Process for improving recovery rate of solvent in mother liquid

A technology of recovery rate and mother liquor, applied in the chemical industry, can solve problems such as restricting production costs, and achieve the effects of increasing output rate, saving production costs, and reducing energy consumption

Active Publication Date: 2016-05-11
QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the mother liquor after washing the product cannot be reused, it will become a factor restricting the production cost.

Method used

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  • Process for improving recovery rate of solvent in mother liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The mother liquor produced by washing carbazole is used as the raw material of the solvent oil recovery system. The pump is used to feed the 1# solvent oil recovery tower (structured corrugated packing tower). The fraction at the bottom of the tower is heated by the pump through the tube furnace and then returns to the tower. The oil temperature at the outlet of the tube furnace is controlled at 300 °C. The temperature at the top of the tower is controlled at 110-130°C, the pressure is 10-20Kpa, and the purity of the extracted solvent oil is 99%. After being cooled by a 20°C circulating water cooler, it enters the solvent oil storage tank. The residual oil containing solvent oil ≤ 2% is extracted from the bottom of the tower, and fed to the 2# negative pressure tower (structured corrugated packing tower).

[0036] The heat source is provided by superheated steam at the bottom of the tower, the temperature at the top is controlled at 80-100°C, and the pressure is control...

Embodiment 2

[0040] The mother liquor produced by washing the refined anthracene is used as the raw material of the solvent oil recovery system. The pump is used to feed the 1# solvent oil recovery tower (structured corrugated packing tower). The fraction at the bottom of the tower is heated by the pump through the tube furnace and then returns to the tower. The oil temperature at the outlet of the tube furnace is controlled at 300 °C. The temperature at the top of the tower is controlled at 110-130°C, the pressure is 10-20Kpa, and the purity of the extracted solvent oil is 99%. After being cooled by a 20°C circulating water cooler, it enters the solvent oil storage tank. The residual oil containing solvent oil ≤ 2% is extracted from the bottom of the tower, and fed to the 2# negative pressure tower (structured corrugated packing tower).

[0041] The heat source is provided by superheated steam at the bottom of the tower, the temperature at the top is controlled at 80-100°C, and the pressu...

Embodiment 3

[0045] The mother liquor produced by washing carbazole is used as the raw material of the solvent oil recovery system. The pump is used to feed the 1# solvent oil recovery tower (structured corrugated packing tower). The fraction at the bottom of the tower is heated by the pump through the tube furnace and then returns to the tower. The oil temperature at the outlet of the tube furnace is controlled at 280 °C. The temperature at the top of the tower is controlled at 110-130°C, the pressure is 10-20Kpa, and the purity of the extracted solvent oil is 99%. After being cooled by a 20°C circulating water cooler, it enters the solvent oil storage tank. The residual oil containing solvent oil ≤ 3% is extracted from the bottom of the tower, and fed to the 2# negative pressure tower (structured corrugated packing tower).

[0046] The heat source is provided by superheated steam at the bottom of the tower, the temperature at the top is controlled at 90-100°C, and the pressure is control...

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Abstract

The invention discloses a process for improving the recovery rate of a solvent in mother liquid. According to the process, the mother liquid obtained after a product is washed serves as a raw material and passes through a positive pressure distillation tower which takes a tube furnace as a heat source, a tower top distillate is a solvent of which the content is greater than 99 percent, and a tower bottom raffinate contains the solvent with the content of 2 percent; the tower bottom raffinate passes through a negative pressure distillation tower which takes hot steam as a heat source, and the tower top distillate is the solvent of which the content is greater than 99 percent; the tower top distillate enters a solvent storage tank through a negative pressure system, and the tower bottom raffinate contains the solvent with the content of 0.8 percent; after the tower bottom raffinate is subjected to the negative pressure distillation through a residual oil storage tank, a top effluent is the solvent of which the content is greater than 99 percent; the solvent enters the solvent storage tank through the negative pressure system, and the residual oil at the tank bottom contains the solvent with the content below 0.1 percent. The tower top distillate which is subjected to double-negative pressure distillation enters the solvent storage tank after being subjected to two-stage condensation, wherein the first-stage cooling is water cooling; the tower top distillate is subjected to the second-stage cooling after the water cooling, and the second-stage cooling is refrigerating fluid cooling. Residues are guided into a raw material tank or poured away to serve as the raw materials of other processes according to the content of internal substances.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a process for improving the recovery rate of solvent in mother liquor. Background technique [0002] In my country's chemical production, the separation and purification of products and the purity of purified products have become the restrictive factors for the development of chemical technology. Low product purity leads to low product price and low added value, thus inhibiting the development of technology by enterprises and making technological progress slow. In addition, the high price of high-purity products in the market has made some enterprises make great efforts in the separation and purification of products, and have made great progress in technology. Especially in recent years, the deep processing technology of coal tar resources has been rapidly developed and applied. Among them, refined anthracene, carbazole, and fluorene in tar are important ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14
CPCB01D3/143
Inventor 刘春林罗国林
Owner QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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