Method for synthesizing 2,3,3,3-tetrafluoropropene

A synthetic method, fluorine and chlorine technology, applied in 2 fields, can solve the problems such as the difficulty of catalyst preparation, achieve the effect of major industrial application prospects, easy to obtain, and less by-products

Active Publication Date: 2011-09-28
泉州宇极新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Doulas A et al. with CX 3 CF 2 CH 3 (HCFC-242) as raw material to synthesize HFO-1234yf (see US 2996555 for details), CX 3 CF 2 CH 3 X in (HCFC-242) is F, Cl, Br, and the transformation rate of this preparation method raw material is 60%, but this process catalyst preparation is relatively difficult
[0004] In summary, the process of preparing HFO-1234yf is a systematic process. Among the various process routes fo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

[0034] (1) Add DMF (1.25g), carbon tetrachloride (45.21g), and ethylene (15.43g) used in the telomerization reaction to a stainless steel container with a volume of 120ml and equipped with a valve. Mixed raw materials; (2) In a reactor with a length of 15 inches and a diameter of 1 / 8 inch PFE pipes, the inside is filled with composite metal fillers of iron, chromium, and nickel, and heated to 120°C in an electric furnace; (3) metering The pump pumps the mixed raw materials into the reactor at a flow rate of 0.2 ml / min. The reaction pressure is 0.6Mpa. (4) After 10 minutes of reaction, the reaction product is collected in a cold trap and the product composition is determined by GC. The TCP selectivity is 96.5%. Based on carbon tetrachloride, the yield of TCP was 68.2%, and the purity of TCP after purification under reduced pressure was 99%. (5) Add TCP to a 2L high-pressure reactor with a stirring device, and add chlorine to the high-pressure reactor through a ...

Example Embodiment

[0036] Example 2

[0037] (1) Add 1.25 g of DMF, 45.21 g of carbon tetrachloride, and 15.43 g of ethylene to a stainless steel container with a volume of 120ml and a valve, and shake it evenly, as the mixed raw material; (2) 15 inches in length and 1 in diameter A reactor with / 8 inch PFE pipes is filled with composite metal fillers of iron, chromium and nickel, and heated to 120°C in an electric furnace; (3) The mixed raw materials are fed into the reactor at a flow rate of 0.2 ml / min with a metering pump In the reactor, the reaction pressure is 0.8MPa. (4) After 30 minutes of reaction, the reaction products are collected in a cold trap, and the product composition is determined by GC. The TCP selectivity is 97.6%, and the TCP yield is 72.4 based on carbon tetrachloride. %; the reacted mixture is distilled to recover unreacted raw materials and co-catalysts, and vacuum distillation is used to obtain TCP with 99% purity. (5) Add TCP to a 2L autoclave with a stirring device, and ...

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PUM

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Abstract

The invention relates to a method for synthesizing 2,3,3,3-tetrafluoropropene, and belongs to the field of fluorine-containing refrigerants. The method comprises the following steps of: performing telomerization on carbon tetrachloride (CCl4) and ethylene serving as raw materials to generate CCl3CH2CH2Cl, chlorinating to obtain CCl3CHClCH2Cl, and performing fluorine-chlorine exchange and HF removal under the catalytic condition to obtain a final product HFO-1234yf. The raw materials are low-cost and readily available, so raw material cost in the process of producing the HFO-1234yf is reduced; the previous two steps in the method are liquid phase reaction, the reaction temperature is low, and reaction pressure is close to normal pressure; the subsequent two steps are gas phase continuous reaction, pressure and temperature are relatively low, and reaction conditions are easy to control, so equipment is relatively simple; in addition, the conversion rate in each step of the preparation method is high, a few byproducts are generated, and the yield of the target product is high, so the method has a wide industrial application prospect.

Description

technical field [0001] The invention belongs to the field of environment-friendly fluorine-containing refrigerants, and in particular relates to a new synthesis method of 2,3,3,3-tetrafluoropropene. Background technique [0002] Fluorinated refrigerants for industrial applications require short atmospheric survival time (ALT), low atmospheric ozone depletion potential (ODP) and greenhouse effect potential (GWP), non-toxic, non-flammable, non-explosive, chemical and thermal stability Better, it can adapt to different working temperature ranges. 2,3,3,3-Tetrafluoropropene (HFO-1234yf), as a single working refrigerant, has excellent environmental parameters and good cooling effect, and if HFO-1234yf is used as an automobile refrigerant, the original vehicle refrigerant can continue to be used Air-conditioning systems, so HFO-1234yf is considered to be a potential new-generation automotive refrigerant substitute, and has been accepted by automakers in Western Europe. [0003] ...

Claims

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Application Information

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IPC IPC(8): C07C21/18C07C17/35
Inventor 周晓猛贾晓卿鲍鹏
Owner 泉州宇极新材料科技有限公司
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