Furfural hydrolysis method

Abstract

The invention discloses a furfural hydrolysis method which comprises the following steps: S1, fully mixing screened and crushed corncobs and dilute sulphuric acid according to a certain proportion, and putting the mixture into a reaction container; S2, introducing steam from the bottom of the reaction container in S1 for hydrolysis, and controlling certain pressure and temperature; and S3, adding a certain amount of a polymerization inhibitor, and after hydrolysis reaction for a certain time, condensing a generated water vapor mixture to obtain a furfural stock solution. The method overcomes the defects in the prior art, is reasonable in design, reduces the loss caused by furfural polymerization in the hydrolysis process by increasing the hydrolysis reaction temperature, increasing the solid-to-liquid ratio, shortening the hydrolysis time and adding a certain amount of thiourea as a polymerization inhibitor, improves the furfural yield, reduces the steam consumption, and has higher social use value and application prospect.

Description

technical field [0001] The invention relates to the technical field of furfural hydrolysis, in particular to a furfural hydrolysis method. Background technique [0002] The scientific name of furfural is α-furfuraldehyde, and its molecular formula is C 4 h 3 O·CHO is an important organic chemical raw material and chemical solvent widely used in petroleum industry, chemical industry, medicine, food, synthetic rubber, synthetic resin and other industries. There are more than 1600 chemical products synthesized directly and indirectly with it, including Furfuryl alcohol, maleic anhydride, tetrahydrofuran, furan resin, furfural resin, furfuryl ketone resin, etc. The production of furfural is based on the fiber containing pentosan as the raw material, which is first hydrolyzed to obtain pentose and then dehydrated and cyclized. The reverse process is as follows: [0003] The hydrolysis of pentosan to generate pentose reaction formula: [0004] [0005] Dehydration of pentos...

AI Technical Summary

Problems solved by technology

The efficiency of the single-stage CSTR reactor is low, and the consumption of extractant is large; the Scheibel tower improves the extraction efficiency to a certain extent, but because the phase separation section in the tower still maintains the reaction temperature, this makes the furfural generated in the water phase have serious side reactions

[0010] Chinese patent CN104387346B discloses a method for preparing furfural by multistage continuous countercurrent reaction extraction of pentose, which uses 2-isobutylphenol, 2,4-dichlorotoluene, benzyl benzoate or o-trimethylbenzene as extractant , through multi-stage extraction, thereby producing furfural, although the conversion rate of pentose sugar and furfural yield have been improved to a certain extent, but the multi-stage reaction extraction, the process flow is long, the energy consumption is large, and chlorination is added in the production process Iron, ferric sulfate or ferric nitrate are used as additives, which will undoubtedly increase waste residue and increase production costs

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