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A kind of extraction method of recycling waste sulfur

A technology of extraction method and purification method, which is applied in the extraction field of waste sulfur recycling and reuse, can solve the problems of complex sulfur extraction process, high equipment investment and maintenance costs, high risk, etc. The effect of low cost and easy operation and control

Active Publication Date: 2017-12-12
HEFEI JIUYI AGRI DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an extraction method for the recycling and reuse of waste sulfur. The preparation method effectively solves the above-mentioned existing problems such as complex sulfur extraction process, high risk, and high equipment investment and maintenance costs.

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  • A kind of extraction method of recycling waste sulfur

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Effect test

specific Embodiment approach 1

[0023] An extraction method for recycling waste sulfur, the purification method comprises the following steps:

[0024] (1) 30 g of the waste sulfur crude product produced in the mercaptolation process with a khaki-yellow appearance and a content of 86%, was ground into powder (100 mesh) with a mortar, and 80 mL of ethyl acetate was added at room temperature, and stirred for 2 hours, filtered to remove impurities.

[0025] (2) Dissolve the solid sulfur filtered out in 80mL of 10% dilute sodium hydroxide aqueous solution, add gac 3.0g, after stirring at room temperature for 60 minutes, remove gac by filtration, the mother liquor color after decolorization is lighter, is light yellow.

[0026] (3) Adjust the pH value of the mother liquor to 5.8 with 35% concentrated hydrochloric acid, and filter.

[0027] (4) After heating the filtered sulfur to 50° C. and activating for 120 minutes, 25 g of light yellow sulfur was obtained, the content was 95%, and the yield was 92.0%.

specific Embodiment approach 2

[0028] An extraction method for recycling waste sulfur, the purification method comprises the following steps:

[0029] (1) 30 g of waste sulfur crude product produced in the mercaptolation process with a khaki-yellow appearance and a content of 85%, was ground into powder (170 mesh) with a mortar, and 80 mL of dichloromethane was added at room temperature, and stirred for 2 hours, filtered to remove impurities.

[0030] (2) Dissolve the filtered solid sulfur in 10% dilute sodium carbonate aqueous solution of 80mL, add gac 1.0g, after stirring at room temperature for 60 minutes, remove gac by filtration, the mother liquor color after decolorization is lighter, is light yellow.

[0031] (3) Adjust the pH value of the mother liquor to 5.9 with 35% concentrated hydrochloric acid, and filter.

[0032] (4) After heating the filtered sulfur to 65° C. and activating it for 100 minutes, 24 g of light yellow sulfur was obtained, the content was 95%, and the yield was 89.4%.

specific Embodiment approach 3

[0033] An extraction method for recycling waste sulfur, the purification method comprises the following steps:

[0034] (1) 30 g of the waste sulfur crude product produced in the mercaptolation process with a khaki-yellow appearance and a content of 86%, was ground into powder (240 mesh) with a mortar, and 80 mL of chloroform was added at room temperature, and stirred for 2 hours, Filter out impurities.

[0035] (2) Dissolve the filtered solid sulfur in 10% dilute potassium carbonate aqueous solution of 80mL, add gac 0.5g, after stirring at room temperature for 60 minutes, remove gac by filtration, the mother liquor color after decolorization is lighter, is light yellow.

[0036] (3) Adjust the pH value of the mother liquor to 6 with 35% concentrated sulfuric acid, and filter.

[0037] (4) After heating the filtered sulfur to 85° C. and activating it for 80 minutes, 26 g of light yellow sulfur was obtained, the content was 96%, and the yield was 96.7%.

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Abstract

The invention relates to an extraction method for recycling waste sulphur. The extraction method comprises the following steps: (1) fully crushing a waste crude sulphur product, adding an organic solvent, and filtering and removing impurities; (2) adding the filtered sulphur to a dilute alkali solution for dissolving, adding activated carbon for decoloring, and filtering to obtain a mother liquid; (3) adjusting the pH value of the obtained mother liquid with an acid and filtering; and (4) heating and activating the sulphur obtained in the step (3) to obtain recyclable sulphur. The extraction method has the beneficial effects that the process reaction is simple; operation and control are easy; the production cost is low; the yield is high; the problem that the waste sulphur is difficult to treat and the problem of environmental protection are effectively solved; the extraction method belongs to efficient emission reduction and green production technologies; and the obtained sulphur can be recycled and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for extracting waste sulfur, in particular to an extraction method for recycling waste sulfur. Background technique [0002] Waste sulfur generated in the mercaptolation process, khaki solid, hazardous chemical solid waste that is not easy to handle, the chemical reaction equation for generating waste sulfur is as follows: [0003] [0004] In the existing sulfonylurea-type nicosulfuron technical synthesis technology, the waste sulfur in the mercaptolation process has always been treated as a hazardous solid waste. With the increasing pressure on environmental protection in my country in recent years, the conventional treatment of this solid waste has Can not meet environmental protection requirements. [0005] Chinese Patent Publication No. CN91111804.7, published on June 30, 1993, the name of the invention is a method for purifying sulfur. The application specifically discloses a method for purifying sulfur. In t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/033
CPCC01B17/033C01P2006/80
Inventor 沈运河熊国银徐庆丰赵晓俊范富云
Owner HEFEI JIUYI AGRI DEV
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