Process for synthesizing vinyl chloride by using mercury-free catalyst

A technology of mercury catalyst and vinyl chloride, applied in the field of synthesizing vinyl chloride using mercury-free catalyst, can solve the problem of high water content, and achieve the effects of reducing water content, improving conversion effect, and reducing hydrogen content

Inactive Publication Date: 2021-12-21
山东新龙节能环保设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a process for synthesizing vinyl chloride using a mercury-free catalyst, which can completely realize mercury-free conversion, so that hydrogen chloride can completely react with excess acetylene, remove the traditional purification systems such as water washing and alkali washing for tail gas, and solve the problem of containing A series of problems caused by high water volume will prolong the life of the mercury-free catalyst while increasing the yield and purity of vinyl chloride

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  • Process for synthesizing vinyl chloride by using mercury-free catalyst

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Embodiment 1

[0041] Such as figure 1 As shown, a system for synthesizing vinyl chloride using a mercury-free catalyst includes: hydrogen chloride gas inlet pipe 1, acetylene gas inlet pipe 2, sulfuric acid drying tower 3, pressure swing adsorption device 4, mixer 5, acetylene drying device 6, pre- Heater 7, mercury-free foreground converter 8, mercury-free background converter 9, corrosion-resistant compressor 10, first condenser 11, crude monomer storage tank 12, rectification system 13, dichloroethane purification and rectification system 14. Mercury-free three-stage converter 15, second condenser 16, and gas-liquid separator 17.

[0042] A process for synthesizing vinyl chloride using a mercury-free catalyst, specifically:

[0043] 1. Raw material dehydration: pass the raw material hydrogen chloride gas into the sulfuric acid drying tower 3 for washing, drying and dehydration to obtain dehydrated dry hydrogen chloride gas;

[0044] The moisture content of the raw material hydrogen chl...

Embodiment 2

[0063] A process for synthesizing vinyl chloride using a mercury-free catalyst, specifically:

[0064] 1. Raw material dehydration: pass the raw material hydrogen chloride gas into the sulfuric acid drying tower 3 for washing, drying and dehydration to obtain dehydrated dry hydrogen chloride gas;

[0065] The moisture content of the raw material hydrogen chloride gas is ≥1000ppm before dehydration, and the moisture content after dehydration is ≤300ppm.

[0066] The sulfuric acid concentration in the described sulfuric acid drying tower 3 is 98%.

[0067] 2. Separation of hydrogen: the dehydrated dry hydrogen chloride gas is passed into the pressure swing adsorption device 4 to separate excess hydrogen from hydrogen chloride to obtain dry hydrogen chloride after hydrogen separation.

[0068] The mass fraction of hydrogen chloride in the dehydrated dry hydrogen chloride gas is 94.3%, and the hydrogen content is 300ppm; the mass fraction of hydrogen chloride in the dry hydrogen ...

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Abstract

The invention discloses a process for synthesizing vinyl chloride by using a mercury-free catalyst, and belongs to the technical field of chemical synthesis. The process comprises the steps of raw material dehydration, hydrogen separation, conversion, gas-liquid separation and post-treatment. The raw material dehydration comprises the following steps: introducing the raw material hydrogen chloride gas into a sulfuric acid drying tower, washing, drying and dehydrating to obtain dehydrated dry hydrogen chloride gas; hydrogen separation: introducing dehydrated dry hydrogen chloride gas into a pressure swing adsorption device, and separating redundant hydrogen from hydrogen chloride to obtain dry hydrogen chloride after hydrogen separation; according to the process, mercury-free treatment can be thoroughly realized, hydrogen chloride and excessive acetylene are completely reacted, traditional tail gas water washing, alkali washing and other purification systems are removed, a series of problems caused by high water content during preparation of vinyl chloride through an acetylene method are solved, and the yield and the purity of vinyl chloride are improved while the service life of a mercury-free catalyst is prolonged.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a process for synthesizing vinyl chloride using a mercury-free catalyst. Background technique [0002] As the world's five general-purpose resins, PVC is widely used in various industries due to its excellent flame retardancy, wear resistance, corrosion resistance, and easy processing. However, my country's energy structure characteristics of "rich in coal, poor in oil, and low in gas" determine that the PVC production process of calcium carbide acetylene method occupies an absolute position in my country's PVC production enterprises, reaching more than 80%. With the advancement of the mercury-free process of the Minamata Convention, the calcium carbide acetylene process PVC industry has faced a major test of reducing mercury consumption and pollution, and the industry is facing an urgent need for mercury-free catalysts to replace low-mercury catalysts. [0003] Altho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/08C07C17/383C07C21/06C07C19/045C01B7/07B01J27/122
CPCC07C17/08C07C17/383C01B7/0718B01J27/122C07C21/06C07C19/045
Inventor 李通
Owner 山东新龙节能环保设备有限公司
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