Furfural five-tower continuous rectification process

Abstract

The invention discloses a furfural five-tower continuous rectification process, and relates to the field of furfural rectification, and the furfural five-tower continuous rectification process comprises the following steps: step 1, preparing aldehyde steam from corncobs, and pretreating the aldehyde steam; 2, carrying out five-tower continuous rectification refining; and 3, performing furfural wastewater treatment. Aldehyde steam is prepared from corncobs, the aldehyde steam is pretreated, superheated steam loaded with a vapor-state acid catalyst is introduced into a stirring kettle, the superheated steam is recycled, and the furfural concentration in mixed gas is condensed, so that the furfural concentration in a furfural aqueous solution is increased, further refining is facilitated, thefurfural purification effect is better, and the furfural purification energy consumption is effectively reduced.

Description

technical field [0001] The invention relates to the field of furfural rectification, in particular to a furfural five-tower continuous rectification process. Background technique [0002] Furfural, also known as 2-furfuraldehyde, is the same substance as furfural. Its scientific name is α-furfuraldehyde. It is a derivative in which the hydrogen atom at the 2-position of furan is replaced by an aldehyde group. It is initially obtained from rice bran and dilute acid. It is produced, so it is called furfural. Furfural is formed by hydrolysis of pentosan under the action of acid to generate pentose, and then dehydration and cyclization of pentose. The main raw materials for production are agricultural and sideline products such as corncobs. There are many synthetic methods. Furfural is the most important derivative of the furan ring system. It is chemically active and can produce numerous derivatives through oxidation and condensation reactions. It is widely used in synthetic pl...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is: in order to solve the problem that the furfural concentration in the furfural distillate prepared by lignocellulosic raw materials is very thin, and contains a small amount of acetic acid components. To obtain higher-precision furfural, it is necessary to increase multiple distillation towers, the production process is loaded down with trivial details, and equipment investment Large, high energy consumption. In addition, acetic acid is easy to react with furfural to form resin, which reduces the yield of furfural and will block the equipment. If the acetic acid is first neutralized and then distilled, acetic acid will not be obtained, which will reduce the production value. Due to the high energy consumption of the production equipment, the economic investment is relatively high, and the waste water discharged from the initial distillation tower cannot be used. After being treated, it is directly discharged, which will cause a large waste. A furfural five-tower continuous rectification process is provided.