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A kind of method of reclaiming sodium 2-naphthalene sulfonate from 2-naphthol production waste water

A technology for producing sodium naphthalenesulfonate and waste water, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of high COD, high chroma and high salt content of 2-naphthol production waste water, and achieve The effect of less consumption

Active Publication Date: 2014-10-22
SINOCHEM ENERGY SAVING ENVIRONMENTAL PROTECTION HLDG BEIJING
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AI Technical Summary

Problems solved by technology

[0002] 2-Naphthol production wastewater has high chroma, high COD, and high salt content, which cannot meet environmental protection requirements through traditional biochemical degradation treatment
In the prior art, an extraction treatment method is used for 2-naphthol production wastewater, but this method consumes a lot of energy and chemicals, and does not involve the effective recovery of sodium 2-naphthalenesulfonate in wastewater

Method used

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Examples

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Embodiment 1

[0021] Embodiment 1: For the user whose production capacity of 2-naphthol product reaches more than 10,000 tons, implement the method of reclaiming sodium 2-naphthalenesulfonate from 2-naphthol production wastewater of the present invention, and can obtain higher purity from production wastewater every day 2-4 tons of sodium 2-naphthylsulfonate, which can be reused in the production of 2-naphthol, is equivalent to realizing a daily income of more than 20,000 yuan. Due to the energy-saving method of heating with secondary steam, the operating cost of recovering sodium 2-naphthalenesulfonate is quite low.

[0022] Sodium 2-naphthalenesulfonate is gray-white crystal or powder, soluble in water, insoluble in alcohol, and its uses include organic synthesis or emulsifier for animal glue. The total weight content of salt in 2-naphthol production wastewater is about 10-15%, the weight content of 2-naphthalenesulfonic acid sodium salt is 1.5-2.5%, and the weight content of the sum of s...

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PUM

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Abstract

The invention relates to a method of recovering 2-sodium naphthalenesulfonate from 2-isonaphthol production wastewater. By adopting the method, not only can a production raw materials resource 2-sodium naphthalenesulfonate be obtained, but also subsequent treatment of production wastewater is facilitated. The method is characterized by comprising the following steps: concentrating 2-isonaphthol production wastewater till 2-sodium naphthalenesulfonate in the wastewater is preferably separated out while other salinities are not separated out so as to form a solid-liquid mixture containing first mother liquor and a 2-sodium naphthalenesulfonate solid by means of the characteristic that the solubility of 2-sodium naphthalenesulfonate in the 2-isonaphthol production wastewater is less than that of other salinities; and then, separating and recovering the 2-sodium naphthalenesulfonate solid from the solid-liquid mixture.

Description

technical field [0001] The invention relates to a 2-naphthol production wastewater treatment technology, in particular to a method for recovering sodium 2-naphthalenesulfonate from the 2-naphthol production wastewater. Background technique [0002] 2-Naphthol production wastewater has high chroma, high COD, and high salt content, which cannot meet environmental protection requirements through traditional biochemical degradation treatment. In the prior art, an extraction treatment method is used for 2-naphthol production wastewater, but this method consumes a lot of energy and chemicals, and does not involve the effective recovery of sodium 2-naphthalenesulfonate in the wastewater. The inventor believes that if the sodium 2-naphthalenesulfonate in the 2-naphthol production wastewater can be recovered in an energy-saving manner, not only can the production raw material resources be obtained, but also the subsequent treatment of the production wastewater will be beneficial. C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/44C07C309/35
Inventor 李洪彬刘颢刘晗
Owner SINOCHEM ENERGY SAVING ENVIRONMENTAL PROTECTION HLDG BEIJING
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