Novel environmentally-friendly production process for furfural

Abstract

The invention discloses a production method of furfural, and particularly a novel environmentally-friendly production process for furfural. The method comprises process steps, namely smashing raw materials, adding diluted acid for stirring, exchanging heat and distilling, exchanging heat, dehydrogenating and washing with water, distilling, exchanging heat, discharging a finished product and the like. The process has the advantages that a small amount of waste water is produced in a production process, environmental protection is facilitated, the amount of vapor is reduced, the hydrolyzation time is shortened, the yield is high, the washing process of the finished product is free from neutralization, sodium bicarbonate is saved, the labor intensity of staffs is lowered, waste gas and dust are not produced in the production process, and the like.

Description

technical field [0001] The invention discloses a furfural production method, specifically a new furfural green production process. Background technique [0002] Furfural is an important organic chemical raw material obtained by hydrolysis of wood and agricultural by-products. It is widely used in synthetic resin, medicine, dye, petrochemical and light chemical industries. In the past 20 years, with the increasing demand for furfural in chemical production, furfural and some of its derivatives are indispensable in many aspects of industrial production, but currently it cannot be obtained through petrochemical methods, so it will be combined with other The industry is constantly moving forward. [0003] At present, furfural is mainly produced by one-step method, and the maximum yield of furfural in this method is only 60%, and the raw materials are not fully utilized, which is the main factor restricting the development of furfural industry at present. In addition, a large a...

AI Technical Summary

Problems solved by technology

[0005] ①. The original process produces a large amount of wastewater

[0006] ②, low output

High energy consumption and high cost

[0007] ③. The hydrolysis process is complicated and the amount of acid used is large

[0009] The treatment method for acid in furfural in our country is to use 5% lye to neutralize with intermittent stirring, that is, the loss of 9.6kg per ton of crude aldehyde (85-90% aldehyde content) in the neutralization process is 0.96% of crude aldehyde The water content of crude aldehyde is 8%, and this water layer contains 8% of aldehyde. In the refining process, 6.4kg of furfural is taken away per ton, accounting for 0.64% of furfural; the process of neutralizing crude aldehyde with alkali produces sodium acetate and neutralized gross aldehyde Together into the refining equipment, the loss of furfural is more than 3.34%; due to the generation of sodium acetate, the loss of furfural is more than 2%.

[0010] Dehydrogenation is very important for the production of furfural. Most furfural factories in my country use full condensers, and the condensation cooling temperature is low, and methanol is not discharged. The more methanol is in the system, it will affect the normal operation of the initial distillation tower and affect the phase separator. Stratification effect, so that periodic turbidity will appear in the phase separator, and aldehydes cannot be separated. If no measures are taken, a large amount of furfural will run away from the bottom of the initial distillation tower

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