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Method for recycling waste mercury catalyst

A waste mercury catalyst and catalyst technology, used in chemical recovery, chemical instruments and methods, mercury halide and other directions, can solve the problems of high corrosion of equipment, high operating cost, mercury catalyst poisoning, etc., and achieve high recovery efficiency and improve desorption. Efficiency, ensuring the effect of efficient utilization

Inactive Publication Date: 2014-05-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Phosphorus and sulfur in the raw gas poison the mercury catalyst
Because mercury chloride vapor is highly corrosive to equipment, special anti-corrosion materials must be used, which has disadvantages such as high energy consumption, high equipment requirements, and high operating costs.

Method used

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  • Method for recycling waste mercury catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Weigh 200g of waste mercury catalyst, which contains 3.4% mercury chloride, add it to 800ml of water, heat to 70°C, carry out hot-melt pretreatment under stirring, adjust the pH value to 1, and at 70°C, after ultrasonic treatment for 60min Taking advantage of the situation to filter, the mercuric chloride, phosphorus, and sulfur impurities detached from the surface of the activated carbon can be separated from the activated carbon in time. After filtering, the obtained activated carbon can be used in the preparation of mercuric chloride catalyst after being washed and sieved. Heat the obtained mercury-containing filtrate to 50°C, add sodium carbonate solution, adjust the pH to 6, and react for 30 minutes, so that the mercury ions in the solution are completely converted into mercuric oxide precipitates, while the mercury catalyst poisons phosphorus and sulfur remain in the solution. After filtering, the mercuric oxide filter cake is obtained, which is dissolved with hyd...

Embodiment 2

[0019] Weigh 200g of waste mercury catalyst, which contains 3.4% mercury chloride, add it to 900ml of water, heat to 75°C, carry out hot-melt pretreatment under stirring, adjust the pH value to 2, and at 75°C, through 50min ultrasonic treatment, in Filtration in the ultrasonic field enables the mercuric chloride, phosphorus, and sulfur impurities detached from the surface of the activated carbon to be separated from the activated carbon in time. After filtering, the obtained activated carbon can be reused in the preparation of mercuric chloride catalyst after being washed and sieved. Heat the obtained mercury-containing filtrate to 60°C, add solid sodium carbonate, adjust the pH to 7, and react for 40 minutes, so that the mercury ions in the solution are completely converted into mercuric oxide precipitates, while the mercury catalyst poison phosphorus and sulfur remain in the solution. After filtration, the mercuric oxide filter cake is obtained, which is dissolved with hydro...

Embodiment 3

[0021] Weigh 200g of waste mercury catalyst, which contains 3.9% mercury chloride, add it to 1000ml of water, heat to 80°C, carry out hot-melt pretreatment under stirring, adjust the pH value to 3, and at 80°C, after ultrasonic treatment for 40min Taking advantage of the situation to filter, the mercuric chloride, phosphorus, and sulfur impurities detached from the surface of the activated carbon can be separated from the activated carbon in time. After filtering, the obtained activated carbon can be reused in the preparation of mercuric chloride catalyst after being washed and sieved. Heat the obtained mercury-containing filtrate to 70°C, add solid sodium bicarbonate, adjust the pH to 8, and react for 50 minutes, so that the mercury ions in the solution are completely converted into mercuric oxide precipitates, while the poisonous phosphorus and sulfur in the mercury catalyst remain in the solution . After filtration, the mercuric oxide filter cake is obtained, which is diss...

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Abstract

The invention discloses a method for recycling a waste mercury catalyst. The method comprises the steps of adding the waste mercury catalyst into water, controlling the temperature at 70-95 DEG C, carrying out hot dissolution pretreatment while stirring, regulating the pH value to 1-3, and filtering after carrying out ultrasonic treatment for 10-60min or filtering in an ultrasonic field to separate mercuric chloride and phosphorus and sulfur impurities from activated carbon in time, wherein the mercuric chloride and the phosphorus and sulfur impurities are separated from the surface of the activated carbon; after filtering, washing the obtained activated carbon and sieving to prepare a mercury catalyst; controlling the temperature of mercury-contained filtrate at 50-90 DEG C, adding a neutralizing agent to regulate the pH value to 6-8, and reacting for 30-90min, wherein mercury ions in the solution are completely converted into mercuric oxide sediments, and toxic substances, namely phosphorus and sulfur in the mercury catalyst still remain in the solution; filtering to obtain a mercuric oxide filter cake, and dissolving with hydrochloric acid to obtain a mercuric chloride solution for preparing the mercury catalyst. According to the invention, the waste mercury catalyst is recycled through acidification-ultrasonic synergistic desorption, coupling and filtration, therefore, the method is simple in process, high in efficiency and low in energy consumption.

Description

[0001] technical field [0002] The invention relates to a recovery and utilization technology of waste mercury catalyst using activated carbon as a carrier in the calcium carbide method to produce PVC, in particular to a method for recycling waste mercury catalyst through acidification-ultrasonic cooperative desorption coupling filtration. Background technique [0003] Polyvinyl chloride (PVC) has the characteristics of excellent heat resistance, wear resistance, and chemical corrosion resistance. It is widely used in industry, construction, agriculture and other industries. It is the largest general-purpose synthetic resin material in my country. Preparation methods are generally divided into two types: calcium carbide method and ethylene method. Due to the shortage of oil resources and abundant coal resources in my country, PVC produced by the calcium carbide method accounts for the main share, accounting for about 70% of the total PVC. Mercury chloride catalyst (commonl...

Claims

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Application Information

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IPC IPC(8): C01G13/04B01J27/138B01J27/32
CPCY02P20/584
Inventor 邱运仁闫升
Owner CENT SOUTH UNIV
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