SU425467A1 - The method of obtaining -difluoroacrylonitrile - Google Patents

The method of obtaining -difluoroacrylonitrile

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Publication number
SU425467A1
SU425467A1 SU1675811A SU1675811A SU425467A1 SU 425467 A1 SU425467 A1 SU 425467A1 SU 1675811 A SU1675811 A SU 1675811A SU 1675811 A SU1675811 A SU 1675811A SU 425467 A1 SU425467 A1 SU 425467A1
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SU
USSR - Soviet Union
Prior art keywords
difluoroacrylonitrile
conversion
obtaining
freon
acrylonitrile
Prior art date
Application number
SU1675811A
Other languages
Russian (ru)
Inventor
С.Ф. Политанский
В.У. Шевчук
Т.И. Политанская
Г.Д. Иванык
И.М. Гутор
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Priority to SU1675811A priority Critical patent/SU425467A1/en
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Publication of SU425467A1 publication Critical patent/SU425467A1/en

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Description

1one

Изобретение относитс  к способам получени  р, |3 - дифторакрилопитрила - денного мономера дл  получени  фторсодержащих полимеров и сополимеров.The invention relates to methods for producing p, | 3 - difluoroacrylopitrile - monomer for the preparation of fluorine - containing polymers and copolymers.

Известен способ получени  р,р-дифторакрилонитрила , по которому смесь тетрафторзтилена и акрилонитрила подвергают пиролизу при 680-730° С. Выход целевого продукта составл ет 19-26% при конверсии исходных олефинов около 10%. Однако исходные реагенты - тетрафторэтилен и акрилонитрил ,-которые широко используют в производстве полимерных материалов, дефицитны, а та:кже конверси  указанных мономеров в процессе пиролиза низка.A method of producing p, p-difluoroacrylonitrile is known, in which a mixture of tetrafluoroethylene and acrylonitrile is subjected to pyrolysis at 680-730 ° C. The yield of the desired product is 19-26% with a conversion of the starting olefins about 10%. However, the initial reagents - tetrafluoroethylene and acrylonitrile, which are widely used in the production of polymeric materials, are scarce, and that: the conversion of the indicated monomers is also low during the pyrolysis process.

Цель изобретени  - повышение конверсии исходных веш,еств и расширение сырьевой базы.The purpose of the invention is to increase the conversion of raw materials and expand the resource base.

Дл  достижени  этой цели предлагаетс  ацетонитрил подвергать взаимодействию с дифтордихлорметаном (,фреоном-12) при 600-1000° С. Выделение целевого продукта из реакционной смеси и его очистку осуществл ют известными приемами, например ректификацией .To achieve this goal, acetonitrile is proposed to be reacted with difluorodichloromethane (, freon-12) at 600-1000 ° C. The selection of the target product from the reaction mixture and its purification are carried out using known methods, for example, by distillation.

Процесс предпочтительно осуществл ть при давлении 0,1-2 ати, мол рном соотнощеН .ИИ акрилонитрил:дифтордихлорметан 0,1-10 и времени удерж1ивани  веществ в зоне реакции 0,01 - 1 сек.The process is preferably carried out at a pressure of 0.1-2 MPa, a molar ratio of Acrylonitrile: difluorodichloromethane 0.1-10 and a retention time of substances in the reaction zone of 0.01-1 sec.

Предлагаемый способ поз1вол ет получать 5,р-дифторакрилонитрил с выходом 30-35% из легкодоступного сырь  - ацетонитрила - побочного продукта в производстве акрилонитр .ила и фреона-12, который  вл етс  одним из наиболее дешевых фторорганических соединений. Конверси  исходного сырь  в целевой продукт составл ет 30-40%.The proposed method allows to obtain 5, p-difluoroacrylonitrile with a yield of 30-35% from readily available raw material, acetonitrile, a by-product in the production of acrylonitroyl and freon-12, which is one of the cheapest organofluorine compounds. The conversion of the feedstock into the desired product is 30-40%.

Пример. Через кварцевую трубку диаметром 26 мм с длиной обогреваемой зоны, равной 120 мм, пропускают при 800° С со скоростью 73 л/час смесь фреона-12 и акрилонитрила в эквимол рном соотношении в течение 6 час. Получают 1350 г сырого продукта, содержащего 8,8% р,р-дифторакрилонитрила и 52% исходного фреона. Ректификацией выдел ют (3,|3-дифторакрилон1итрил с чистотой более 99%, выход 34%, счита  на превращенный фреон-12, конверси  фреона-12 33%, р,|3-дифтора:крилонитрил килит при 66,3 - 67,5° С п25 ,3463.Example. A mixture of freon-12 and acrylonitrile in an equimolar ratio for 6 hours is passed through a quartz tube with a diameter of 26 mm and a length of the heated zone of 120 mm at a speed of 73 l / h. 1350 g of crude product are obtained, containing 8.8% p, p-difluoroacrylonitrile and 52% of the original freon. The distillation isolated (3, | 3-difluoroacrylon1itrile with a purity of more than 99%, yield 34%, calculated for converted freon-12, conversion of freon-12 33%, p, | 3-difluoro: krilonitrile kilit at 66.3 - 67, 5 ° C p25, 3463.

Claims (1)

Формула изобретени Invention Formula II Способ получени  р,р-дифторакр«лонитрила , о тл и ч а ющ и йс  тем, что, с целью повышени  конверсии исходных веществ и расширени  сырьевой базы, ацетонитрил подвер3The method of obtaining p, p-difluorocr "lonitrile, about t and ch and y with the fact that, in order to increase the conversion of the starting materials and expand the raw material base, acetonitrile is subject to гают взаимодействию с дифтордихлормета- нием целевого продукта известными приеманом при 600-1000° С с последующим выделе-ми.They are supposed to interact with the difluorodichlormethation of the target product with known principles at 600–1000 ° С followed by excreta. 425467 425467
SU1675811A 1971-06-21 1971-06-21 The method of obtaining -difluoroacrylonitrile SU425467A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU1675811A SU425467A1 (en) 1971-06-21 1971-06-21 The method of obtaining -difluoroacrylonitrile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU1675811A SU425467A1 (en) 1971-06-21 1971-06-21 The method of obtaining -difluoroacrylonitrile

Publications (1)

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SU425467A1 true SU425467A1 (en) 1976-03-05

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