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Clean production line for furfural and production method of furfural

A clean production and assembly line technology, applied in the direction of organic chemistry, can solve problems such as poor recycling of wastewater, insufficient disclosure of treatment process parameters, and difficulty in guiding practice, achieving high yield, high purity, and low energy consumption.

Inactive Publication Date: 2015-12-30
SHANGHAI YIZHI INDAL
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Problems solved by technology

The invention does not fully disclose the treatment process parameters, it is difficult to guide the practice, and the waste water recycling is not good

Method used

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  • Clean production line for furfural and production method of furfural
  • Clean production line for furfural and production method of furfural

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Embodiment Construction

[0027] as attached figure 1 The furfural cleaning production line shown has process facilities for screening, crushing, acid mixing, hydrolysis, initial distillation, separation and rectification, and post-treatment facilities for waste gas, waste water and waste residue.

[0028] In the mixed acid process step, the concentrated sulfuric acid is made into 3~5% dilute sulfuric acid, which is evenly mixed with the raw material corn cob, and the raw material and dilute acid are added at the same time;

[0029] In the hydrolysis process step: according to the charging density of 0.18-0.2t / m3, put the corncobs mixed with acid into the hydrolysis pot, the whole hydrolysis time is 4-6 hours, the steam pressure in the hydrolysis pot is 0.5-1.0MPa, steam The temperature is 150-170°C, the azeotrope of aldehyde gas generated after the hydrolysis reaction is discharged from the top pipe, and the hydrolysis slag is discharged from the bottom of the hydrolysis pot for post-treatment.

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Abstract

The invention discloses a clean production line for furfural and a production method of the furfural. The clean production line comprises process facilities for sieving, crushing, acid preparation, hydrolysis, prefractionation, separation, rectification and the like and also further comprises treatment facilities for waste gas, wastewater and waste slag. The hydrolysis refers to charging corncobs mixed with acid to a hydrolysis pot at a charging density of 0.18 to 0.2t / m<3>, wherein the steam pressure is 0.5 to 1.0 MPa and the steam temperature is 140 to 180 DEG C in the hydrolysis pot; the tower top temperature is 94 to 97 DEG C and the tower bottom temperature is 98 to 108 DEG C in a prefractionation tower, furfural-containing water vapor is discharged from the tower top, and is condensed into liquid through a condenser, the liquid then enters a furfural separation tank to be subjected to water-furfural separation, and furfural liquid about 90 to 93% at the bottom automatically flows to a raw furfural tank. The clean production line disclosed by the invention can be used for scale processing of corncobs, and a separation effect of acetic acid and water can reach an international advanced level.

Description

technical field [0001] The invention relates to a production equipment and a production process flow for producing furfural solution from wastes of agricultural products. Background technique [0002] Furfural, also known as furan formaldehyde, is a colorless and transparent liquid with an almond-like smell, with a flash point of 60°C, a melting point of -36.5°C, and a boiling point of 161.7°C. Soluble in hot water, ethanol, ether and benzene, it will gradually turn yellow to brown when oxidized in the air. [0003] At present, my country's furfural production mainly uses corncobs as raw materials and sulfuric acid as a catalyst for production in one step. The production of furfural adopts a pressurized hydrolysis production process. The main process includes: cleaning, raw material crushing, acid mixing, hydrolysis, condensation, initial distillation, separation and rectification. [0004] However, the yield and the treatment of three wastes need to be improved. [0005]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/50
CPCC07D307/50
Inventor 仇晓丰奚儒伟赵桂花
Owner SHANGHAI YIZHI INDAL
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