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Preparation method of low-mercury catalyst

A low-mercury catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of limited mercury chloride content, uneven catalyst quality, uneven distribution of mercury chloride, etc. question

Active Publication Date: 2016-12-07
NINGXIA JINHAI CHUANGKE CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main process problems that exist are that the distribution of mercuric chloride in the activated carbon is uneven, and a large amount of it is distributed on the surface, and the content of mercuric chloride inside the activated carbon is limited. The concentration of the catalyst is lower than that of the lower part, which leads to differences in the quality of the catalyst obtained by the same immersion, and the quality of the catalyst is not uniform. Therefore, a low-mercury catalyst with uniform quality and a high content of mercury chloride in the activated carbon can be obtained, which can improve the quality of the low-mercury catalyst. Activity, stability and service life

Method used

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  • Preparation method of low-mercury catalyst

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Comparison scheme
Effect test

Embodiment 1

[0048] A preparation method of a low-mercury catalyst, comprising the following steps:

[0049] Deionized water washing: the carbon tetrachloride adsorption rate is greater than or equal to 70%, the specific surface area is greater than or equal to 1200㎡ / g, and the mechanical strength is greater than or equal to 95%, and the activated carbon is first placed in deionized water and rinsed once, during which the water keeps flowing .

[0050] Hydrochloric acid washing: take out the activated carbon from the clean water, place the activated carbon in a hydrochloric acid solution with a concentration of 3.5-5% for rinsing, and keep the hydrochloric acid solution flowing during this period, and repeatedly use the hydrochloric acid solution with a concentration of 3.5-5% to rinse the activated carbon until before rinsing and rinsing Stop washing when the concentration difference of the final hydrochloric acid solution is less than or equal to 5%, then take out the activated carbon fr...

Embodiment 2

[0061] A preparation method of a low-mercury catalyst, comprising the following steps:

[0062] Deionized water washing: the carbon tetrachloride adsorption rate is greater than or equal to 70%, the specific surface area is greater than or equal to 1200㎡ / g, and the mechanical strength is greater than or equal to 95%, and the activated carbon is first placed in deionized water and rinsed once, during which the water keeps flowing .

[0063] Hydrochloric acid washing: take out the activated carbon from the clean water, place the activated carbon in a hydrochloric acid solution with a concentration of 3.5-5% for rinsing, and keep the hydrochloric acid solution flowing during this period, and repeatedly use the hydrochloric acid solution with a concentration of 3.5-5% to rinse the activated carbon until before rinsing and rinsing Stop washing when the concentration difference of the final hydrochloric acid solution is less than or equal to 5%, then take out the activated carbon fr...

Embodiment 3

[0078] A preparation method of a low-mercury catalyst, comprising the following steps:

[0079] Deionized water washing: the carbon tetrachloride adsorption rate is greater than or equal to 70%, the specific surface area is greater than or equal to 1200㎡ / g, and the mechanical strength is greater than or equal to 95%, and the activated carbon is first placed in deionized water and rinsed once, during which the water keeps flowing .

[0080] Hydrochloric acid washing: take out the activated carbon from the clean water, place the activated carbon in a hydrochloric acid solution with a concentration of 3.5-5% for rinsing, and keep the hydrochloric acid solution flowing during this period, and repeatedly use the hydrochloric acid solution with a concentration of 3.5-5% to rinse the activated carbon until before rinsing and rinsing Stop washing when the concentration difference of the final hydrochloric acid solution is less than or equal to 5%, then take out the activated carbon fr...

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Abstract

The invention provides a preparation method of a low-mercury catalyst. According to the preparation method of the low-mercury catalyst, the adsorption rate of activated carbon for chlorides such as mercuric chloride is increased under the condition of negative pressure, mercuric chloride is enabled to penetrate into the inner layer of the activated carbon more deeply, the stability and the use efficiency of the low-mercury catalyst are improved, and the service life of the low-mercury catalyst is prolonged; meanwhile, a chloride solution is uniformly mixed by the aid of the form of bubbles, the mixing effect is moderate, the good mixing effect is realized while crushing of the activated carbon is avoided, the original condition of inconsistent up-and-down concentrations of the chlorides and the solution is eliminated, the chlorides on the surface of the activated carbon are pushed inwards while the bubbles act on the activated carbon at the moment, so that the mercuric chloride further penetrates into the inner layer of the activated carbon, and the low-mercury catalyst with high quality and long service life is obtained.

Description

technical field [0001] The invention relates to a preparation method of a low-mercury catalyst for the synthesis of vinyl chloride through addition reaction of acetylene gas and hydrogen chloride gas, in particular to a preparation method of the low-mercury catalyst. Background technique [0002] At present, the low-mercury catalysts used for the addition reaction of acetylene gas and hydrogen chloride gas to synthesize vinyl chloride are usually impregnated at atmospheric pressure. Mercury is fixed in activated carbon. However, the main process problems that exist are that the distribution of mercuric chloride in the activated carbon is uneven, and a large amount of it is distributed on the surface, and the content of mercuric chloride inside the activated carbon is limited. The concentration is lower than the concentration in the lower part, resulting in differences in the quality of the catalyst obtained by the same immersion, and the quality of the catalyst is not unifo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138
CPCB01J27/138B01J37/0205B01J37/0236B01J37/04
Inventor 李玉强
Owner NINGXIA JINHAI CHUANGKE CHEM TECH
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