A high-dispersion low-mercury catalyst for acetylene hydrochlorination and its preparation method

An acetylene hydrochlorination, mercury catalyst technology, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low dispersion of active component mercury chloride , low mercury catalyst, low dispersion, improper use of catalytic promoters, etc., to achieve the effect of long catalytic action time, improved effective utilization, and improved dispersion.

Active Publication Date: 2020-04-07
贵州重力科技环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In January 2015, the Ministry of Environmental Protection issued the "Notice on Strengthening the Prevention and Control of Mercury Pollution in the Production of Polyvinyl Chloride by the Calcium Carbide Method and Related Industries", proposing that by the end of 2015, the penetration rate of low-mercury catalysts in the calcium carbide process PVC industry would reach 100%, but the low Since the promotion of mercury catalysts, there have been problems such as low activity and short service life.
Patent No. CN201310573763.0 Invention Patent "Ultra-Low Mercury Catalyst and Its Production Process", Patent No. 201010203350.X Invention Patent "High Stability Composite Mercury Catalyst for Acetylene Hydrochlorination", Patent No. CN201310146100.0 Invention The patent "a low-mercury catalyst for acetylene hydrochlorination" and the invention patent with the patent number CN201510575561.9 "a composite low-mercury catalyst for acetylene hydrochlorination and its preparation method" both have the following disadvantages: ① The carrier activated carbon is not doped with nitrogen, because the nitrogen atom as an electron donor affects the surrounding carbon atoms and the supported catalytic active components, and at the same time has an anchoring effect on the active components, improving the dispersion of the active components;② No anti-carbon deposition agent is added to the catalyst. During the reaction process of acetylene and hydrogen chloride, there is a problem of acetylene self-polymerization. Acetylene self-polymers are deposited on the surface of the catalyst, blocking the catalytic active sites.
Therefore, the existing catalysts have the disadvantages of low dispersion of active components, low catalytic conversion rate, low utilization rate of mercuric chloride, high mercury content in spent catalysts, poor anti-coking effect and short service life.
[0004] Aiming at problems such as low dispersion of low-mercury catalysts, easy sublimation of mercury chloride, low catalytic conversion rate, and high content of mercury chloride in spent catalysts, the present invention effectively solves the above problems through continuous exploration of product development and use data

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1. A high-dispersion low-mercury catalyst for acetylene hydrochlorination, calculated in parts by weight, consisting of 6.5 parts of mercury chloride, 5.3 parts of indium chloride, 3.5 parts of nano-cerium dioxide, 4 parts of potassium chloride and 5% of nitrogen content Made of 80.7 parts of nitrogen-doped carrier.

[0024] The nitrogen-doped carrier is obtained by impregnating coconut shells in an aqueous solution with a molar ratio of pyrrole formaldehyde: melamine of 1:1, followed by carbonization, activation, rinsing and drying, and the nitrogen content in the prepared nitrogen-doped carrier is 5%. .

[0025] The preparation method of the high dispersion low mercury solid catalyst of acetylene hydrochlorination, prepares according to the following steps:

[0026] (a) Add mercuric chloride, indium chloride, potassium chloride and nano-cerium dioxide into the aqueous solution to obtain product A;

[0027] (b) Use Product A to ultrasonically impregnate nitr...

Embodiment 2

[0030] Example 2. A catalyst with high dispersion and low mercury fixation for acetylene hydrochlorination, calculated in parts by weight, consisting of 6 parts of mercury chloride, 5 parts of indium chloride, 2.5 parts of nano-cerium dioxide, 3.5 parts of potassium chloride and 3.5% nitrogen content Made of 83 parts of nitrogen-doped carrier.

[0031] The nitrogen-doped carrier is obtained by impregnating coconut shells in an aqueous solution with a molar ratio of pyrrole formaldehyde: melamine of 1:1, followed by carbonization, activation, rinsing and drying, and the nitrogen content in the prepared nitrogen-doped carrier is 4%. .

[0032] The preparation method of the high dispersion low mercury solid catalyst of acetylene hydrochlorination, prepares according to the following steps:

[0033] (a) Add mercuric chloride, indium chloride, potassium chloride and nano-cerium dioxide into the aqueous solution to obtain product A;

[0034] (b) Use Product A to ultrasonically im...

Embodiment 3

[0037] Example 3. A catalyst with high dispersion and low mercury fixation for acetylene hydrochlorination, calculated in parts by weight, consists of 4 parts of mercury chloride, 3.5 parts of indium chloride, 3 parts of nano-cerium dioxide, 2.5 parts of potassium chloride and 4% of nitrogen element Made of 87 parts of nitrogen-doped carrier.

[0038] The nitrogen-doped carrier is obtained by impregnating coconut shells in an aqueous solution with a molar ratio of pyrrole formaldehyde: melamine of 1:1, followed by carbonization, activation, rinsing and drying, and the nitrogen content in the prepared nitrogen-doped carrier is 4%. ; The nitrogen content in the obtained nitrogen-doped carrier is 3%.

[0039] The preparation method of the high dispersion low mercury solid catalyst of acetylene hydrochlorination, prepares according to the following steps:

[0040] (a) Add mercuric chloride, indium chloride, potassium chloride and nano-cerium dioxide into the aqueous solution to ...

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Abstract

The invention discloses a high-dispersity low-solid-mercury catalyst for hydrochlorination of acetylene and a preparation method thereof. The preparation method comprises the following steps: preparing a nitrogen doped carrier with large specific surface area by taking coconut shells, melamine and pyrrole formaldehyde as raw materials, and preparing the catalyst in a substep ultrasonic impregnation-infrared drying way under vacuum condition by taking mercury chloride as a main catalytic active component, indium chloride as a synergistic catalytic promoter, potassium chloride as a mercury-fixing agent and nano cerium dioxide as a carbon-deposition-resistant agent. The catalyst disclosed by the invention has the characteristics of large specific surface area, high dispersity of active components, high utilization rate of mercury chloride, high catalysis conversion rate, good carbon-deposition-resistant effect and long service life.

Description

technical field [0001] The invention relates to a chemical catalyst, in particular to a high-dispersion low-mercury catalyst for acetylene hydrochlorination and a preparation method thereof. Background technique [0002] In January 2015, the Ministry of Environmental Protection issued the "Notice on Strengthening the Prevention and Control of Mercury Pollution in the Production of Polyvinyl Chloride by the Calcium Carbide Method and Related Industries", proposing that by the end of 2015, the penetration rate of low-mercury catalysts in the calcium carbide process PVC industry would reach 100%, but the low Since the promotion of mercury catalysts, there have been problems such as low activity and short service life. The main reasons are the low dispersion of the active component mercuric chloride or improper use of catalytic promoters. Patent No. CN201310573763.0 Invention Patent "Ultra-Low Mercury Catalyst and Its Production Process", Patent No. 201010203350.X Invention Pate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26B01J35/10C07C17/08C07C21/06
CPCB01J31/26B01J35/1028C07C17/08C07C21/06
Inventor 李武斌张彬王良栋何家明梁丹全
Owner 贵州重力科技环保股份有限公司
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