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Dodecafluoroheptanol: Tetrafluoroethylene Joined to Methanol (Joyce 1951)
Charlie

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Charlie

28. Ukwakira 2026DE
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Dodecafluoroheptanol: Tetrafluoroethylene Joined to Methanol (Joyce 1951)

Heated with methanol and a little peroxide, tetrafluoroethylene adds on to the methanol in short chains: H(CF2CF2)nCH2OH, with n from 1 to 12. Steam carries off the short ones; distilling the liquid part sorts them by boiling point. The cut at 169–170 °C, three units long, is the start of a fluorine soap used to make PTFE dispersions. Source: R. M. Joyce (du Pont), US 2,559,628 (1951), Example IV. The steam-distillation and fractionating apparatus is ours. Picture drawn by Youblob.
Hejuru
2 days

Amabwiriza

1

Charge the reactor

Put 150 parts of methanol and 2 parts of tert-butyl octyl peroxide in a high-pressure reactor. Close it, cool it, and let in 110 parts of tetrafluoroethylene through a valve. Parts are by weight.

Ibikoresho by'iyi ntambwe:

MetanolMetanol150 parts
TetrafluworoethileniTetrafluworoethileni110 parts

Ibikoresho bikenewe:

tert-Butili okitili perokisidetert-Butili okitili perokiside
Reyakitori y'igitutuReyakitori y'igitutu
Ibariro rya gazi ifite igitutuIbariro rya gazi ifite igitutu
Umunzani w'ibiroUmunzani w'ibiro
2

Heat at 170 °C for 10 hours

Agitate and heat at 170 °C for 10 hours. The pressure rises on its own to about 90 atmospheres.

Ibikoresho bikenewe:

Reyakitori y'igitutuReyakitori y'igitutu
Igipima UmuvudukoIgipima Umuvuduko
Igipima UbushyuheIgipima Ubushyuhe
3

Steam-distil the product

Steam-distil the product. What comes over is part liquid and part solid; separate the two. Ours: steam from a boiler through the flask, a condenser, and a separatory funnel for the liquid.

Ibikoresho bikenewe:

Inkono itanga umwuka w'amaziInkono itanga umwuka w'amazi
Icupa ry'ikirahure ryo kuyungururaIcupa ry'ikirahure ryo kuyungurura
Umuzingo w'ikondanseriUmuzingo w'ikondanseri
Igifuniko gitandukanyaIgifuniko gitandukanya
4

Fractionate; keep the 169–170 °C cut

Fractionally distil the liquid part. It separates into the series H(CF2CF2)nCH2OH; collect the fraction boiling at 169–170 °C, where n = 3 (dodecafluoroheptanol). The patent gives no yield for this cut.

Ibikoresho bikenewe:

Ikinyuza umwuka gitandukanyaIkinyuza umwuka gitandukanya
Igipima UbushyuheIgipima Ubushyuhe
Icupa ry'Ikirahure Rifite UmufunikoIcupa ry'Ikirahure Rifite Umufuniko

Ibikoresho

2

Ibikoresho bikenewe

12

Iki gishushanyo gikora

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Agateganyo

Dodekafluworoheputanoli

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