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Waste acid recovery

A technology of sulfuric acid and waste liquid, applied in the direction of sulfur trioxide/sulfuric acid, sulfur compounds, products, etc., to achieve the effect of reducing the amount of sulfuric acid and reducing the cost

Inactive Publication Date: 2001-04-25
WATERWORKS INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention provides a cost-effective and environmentally friendly method of purifying an aqueous solution of industrial sulfuric acid to produce a reusable acid product and solves the problems in disposal of sulfuric acid

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0066] Five sets of experiments were carried out on organic waste liquids containing different amounts of sulfuric acid. In the test, the organic waste liquid was fed into the freeze concentration equipment shown in Figure 8. During test operation, heat exchanger 406 cooled the refrigerant from an inlet temperature of 10-20°F to an outlet temperature of about 0-20°F. The cooled refrigerant is then pumped through crystallizer 404 to provide a crystallizer 404 inlet temperature of about 0-20°F and an outlet temperature of about 5-30°F. This cools the crystallizer 404 and the organic effluent passing through the crystallizer is cooled to an outlet temperature of about 45°F. The operating time of the test is approximately 4 hours.

[0067] Test No. 1 2 3 4 5 Feed 76．7 76．9 78．1 78．4 78．6 separated acid phase 87．7 87． 87．9 88．0 87．6 Test No. 1 2 3 4 5 Feed 6．7 6．7 6．7 7．4 7．4 separated acid phase 0．27 0．26 0．2...

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Abstract

A process for purifying a sulfuric acid solution such as by cooling a sulfuric acid solution to at or near its freezing point to form a slurry of a solid phase and a liquid phase. The slurry has an acid-rich region and an acid-poor region. The acid-rich region is separated from the acid-poor region on the basis of density.

Description

[0001] The disclosure of US Patent Application Serial No. 08 / 831,337, filed March 31, 1997, is hereby incorporated by reference. field of invention [0002] The present invention generally relates to a method for purifying sulfuric acid solution, in particular, relates to the process of purifying sulfuric acid aqueous solution by cooling sulfuric acid aqueous solution to a temperature close to its freezing point and separating the acid-rich and acid-poor regions produced Freeze Concentration. Background of the invention [0003] Treatment and disposal of wastewater from industrial production, especially acid-containing wastewater, is a long-standing problem in many industries. Acidic wastewater, also known as spent acid liquor, is a by-product of many manufacturing and refining processes. With ever-increasing disposal costs, environmental concerns associated with disposal of "hazardous" waste, and the urgent need to treat acid-containing wastewater. For example, many local...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90C01B17/92C02F1/22C02F1/38
CPCC02F1/38C01B17/905C02F1/22C01B17/92Y02P20/145C01B17/90
Inventor L·D·科南特A·科伊斯
Owner WATERWORKS INT
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