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Mercury chloride catalyst regenerated by oxychlorination method

A technology of mercuric chloride and chlorine oxidation, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of catalyst poisoning, deactivation, etc. short process effect

Inactive Publication Date: 2008-10-22
WANSHAN HONGJING MERCURY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ferrous iron, free iron and mercuric chloride react to generate non-catalytically active mercurous chloride and free mercury, which cause the catalyst to be poisoned and deactivated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Screening: Sieve the waste mercuric chloride catalyst, screen out the waste mercuric chloride catalyst with a particle size of 2.75-6.50mm, the waste mercuric chloride catalyst and mechanical inclusions that do not meet the particle size requirements, and pyrometallurgical ( Such as vertical spontaneous combustion furnace) recovery of metallic mercury;

[0014] (2) Activation reaction: the waste mercuric chloride catalyst 1000kg (4.5% of mercuric chloride content) that screens out and meets particle size requirement is placed in the activator, simultaneously, puts 2m in batching device 1 3 Water, feed 3kg of chlorine gas to dissolve it, make chlorine water, and pump it into the activator; at 30-35°C, under normal pressure, after soaking and activating for 30 minutes, put the soaking solution into the batching device I, Introduce 2kg of chlorine gas into the soaking solution to replenish the consumed chlorine water in the soaking solution, then pump it into the activ...

Embodiment 2

[0018] (1) screening: with embodiment 1;

[0019] (2) Activation reaction: the waste mercuric chloride catalyst 1000kg (3.0% of mercuric chloride content) that screens out and meets particle size requirement is placed in the activator, simultaneously, puts into 2m in batching device 1 3 Water, feed 3kg of chlorine gas to dissolve it, make chlorine water, and pump it into the activator; at 25-30°C, under normal pressure, after soaking and activating for 30 minutes, put the soaking solution in the batching device I, Introduce 3kg of chlorine gas into the soaking solution to supplement the chlorine water consumed in the soaking solution, then pump it into the activator to complete a soaking and circulation process; repeat the above soaking and circulation process until the color of the soaking solution changes from green to Light brown, then put the soaking solution in the batching device I, as a circulating mother liquor for the next batching use;

[0020] (3) Impregnation and ...

Embodiment 3

[0023] (1) screening: with embodiment 1;

[0024] (2) activation reaction: with embodiment 1;

[0025] (3) Impregnation and adsorption: After activation, the semi-finished product of mercury chloride catalyst is turned into the impregnation adsorber; 35kg of mercury chloride, 2.5m 3 Water and 5kg of hydrochloric acid with a weight concentration of 30% are added to the batching device II to dissolve it to obtain an impregnating liquid; pump it into the impregnating adsorber, and impregnate and adsorb for 8 hours at 40-45°C under normal pressure; it will be completed The impregnation solution of impregnation and adsorption is put into the impregnation and adsorption batching device II, and is used as circulating mother liquor:

[0026] (4) drying, cooling: with embodiment 1.

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Abstract

The invention discloses a chlorine-oxidation method for regenerating mercuric chloride catalyst, comprising the steps as follows: (1) screening; (2) activation reaction: 1000kg of screened waste mercuric chloride catalyst which complies with the requirement of particle size (the content of mercuric chloride is 3.0-4.5%) is taken as benchmark, arranged in an activator and prepared as dipping solution in a material distribution container I. The dipping solution is pumped into the activator, dipped and activated for 30 minutes under the conditions of the temperature of 15-40 DEG C and 0.1MPa of normal pressure, arranged in the material distribution container I, and pumped into the activator after 1-3kg of chlorine is pumped into the dipping solution, so as to complete a dipping and circulation process; the dipping and circulation process is repeated till that the colour of the dipping solution turns from green to pale brownish yellow; the dipping solution is then arranged in the material distribution container I and taken as circulation motor liquor used for the next material distribution; (3) dipping and adsorbing; (4) drying and cooling. The method of the invention has the advantages of short process flow, lower energy consumption, higher recovery and utilization additional value and utilization ratio of effective component, lower production cost and being more beneficial to environmental protection.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a catalyst regeneration method. Background technique [0002] The acetylene PVC process is widely used in countries with scarce oil resources and rich coal resources. The mercuric chloride catalyst used in it is faced with the increasingly scarce mercury resources, and the price is rising steadily. Therefore, the recovery and utilization of the spent mercuric chloride catalyst produced by it has attracted more and more attention. There are three main methods for this: ① coal-fired distillation furnace method; ② electrothermal distillation method; ③ vertical spontaneous combustion energy-saving furnace method. Its technical principle is: by adding milk of lime or caustic soda or soda ash to chemically pretreat the spent mercuric chloride catalyst to convert mercuric chloride into mercuric oxide. Then place them in the above three smelting furnaces respective...

Claims

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Application Information

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IPC IPC(8): B01J27/32B01J27/138
Inventor 张亚雄邓晓丹吴斌
Owner WANSHAN HONGJING MERCURY
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