Process for treating high-purity pyridine solution

An aqueous, high-concentration technology, used in natural water treatment, extracted water/sewage treatment, water/sludge/sewage treatment, etc. Environmental and social benefits, low operating costs, economical and simple recycling methods

Inactive Publication Date: 2010-05-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses toluene and benzene with certain toxicity as dehydrating agents, which limits its application.
It has been reported in the literature that pyridine-water is separated by adding salt and phase-separation technology using potassium fluoride aqueous solution as a salting-out agent. The purity of pyridine in the organic phase is 92.6%, which is not high.
There are not many reports on the use of solvent extraction, and only this method is mentioned in the literature, but the type of extraction agent is not given

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Pyridine solution is the actual material of a factory, with a concentration of ~88% (wt%) and a pH of ~8.2.

[0020] First, an 88% pyridine solution was azeotropically distilled. The rectification separation adopts a glass column with an inner diameter of 22mm, which is filled with high-efficiency stainless steel triangular wire packing, and the packing height is 0.8m. A 500ml three-neck flask was used for the tower kettle, and an electric thermostat jacket was used for external heating. After the kettle liquid is heated and vaporized, an azeotrope with a vapor phase temperature of 94°C is formed at the top of the tower, condensed, part of it is refluxed to the tower with a reflux ratio of 3, and the other part is discharged to obtain recovered crude pyridine. When the temperature of the vapor phase rises again, the transition fraction is collected until the temperature of the vapor phase reaches 100°C, the azeotropic distillation is completed, and after cooling, the r...

Embodiment 2

[0023] The pyridine solution is prepared from tap water with a concentration of ~30% (wt%) and a pH of ~7.4.

[0024] Take 100ml of pyridine solution, add 100ml of biodiesel, stir at room temperature for 30min, let it stand for 5-10min, then take out the water phase; then extract with an equal volume of biodiesel, as above, a total of 6 stages of extraction. The solution concentration of the effluent is <1.0% (wt%).

Embodiment 3

[0026] The pyridine solution was prepared from tap water with a concentration of ~16% (wt%) and a pH of ~7.2.

[0027] Take 150ml of pyridine solution, add 15ml of biodiesel, stir at room temperature for 30min, let it stand for 10min, take out the water phase; then extract with biodiesel 0.1 times the volume of the water phase, as above, a total of 6 stages of extraction. The solution concentration of the effluent is <10.2% (wt%).

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PUM

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Abstract

Process for treating high-concentration pyridine aqueous solution is carried out by boiling while distilling for high-concentration pyridine aqueous at constant temperature continuously, delivering itto top of tower to obtain pyridine-constant-hydrated boiling substances, circulation utilizing, hierarchical extracting 1-10 times with coarse pyridine biological diesel-oil as extracting solvent atnormal temperature, or countercurrent extracting continuously in proportion of solvent: waste water=5:1-1:10 and pH=4-10 for 3-30 mins, laying aside for 5-15 mins, separating, decompress distilling for extracting phase containing pyridine and biological diesel-oil, and recovering pyridine and biological diesel oil. It's simple, economical and has better effect and no environmental pollution.

Description

technical field [0001] The invention relates to the field of waste water treatment, and mainly relates to a new process for treating high-concentration pyridine aqueous solution. Background technique [0002] Pyridine is an extremely important pharmaceutical and chemical raw material, as well as a good organic solvent and organic synthesis catalyst. In the production process of pesticides and medicines, high-concentration wastewater containing 10-20% pyridine is produced. Pyridine is poisonous, is a heterocyclic compound with a strong foul smell, is significantly but not very strong alkaline, is easily soluble in water, and is not easily biodegradable in the environment. Pyridine-water constitutes an azeotropic system, and its azeotropic composition is pyridine:water=57.0:43.0 (mass fraction), which brings great difficulties to the separation of pyridine-water system. [0003] Treating high-concentration pyridine wastewater and recovering part of pyridine can not only real...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D213/16C02F1/26C02F103/36C02F101/38
Inventor 计建炳于凤文姬登祥徐之超俞云良艾宁
Owner ZHEJIANG UNIV OF TECH
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