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Regeneration method for waste mercuric chloride contact agent

A technology of mercuric chloride and mercury catalyst, which is applied in chemical instruments and methods, catalyst regeneration/reactivation, chemical/physical processes, etc., can solve the problems of long reaction time, complicated treatment process, and large reagent consumption, and achieve effective Conducive to regeneration, process cleaning and environmental protection, large environmental benefits and economic benefits

Inactive Publication Date: 2018-12-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has problems such as complicated processing, large consumption of reagents, and long reaction time.

Method used

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  • Regeneration method for waste mercuric chloride contact agent

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] A kind of regeneration method of waste mercuric chloride catalyst, specifically comprises the following steps:

[0026] (1) Add reagent A to the spent mercuric chloride catalyst at a mass ratio of 1:2 of spent mercuric chloride catalyst and hydrochloric acid and mix well to obtain mixture B.

[0027] (2) Under the action of ultrasound (frequency 1000Hz, power 100W), the mixture B obtained in step (1) was subjected to leaching reaction for 5 minutes; the temperature was 30°C, and the filtrate and filter residue were obtained.

[0028] (3) Control the temperature of the mercury-containing filtrate in (2) to 40°C, adjust the pH value to 4 with sodium hydroxide, and react for 30 minutes to completely convert the mercury ions in the solution into mercury oxide precipitates; after filtration, mercury oxide is obtained , Dissolved with hydrochloric acid to obtain mercuric chloride solution for mercury catalyst.

[0029] (4) Under the condition of passing water vapor (the flow...

Embodiment 2

[0033] A kind of regeneration method of waste mercuric chloride catalyst, specifically comprises the following steps:

[0034] (1) Add reagent A to the spent mercuric chloride catalyst at a mass ratio of 1:4 of spent mercuric chloride catalyst to sodium thiosulfate and mix well to obtain mixture B.

[0035] (2) Under the action of ultrasound (frequency 2500Hz, power 200W), the mixture B obtained in step (1) was subjected to leaching reaction for 15 minutes; the temperature was 50°C, and the filtrate and filter residue were obtained.

[0036] (3) Control the temperature of the mercury-containing filtrate in (2) to 60°C, use sodium carbonate to adjust the pH value to 6, and react for 60 minutes to completely convert the mercury ions in the solution into mercuric oxide precipitates; after filtration, mercuric oxide is obtained, Dissolve with hydrochloric acid to obtain mercury chloride solution for mercury catalyst.

[0037] (4) Under the condition of passing water vapor (the fl...

Embodiment 3

[0041] A kind of regeneration method of waste mercuric chloride catalyst, specifically comprises the following steps:

[0042] (1) Add reagent A to the spent mercuric chloride catalyst at a mass ratio of 1:6 of spent mercuric chloride catalyst to hydrogen peroxide and mix evenly to obtain mixture B.

[0043] (2) Under the action of ultrasound (frequency 100Hz, power 10W), the mixture B obtained in step (1) was subjected to leaching reaction for 25min; the temperature was 80°C, and the filtrate and filter residue were obtained.

[0044] (3) Control the temperature of the mercury-containing filtrate in (2) to 80°C, adjust the pH value to 9 with sodium hydroxide, and react for 100 minutes to completely convert the mercury ions in the solution into mercuric oxide precipitates; after filtration, mercuric oxide is obtained , Dissolved with hydrochloric acid to obtain mercuric chloride solution for mercury catalyst.

[0045](4) Under the condition of feeding carbon dioxide gas (the ...

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Abstract

The invention discloses a regeneration method for a waste mercuric chloride contact agent and belongs to a recycling technique of the waste mercuric chloride contact agent. The regeneration method comprises the following steps: firstly, performing wet-process leaching on the waste mercuric chloride contact agent, performing leaching reaction under an ultrasonic effect, and filtering, thereby acquiring a mercury-containing filtrate; controlling temperature, adding a neutralizer for regulating pH value, completely converting mercury ions in the solution into mercuric oxide sediments, and keepingtoxic phosphor and sulfur in the mercury contact agent still in the solution; dissolving mercuric oxide with hydrochloric acid, thereby acquiring a mercuric chloride solution used for preparing the mercury contact agent; performing microwave high-temperature activating on filter residue (waste contact agent for mercury removal) under the condition of activating gas, thereby acquiring a regenerated activated carbon for waste mercury contact agent; soaking the activated carbon for waste mercury contact agent in a mercuric chloride solution for waste mercury contact agent, thereby acquiring a new mercuric chloride contact agent. According to the invention, efficient recycling of mercuric chloride and regeneration of activated carbon can be simultaneously realized in the manner of combining ultrasonic acidizing leaching with microwave high-temperature activating treatment.

Description

technical field [0001] The invention relates to a regeneration method of a waste mercury chloride catalyst, which belongs to the recovery and reuse technology of the waste mercury chloride catalyst. Background technique [0002] Polyvinyl chloride (PVC) is the second most used plastic in the world. Due to the energy status of "less oil and rich media" in China, my country currently mainly uses the calcium carbide method to produce PVC, and the calcium carbide method will still be used for a long time in the future. will dominate. The production of PVC by calcium carbide method includes three steps: calcium carbide production, VCM (vinyl chloride monomer) synthesis and VCM polymerization. In the second step, VCM is synthesized using acetylene and hydrogen chloride as raw materials and a mercury catalyst (activated carbon as a carrier, with a mercury chloride content of about 3.5-12.5%) as a catalyst. After the mercury catalyst is used for a period of time (about 8000 hours),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138B01J27/32B01J38/60B01J38/64B01J38/06
CPCB01J27/138B01J27/32B01J38/06B01J38/60B01J38/64
Inventor 张利波郭平刘超刘晨辉刘健石俊杰
Owner KUNMING UNIV OF SCI & TECH
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