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Method for treating wastewater from furfural production

A technology for producing wastewater and treatment methods, which is applied in water/sewage treatment, heating water/sewage treatment, water/sludge/sewage treatment, etc., and can solve the problems of large investment in wastewater treatment facilities, difficulty in meeting sewage standards, and high operating costs. Achieve the effect of small footprint, easy operation and saving of sewage charges

Inactive Publication Date: 2006-12-06
JINAN SHENGQUAN GRP SHARE HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a new method for treating process wastewater in furfural production to solve the problems of large investment in wastewater treatment facilities in furfural production, high operating costs, difficulty in reaching the standard for treated sewage, and easy to cause secondary pollution.

Method used

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  • Method for treating wastewater from furfural production
  • Method for treating wastewater from furfural production
  • Method for treating wastewater from furfural production

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The raw material is corncobs air-dried in spring, and its water content is 23%. After the corncob is dedusted by a vibrating screen, it is crushed into 1-1.5cm corncob particles by a hammer mill, and then transported by the elevator to the acid mixing truck for acid mixing. The acid concentration is 5-10%, and the amount of acid used is kept at With a specific solid-to-liquid ratio, it is sent to the hydrolysis kettle through a belt conveyor. The volume of the hydrolysis kettle is 10 cubic meters. It is operated in series with two kettles. The temperature is 145-180°C, and the hydrolysis takes 2 hours to 4 hours. The furfural stock solution obtained by hydrolysis is introduced into the subsequent process, and the gross aldehyde is extracted, and the furfural is continuously refined to obtain commercial furfural. The wastewater at the bottom of the furfural tower goes to the sewage station for treatment through the wastewater pipeline, and the treatment method adopts th...

Embodiment 2

[0046] The raw material is corncobs air-dried in spring, and its water content is 23%. After the corncob is dedusted by a vibrating screen, it is crushed into 1-1.5cm corncob particles by a hammer mill, and then transported by the elevator to the acid mixing truck for acid mixing. The acid concentration is 5-10%, and the amount of acid used is kept at With a specific solid-to-liquid ratio, it is sent to the hydrolysis kettle through a belt conveyor. The volume of the hydrolysis kettle is 10 cubic meters. It is operated in series with two kettles. Secondary steam, the hydrolysis temperature is 145-180°C, and the hydrolysis takes 1 hour, 45 minutes to 3.5 hours. The furfural stock solution obtained by hydrolysis is introduced into the subsequent process, and the gross aldehyde is extracted, and the furfural is continuously refined to obtain commercial furfural. Wastewater treatment adopts the method of the present invention. The material of the evaporation system equipment is 1...

Embodiment 3

[0048] The raw material is corncobs air-dried in spring, and its water content is 23%. After the corncob is dedusted by a vibrating screen, it is crushed into 1-1.5cm corncob particles by a hammer mill, and then transported by the elevator to the acid mixing truck for acid mixing. The acid concentration is 5-10%, and the amount of acid used is kept at With a specific solid-to-liquid ratio, it is sent to the hydrolysis kettle through a belt conveyor. The volume of the hydrolysis kettle is 10 cubic meters. It is operated in series with two kettles. Secondary steam, the hydrolysis temperature is 145-180°C, and the hydrolysis takes 1 hour, 45 minutes to 3.5 hours. The furfural stock solution obtained by hydrolysis is introduced into the subsequent process, and the gross aldehyde is extracted, and the furfural is continuously refined to obtain commercial furfural. Wastewater treatment adopts the method of the present invention, the material of the evaporation system equipment is 1...

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Abstract

This invention relates to a method a method for treating organic acidic wastewater from furfural production. The method comprises: (1) precipitating the wastewater, and pumping into a wastewater-evaporating system; (2) performing heat exchange with a primary steam to produce a secondary steam that is used for hydrolysis and taking out furfural; (3) introducing the primary steam into a vapor-water separator; (4) introducing steam condensing water from the vapor-water separator and the steam buffering tank into a steam expanding tank, and utilizing the low-pressure steam and condensing water from the steam expanding tank; (5) recycling evaporated residual liquid in the evaporating system, and combusting the precipitates and suspending matters in the precipitating tank. The method has such advantages as low equipment investment, low operation cost, and little secondary pollution. This invention makes full use of available components in furfural production wastewater under the condition of no effect on furfural yield, thus realizing zero wastewater discharge in furfural production process.

Description

technical field [0001] The invention relates to the field of organic acid waste water treatment in industrial production, in particular to a treatment method for furfural production waste water. Background technique [0002] The furfural production process mostly adopts the direct method, the catalyst uses sulfuric acid, and most of the raw materials use corncobs, and some also use crop wastes such as corn stalks, cotton stalks, cottonseed hulls, and bagasse. Usually, the raw materials are pulverized with a pulverizer and then added with dilute sulfuric acid, stirred and mixed evenly with an acid mixer, then sent into the hydrolysis pot, and steam is introduced from the bottom of the hydrolysis pot, and the furfural obtained by hydrolysis is taken out of the hydrolysis pot by steam to form aldehyde vapor. Aldehyde vapor is condensed to form a stock solution, and the stock solution enters the distillation tower for distillation. The azeotrope of furfural and water is evaporat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/52C02F1/04C07D307/48C07D307/50
CPCB01D3/322C02F1/048C07D307/50B01D3/143
Inventor 唐一林江成真高绍丰吕东生沈祖江索炫伟
Owner JINAN SHENGQUAN GRP SHARE HLDG CO LTD
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