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A kind of front and rear two-stage combined catalyst and its application

A combined catalyst, two-stage technology, used in catalytic reactions, catalyst carriers, molecular sieve catalysts, etc., can solve problems such as reducing production efficiency

Active Publication Date: 2021-11-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the catalyst in the first stage of the front stage needs to convert more than 90% of acetylene, its activity decreases rapidly. When the activity of the front stage catalyst is insufficient, the front stage catalyst and the background catalyst will be reversed during actual production (that is, "overturned"), thereby saving the cost of the catalyst , but doing so reduces productivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0058] In the present invention, the CM-H / S 1 The preparation method comprises the following steps:

[0059] mixing the cheap metal compound solution, the non-metallic heteroatom compound and water to obtain the first mixed solution;

[0060] Mix the first porous solid carrier with the first mixed solution, perform the first impregnation, take out and dry to obtain CM-H / S 1 .

[0061]The invention mixes cheap metal compound solution, non-metal heteroatom compound and water to obtain the first mixed solution. In the present invention, the concentration of the cheap metal compound solution is preferably 0.1-1 g / mL, more preferably 0.3-0.7 g / mL.

[0062] In the present invention, the mixing is preferably stirring mixing, and the stirring speed is preferably 430-450 rpm, more preferably 440 rpm. In the present invention, the stirring is preferably carried out at room temperature, and the present invention does not have any special requirements on the stirring time, as long as ...

Embodiment 1

[0076] Select columnar activated carbon as the first porous solid carrier and the second porous solid carrier, its particle size is 40 mesh, ash content 3.0wt%, specific surface area is 950m 2 / g, pore volume 0.6mL / g. Mix 5mL of copper phthalocyanine solution containing 1g / mL of Cu with 10mL of nitrogen nitrogen dimethylformamide, and then add 85mL of deionized water to further mix to obtain a mixed solution, and add the mixed solution dropwise to 100g at 30°C Columnar activated carbon carrier, and impregnated for 8h. The impregnated catalyst was vacuum-dried at 110° C. for 12 hours to obtain a front catalyst, denoted as A1, wherein the Cu loading was 5 wt %;

[0077] 0.5 mL of RuCl with a Ru content of 0.1 g / mL 3 The solution was mixed with 5g of 1-ethyl-3-methylimidazole bis-nitrile ammonium salt, and further mixed with 97mL of deionized water to obtain a mixed solution. At 30°C, the mixed solution was added dropwise to 100g of columnar activated carbon carrier and impregn...

Embodiment 2

[0080] Select columnar activated carbon as the first porous solid carrier and the second porous solid carrier, its particle size is 50 mesh, ash content 5.0wt%, specific surface area 850m 2 / g, pore volume 0.58mL / g. Mix 10mL of copper chloride solution with a Cu content of 1g / mL and 10mL of nitrogen nitrogen dimethylformamide, and then add 80mL of deionized water to further mix to obtain a mixed solution, and add the mixed solution dropwise to 100g at 30°C Columnar activated carbon carrier, and impregnated for 8h. The impregnated catalyst was vacuum-dried at 110° C. for 12 hours to obtain a front catalyst, denoted as A2, wherein the Cu loading was 10 wt %;

[0081] 3 mL of RhCl containing 0.1 g / mL Rh 3 The solution was mixed with 2.5g tetrabutylphosphine bistrifluoromethanesulfonimide salt and 7.5g 1-ethyl-3-methylimidazole bis-nitrile amine salt, and then 97mL deionized water was further mixed to obtain a mixed solution, 30 At ℃, the mixed liquid was added dropwise to 100g...

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PUM

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Abstract

The invention provides a front and back two-stage combined catalyst and its application, belonging to the technical field of catalysts. In the present invention, the foreground catalyst plays the role of activating hydrogen chloride, and can lighten the load of the background catalyst. The present invention uses NM‑IL / S 2 As a background catalyst, wherein the ionic liquid can increase the dispersion of noble metals and suppress the loss of noble metals; in the present invention, the background catalyst bears the main catalytic load. Since hydrogen chloride has been activated by the front catalyst, the background catalyst has High catalytic efficiency, which can meet the industrial requirement that the conversion rate of acetylene should reach more than 97%. At the same time, because the front catalyst has activated hydrogen chloride, when the background catalyst catalyzes the conversion of acetylene into vinyl chloride, it can avoid "flying temperature" phenomenon, thereby increasing the service life of the catalyst.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a front and back two-stage combined catalyst and its application. Background technique [0002] Polyvinyl chloride (PVC) is the third largest general-purpose plastic, and is generally obtained by polymerization of its monomer vinyl chloride. Due to the energy occurrence characteristics of rich coal, poor oil and little gas in my country, the preparation of vinyl chloride by coal-based calcium carbide acetylene method is the mainstream process of polyvinyl chloride production in my country. Yet the used catalyst of existing synthetic vinyl chloride is mercuric chloride, the mercury-free chloride that takes metal chloride as active component, because mercury catalyst has easy sublimation, easy sublimation, loss, its high toxicity not only causes serious pollution to environment, and Also seriously endanger people's health. Therefore, people gradually put the research emphasis o...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J31/30B01J31/24B01J27/18B01J21/18B01J21/04B01J21/08B01J21/06B01J27/186B01J29/40B01J23/10B01J32/00B01J37/02B01J35/10C07C17/08C07C21/06
CPCB01J31/183B01J31/1815B01J31/30B01J31/24B01J31/1691B01J27/1813B01J27/1817B01J31/1658B01J21/04B01J21/08B01J21/063B01J27/186B01J29/40B01J23/10B01J37/0201C07C17/08B01J2531/16B01J2531/821B01J2531/828B01J2531/18B01J2531/822B01J2231/32B01J35/19B01J35/617B01J35/618B01J35/635B01J35/615C07C21/06
Inventor 李小年赵佳王赛赛丰枫王婷张群峰
Owner ZHEJIANG UNIV OF TECH
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