A kind of technology that utilizes xylose mother liquor to prepare furfural

Abstract

The invention belongs to the technical field of furfural preparation, in particular to a process for preparing furfural by using xylose mother liquor. The process includes the following steps: 1) Impurity removal: adding water to the xylose mother liquor to prepare a sugar content of 10%-20%, adding saccharomyces cerevisiae and peptone for fermentation to remove glucose and galactose. 2) The fermented liquid is filtered out with a microfiltration membrane to remove bacteria; then the ultrafiltration membrane is used to remove protein macromolecular impurities, and the obtained ultrafiltrate is concentrated with a reverse osmosis membrane; 3) Take the xylose mixed solution, catalyst and polymerization inhibitor according to the The ratio continuously enters the liquid-liquid mixer, and at the same time, the solvent is added for mixing and then injected into the preheater, and then enters the tubular reactor after being heated by the preheater; the reactant stays in the tubular reactor for a period of time and then enters the reaction extraction tower to continue the reaction to form Furfural and more. The process makes full use of raw materials in the production process of furfural, reduces steam consumption, saves energy; no waste material is discharged, and cost is reduced, so that the conversion rate of xylose in xylose mother liquor to furfural can reach more than 95%.

Description

Technical field[0001]The present invention belongs to the technical field of furfural preparation, and is specifically a process for preparing furdehyde by xylose.Background technique[0002]Furfural is an important foundation organic chemical raw material that is still unable to synthesize chemical methods. It is the only unsaturated large proportional organic chemical obtained from the sugar compound, and its chemical properties are very lively, furfural and its Derivatives are extensive organic chemical intermediates. In addition, furfural can also produce 5-hydroxymethyl furfural, or as a raw material, the methyl tetrahydrofuran produced by the furfural by hydrogenation can be directly used as gasoline. Binder. With the growing energy crisis and environmental problems worldwide, the demand for furfural field will continue to grow. However, the existing furfural production has a huge energy consumption, the environmental pollution is extremely serious, the production cost is high a...

AI Technical Summary

Problems solved by technology

[0008] There are many disadvantages in the existing furfural production process: First, the yield problem. At present, about 70% of furfural production enterprises in the world use batch reactors, and the furfural yield is only about 50% of the theoretical value, but the steam consumption is 30-50 times of furfural output, and the reaction time is longer

There are many side reactions in the existing catalytic system. Water phase, strong acid, high temperature, contact with oxygen, long reaction time, etc. will lead to condensation and resinization of furfural. Interaction polymerization occurs, and furfural will be further degraded to generate aceguvaldehyde, formaldehyde, glyceraldehyde, glycolaldehyde, etc. These side reactions will reduce the selectivity of pentose to furfural

Secondly, dilute acid is easy to corrode equipment, and its separation and recycling are very difficult, and dilute acid hydrolysis will also lead to a large amount of acidic furfural wastewater, which is extremely difficult to treat

Again, the use of steam as a heat source and extractant is energy intensive, so one would like to solve the above problems

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