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High-purity recycling process system of complex chemical waste liquid

A process system and resource-based technology, applied in the fields of alkali metal halide purification, disproportionation separation/purification of halogenated hydrocarbons, organic chemistry, etc., can solve problems such as equipment blockage

Active Publication Date: 2017-02-01
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Separation and recovery of chemical resources in such complex chemical waste liquids often have to overcome the following high technical difficulties: (1) contain both organic and inorganic substances, salt, water, and organic substances coexist; (2) contain two or more Salts; (3) Contain two or more organic substances; (4) Organic substances form complexes with inorganic salts (such as LiCl and NMP); (5) Organic substances and water form azeotropes (such as p-dichlorobenzene and water); (6) Some organic substances have sublimation characteristics, which can easily cause equipment blockage
In view of this, it is difficult to use traditional, single wastewater treatment methods to recycle the above-mentioned complex chemical waste liquids and obtain high-purity products

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] The water content is 30% (wt), NaCl is 10% (wt), NMP is 50% (wt), p-dichlorobenzene is 5%, and other trace impurities with high boiling point are 5%, and the flow rate is 15t / h. Wastewater is transported to the figure 1 Processed in the process system shown. The decomplexing agent used is Na 2 CO 3 The aqueous solution, waste liquid and decomplexing agent are fully mixed by the static mixer 1-2 and then sent to the decomplexing reactor 2 for decomplexing reaction, and the decomplexing reaction is carried out at normal temperature and pressure. The mixed material after decomplexation is sent to the evaporation tower 3 (evaporator with wiped film stirring) for evaporation operation, and its operating pressure is 0.8×10 5 Pa. The evaporated gas-phase material is sent to the rectification tower 4 through the pipeline at the top of the evaporation tower 3, and the concentrated salt solution in the tower kettle is cooled by the heat exchanger 3-3 and then enters the centr...

Embodiment 2

[0027] Will contain 32% (wt) of water, 8% (wt) of KCl, 50% (wt) of NMP, 5% of p-dichlorobenzene, and 5% of other trace impurities with high boiling point, and the flow rate is 20t / h. Wastewater is transported to the figure 1 Processed in the process system shown. The solution used is K 2 CO 3 The aqueous solution, waste liquid and decomplexing liquid are fully mixed by static mixer 1-2 and then sent into decomplexing reactor 2 for decomplexing reaction. The decomplexing reaction is carried out at a pressure of 0.9×10 5 Pa, the temperature is 50 ℃ under the conditions. The mixed material after the decomplexation is transported to the evaporation tower 3 for evaporation operation, and the operating pressure is 0.85×10 5 Pa. The evaporated gas-phase material is sent to the rectification tower 4 through the pipeline at the top of the evaporation tower 3, and the concentrated salt solution in the tower kettle is cooled by the heat exchanger 3-3 and then enters the centrifugal ...

Embodiment 3

[0029] Will contain water as 40% (wt), CaCl 2 10% (wt), 40% (wt) of NMP, 8% of p-dichlorobenzene, and 2% of other trace impurities with high boiling point, the chemical wastewater with a flow rate of 25t / h is sent to such as figure 1 Processed in the process system shown. The decomplexing agent used is an aqueous solution of CaO, and the waste liquid and the decomplexing agent are fully mixed by the static mixer 1-2 and then sent into the decomplexing reactor 2 for the decomplexing reaction, and the decomplexing reaction is carried out at a pressure of 0.85×10 5 Pa, the temperature is carried out under the condition of 45 ℃. The mixed material after the decomplexation is transported to the evaporation tower 3 for evaporation operation, and its operating pressure is 0.8×10 5 Pa. The evaporated gas-phase material is sent to the rectification tower 4 through the pipeline at the top of the evaporation tower 3, and the concentrated salt solution in the tower kettle is cooled by ...

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Abstract

The invention discloses a high-purity recycling process system of complex chemical waste liquid. The high-purity recycling process system consists of six units such as a decomplexing unit, an evaporation separating unit, an inorganic salt drying unit, an inorganic salt compound separation recycling unit, an organic matter and water comprehensive separation unit and a tail gas purification unit. The invention aims to provide a recycling process technical method for solving the complex chemical waste liquid generated in the production process of polyphenylene sulfide. According to the method, useful chemical substances (including water) in the complex chemical waste liquid consisting of paradichlorobenzene, catalyst LiCl, chemical solvent nitrogen methyl pyrrolidone, NaCl, water and minimal quantity lubrication high-boiling-point impurities are separated and refined one by one, and then 99.9% or not less than 99.99% of high-purity or ultra-pure chemical product is prepared for recycling, so that the recycling recovery rate reaches up to not less than 99%, the pollution problem of the complex chemical waste liquid is thoroughly solved, the system has the characteristics of high product quality, low energy consumption, high reliability and the like, and the system has a wide industrial application prospect.

Description

technical field [0001] The invention relates to a high-purity resource recovery process system for complex chemical waste liquid, in particular to a resource recovery process system for complex chemical waste liquid containing inorganic salts, organic matter and water. Background technique [0002] In the modern chemical industry, especially in the production process of new chemical materials, it is often necessary to add catalysts, chemical solvents, water and other substances, and the whole production process must involve complex waste liquids composed of various chemical substances. These waste liquids often contain inorganic salts, organic matter and water, most of which are chemically and biologically toxic and environmentally harmful. On the other hand, the catalysts and organic solvents used in many cases are generally expensive. If they are not recycled and reused, it will not only cause waste of resources, but also increase production costs. However, in the existin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267C07C17/38C07C17/383C07C25/08B01D53/78B01D53/68B01D53/48C01D3/14
CPCB01D53/48B01D53/68B01D53/78C01D3/14C01P2006/80B01D2251/304C07D207/267
Inventor 张志炳周政王宝荣孟为民
Owner NANJING UNIV
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