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Method for removing 1,1-difluoro-2-chloroethylene in 1,1,2,2-tetrafluoroethane by adsorption

A technology of tetrafluoroethane and vinyl chloride, which is applied in chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc., can solve the problems of high adsorption temperature and poor regeneration performance, and achieve large adsorption capacity and superior regeneration performance , fast adsorption effect

Active Publication Date: 2019-07-12
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the disadvantages of high adsorption temperature and poor regeneration performance in existing chemical adsorption separation of trace HCFC-1122 in HFC-134a products, the present invention provides a feasible technical route, suitable for industrial production, low adsorption temperature, high adsorption capacity and high selectivity for the adsorption of 1,1-difluoro-2-chloroethylene (HCFC-1122), and the adsorption of 1,1,1,2-tetrafluoroethane (HFC-134a) with good regeneration repeatability Purification method

Method used

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  • Method for removing 1,1-difluoro-2-chloroethylene in 1,1,2,2-tetrafluoroethane by adsorption
  • Method for removing 1,1-difluoro-2-chloroethylene in 1,1,2,2-tetrafluoroethane by adsorption

Examples

Experimental program
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Effect test

Embodiment 1-4

[0026] Example 1-4 The effect of molecular sieve type on the adsorption performance of Cu(I) ion modified molecular sieve

[0027] 10g of adsorbent is filled in a stainless steel tube with an inner diameter of 15 mm and a length of 150 mm, and then the stainless steel tube is embedded in an adsorption fixed bed, and the crude product of HFC-134a containing about 950 ppm of HCFC-1122 and with a purity of about 99.87% is separated into gas phase form, at a temperature of 40°C and a pressure of 1 atm, take 1.0h -1 The space velocity enters the adsorption fixed bed from the top of the adsorption fixed bed, and then the gas adsorbed by the adsorbent of the stainless steel tube is used to analyze the content of each component in it with a gas chromatograph. The results are shown in Table 1.

[0028] Cu(I) ion-modified molecular sieve adsorption performance result table of table 1 embodiment 1-4

[0029]

[0030] As can be seen from Table 1, the Cu(I) ion-modified A, X, Y and ZSM...

Embodiment 5-10

[0031] Example 5-10 Effect of Copper Source on Adsorption Performance of Cu(I) Ion Modified Molecular Sieve

[0032] Other conditions are the same as in Examples 1-4, except that the adsorbent is a Cu(II) ion-modified molecular sieve prepared by exchanging and modifying self-reduction by preparing Cu(II) solutions with different copper sources. The results are shown in the table 2.

[0033] Cu(I) ion-modified molecular sieve adsorption performance result table of table 2 embodiment 5-10

[0034]

[0035] It can be concluded from Table 2 that different types of adsorbents modified by different copper sources have strong adsorption capacity and can achieve better adsorption effect.

Embodiment 11-18

[0036] Examples 11-18 Influence of the type of inert gas and activation temperature on the adsorption performance of Cu(I) ion-modified molecular sieves

[0037] Other conditions are the same as in Examples 1-4, except that the type and temperature of the activated inert gas are different during the preparation of the adsorbent. The results are shown in Table 3.

[0038] Table 3 Adsorption performance results of Cu(I) ion-modified molecular sieves in Examples 11-18

[0039]

[0040] As can be seen from Table 3, under the same type of adsorbent of the present invention and the same activation temperature, He, N 2 It has strong adsorption capacity when activated as an inert gas; the same type of adsorbent and the same activated inert gas have strong adsorption capacity at different activation temperatures (300°C, 350°C, 450°C, 500°C). , although when N2 is activated as an inert gas at an activation temperature of 300°C, compared with other temperatures, the adsorption capaci...

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Abstract

The invention discloses a method for removing 1,1-difluoro-2-chloroethylene in 1,1,1,2-tetrafluoroethane by adsorption. The method comprises the following steps: a 1,1,1,2-tetrafluoroethane crude product containing 1,1-difluoro-2-chloroethylene is in contact with a Cu(I) ion exchange modified molecular sieve adsorbent under a gas phase condition; and chemical adsorption is carried out on the 1,1-difluoro-2-chloroethylene by the adsorbent, so that the 1,1-difluoro-2-chloroethylene is removed from the 1,1,1,2-tetrafluoroethane crude product, and a purified 1,1,1,2-tetrafluoroethane product is obtained. Through adoption of the technology, the 1,1-difluoro-2-chloroethylene in the 1,1,1,2-tetrafluoroethane is high selectively removed at a lower adsorption temperature according to the characteristic that pi-complexation adsorption belongs to chemical adsorption, the adsorption capacity is large, the adsorption speed is high, and the method is environmentally friendly. The regeneration temperature of the adsorbent is not high, the regeneration performance of the adsorbent is excellent, requirements of large-scale industrial production can be met, and a good industrial application prospectis achieved.

Description

technical field [0001] The invention relates to a method for adsorbing and removing 1,1-difluoro-2-chloroethylene in 1,1,1,2-tetrafluoroethane. Background technique [0002] In recent years it has been recognized that chlorofluorocarbons (CFCs), which are widely used around the world, have adverse effects on the ozone layer so as to contribute to global warming. CFCs have a wide range of applications and can be used as refrigerants, blowing agents, and gas jet propellants. Hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) have a short atmospheric life due to the hydrogen atoms in their molecules. Their physical properties are very similar to those of CFCs, and they are non-toxic and non-flammable. They can all be substitutes for CFCs. . 1,1,1,2-Tetrafluoroethane, or HFC-134a, is one such substitute, specifically to replace difluorodichloromethane (F12) used as a refrigerant. To this end, HFC-134a should meet the criteria for the amount of impurities containin...

Claims

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Application Information

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IPC IPC(8): C07C17/389C07C19/08
Inventor 李建张波卢永康
Owner ZHEJIANG UNIV OF TECH
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