Automatic acidless continuous furfural hydrolysis system

Abstract

The invention discloses an automatic acidless continuous furfural hydrolysis system. The system comprises a feeding system, a hydrolysis unit and a residue treating unit, wherein the residue treating unit consists of a solid-liquid separation unit and a stock solution storage tank, and a secondary steam generator is arranged between the hydrolysis unit and the solid-liquid separation unit; and the solid-liquid separation unit consists of a furfural residue separator, a self evaporator, a hydrocyclone separator, a conveyor belt and a rotary slag tapping device. Compared with the prior art, the automatic acidless continuous furfural hydrolysis system has the advantages of having no added acid and continuous hydrolysis, being higher in automation level, and having higher steam utilization ratio due to addition of the secondary steam generator; and the use of a stirring device additionally arranged improves the raw material utilization ratio, thus leading the reaction of the raw materials to be more full, reducing and properly treating the acid content of residue, improving the yield of the hydrolyzed furfural, lowering the production cost and being more environment-friendly.

Description

technical field [0001] The invention belongs to the field of furfural production and preparation, in particular to an acid-free continuous automatic hydrolysis system for furfural. Background technique [0002] Furfural, also known as furan formaldehyde, has two double bonds and an aldehyde group on the furan ring. This unique chemical structure can make it undergo oxidation, hydrogenation, chlorination, nitration and condensation reactions to produce many chemical products. , so it is widely used in many production fields such as pesticides, pharmaceuticals, petrochemicals, food additives, and casting. [0003] Furfural is produced from plant fibers rich in pentosans, such as corn cobs, bagasse, straw, corn stalks, cottonseed hulls, rice husks, etc. The principle is that pentosans in plant fibers are first hydrolyzed into pentosans sugar, followed by dehydration of pentose sugars to furfural. [0004] The traditional method of producing furfural is to adopt a hydrolysis t...

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Problems solved by technology

[0005] 1. Only one hydrolysis reactor is used for reaction, which may cause incomplete reaction of raw materials, low furfural yield and low comprehensive utilization rate

[0006] 2. Adding external acid as a catalyst requires mixing acid aqueous solution at high temperature, even highly corrosion-resistant alloy steel will undergo severe corrosion, and the production cost is high

[0007] 3. The intermittent production method consumes a lot of steam, and produces a large amount of waste liquid and waste residue, which is difficult to deal with in time, which is not conducive to improving productivity and environmental protection

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