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Method and apparatus for removing and recycling organic phase in wastewater with distillation-free complete-molecular sieve

An organic phase and molecular sieve technology, applied in separation methods, chemical instruments and methods, water/sewage treatment, etc.

Inactive Publication Date: 2008-12-10
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since many organic phases can form binary azeotropes with water (see Figure 1), only organic-water homogeneous or heterogeneous azeotropes can be obtained by distillation or extraction

Method used

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  • Method and apparatus for removing and recycling organic phase in wastewater with distillation-free complete-molecular sieve
  • Method and apparatus for removing and recycling organic phase in wastewater with distillation-free complete-molecular sieve
  • Method and apparatus for removing and recycling organic phase in wastewater with distillation-free complete-molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) chloroform content 2% temperature is the waste water solution of 25 ℃, after gas stripping or decompression, obtain the chloroform vapor of 35 ℃;

[0025] (2) After the chloroform vapor obtained in step (1) is heated to 90°C, it is passed into the first-stage adsorption bed for adsorption treatment. The adsorption bed uses 1 kg of hydrophobic silica adsorbent, and the feed rate of the chloroform vapor is 20-200g / h, the adsorption time is 45 minutes; the high-concentration chloroform with a content of more than 95% adsorbed by the hydrophobic silicalite adsorbent is desorbed by decompression desorption, the desorption temperature is 110 ° C, and the desorption time is 40 minutes.

[0026] (3) Pass the high-concentration organic vapor obtained in step (2) through the 3A adsorption bed to remove a small amount of moisture therein, and finally obtain pure chloroform with a content of 99.0%.

Embodiment 2

[0028] (1) The waste water solution with 5% isopropanol content and a temperature of 20° C. is subjected to air stripping or decompression to obtain 40° C. isopropanol vapor;

[0029] (2) after the isopropanol vapor that step (1) is obtained is heated to 115 ℃, pass into the first-stage adsorption bed, carry out adsorption treatment, the adsorption bed uses 1 kilogram of hydrophobic silica adsorbent, the feeding amount of isopropanol vapor The adsorption time is 20-200g / h, and the adsorption time is 35 minutes; the high-concentration isopropanol with a hydrophobic silicalite adsorbent content greater than 95% is desorbed by decompression desorption, the desorption temperature is 130°C, and the desorption time for 50 minutes.

[0030] (3) Pass the high-concentration organic vapor obtained in step (2) through the 3A adsorption bed to remove a small amount of moisture therein, and finally obtain pure chloroform with a content of 99.2%.

Embodiment 3

[0032] (1) The ethyl acetate content 5% temperature is the waste water solution of 20 ℃, after air stripping or decompression, obtain the ethyl acetate vapor of 40 ℃;

[0033] (2) After the ethyl acetate steam that step (1) is obtained is heated to 110 ℃, pass into the first-stage adsorption bed, carry out adsorption treatment, the adsorption bed uses 1 kilogram of hydrophobic silica adsorbent, the feeding amount of ethyl acetate steam The adsorption time is 20-200g / h, and the adsorption time is 30 minutes; the high-concentration ethyl acetate with a content greater than 95% adsorbed by the hydrophobic silicalite adsorbent is desorbed by decompression desorption, the desorption temperature is 120°C, and the desorption time is for 45 minutes.

[0034] (3) Pass the high-concentration organic vapor obtained in step (2) through the 3A adsorption bed to remove a small amount of moisture therein, and finally obtain pure chloroform with a content of 99.4%.

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Abstract

The invention belongs to the environmental protection technical field, in particular relating to a recovery method and a recovery device for an organic solvent in wastewater. The recovery method has the following operation steps that: organic phase / water mixed steam above the wastewater containing the organic solvent is directly extracted, is heated, and then is passed through to a hydrophobic silicone zeolite adsorbent bed layer , an organic phase is absorbed by a hydrophobic adsorbent, and water is drained. Then a reduced pressure desorption or a carrier gas desorption mode is adopted to desorb the organic phase with high concentration absorbed by the hydrophobic silicone zeolite adsorbent to produce organic phase steam with a concentration more than 95 percent, and the steam is dried and dehydrated by a 3A molecular sieve or other drying agents to produce the organic phase with a concentration more than 99 percent. Compared with the prior batch distillation or extraction method, the method can realize the continuous production, and has simple equipment, small occupied area, high efficiency, low energy consumption, and wide application prospect on green environmental protection processes.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method and device for removing and recovering organic phases in waste water. Background technique [0002] Generally, waste water containing 1% to 5% organic phase is listed as a class of hazardous waste due to its volatile, flammable, toxic, corrosive or reactive characteristics, which has great impact on the environment. Hazardous. How to effectively and safely remove the organic phase in wastewater is particularly important. At the same time, because modern industrialization and urbanization have accelerated the pollution of the water environment, resulting in a shortage of water resources, wastewater recycling and reuse has become an important choice. With proper treatment and reuse, wastewater can be converted into a water resource that reduces the need for fresh water and reduces environmental pressure. [0003] Among the many waste organic...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F1/28C02F1/58B01D53/04
Inventor 郭娟龙英才陈筱诚
Owner FUDAN UNIV
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