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Purification method of 2,3,3,3-tetrafluoropropene

A technology of tetrafluoropropene and purification method, applied in chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc., can solve the problems of difficult operation and heavy load, etc.

Inactive Publication Date: 2017-09-19
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when carrying out azeotropic distillation using a composition containing hydrogen fluoride, it is necessary to make all the distillation equipment including the distillation tower and pipes resistant to hydrogen fluoride, the load on the equipment surface is large, and the operation is not easy, so there is a problem in terms of efficiency. question

Method used

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  • Purification method of 2,3,3,3-tetrafluoropropene

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Embodiment

[0097] Hereinafter, the present invention will be described in detail through examples. Examples 1 to 6, Examples 8 and 10 are examples, and Examples 7 and 9 are comparative examples. The present invention is not limited to these Examples.

example 1～7

[0099] In Examples 1 to 6, the distillation compositions shown in Tables 3 to 8 containing HFO-1234yf, HFO-1243zf, and R40 were prepared as the distillation compositions, respectively. In Example 7, the distillation composition shown in Table 9 containing only HFO-1234yf and HFO-1243zf was prepared as the distillation composition. In Examples 1 to 7, these compositions for distillation are supplied to the distillation column at a flow rate of 1.0 mol / hour from the 40th plate from the top of the distillation column with a theoretical plate number of 50 plates, respectively in Table 3 Continuous distillation was performed at the operating pressure [MPaG], column top temperature [°C], and column bottom temperature [°C] shown in Table 9.

[0100] In Examples 1 to 7, the distillate was taken out from the top of the tower and the bottom liquid was taken out from the bottom of the tower at the rates shown in Tables 3 to 9 (total amount of recovery [mol / hour]), respectively. The comp...

example 8、9

[0122] In Example 8, the distillation composition shown in Table 10 containing HFO-1234yf, HFC-152a, and R40 was prepared as the distillation composition. In Example 9, the distillation composition shown in Table 11 containing only HFO-1234yf and HFC-152a was prepared as the distillation composition. In examples 8 and 9, these distillation compositions are supplied to the distillation tower with a flow rate of 1.0 mol / hour from the 40th tray from the top of the distillation tower with a theoretical number of trays of 50 trays, respectively in Table 10 , and the operating pressure [MPaG], column top temperature [°C], and column bottom temperature [°C] shown in 11 were continuously distilled.

[0123] In Examples 8 and 9, the distillate was taken out from the top of the tower and the bottom liquid was taken out from the bottom of the tower at the rates shown in Tables 10 and 11, respectively (total amount of recovery [mol / hour]). The components of each distillate and bottom liq...

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Abstract

The present invention provides a method for efficiently purifying HFO-1234yf from a mixture containing 2,3,3,3-tetrafluoropropene (HFO-1234yf) and a fluorine-containing compound having a boiling point close to that of HFO-1234yf. The purification method of HFO-1234yf includes the following steps: (a) A step of preparing a distillation composition containing fluorine-containing compounds (excluding HFO-1234yf) having a boiling point of -14°C to -30°C, HFO-1234yf and methyl chloride (b) the process of supplying the above-mentioned distillation composition to the distillation of a fraction forming an azeotropic composition or an azeotrope-like composition containing HFO‑1234yf and methyl chloride; and (c) obtaining from the above-mentioned fraction A process for purifying HFO-1234yf in which the HFO-1234yf concentration is high.

Description

technical field [0001] The present invention relates to the purification method of 2,3,3,3-tetrafluoropropene, especially from the compound containing 2,3,3,3-tetrafluoropropene and the boiling point close to 2,3,3,3-tetrafluoropropene A method for efficiently purifying 2,3,3,3-tetrafluoropropene from mixtures of fluorinated compounds. Background technique [0002] As a new refrigerant to replace the greenhouse gas 1,1,1,2-tetrafluoroethane (HFC-134a), 2,3,3,3-tetrafluoropropene (HFO-1234yf) has received great expectations in recent years . In this specification, for halogenated hydrocarbons, the abbreviation of the compound is written in parentheses after the compound name, but the abbreviation is used instead of the compound name in this specification as necessary. [0003] As a method for producing HFO-1234yf, for example, a method of producing HFO-1234yf from a raw material containing chlorofluorocarbons by one reaction accompanied by thermal decomposition has been pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/386C07C21/18
CPCC07C17/386
Inventor 竹内优大塚哲央古田昇二
Owner ASAHI GLASS CO LTD
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