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Furfural wastewater treatment method capable of generating acetone

A treatment method and furfural technology are applied in the fields of neutralizing water/sewage treatment, chemical instruments and methods, preparation of organic compounds, etc., which can solve problems such as poor treatment of low-concentration acetic acid, and achieve reduced treatment costs, considerable economic benefits, The effect of reducing environmental pollution

Inactive Publication Date: 2016-01-06
王志龙
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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 For 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 low-concentration calcium acetate waste liquid, utilize the second-effect evaporator to evaporate, evaporate and concentrate to 40% when the calcium acetate solid content 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 acetate is therm...

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Abstract

The invention relates to a furfural wastewater treatment method capable of generating acetone. The method comprises: I, adding an alkaline neutralizer into furfural wastewater for neutralizing reaction to generate calcium acetate: adding bulky, granular and powdery lime stones or lime into the furfural wastewater to neutralize acetic acid therein for reacting the furfural wastewater to generate calcium acetate; testing the pH value of low-concentration calcium acetate waste liquid and adding the lime stones or lime till the pH value is 7-8; II, separating calcium acetate: heating the waste liquid containing the low-concentration calcium acetate by aldehyde gas waste heat in a furfural production process for double-effect evaporation, evaporating and concentrating the waste liquid till the content of calcium acetate in the waste liquid is 30-40%, separating and dehydrating the waste liquid by virtue of a centrifugal machine or dehydrating the waste liquid by using a plate-and-frame filter press, and separating crystalline calcium acetate, wherein waste mother liquor is re-mixed with neutralized furfural waste liquid; and III, carrying out thermal decomposition on calcium acetate to obtain acetone: thermally decomposing the obtained calcium acetate in closed equipment, wherein the decomposing temperature is 140-160 DEG C, and the decomposer is calcium carbonate and acetone; and condensing acetone gas to be lower than 56 DEG C to obtain a liquid product acetone by virtue of a condenser.

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 prefer to 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 of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/08C07C45/54C02F1/66
Inventor 王志龙
Owner 王志龙
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