Method for recycling organic resource in waste sulphuric acid and refining waste sulfuric acid

A resource recovery and waste sulfuric acid technology, applied in sulfur trioxide/sulfuric acid, chemical instruments and methods, inorganic chemistry, etc., can solve the problem that waste sulfuric acid cannot be recycled and processed

Inactive Publication Date: 2008-09-24
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the waste sulfuric acid produced in the production process of the fine chemical industry cannot be recovered and the treatment cost is high, the present invention provides a method for recycling organic resources in waste sulfuric acid and refining waste sulfuric acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 20ml of NDA-1800 resin into two jacketed glass adsorption columns (Φ32×360mm). At room temperature (20°C), the waste sulfuric acid (COD about 10000mg / L) of about 15% waste sulfuric acid (COD about 10000mg / L) produced in the production process of hydroxyanthraquinone is filtered and pretreated, and then passes through the composite functional resin bed at a flow rate of 1BV / h, and the wastewater is treated The amount is 10BV / batch, the COD of the adsorbed effluent is less than 50mg / L, and then the adsorbed effluent is concentrated until a colorless and transparent weight percentage of 98% sulfuric acid is obtained.

[0022] Use 5BV with a weight percentage of 12% N a OH aqueous solution + 8BV water, desorbed through the composite functional resin bed at 50°C at 1BV / h, and the desorption rate of organic matter on the resin was >99%. The high-concentration desorption solution obtained by resin regeneration is neutralized and recovered by 60% dilute sulfuric acid aqueous so...

Embodiment 2

[0024] The resin used in Example 1 was replaced with NDA-1600. The concentration of by-products in the production of hydroxyanthraquinone was about 15% by weight at 50°C. After pretreatment with filtration, waste sulfuric acid (COD about 10000mg / L) The flow rate of 5BV / h passes through the resin bed, the wastewater treatment volume is 5BV / batch, the adsorbed effluent COD is less than 50mg / L, and then the adsorbed effluent is concentrated until a colorless and transparent 98% sulfuric acid is obtained.

[0025] Using 5BV weight percentage is 8%N a OH aqueous solution + 5BV water, desorbed through the resin bed at 1BV / h at 70°C, and the desorption rate of organic matter on the resin was >99%. The high-concentration desorption solution obtained by resin regeneration is neutralized and recovered by 60% dilute sulfuric acid aqueous solution to recover organic intermediates such as hydroxyanthraquinone. The low-concentration desorption solution is used to circulate the preparation of de...

Embodiment 3

[0027] Put 40ml of NDA-1800 resin into two jacketed glass adsorption columns (Φ32×360mm). At 10℃, the waste sulfuric acid (COD about 1000mg / L) with a concentration of about 50% by-product during the production of aminoanthraquinone is filtered and pretreated, and then passes through the resin bed at a flow rate of 8BV / h. The wastewater treatment capacity is 80BV / For batches, the COD of the adsorbed effluent is less than 50 mg / L, and then the adsorbed effluent is concentrated until the colorless and transparent weight percentage of 93% sulfuric acid is obtained.

[0028] Use 1BV 16%N a OH aqueous solution + 3BV water, desorbed through the resin bed at 4BV / h at 30°C, and the desorption rate of organic matter on the resin was >99%. The high-concentration desorption solution obtained by resin regeneration is neutralized and recovered by a 60% dilute sulfuric acid aqueous solution to recover organic intermediates such as aminoanthraquinone. The low-concentration desorption solution is...

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PUM

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Abstract

The invention discloses a method for recovering organic resources in waste sulfuric acid and refining waste sulfuric acid. Firstly, the waste sulfuric acid derived from fine chemical product production departments is carried out with preliminary filter treatment; then the waste sulfuric acid is carried out with adsorption treatment by NDA-1800, NDA-1600, NDA-88, NDA99 or NDA-150 resin, and more than 99percent of organic matters in the waste sulfuric acid can be removed; the waste sulfuric acid after treatment is colorless transparent, and COD can be reduced to below 50mg/L; the resin can be completely escaped and regenerated by 4-14 percent of NaOH, and the escaped ratio is more than 95 percent. Dilute sulfuric acid after adsorption is concentrated to get colorless transparent 93-98 percent industrial concentrated sulfuric acid. The method avoids direct discharge or pollution transfer of the organic matters in the waste sulfuric acid, recovers organic resource having great economic value, produces the industrial concentrated sulfuric acid which can be used for production secondly, realizes curtailment of pollution load and recovers useful resources at the same time, and has obvious economic value and environment benefits.

Description

Technical field [0001] The invention relates to a method for recovering organic resources and refining waste sulfuric acid in waste sulfuric acid produced in the production process of dyes, medicines, perfumes, pesticide chemical intermediates and organic pigment intermediates in fine chemical industries. Background technique [0002] Waste sulfuric acid is an important inorganic chemical raw material, which is widely used in the manufacture of various chemical products and cleaning machinery products. Waste sulfuric acid is generally produced in industries such as chlor-alkali and fine chemicals. The concentration range is 10-70%, mainly containing fine chemical raw materials or products of different concentrations and types, and the COD caused by it is about 500-10000mg / L. Domestically, lime neutralization method is used for pretreatment, and oxidation or biochemical treatment is used for compliance treatment. The process is long, the cost is high, and it does not conform to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90C01B17/88
Inventor 刘福强胡大波李爱民李正斌荆晓生樊健赵卫伟孙越龙超朱兆连张全兴
Owner NANJING UNIV
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