Method for purifying sodium chloride and preparing doped carbon by pyrolyzing organic waste salt

A technology of sodium chloride and pyrolysis, applied in the preparation/purification of carbon, purification of alkali metal halides, etc., can solve the problems of occupation, waste salt is not effectively treated, waste of recyclable resources, etc., to achieve the realization of salt resources The effect of chemical utilization and promoting sustainable and coordinated development

Pending Publication Date: 2022-02-08
CHINA-SINGAPORE INT JOINT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This disposal method is expensive, not only occupies a large amount of land, but also has the risk of secondary environmental damage caused by external factors such as geological disasters
[0005] At present, although most people focus on the research on the synthesis and preparation of front-end chemical products, there are relatively few studies on the comprehensive recovery and treatment of waste salt in the process. Therefore, the waste salt produced in the synthesis process of many chemical products has not been effectively obtained. processing, resulting in the waste of a large amount of recyclable resources

Method used

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  • Method for purifying sodium chloride and preparing doped carbon by pyrolyzing organic waste salt
  • Method for purifying sodium chloride and preparing doped carbon by pyrolyzing organic waste salt
  • Method for purifying sodium chloride and preparing doped carbon by pyrolyzing organic waste salt

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Fully grind and sieve 5g of calcium methoxide waste salt (200 mesh);

[0037] (2) The calcium methoxide waste salt with uniform texture obtained in step (1) is placed in a tube furnace, and pyrolyzed in a nitrogen atmosphere at 350° C. for 2 hours;

[0038] (3) At room temperature of 24°C, cool the pyrolyzed solid obtained in step (2) to room temperature, weigh 4 g of the pyrolyzed solid, add 12 g of water to the weighed pyrolyzed solid, and stir thoroughly for 5 minutes, Make the waste salt fully dissolve completely, and then let it stand for 25 minutes to separate layers to obtain the upper and lower layers of liquid;

[0039] (4) filtering and separating the upper and lower layers of liquid obtained in step (3), drying the filter residue after filtering the upper layer of liquid, the drying temperature is 60°C, and reclaiming Al / O doped carbon material;

[0040] (5) Evaporate and crystallize the filtrate obtained in step (4) and the lower layer liquid in step (3...

Embodiment 2

[0044] (1) Fully grind and sieve 5g of calcium methoxide waste salt (150 mesh);

[0045] (2) The calcium methoxide waste salt slag obtained in step (1) is placed in a tube furnace, and pyrolyzed in a nitrogen atmosphere at 450° C. for 2 hours;

[0046] (3) At room temperature of 24°C, cool the pyrolyzed solid obtained in step (2) to room temperature, weigh 4 g of the pyrolyzed solid, add 20 g of water to the weighed pyrolyzed solid, and stir thoroughly for 5 minutes, Make the waste salt fully dissolve completely, and then let it stand for 35 minutes to separate layers to obtain the upper and lower layers of liquid;

[0047] (4) filtering and separating the upper and lower layers of liquid obtained in step (3), drying the filter residue after filtering the upper layer of liquid, the drying temperature is 70°C, and reclaiming Al / O doped carbon materials;

[0048] (5) Evaporate and crystallize the filtrate obtained in step (4) and the lower layer liquid in step (3) at 80° C., an...

Embodiment 3

[0052] (1) Fully grind and sieve 5g of calcium methoxide waste salt (100 mesh);

[0053] (2) The calcium methoxide waste salt slag with uniform texture obtained in step (1) is placed in a tube furnace, and pyrolyzed in an argon atmosphere at 550° C. for 2 hours;

[0054](3) At room temperature of 24°C, cool the pyrolyzed solid obtained in step (2) to room temperature, weigh 4g of the pyrolyzed solid, add 24g of water to the weighed pyrolyzed solid, and stir thoroughly for 5 minutes, Make the waste salt fully dissolve completely, and then let it stand for 45 minutes to separate layers to obtain the upper and lower layers of liquid;

[0055] (4) filtering and separating the upper and lower layers of liquid obtained in step (3), drying the filter residue after filtering the upper layer of liquid, the drying temperature is 80 ° C, and reclaiming Al / O doped carbon materials;

[0056] (5) evaporating and crystallizing the filtrate obtained in step (4) and the lower layer liquid of ...

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Abstract

The invention discloses a method for purifying sodium chloride and preparing doped carbon by pyrolyzing organic waste salt. The method comprises the following steps of: (1) fully grinding waste calcium methoxide salt, and sieving; (2) putting the uniform-texture waste calcium methoxide salt obtained in the step (1) into a tubular furnace, and pyrolyzing in an inert atmosphere; (3) adding water into the pyrolysis solid cooled to the room temperature in the step (2), stirring to completely dissolve the pyrolysis solid, and standing for layering to obtain upper-layer liquid and the lower-layer liquid; (4) filtering and separating the upper-layer liquid and the lower-layer liquid obtained in the step (3), and drying and recycling filter residues obtained after the upper-layer liquid is filtered to obtain an Al / O doped carbon material; and (5) evaporating and crystallizing the filtrate obtained in the step (4) and the lower-layer liquid obtained in the step (3), and further drying, separating and heating to separate out sodium chloride crystals. The method is simple in process, low in cost and large in treatment capacity, and can realize high-value utilization of waste salt.

Description

technical field [0001] The invention belongs to the field of purification and recovery of industrial waste salt slag, and in particular relates to a method for purifying sodium chloride by pyrolysis of organic waste salt and simultaneously preparing doped carbon. [0002] technical background [0003] In the production process of many fine chemicals and chemical pesticide products or intermediates, a large amount of by-product waste salt (hereinafter referred to as "waste salt") containing toxic and harmful chemicals is produced. Waste salt mainly contains inorganic salts such as sodium chloride and sodium sulfate, and its organic components often contain some toxic and harmful components. At present, the annual amount of chemical by-product salt slag in China is more than 700,000 tons, and this value is increasing year by year. These by-products of chemical production waste salt cannot be directly used as industrial raw materials because they contain toxic and harmful chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01B32/05
CPCC01D3/14C01B32/05C01P2004/03C01P2002/85C01P2006/40
Inventor 宿新泰周含峰林璋杨博
Owner CHINA-SINGAPORE INT JOINT RES INST
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