Acetone-generating method for treating furfural wastewater

A technology for wastewater treatment and furfural, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of difficult treatment of acetic acid, reduce treatment costs, reduce COD load, and reduce environmental pollution.

Inactive Publication Date: 2015-12-30
高嵩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for treating furfural wastewater with the ability to produce 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

[0012] 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;

[0013] 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;

[0014] 3. Calcium acetate is thermally decomposed to obtain acetone: ...

Embodiment 2

[0016] 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;

[0017] 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;

[0018] 3. Calcium acetate is thermally decomposed to obtain acetone: the obtained calcium acetate is thermally deco...

Embodiment 3

[0020] 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 For the pH value of the calcium waste liquid, add limestone until the pH value is 7-8;

[0021] 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;

[0022] 3. Calcium acetate is thermally decomposed to obtain acetone: the obtained calcium ...

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PUM

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Abstract

The invention discloses an acetone-generating method for treating furfural wastewater. The method includes the steps that 1, antalkalies are added into the furfural wastewater, and a neutral reaction is carried out to generate calcium acetate, wherein blocky or granular or powdery limestone or lime is added into the furfural wastewater to neutralize acetic acid in the furfural wastewater, the limestone or the lime is reacted with the acetic acid to generate the calcium acetate, the pH value of the waste liquid with the low-concentration calcium acetate is measured, and limestone or lime is added till the pH value ranges from 7 to 8; 2, the calcium acetate is separated, wherein the waste liquid with the low-concentration calcium acetate is heated through waste heat of aldehyde gas generated in the furfural production process, double-effect evaporation is carried out, the waste liquid is evaporated and concentrated, when the content of the calcium acetate in the waste liquid ranges from 30% to 40%, separating and dewatering are carried out through a centrifugal machine or dewatering is carried out through a plate-and-frame filter press, the crystallized calcium acetate is separated, and waste mother liquid is remixed with the neutralized furfural waste liquid; 3, the calcium acetate is thermally decomposed to obtain acetone, wherein the obtained calcium acetate is thermally decomposed in a closed device, the decomposing temperature ranges from 140 DEG C to 160 DEG C, the decomposing products are calcium carbonate and the acetone, the gas acetone is condensed to the temperature lower than 56 DEG C through a condenser, and a liquid acetone product is obtained.

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 / lCOD 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): C07C45/54C07C49/08
Inventor 高嵩
Owner 高嵩
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