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Method for extracting diphenol from wastewater

A technology for dihydric phenol and wastewater, applied in separation methods, chemical instruments and methods, and water pollutants, etc., can solve the problems of low dephenolization efficiency, harsh solvent recovery conditions, and high solvent prices.

Inactive Publication Date: 2021-06-08
SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved in the present invention is to overcome defects such as low dephenolization efficiency in wastewater, harsh solvent recovery conditions, and expensive solvents in the prior art, thereby providing a method for extracting dihydric phenols from wastewater

Method used

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  • Method for extracting diphenol from wastewater
  • Method for extracting diphenol from wastewater
  • Method for extracting diphenol from wastewater

Examples

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Effect test

Embodiment 1

[0046] The present embodiment provides a method for extracting dihydric phenols from waste water, comprising the steps of:

[0047] Wastewater deoiling: Using the difference in density and polarity, most of the oil in the coal chemical wastewater is removed in the grease trap.

[0048] Wastewater deacidification: The acid gas in the deoiled wastewater is removed by heating and stripping.

[0049] Wastewater deammonization: The ammonia in the acid removal wastewater is removed by stripping and the ammonia is cooled and recovered.

[0050] Wastewater phenol extraction: use solvent A to extract the phenolic substances in the deamination wastewater, and the obtained dephenolization wastewater is sent to subsequent biochemical treatment. Among them, the mass ratio of solvent A to deamination wastewater is 1:10, and the extraction temperature is 50°C. Solvent A is dimethyl carbonate.

[0051] Removal of phenol-containing solvents: Removal of solvent A by distillation of phenol-co...

Embodiment 2

[0064] The present embodiment provides a method for extracting dihydric phenols from waste water, comprising the steps of:

[0065] Wastewater deoiling: Using the difference in density and polarity, most of the oil in the coal chemical wastewater is removed in the grease trap.

[0066] Wastewater deacidification: The acid gas in the deoiled wastewater is removed by heating and stripping.

[0067] Wastewater deammonization: The ammonia in the acid removal wastewater is removed by stripping and the ammonia is cooled and recovered.

[0068] Wastewater phenol extraction: use solvent A to extract the phenolic substances in the deamination wastewater, and the obtained dephenolization wastewater is sent to subsequent biochemical treatment. Among them, the mass ratio of solvent A to deammonization wastewater is 1:5, and the extraction temperature is 30°C. Solvent A is dimethyl carbonate.

[0069] Removal of phenol-containing solvents: Removal of solvent A by distillation of phenol-...

Embodiment 3

[0081] The present embodiment provides a method for extracting dihydric phenols from waste water, comprising the steps of:

[0082] Wastewater deoiling: Using the difference in density and polarity, most of the oil in the coal chemical wastewater is removed in the grease trap.

[0083] Wastewater deacidification: The acid gas in the deoiled wastewater is removed by heating and stripping.

[0084] Wastewater deammonization: The ammonia in the acid removal wastewater is removed by stripping and the ammonia is cooled and recovered.

[0085] Wastewater phenol extraction: use solvent A to extract the phenolic substances in the deamination wastewater, and the obtained dephenolization wastewater is sent to subsequent biochemical treatment. Among them, the mass ratio of solvent A to deamination wastewater is 1:10, and the extraction temperature is 50°C. Solvent A was ethyl acetate.

[0086] Removal of phenol-containing solvents: Removal of solvent A by distillation of phenol-contai...

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Abstract

The invention belongs to the technical field of chemical wastewater treatment, and particularly relates to a method for extracting diphenol from wastewater. The diphenol is directly extracted from the coal chemical industry wastewater through cooperation of two times of extraction and fraction cutting of the carbolic oil component, the raw materials are convenient to obtain and low in price, good economic benefits are achieved, emission reduction of phenol in the wastewater can be achieved, meanwhile, the requirements for optimization and environmental protection of the industrial structure are met, the concept of turning waste into wealth is achieved, important diphenol chemical raw materials are provided for fine chemical enterprises, ammonia and phenolic substances are removed for subsequent biochemical treatment at the same time, the biochemical treatment difficulty is lowered, environmental pollution is reduced, and good social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical wastewater treatment, and in particular relates to a method for extracting dihydric phenol from wastewater. Background technique [0002] The shortage of water resources has become the bottleneck of the sustainable development of coal chemical industry. The environmental protection standard for near-zero discharge of coal chemical wastewater is mandatory and an important measure for the sustainable use of water resources. Industry and academia have developed and implemented various near-zero-discharge wastewater treatment processes, but there is no set of processes that can truly achieve zero-discharge wastewater in the application of coal tar processes. [0003] Phenolic compounds in phenolic wastewater are toxic substances, and they are common types of wastewater that are difficult to degrade and treat in industrial wastewater. Phenol-containing wastewater not only endangers human health, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C07C37/72C07C37/74C02F1/02C02F1/20C02F1/40C02F101/16C02F101/34
CPCC02F9/00C07C37/72C07C37/74C02F2101/345C02F2101/16C02F1/40C02F1/02C02F1/20
Inventor 李秀辉赵耀飞孙江江刘伟刘宁王雄雄述子清
Owner SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
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