Method for preparing low-mercury catalyst by employing high/middle-porosity active carbon

A technology for the preparation of activated carbon and low-mercury catalysts, applied in the field of fine chemistry, can solve the problems of high reaction temperature, high loss rate of mercuric chloride, poor thermal stability, etc., and achieve improved catalytic efficiency, shortened activation time, and lowered reaction temperature Effect

Active Publication Date: 2015-12-30
NINGXIA JINHAI CHUANGKE CHEM TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The performance index of the catalyst itself is not ideal;
[0007] (2) Mercury chloride has a high loss on ignition rate and poor thermal stability;
[0008] (3) For the synthesis reaction of vinyl chloride, the catalytic effect is not good, the required reaction temperature is high, and the activation time of hydrogen chloride is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 A method for preparing low-mercury catalyst by adopting activated carbon with high and medium porosity

[0028] Step 1 Preparation of Activated Carbon

[0029] (1) Selection of raw coal

[0030] The raw coal is anthracite, with a moisture content of 6%, an ash content of 8.5%, a volatile matter content of 34.5%, and a fixed carbon content of 51%.

[0031] (2) Deashing of raw coal

[0032] Grind the anthracite, pass through a 100-mesh sieve, put the coal powder into a 30ppm polyaluminum chloride solution, stir vigorously at a speed of 5000r / min, after 2 minutes, reduce the speed to 500r / min, stir for 10 minutes, and filter , washed with distilled water until the filtrate is neutral; add polyacrylamide solution, the concentration of polyacrylamide is 0.5ppm, the rotation speed is 400r / min, after stirring for 10 minutes, filter, wash with distilled water until the filtrate is neutral, the ash content after deliming 1.5%.

[0033] (3) Carbonization

[...

Embodiment 2

[0056] Embodiment 2 above-mentioned catalyst is used for synthetic reaction of vinyl chloride

[0057] In the reaction that the catalyst of the present invention is used to prepare vinyl chloride by acetylene hydrochlorination, the molar ratio of the reaction feed gas is C 2 h 2 / HCl=1 / 1.1, the space velocity of acetylene is 67h -1 , the reaction temperature is 110°C, and the hydrogen chloride activation time is 20 minutes.

[0058] The reaction tail gas was analyzed by chromatography, and the conversion rate of acetylene was 99.94%, the yield of vinyl chloride was 95.6%, and the catalytic efficiency was improved by 4m 3 / h; the reaction temperature is reduced to 110°C, the reaction temperature of the prior art is above 130°C, and the hydrogen chloride activation time is shortened by 20%.

[0059] Unless otherwise specified, the percentages used in the present invention are all weight percentages, and the ratios described in the present invention are all mass ratios.

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PUM

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Abstract

A provided method for preparing a low-mercury catalyst by employing high/middle-porosity active carbon comprises preparation of an adsorption liquid and adsorption processing. The adsorption processing step comprises ultrasonic assisted adsorption and microwave assisted adsorption. The prepared low-mercury catalyst comprises, in percent by weight, 4.2% of mercuric chloride, 8.4% of barium chloride, 8.4% of potassium chloride, 4.2% of platinum(II)-ammonium chloride, 4.2% of tetraammineplatinum(II) chloride, and 0.19% of water. The catalyst possesses the mechanical strength of 98.8%, the granularity of 3-6 mm (98.7%), and the bulk density of 475 g/L. The prepared low-mercury catalyst is low in mercuric chloride ignition loss and good in heat stability. When being applied to synthetic reaction of vinyl chloride, the prepared low-mercury catalyst is good in catalysis effect, and helps to reduce reaction time and shorten activation time of hydrogen chloride.

Description

Technical field [0001] The present invention involves a method of using high -middle -holy carbon -based carbon -to -preserve low mercury catalysts, which belongs to the field of fine chemistry technology. Background technique [0002] Polyvinyl chloride (PVC) synthesized by chloroly chlorine monomers is one of the largest thermoplastic resin products in the world. It is widely used in plastic building materials, packaging materials, electronic electrical products, pharmaceutical industries, coatings and adhesives.Essence [0003] At present, the industrialized production of synthetic alcohol monitors is mainly ethylene.Affected by the great fluctuations in crude oil prices, PVCs by acetylene through hydrogen chloride have an important position in China.At present, the hydrogen chloride response in the industry mainly uses high mercury catalysts with a carriers of mercury chloride from 12%to 15%.Health causes serious harm. [0004] The use of low mercury catalysts is increasingly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138C07C17/08C07C21/06
Inventor 常炳恩李建平李玉强李通李庆孙玉梅
Owner NINGXIA JINHAI CHUANGKE CHEM TECH
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