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A method for mixed vaporization of hydrogen fluoride and chlorinated hydrocarbons

A technology of chlorinated hydrocarbons and hydrogen fluoride, which is applied in chemical instruments and methods, preparation of halogenated hydrocarbons, dehydrohalogenation preparation, etc., can solve problems such as inability to realize effective vaporization of TCP, difficulty in mixing, and deactivation of catalyst carbon deposition, and achieve effective Conducive to rapid and effective vaporization, enhanced mass transfer and heat transfer, and rapid and effective vaporization

Active Publication Date: 2021-07-27
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TCP is a high-boiling point (boiling point is 167°C) and heat-sensitive substance. Long-term high-temperature treatment will lead to coking and polymerization of TCP. Conventional vaporization methods not only cannot achieve effective vaporization of TCP, but also easily cause coking and carbonization of TCP, block pipelines, and accelerate catalysts. Carbon Deactivation
In addition, chlorinated hydrocarbons are organic substances of medium or weak polarity, while hydrogen fluoride is a highly polar inorganic substance, and it is difficult to mix them.

Method used

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  • A method for mixed vaporization of hydrogen fluoride and chlorinated hydrocarbons
  • A method for mixed vaporization of hydrogen fluoride and chlorinated hydrocarbons
  • A method for mixed vaporization of hydrogen fluoride and chlorinated hydrocarbons

Examples

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Effect test

Embodiment 1

[0022] Take the vaporization process in the synthesis of HCFO-1233xf by gas-phase fluorination of 1,1,2,3-tetrachloropropene (TCP) as an example. This reaction requires the temperature of the material entering the reactor to be 260°C and the pressure to be 1.0MPA.

[0023] The static mixer 3 is a SK type static mixer, the shell, flange and mixing unit are all made of SUS304, the diameter of the equipment is 80mm, and the total length of the equipment is 500mm; the vaporizer 4 is a Venturi tube, and the gas velocity of the material in the throat diameter section The diameter of the corresponding throat diameter section is 50mm, the length of the throat diameter section is 100mm, and the length of the expansion section is 500mm.

[0024] Liquid hydrogen fluoride is heated to 350°C by HF heater 1 and enters static mixer 3. Liquid TCP is preheated to 65°C by TCP preheater 2 and then enters static mixer 3. The molar ratio of hydrogen fluoride to TCP is 30:1. The mixture is mixed by...

Embodiment 2

[0028] Example 2 takes the vaporization process in the synthesis of trifluoropropene by gas phase fluorination of 1,1,1,3-tetrachloropropane as an example. This reaction requires the temperature of the material entering the reactor to be 200°C and the pressure to be 0.5MPA.

[0029] The static mixer 3 is a SV-type static mixer, the shell, flange, and mixing unit are all made of SUS304, the diameter of the equipment is 60mm, and the total length of the equipment is 500mm; the vaporizer 4 is a Venturi tube, and the gas velocity of the material in the throat diameter section The diameter of the corresponding throat diameter section is 45mm, the length of the throat diameter section is 180mm, and the length of the expansion section is 1500mm.

[0030] Liquid hydrogen fluoride enters static mixer 3 after being heated to 220°C by HF heater 1, liquid 1,1,1,3-tetrachloropropane enters static mixer 3 after being preheated to 100°C by TCP preheater 2, hydrogen fluoride and The molar rat...

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Abstract

The invention discloses a method for mixing and vaporizing hydrogen fluoride and chlorinated hydrocarbons. The method comprises the following steps: (1) heating the hydrogen fluoride to 200-400°C and then entering a static mixer, and preheating the chlorinated hydrocarbons to 50-100°C After entering the static mixer, the molar ratio of hydrogen fluoride to chlorinated hydrocarbon is 20:1-100:1; (2) The material at the outlet of the static mixer enters the vaporizer for vaporization. The invention adopts the process of vaporizing liquid chlorinated hydrocarbons with excessive high-temperature hydrogen fluoride, and the combined vaporization equipment of static mixer and Venturi tube vaporizer to realize the vaporization of high boiling point and heat-sensitive chlorinated hydrocarbons.

Description

technical field [0001] The invention relates to a method for mixed vaporization of hydrogen fluoride and chlorinated hydrocarbons, which is mainly used in the field of synthesis of hydrofluorocarbons and hydrofluoroalkenes, especially for realizing the mixed vaporization of hydrogen fluoride and chlorinated hydrocarbons in gas phase fluorination reactions. Background technique [0002] The gas-phase fluorination reaction of hydrogen fluoride and chlorinated hydrocarbons is an important method for the preparation of fluorinated compounds, especially in the synthesis of hydrofluorocarbons and hydrofluoroolefins. The gas-phase fluorination reaction is generally in the presence of a solid catalyst, and the raw material hydrogen fluoride and chlorinated hydrocarbons are reacted through the catalyst bed in the form of gas, that is, the reaction process needs to vaporize the liquid hydrogen fluoride and chlorinated hydrocarbons and heat them up to the reaction temperature. reactor....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/20C07C17/25C07C21/18
CPCC07C17/206C07C17/25C07C21/18
Inventor 曾纪珺吕剑韩升张伟郝志军赵波唐晓博杨志强李凤仙
Owner XIAN MODERN CHEM RES INST
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