Purifying method of 1, 1, 1, 2-tetrafluoroethane

A technology of tetrafluoroethane and purification method, which is applied in chemical instruments and methods, halogenated hydrocarbon preparation, organic chemistry, etc., can solve the problem that adsorption separation technology does not have industrial application value, HCFC-1122 has low adsorption capacity and poor affinity difference. Significant problems such as achieving good industrial application prospects, meeting large-scale industrial production, and improving the effect of adsorption capacity

Active Publication Date: 2010-06-23
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0008] The main physical method—adsorption method can effectively remove HCFC-1122 without significantly affecting the purity and yield of HFC-134a, but the currently reported adsorbents are mainly activated carbon and H + 、Na + 、K + , Ca 2+ 、Sr 2+ The adsorption temperature of modified A, Y, and β zeolites is between -20°C and 100°C, and their adsorption of HCFC-1122 belongs to physical adsorption, that is, the affinity difference between HFC-134a and HCFC-1122 on these adsorbents Not significant, which causes the adsorption selectivity of the adsorbent to HCFC-1122 relative to HFC-134a is not high, that is, the adsorption capacity of HCFC-1122 is relatively low, making these existing adsorption separation technologies do not have significant industrial application value

Method used

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  • Purifying method of 1, 1, 1, 2-tetrafluoroethane
  • Purifying method of 1, 1, 1, 2-tetrafluoroethane

Examples

Experimental program
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Effect test

Embodiment 1-11

[0023] 10g of adsorbent is filled with an inner diameter of 15mm and a length of 150mm in a stainless steel tube, and the crude product of HFC-134a with a total weight of 50g and containing about 950ppm of HCFC-1122 and a purity of about 99.87% is in the gas phase at a temperature of 250℃, the pressure is normal pressure, take 1.0h -1 The space velocity enters the adsorption fixed bed from the top of the adsorption bed. The gas after adsorption was analyzed by gas chromatograph for the content of each component, and the results are shown in Table 1.

[0024] Table 1

[0025] Example

Embodiment 10-15

[0027] Other conditions are the same as those in Examples 1-9, except that the adsorbent is changed to CaY molecular sieve, and the adsorption temperature is changed to 100°C, 150°C, 200°C, 250°C, 300°C, and 350°C. The results are shown in Table 2.

[0028] Table 2

[0029]

[0030]

Embodiment 16-18

[0032] Other conditions are the same as in Examples 1-9, only the adsorbent is changed to LaY molecular sieve, and the feed space velocity of HFC-134a crude product is 0.1, 3.0, 10.0h -1 , and the results are shown in Table 3.

[0033] table 3

[0034]

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Abstract

The invention discloses a purifying method of 1, 1, 1, 2-tetrafluoroethane, which comprises the steps of: contacting a 1-chlorine-2, 2-difluoroethylene-containing 1, 1, 1, 2-tetrafluoroethane crude product with a cation-modified molecular sieve under the condition of gas phase; absorbing 1-chlorine-2, 2-difluoroethylene in the 1, 1, 1, 2-tetrafluoroethane crude product by taking the cation-modified molecular sieve as adsorbent; and controlling the absorption temperature at 150-350 DEG C to obtain the purified 1, 1, 1, 2-tetrafluoroethane, wherein the cation is selected from one or several combination of the following components: H+, alkaline earth metal ion, rare-earth metal ion or transition metal ion. With chemisorption, the purifying method selectively removes HCFC-1122 in HFC-134a, has higher absorption velocity, obviously improves the adsorption capacity of the HCFC-1122, and is environment-friendly.

Description

(1) Technical field [0001] The present invention relates to a method for purifying 1,1,1,2-tetrafluoroethane, especially for removing 1-chloro-2,2-dichloroethene from 1,1,1,2-tetrafluoroethane method. (2) Background technology [0002] In recent years, it has been recognized that chlorofluorocarbons (CFCs), which are widely used around the world, adversely affect the ozone layer so as to contribute to global warming. CFC has a wide range of applications and can be used as a refrigerant, foaming agent, and gas injection propellant. Therefore, people try to find a suitable substitute that can replace CFC in its application field without the above-mentioned harmful effects. 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 containing natural toxicity, such as chlorofluoroolefins. [0003] HFC-134a can be produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/389
Inventor 张波徐春雷石能富袁剑葛忠华
Owner ZHEJIANG UNIV OF TECH
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