2-naphthol high-salt and high-concentration organic matter wastewater recycling process and system

A technology with high concentration of organic matter, applied in the field of resources and environment, can solve the problems of unreasonable treatment of wastewater, secondary pollution, high treatment costs, etc., and achieve significant technical and economic effects, wide application range, and huge social benefits

Active Publication Date: 2016-09-28
TIANJIN UNIVERSITY OF TECHNOLOGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the domestic production of 2-naphtholic acid is 170,000 tons, and the annual output of this wastewater is about 4 million tons. The existing domestic processes mainly include extraction and recovery of organic matter, resin exchange, advanced oxidation, concentration reduction, wet oxidation and other treatment technologies. , but to varying degrees, the treatment costs are too high, or the treatment produces secondary pollution, resulting in this kind of wastewater has not been properly treated

Method used

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  • 2-naphthol high-salt and high-concentration organic matter wastewater recycling process and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A process for recycling 2-naphthol high-salt and high-concentration organic waste water, the steps are as follows:

[0030] 1) Extraction crystallization process

[0031] 2-Naphthol wastewater enters the extraction and crystallization kettle, and at a temperature of 35°C, add 30% ethanol extraction solvent of wastewater quality, and after standing for 30 minutes, sodium sulfate crystals are precipitated, solid-liquid separation, and crystallization is sent to step 3) high-temperature oxidation furnace system , the liquid enters step 2) to recover the extractant and naphthalenesulfonate.

[0032] 2) reclaim naphthalenesulfonate and extractant

[0033]From step 1), the extraction solution contains a large amount of solvent, a small amount of sodium sulfate, sodium sulfite and naphthalenesulfonate and other organic components, and enters the evaporator to evaporate and recover ethanol at 80°C, and the recovered ethanol solvent returns to step 1); low-salt and high-organic...

Embodiment 2

[0037] A process for recycling 2-naphthol high-salt and high-concentration organic waste water, the steps are as follows:

[0038] 1) Extraction crystallization process

[0039] 2-Naphthol wastewater enters the extraction and crystallization kettle, and at a temperature of 35°C, add 20% ethanol extraction solvent of wastewater quality, and after standing for 40 minutes, sodium sulfate crystals are precipitated, solid-liquid separation, and crystallization is sent to step 3) high-temperature oxidation furnace system , the liquid enters step 2) to recover the extractant and naphthalenesulfonate.

[0040] 2) reclaim naphthalenesulfonate and extractant

[0041] From step 1), the extraction solution contains a large amount of solvent, a small amount of sodium sulfate, sodium sulfite and naphthalenesulfonate and other organic components, and enters the evaporator to evaporate and recover ethanol at 80°C, and the recovered ethanol solvent returns to step 1); low-salt and high-organi...

Embodiment 3

[0045] A process for recycling 2-naphthol high-salt and high-concentration organic waste water, the steps are as follows:

[0046] 1) Extraction crystallization process

[0047] 2-Naphthol wastewater enters the extraction and crystallization kettle, and at a temperature of 38°C, add 30% methanol extraction solvent of wastewater quality, and after standing for 50 minutes, sodium sulfate crystals are precipitated, solid-liquid separation, and crystallization is sent to step 3) high-temperature oxidation furnace system , the liquid enters step 2) to recover the extractant and naphthalenesulfonate.

[0048] 2) reclaim naphthalenesulfonate and extractant

[0049] From step 1), the extraction solution contains a large amount of solvent, a small amount of sodium sulfate, sodium sulfite, naphthalenesulfon and other organic components, and enters the evaporator to evaporate and recover methanol at 80°C, and the recovered methanol solvent returns to step 1); low-salt and high-organic w...

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Abstract

The invention discloses a 2-naphthol high-salt and high-concentration organic matter wastewater recycling process and system; an extraction crystallization process is designed for recovery naphthalenesulfonate for reuse production; organic compounds are oxidized at high temperature for producing anhydrous sodium sulfate for sale, tail gas is absorbed for producing sodium sulfite for circular use in 2-naphthol production; all components of 2-naphthol wastewater are recycled with low cost, zero emission of pollutants is realized, and the method is a currently reasonable recycling process for the 2-naphthol high-salt and high-concentration organic wastewater, and at the same time, the system for realizing the process is designed. The process and the system have popularization value for recycling disposal of the high-organic-matter wastewater, and have great economic and social effects.

Description

technical field [0001] The invention belongs to the field of resources and environment, in particular to a process and system for recycling 2-naphthol high-salt and high-concentration organic waste water. Background technique [0002] The rapid development of the national economy has led to the rapid development of petroleum, chemical, pharmaceutical, paper, food and other industries. At the same time, the discharge of wastewater containing high concentrations of refractory organic pollutants and ammonia nitrogen compounds is also increasing at a faster rate. Conventional physical Chemical and biochemical treatment methods are difficult to meet the technical and economic requirements for the standard treatment of such wastewater. Up to now, most of the wastewater with high salt and high concentration of organic matter has not found a very reasonable way to solve the pollution problem, causing many environmental problems. Seriously affecting social harmony and national econom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D5/00C01D5/18C07C303/44C07C309/35C02F103/36
CPCC01D5/00C01D5/18C02F1/041C02F1/26C02F1/52C02F9/00C02F2001/5218C02F2103/36C07C303/44C07C309/35
Inventor 李梅彤袁文蛟张小江张柯夏协兵郑勇范文浩
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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