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Co-production method and device for 3, 3, 3-trifluoropropene and 2-chloro-3, 3, 3-trifluoropropene

A technology of trifluoropropene and liquid chlorine, applied in chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc., can solve the problems of many reaction steps, slow reaction rate, low product quality, etc., and achieve the effect of efficient separation

Active Publication Date: 2021-03-23
新元化学(山东)股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although some reports on the preparation of 3,3,3-trifluoropropene or 2-chloro-3,3,3-trifluoropropene have been published, there are no reports on the co-production of 3,3,3-trifluoropropene Compared with the public reports of 2-chloro-3,3,3-trifluoropropene, what is more important is that the above-mentioned methods have different degrees of difficulties such as separation difficulties, catalysts that cannot be regenerated, poor reaction atom economy, low yields, and reaction steps. Many problems, complex reaction system, slow reaction rate, long reaction time, harsh high-pressure reaction conditions, low product quality, and difficulty in realizing industrialized continuous large-scale production, etc.

Method used

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  • Co-production method and device for 3, 3, 3-trifluoropropene and 2-chloro-3, 3, 3-trifluoropropene
  • Co-production method and device for 3, 3, 3-trifluoropropene and 2-chloro-3, 3, 3-trifluoropropene
  • Co-production method and device for 3, 3, 3-trifluoropropene and 2-chloro-3, 3, 3-trifluoropropene

Examples

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Effect test

Embodiment 1

[0074] A co-production device for 3,3,3-trifluoropropene and 2-chloro-3,3,3-trifluoropropene, which includes a reaction system, a rectification pre-separation system, and an azeotrope-like extraction and separation system part;

[0075] The reaction system comprises hydrogen fluoride metering tank 1, liquid chlorine metering tank 2, tetrachloropropane metering tank 3, hydrogen fluoride metering pump 4, liquid chlorine metering pump 5, tetrachloropropane metering pump 6, hydrogen fluoride vaporizer 7, liquid chlorine vaporizer 8 , tetrachloropropane preheater 9, premixer 10, reactor 11, reaction cooler 12, described hydrogen fluoride metering tank 1 is communicated with hydrogen fluoride vaporizer 7 bottom feeding ports through hydrogen fluoride metering pump 4, hydrogen fluoride vaporizer 7 top outlets The feed port is connected to the gas phase feed port at the top of the premixer 10, the liquid chlorine metering tank 2 is connected to the feed port at the bottom of the liqui...

Embodiment 2

[0080] A co-production device for 3,3,3-trifluoropropene and 2-chloro-3,3,3-trifluoropropene as described in Example 1, the difference is: the fixed bed reactor with tubes 11. The lower head is provided with a jacket, and heat transfer oil is introduced into the jacket for heating to ensure that the feed temperature is further increased to the reaction temperature. The rectification II tower condenser 16 is cooled by -30°C to -35°C frozen brine, Further strengthen the cooling effect of other materials except hydrogen chloride, reduce material loss, and increase yield. The jacket of the phase separation condenser 21 is cooled by frozen brine with a temperature of -30°C to -35°C. The phase separator 20 The jacket is cooled by frozen brine with a temperature of -30°C to -35°C, and the upper part of the 3,3,3-trifluoropropene alkali washing tower 33 is connected with an alkali liquid input pipeline, and the 2-chloro- The middle and lower part of the 3,3,3-trifluoropropene alkali w...

Embodiment 3

[0082] Utilize the method for the coproduction of 3,3,3-trifluoropropene and 2-chloro-3,3,3-trifluoropropene by the production device described in embodiment 1 or 2, the fluorination catalyst used in the embodiment is chromium series Fluorination catalyst, comprising steps as follows:

[0083] (1) Reaction process

[0084] a) Hydrogen fluoride is pumped to hydrogen fluoride vaporizer 7 by hydrogen fluoride metering tank 1 to preheat, b) Liquid chlorine is pumped to liquid chlorine vaporizer 8 by liquid chlorine metering tank 2 to preheat, c) 1,1 is pumped by tetrachloropropane metering tank 3 , 1,3-tetrachloropropane is pumped to the tetrachloropropane preheater 9 for preheating, and the materials preheated in steps a), b), and c) are simultaneously fed into the falling film evaporation premixer 10 continuously, and the falling film evaporation premixer 10 is The temperature inside the mixer 10 is 240-300°C, the working pressure is 1.0-1.3MPa, the molar ratio of chlorine gas ...

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Abstract

The invention relates to a co-production method and device for 3, 3, 3-trifluoropropene and 2-chloro-3, 3, 3-trifluoropropene. The device used in the method comprises a reaction system, a rectification pre-separation system and an azeotrope-like substance extraction separation system. The raw material premixer adopts a falling film evaporation premixer, so that the liquid materials 1, 1, 1, 3-tetrachloropropane are promoted to be quickly and fully vaporized, and meanwhile, the mixing effect of each gas-phase material is enhanced. The rectification pre-separation system adopts a three-tower continuous rectification mode to realize efficient separation of reaction by-products hydrogen chloride, high-boiling residues and excessive hydrogen fluoride. And the azeotrope-like substance extractionand separation system is used for realizing liquid-liquid two-phase extraction and separation of azeotrope-like substances. The production method provided by the invention is realized through the production device with the specific structure and connection relationship, has the advantages of mild reaction conditions, high reaction rate, good atom economy, stable product quality, adjustable product proportion and the like, can realize full-flow automatic control, saves labor, and is suitable for industrial co-production of 3, 3, 3-trifluoropropene and 2-chloro-3, 3, 3-tetrafluoropropene.

Description

technical field [0001] The present invention relates to a preparation method and device for fluorine-containing olefins and fluorine-containing chloroolefins, in particular to a co-production method and device for 3,3,3-trifluoropropene and 2-chloro-3,3,3-trifluoropropene . Background technique [0002] 3,3,3-Trifluoropropene is the basic raw material for the synthesis of 2-bromo-3,3,3-trifluoropropene (BTP), fluorosilicone rubber and other high value-added organic compounds. Among them, 2-bromo-3,3,3-trifluoropropene is a degradable bromocarbon, which is a new type of clean and efficient fire extinguishing agent, and its ozone depletion potential (0.0028) and global warming potential (0.005) are both far lower Yuhalon series fire extinguishing agents (7.1 and 1890) are easy to degrade in the environment. When used as fire extinguishing agents, they have the advantages of rapid fire extinguishing, cleanness, high efficiency, and non-conductivity. They are replacements for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/20C07C21/18C07C17/25C07C17/04C07C19/10C07C21/04C07C17/38C07C17/383
CPCC07C17/04C07C17/20C07C17/25C07C17/38C07C17/383C07C21/18C07C19/10C07C21/04
Inventor 解乐福邵军强丛飞田志钢杜辉周建民李成林
Owner 新元化学(山东)股份有限公司
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