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

Yaremwe na

Charlie

19. Ukwakira 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.
Hejuru
About 4 days

Amabwiriza

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.

Ibikoresho by'iyi ntambwe:

Aside tereftalikiAside tereftaliki50 g
Etilene glikoliEtilene glikoli89 g

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
Icupa rifite igituza kizengurutseIcupa rifite igituza kizengurutse
Umuzingo w'ikondanseriUmuzingo w'ikondanseri
Urubaho rushyushyaUrubaho rushyushya
2

Wash and dry the ester

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

Ibikoresho bikenewe:

Amazi YatunganyijweAmazi Yatunganyijwe
Akayunguruzo k'Ikirahure Gafite UmugoziAkayunguruzo k'Ikirahure Gafite Umugozi
Urupapuro rwo KuyungururaUrupapuro rwo Kuyungurura
Pompe ikuramo umwukaPompe ikuramo umwuka
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.

Ibikoresho bikenewe:

Icupa rifite igituza kizengurutseIcupa rifite igituza kizengurutse
Urubaho rushyushyaUrubaho rushyushya
Termokupuli ifite igaragazaTermokupuli ifite igaragaza
Silinderi ya azoteSilinderi ya azote
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
Amadarubindi yo Kwirinda IbinyabutabireAmadarubindi yo Kwirinda Ibinyabutabire
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.

Ibikoresho bikenewe:

Akati k'Ikirahure ko KuvangaAkati k'Ikirahure ko Kuvanga
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
5

Extrude and cut into chips

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

Ibikoresho bikenewe:

Imashini isohora pulasitikiImashini isohora pulasitiki
Imashini ikata utubutoImashini ikata utubuto
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe

Ibikoresho

2

Ibikoresho bikenewe

15

Iki gishushanyo gikora

Thumbnail
Agateganyo

Utubuye twa resine ya PET

Free

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Blueprint zijyanye

Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame

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

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

na CharlieDE

By'Inganda

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