System and method for continuously preparing furfural from acid-containing pentose solution

Abstract

The invention relates to a system and a method for continuously preparing furfural from an acid-containing pentose solution. The system comprises a stripping reactor, a separation unit and a purification unit. The method comprises a stripping reaction step, a separation step and a purification step. According to the system and the method, disclosed by the invention, a liquid inorganic acid can serve as a catalyst, the catalytic ability is high, the reaction temperature is low, and low-concentration liquid glucose can be treated. Direct stripping heating is performed by using steam, so that theproduced furfural is taken out in time along with the steam while a pentose reaction is carried out, and side reactions of the furfural in a liquid acidic environment are avoided. According to the system and the method, disclosed by the invention, any extraction agent is not needed in the reaction process, and the furfural taken along with the steam is easy to separate after cooling. The whole process design is reasonable, the furfural yield is high, and the unit energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of furfural production, in particular to the technology of continuously preparing furfural with an acid-containing pentose sugar solution in the two-step method for preparing furfural. Background technique [0002] Furfural (also known as furan formaldehyde) is an important chemical product, which is widely used in industrial fields such as synthetic plastics, medicine, and pesticides. The global demand for furfural is huge every year. Furfural can selectively extract unsaturated components from petroleum and vegetable oils, and can also extract aromatic components from lubricating oil and diesel oil. With the aggravation of the energy crisis and the requirement of environmental protection, more and more attention has been paid to the production of high value-added furfural from renewable agricultural and forestry wastes. [0003] At present, on an industrial scale, the only way to obtain furfural is still ...

AI Technical Summary

Problems solved by technology

The invention provides a system for continuously preparing furfural with an acid-containing pentose solution, and also provides a method for continuously preparing furfural with an acid-containing pentose solution, which at least solves the low yield of furfural in the prior art, There are many reaction by-products, high production cost, low production efficiency, serious environmental pollution and other problems, which can effectively increase the yield of furfural, avoid side reactions as much as possible, low unit energy consumption, and small environmental pollution

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