Furfural waste water disposal method capable of producing acetone

A wastewater treatment and furfural technology, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of low-concentration acetic acid that is not easy to handle, and achieve reduced treatment costs and considerable economic benefits , the effect of reducing environmental pollution

Inactive Publication Date: 2006-04-26
杨正学 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a treatment method for furfural wastewater capable of producing acetone to solve the problem that low-concentration acetic acid in furfural wastewater is not easy to handle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1. Add an alkaline neutralizer to the furfural wastewater, and perform a neutralization reaction to generate calcium acetate: add massive limestone to the furfural waste liquid, neutralize the acetic acid in it, and make it react to generate calcium acetate, which is measured to contain a low concentration For the pH value of the calcium acetate waste liquid, add limestone until the pH value is 7-8;

[0012] 2. Separation of calcium acetate: use the waste heat of aldehyde gas produced in the furfural production process to heat the waste liquid containing low concentration of calcium acetate, use the second-effect evaporator to evaporate, evaporate and concentrate until the calcium acetate content in the waste liquid is 30%, and use centrifugation Machine separation and dehydration, separation of crystalline calcium acetate, and re-mixing of waste mother liquor with neutralized furfural waste liquor;

[0013] 3. Calcium acetate is thermally decomposed to obtain acetone: ...

Embodiment 2

[0015] 1. Add an alkaline neutralizer to the furfural wastewater, and perform a neutralization reaction to generate calcium acetate: add lime to the furfural waste liquid, neutralize the acetic acid in it, and make it react to generate calcium acetate, which contains low concentration calcium acetate. For the pH value of the waste liquid, add lime until the pH value is 7-8;

[0016] 2. Separation of calcium acetate: use the waste heat of aldehyde gas produced in the production process of furfural to heat the waste liquid containing low concentration calcium acetate, use the second-effect evaporator to evaporate, evaporate and concentrate until the content of calcium acetate in the waste liquid is 35%, and dilute the acetic acid The calcium crystallization liquid is air-dried, and the waste mother liquid is mixed with the neutralized furfural waste liquid again;

[0017] 3. Calcium acetate is thermally decomposed to obtain acetone: the obtained calcium acetate is thermally deco...

Embodiment 3

[0019] 1. Add an alkaline neutralizer to the furfural wastewater, and perform a neutralization reaction to generate calcium acetate: add granular limestone to the furfural waste liquid, neutralize the acetic acid in it, and make it react to generate calcium acetate, which contains low concentration of acetic acid The pH value of the calcium waste liquid, add limestone until the pH value is 7-8;

[0020] 2. Separation of calcium acetate: use the waste heat of aldehyde gas produced in the furfural production process to heat the waste liquid containing low-concentration calcium acetate, utilize a second-effect evaporator to evaporate, and evaporate and concentrate to 40% when the solid content of calcium acetate in the waste liquid is 40%. The calcium acetate crystallization solution is spray-dried, and the waste mother liquor is mixed with the neutralized furfural waste liquor again;

[0021] 3. Calcium acetate is thermally decomposed to obtain acetone: the obtained calcium acet...

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Abstract

The furfural waste water treating process capable of producing acetone belongs to the field of environment protecting technology. The furfural waste water treating process includes the following steps: 1. adding alkaline neutralizing agent into furfural waste water to produce neutralization forming calcium acetate; 2. separating calcium acetate; and 3. decomposing thermally to obtain acetone. The present invention has the advantages cheap neutralizing agent of calcium carbonate, calcium oxide or calcium hydroxide, and greatly lowered COD load of treated waste water, and obvious economic utility.

Description

technical field [0001] The invention belongs to a treatment method for furfural wastewater and belongs to the field of environmental protection. Background technique [0002] Furfural is an important chemical raw material for basic organic synthesis. During the production process, a large amount of waste water, waste gas, and waste residue are produced, which seriously pollutes the environment. Due to the serious environmental pollution caused by furfural production, some economically developed countries in the world would rather pay high prices to transfer the pollution to the environment, and transfer their pollution to underdeveloped countries. [0003] The wastewater produced by furfural production has a large discharge volume, high temperature, low pH value, 1-2.5% acetic acid content, and a high pollutant concentration of 15000mg / l COD cr . The governance process is complex and difficult. Most of the biochemical methods and physicochemical methods are used, and most...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/08C02F1/58C07C45/51
Inventor 杨正学杨文力刘险峰孙文田遇莹
Owner 杨正学
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