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Production method of synthesizing HCFC-151a by using chloroethylene

A production method and technology of vinyl chloride, applied in the direction of halogen addition preparation, organic chemistry, etc., can solve the problems of shortage of raw materials and high production cost

Active Publication Date: 2009-02-18
ZHEJIANG SANMEI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of shortage of raw materials and high production costs in the industrial production of synthetic HCFC-141b, the present invention provides a production method for producing HCFC-151a by addition reaction of vinyl chloride and hydrofluoric acid under the action of a catalyst , and it is a production method for synthesizing HCFC-151a with high conversion rate, good selectivity, long service life of catalyst and low energy consumption

Method used

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  • Production method of synthesizing HCFC-151a by using chloroethylene
  • Production method of synthesizing HCFC-151a by using chloroethylene
  • Production method of synthesizing HCFC-151a by using chloroethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to the above process flow and steps, 1Kg TiCl is charged in the 50L reactor 1 4 And put in 1.5Kg of AHF for activation for 5 hours, then put in 10Kg of AHF and 10Kg of VCM, control the reaction temperature at about 15°C, and control the reaction pressure at 0.20-0.4Mpa. Half an hour later, reaction kettle 1 gas phase sampling chromatographic analysis gave the composition of the crude product shown in Table 1.

[0028] Table I

[0029]

[0030] Conclusion: CH can be calculated from the data in Table 1 2 = The selectivity of converting CHCl to HCFC-151a is 89.6%, and the selectivity of finally converting CFC-151a and HFC-152a is 99.92%.

Embodiment 2

[0032] According to the above process flow and steps, 1Kg TiCl is charged in the 50L reactor 1 4 And put in 1.5Kg of HF to activate for 5 hours, then put in 5Kg of AHF and 10Kg of VCM at the same time, control the reaction temperature at about 15°C, and control the reaction pressure at 0.20-0.4Mpa. Half an hour later, reaction kettle 1 gas phase sampling chromatographic analysis gave the composition of the crude product shown in Table 2. Table II

[0033]

[0034] Conclusion: CH can be calculated from the data in Table 2 2 = The selectivity of CHCl to HCFC-151a is 91.85%, and the selectivity of final conversion to HCFC-151a and HFC-152a is 99.36%.

Embodiment 3、4

[0036] According to the operating steps of Example 1, the reaction is carried out under the reaction conditions of temperature 3~8°C, pressure 0.05~0.1Mpa and temperature 40~45°C, pressure 0.6~0.8Mpa, and other conditions are constant, and the reaction crude product sampling chromatographic analysis gives The composition of the crude product is shown in Table 3. Table three

[0037]

[0038] Conclusion: The above data show that when the reaction is carried out at a temperature lower than 10°C, the conversion of VCM is not complete; when the reaction is carried out at a temperature greater than 40°C, the amount of high boilers generated increases; therefore, the optimum reaction temperature is 10-35 ℃.

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Abstract

The invention discloses a manufacturing method of HCFC-151a through vinyl chloride method, which comprises the following steps: 1. putting AHF into autoclave (1) with catalyst to activate; 2. putting AHF and vinyl chloride into autoclave (1) to addition for a while; analyzing the gas-phase of autoclave (1); 3. depressurizing the autoclave when the content of vinyl chloride is not more than 100PPm; refluxing; evaporating materials to quantize (3); discharging HFC-152a, HCl, HF; washing through alkaline; recycling HFC-152a; 4. entering raw materials into condenser (2) and quantizer (3); stewing; laminating; recycling AHF; obtaining the rough product.

Description

technical field [0001] The invention relates to a production method for synthesizing HCFC-151a, in particular to a production method for synthesizing HCFC-151a by vinyl chloride method. Background technique [0002] HCFC-151a (1-chloro-1-fluoroethane) is the raw material and intermediate for the preparation of HCFC-141b, HFC-152a and other refrigerant products. HCFC-141b (1,1-dichloro-1-fluoroethane) is a colorless, transparent and volatile liquid with relatively stable chemical properties. Its main purpose is to replace CFC-11 as a rigid polyurethane foaming agent, and Replace CFC-113 as cleaning agent. In developing countries, the use of HCFC-141b will be restricted from about 2016, and it will be officially withdrawn from use by 2030. There is still a lot of room for growth in the HCFC-141b market in the next few years. All HCFC-141b manufacturers are expanding or building new HCFC-141b production lines. At present, the domestic HCFC-141b production generally adopts the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/12C07C17/04
Inventor 占林喜陈国荣胡有团何晓玲
Owner ZHEJIANG SANMEI CHEM IND