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Hexafluoropropylene dimmer production method

A technology of hexafluoropropylene dimer and hexafluoropropylene, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., and achieves the effects of mild reaction conditions, high conversion rate and low dosage

Inactive Publication Date: 2006-12-13
浙江莹光化工有限公司
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  • Abstract
  • Description
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Problems solved by technology

The disadvantage is that the dimer content of hexafluoropropylene in the crude product is only 4-5%, and a large amount of it is trimer

Method used

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  • Hexafluoropropylene dimmer production method

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Embodiment 1

[0015] Embodiment 1, reaction vessel internal diameter 50mm, long 250mm stainless steel, with feed inlet and temperature measuring device, pack 5 grams of potassium thiocyanate, put on the flange cover, vacuumize, inhale 120 gram of acetonitrile, inhale 242 gram Hexafluoropropylene, close the valve on the feed inlet, and be fixed on the slide plate (3) of the crank connecting rod swing device. Start the swinging device at room temperature, the swinging frequency is 2 times per second, and the swinging distance is 100mm, react for 7 hours, and let it stand overnight to obtain 210 grams of the bottom crude product and 132 grams of the upper acetonitrile layer. Distill the crude product in a three-necked flask to collect fractions at 30-40°C to obtain 183 grams of the product. Analyzed by gas chromatography, it contains 97.07% of hexafluoropropylene dimer, and the yield is 73.40%. The acetonitrile layer was distilled in a three-necked flask to obtain 115 grams of acetonitrile, wh...

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Abstract

The invention relates the preparing method of hexafluoropropylene dipolymer, using hexafluoropropylene as raw material, acetonitrile as solvent, and kalium rhodanatum as accelerating agent. The invention provides the reaction device of preparing hexafluoropropylene dipolymer. The device is driven by crank connecting rod to alternating motion.

Description

1. Technical field [0001] The invention relates to the field of organic chemical industry, in particular to a method for preparing hexafluoropropylene dimer. 2. Technical background [0002] In the prior art, a kind of preparation method of hexafluoropropylene dimer is to use hexafluoropropylene to obtain by gas-phase catalytic polymerization, such a preparation method is described in US4,377,717 patent, with active carbon as catalyst, in 410 Feed hexafluoropropylene at ~420°C, the residence time is 13 seconds, the yield is only 29.6%, the selectivity is only 64.5%, and because of the high temperature, the catalyst life is very short at such a high temperature. [0003] In the US 5,387,728 patent, a method for preparing hexafluoropropylene dimer is introduced, using an aprotic polar solvent such as acetonitrile as a solvent, and using an amine compound such as N, N, N', N'-tetramethylethylene di Amine and fluoride, such as potassium fluoride, are used as catalysts and react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/281C07C21/18
Inventor 徐金和陈志军张巍彪舒军宾
Owner 浙江莹光化工有限公司
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