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Method for reducing sewage discharge in washed method

A technology of sewage discharge and water washing tower, which is applied in the direction of chemical methods, chemical instruments and methods, and chemical/physical processes that make liquids react with non-granular solids, and can solve sewage and other problems and achieve the effect of reducing emissions

Active Publication Date: 2012-08-08
上海汇友精密化学品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the current industrial technology production, a small amount of water-soluble gas is often left in the water-insoluble gas products (such as most organic gases) obtained by chemical reaction, see figure 1 , the usual method is to pass through the water washing tower 1, the gas product passes through the water washing tower 1 from bottom to top, and the water is sprayed from the water washing tower from top to bottom, so as to absorb a small amount of water-soluble gas in the gas product, and the washed water is directly processed discharge, often producing a large amount of sewage

Method used

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  • Method for reducing sewage discharge in washed method
  • Method for reducing sewage discharge in washed method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The organic gas product contains a small amount of water-soluble gas hydrogen fluoride, which is first passed through the first water washing tower 1 to dissolve the hydrogen fluoride in water and separate it from the organic product. Then the water dissolved in hydrogen fluoride is passed through another absorption tower 2, which contains potassium hydroxide solid, and the hydrogen fluoride and potassium hydroxide dissolved in water are neutralized in the tower, and the resulting potassium fluoride solution An aqueous solution of potassium fluoride was obtained in water. The solution is distilled or spray-dried to obtain solid potassium fluoride, which can be used instead of industrial potassium fluoride, and the distilled water can be returned to the first water washing tower 1 for recycling to absorb water-soluble of hydrogen fluoride. The reaction equation is as follows:

[0026] HF+KOH=KF+H 2 o

Embodiment 2

[0028] The organic gas product contains a small amount of water-soluble gas hydrogen fluoride, which is first passed through the first water washing tower 1 to dissolve the hydrogen fluoride in water and separate it from the organic product. Then the water dissolved in hydrogen fluoride is passed through another absorption tower 2, which contains sodium hydroxide solid, and the hydrogen fluoride and sodium hydroxide dissolved in water carry out neutralization reaction in the tower, and the sodium fluoride generated is difficult to absorb. Dissolved in water to obtain solid sodium fluoride and return water. The sodium fluoride solid in the absorption tower is regularly removed, and this solid can be used instead of industrial sodium fluoride, and the obtained return water can be returned to the first water washing tower 1 for recycling to absorb water-soluble hydrogen fluoride in the organic gas. The reaction equation is as follows:

[0029] HF+NaOH=NaF+H 2 o

Embodiment 3

[0031] The organic gas product contains a small amount of water-soluble gas hydrogen fluoride, which is first passed through the first water washing tower 1 to dissolve the hydrogen fluoride in water and separate it from the organic product. Then the water dissolved in hydrogen fluoride is passed through another absorption tower 2. There is calcium hydroxide solid in this absorption tower 2. The hydrogen fluoride and calcium hydroxide dissolved in water are neutralized in the tower, and the calcium fluoride generated is difficult to absorb. Soluble in water to obtain solid calcium fluoride and return water. Regularly remove the calcium fluoride solids in the absorption tower, which can be used instead of industrial calcium fluoride, and the obtained return water can be returned to the first water washing tower 1, and circulated to absorb water-soluble hydrogen fluoride in the organic gas. The reaction equation is as follows:

[0032] 2HF+Ca(OH) 2 =CaF 2 +2H 2 o

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Abstract

The invention discloses a method for reducing sewage discharge in a washed method. Washing water after washing of a washing tower flows into at least one absorption tower filled with gas absorbent material; gas in the washing water is absorbed to obtain absorbate, and water after absorption is returned to the washing tower for cycle use. The gas absorbent material absorbs the gas to obtain a subsidiary product with economic value. A reservoir is additionally arranged between the absorption tower and the washing tower, and the capacity of the reservoir is large enough for storing water for the continuous use of the washing tower. In the invention, the water flowing out from the washing tower flows into the absorption tower filled with little gas absorbent material, gas dissolving in the water is absorbed through the absorption tower, and obtained water is again returned to the washing tower for cycle use. The subsidiary product obtained after washing water is absorbed through the absorption tower, can be reused and has economic value.

Description

technical field [0001] The invention relates to a method for reducing sewage discharge by water washing. Suitable for water-insoluble gas products or with a small amount of water-soluble gas products to remove a small amount of water-soluble gas products in the industrial production of continuous water washing. Background technique [0002] In the current industrial technology production, a small amount of water-soluble gas is often left in the water-insoluble gas products (such as most organic gases) obtained by chemical reaction, see figure 1 , the usual method is to pass through the water washing tower 1, the gas product passes through the water washing tower 1 from bottom to top, and the water is sprayed from the water washing tower from top to bottom, so as to absorb a small amount of water-soluble gas in the gas product, and the washed water is directly processed Discharge often produces a large amount of sewage. [0003] With the development of society and economy t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14B01J16/00
Inventor 俞伯洪贾颂今朱小兵
Owner 上海汇友精密化学品有限公司