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Preparation method for 1-chlorine-1,1-difluoroethane

A technology for difluoroethane and acetylene, which is applied in the field of preparing 1-chloro-1 from acetylene, can solve the problems of high production cost, many by-products, increased cost, etc., and achieves small footprint, less by-products, and material back-mixing. less effect

Active Publication Date: 2013-06-26
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] In actual production at present, the main synthetic route of 1-chloro-1,1-difluoroethane (HCFC-142b) is to use vinylidene chloride or 1,1,1-trichloroethane as the reaction raw material, because vinylidene chloride Or 1,1,1-trichloroethane has been at a higher price level, resulting in higher production costs of 1-chloro-1,1-difluoroethane, and there are many by-products in the existing synthetic process route, resulting in 1 - The purity of chloro-1,1-difluoroethane is low, and the subsequent separation further increases the cost

Method used

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  • Preparation method for 1-chlorine-1,1-difluoroethane
  • Preparation method for 1-chlorine-1,1-difluoroethane

Examples

Experimental program
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Effect test

Embodiment 1

[0051] The acetylene gas and HF gas enter the vaporizer to be vaporized according to the volume ratio of 1:6, then enter the preheating device, and then pass into the fixed bed reactor, under the action of catalyst I, the mixture of chromium chloride, palladium chloride and activated carbon (the quality of chromium chloride is 15% of the total mass of catalyst 1, palladium chloride is 4% of the total mass of catalyst 1, and all the other are gacs). The contact time in the fixed-bed reactor is 6s, and the reactor pressure is 0.5MPa. The reaction product is washed with water and alkali, then passed through the degassing device, enters the rectification tower for rectification, and finally passes through the drying device, and samples are taken from the outlet of the reactor for analysis. , acetylene conversion and 1,1-difluoroethane selectivity are listed in Table 1.

Embodiment 2、3、4

[0052] Embodiment 2,3,4: single reaction condition contrast

[0053] The reaction conditions are in accordance with the operation steps described in Example 1, keeping other reaction conditions unchanged, respectively controlling the reaction temperature to 200°C, 260°C, and 300°C, and analyzing the samples from the outlet of the reactor, the acetylene conversion rate and 1,1- Difluoroethane selectivity is listed in Table 1.

[0054] Table 1

[0055]

Embodiment 5、6、7、8

[0056] Embodiment 5,6,7,8 reaction contrast:

[0057] Reaction conditions are according to the operating procedure described in embodiment 1, keep other reaction conditions constant, control reaction material feed ratio respectively, control acetylene and HF feed volume ratio to be respectively 1: 3, 1: 6, 1: 9, 1:12 samples were analyzed at the outlet of the reactor, and the conversion rate of acetylene and the selectivity of 1,1-difluoroethane are listed in Table 2.

[0058] Table 2

[0059]

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Abstract

The invention provides a preparation method for 1-chlorine-1,1-difluoroethane. The target product 1-chlorine-1,1-difluoroethane with high purity is prepared from ethyne serving as an initial raw material by the steps of addition and chlorination. The price of the raw material ethyne used in the method is lower than that of raw materials such as vinylidene chloride and trichloroethane in the conventional method, so production cost is reduced. By the method, byproducts are few and the target product has high purity. The prepared 1-chlorine-1,1-difluoroethane can serve as a refrigerating agent, a foaming agent, a propelling agent, a cleaning agent, an aerosol jetting agent and the like.

Description

technical field [0001] The invention relates to a method for preparing halogenated hydrocarbons, in particular to a synthesis method for preparing 1-chloro-1,1-dichloroethane with acetylene. Background technique [0002] 1-Chloro-1,1-difluoroethane (commonly known as HCFC-142b) is a colorless, odorless, anesthetic gas with a boiling point of -0.96°C. Can burn in the air, it is a widely used compound, can be used as refrigerant, foaming agent, propellant, cleaning agent, aerosol propellant, etc. Due to its less damage to the ozone layer, it is a better substitute for Freon; in addition, 1-chloro-1,1-difluoroethane is used to synthesize 1,1-difluoroethylene (CF 2 = CF 2 ), the important material of CF 2 = CF 2 It is an important monomer for the industrial production of polyvinylidene fluoride resin PVDF. PVDF is a polymer material with good comprehensive properties and is widely used in electronic appliances, aerospace, audio equipment, medical equipment, optical instrumen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/12C07C17/10
Inventor 张永明韩春华王军
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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