Method for comprehensive utilization for benzene extracting concentrated solution of residue wastewater

A technology for extracting raffinate and concentrating waste water, which is applied to chemical instruments and methods, water pollutants, ammonium sulfate, etc., can solve problems such as increased viscosity of concentrated liquid, large equipment corrosion, and difficulty in solid-liquid separation, so as to prevent Effects of polymerization and viscosity reduction

Inactive Publication Date: 2007-10-10
徐明光
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SO will be produced during combustion X and NO X , the former is highly corrosive to equipment, and the latter is prone to air pollution
If the benzene extraction raffinate wastewater concentrate is continuously evaporated and concentrated for crystallization, ammonium sulfate will be precipitated in the form of crystals while the water content is reduced, and the viscosity of the concentrate will rise sharply, resulting in difficulty in solid-liquid separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Take 500g of benzene extraction raffinate waste water concentrate, evaporate and concentrate under reduced pressure, and the system pressure is 0.45MP. The composition after concentration is 3.5% water, 52.5% ammonium sulfate, 44% caprolactam-containing organic matter, and the total weight is 466.5 g. Under stirring, 9.33 g of tert-butanol was added, and after full stirring, 235.7 g of ammonium sulfate crystals were obtained after the solid was dried, and 192.3 g of caprolactam-containing organic crystals were obtained from the liquid phase after removing water and recovering the solvent.

Embodiment 2

[0009] Take 500g of benzene extraction raffinate waste water concentrate by atmospheric evaporation and concentrate. The composition after concentration is 3.5% water, 52.5% ammonium sulfate, 44% caprolactam-containing organic matter, and the total weight is 466.5 g. 23.3 g of 1,4-dioxane was added under stirring, filtered after full stirring, 236.8 g of ammonium sulfate crystals were obtained after the solid was dried, and 192.6 g of caprolactam-containing organic crystals were obtained from the liquid phase after water removal and solvent recovery.

Embodiment 3

[0011] Take 1kg of benzene extraction raffinate waste water concentrate, evaporate and concentrate under reduced pressure, and the system pressure is 0.1MP. After concentration, the composition is 3.5% water, 52.5% ammonium sulfate, 44% caprolactam-containing organic matter, and the total weight is 933.5 g. 93.4 g of absolute ethanol was added under stirring, centrifuged after full stirring, 499.1 g of ammonium sulfate crystals were obtained after the solid was dried, and 383.1 g of caprolactam-containing organic crystals were obtained from the liquid phase after water removal and solvent recovery.

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Abstract

This invention relates to a method for comprehensive utilization of concentrated waste solution after benzene extraction. The method comprises: evaporating the concentrated waste solution, adding solvent to precipitate ammonium sulfate, performing solid-liquid separation to obtain ammonium sulfate crystals, distilling the separated liquid phase to recover solvent and remove water, and cooling to obtain organic crystals containing caprolactam.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of concentrated liquid of benzene extraction raffinate waste water, which is characterized in that the concentrated liquid is evaporated, then a solvent is added to precipitate ammonium sulfate, ammonium sulfate crystals are obtained by solid-liquid separation, and the separated liquid phase is distilled The solvent is recovered and water is removed, and after cooling, caprolactam-containing organic crystals are obtained. Background technique [0002] The benzene extraction raffinate waste water is a kind of waste water produced in the production of caprolactam, which contains 90% of water, and the rest is ammonium sulfate and a small amount of caprolactam and imidazoles. The conventional method is to concentrate to 10% water content, so as to form a benzene extraction raffinate waste water concentrate and then incinerate it. The calorific value of the concentrate is about 2000 kcal. To b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C01C1/24C07D201/16C02F101/16C02F101/38
Inventor 徐明光
Owner 徐明光
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