terephthalate.

Vifaa kwa hatua hii:

Asidi ya tereftalikiAsidi ya tereftaliki50 g
Ethilini glikoliEthilini glikoli89 g

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Chupa yenye chini cha mviringoChupa yenye chini cha mviringo
Koili ya kifidishajiKoili ya kifidishaji
Sahani ya Kupasha JotoSahani ya Kupasha Joto
2

Wash and dry the ester

Wash the glycol terephthalate with water and dry it under vacuum.

Zana zinazohitajika:

Maji yaliyosafishwa kwa mvukeMaji yaliyosafishwa kwa mvuke
Faneli ya Kioo Yenye BombaFaneli ya Kioo Yenye Bomba
Karatasi ya KuchujaKaratasi ya Kuchuja
Pampu ya utupuPampu ya utupu
3

Heat at 280 °C under nitrogen

Melt it and heat at 280 °C for 8½ hours in a slow stream of nitrogen: no air may reach it. It grows thick as it polymerises.

Zana zinazohitajika:

Chupa yenye chini cha mviringoChupa yenye chini cha mviringo
Sahani ya Kupasha JotoSahani ya Kupasha Joto
Themokapo yenye kionyeshiThemokapo yenye kionyeshi
Silinda ya gesi ya naitrojeniSilinda ya gesi ya naitrojeni
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
Miwani ya kinga dhidi ya kemikaliMiwani ya kinga dhidi ya kemikali
4

Test for cold-drawing

Pull a thread from the melt with a rod and let it cool. It is ready when the cold thread can be stretched to several times its length. The finished polymer melts at 254–255 °C.

Zana zinazohitajika:

Fimbo ya Kioo ya KukorogaFimbo ya Kioo ya Kukoroga
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
5

Extrude and cut into chips

Extrude the molten polymer, let it cool, and cut it into chips (pellets).

Zana zinazohitajika:

Kitoaji cha plastikiKitoaji cha plastiki
Kitengeneza chembeKitengeneza chembe
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto

Vifaa

2

Zana Zinazohitajika

15

Mchoro huu unatengeneza

Thumbnail
Kishikilia nafasi

Chembechembe za resini ya PET

Free

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Terephthalic Acid: Para-Xylene Oxidised by Air with Manganese and Bromide

Terephthalic Acid: Para-Xylene Oxidised by Air with Manganese and Bromide

na CharlieDE

Viwandani

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CC0 Umma Wote

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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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