Process for producing bio-based product from straw hemicellulose and fully utilizing the components thereof

摘要

Provided is a process for producing biomass-based product from straw hemicellulose and utilizing the components thereof thoroughly. Steam-explosion and acid-hydrolysis are combined in the pre-treatment of straw in the process, thus a higher concentration of a sugar liquid can be obtained, and furfural and acetic acid can be recovered. The hemicellulose obtained by the pre-treatment can be used directly as ferment materials for producing butanol, succinic acid, butylene glycol, lactic acid, hydrogen and firedamp, which reduces the cost of these biomass-based products. The cellulose and lignin obtained by extracting the straw with an alkaline solution can produce products, such as sodium hydroxymethyl cellulose etc. In the process, all components in the straw can be utilized thoroughly and waste and pollutant will not be produced.

主权项

1. A process for producing a bio-based product from straw hemicellulose, comprising the steps of:
1) pretreating straw, wherein the straw is soaked in water, wherein a mass ratio of straw to water is from 1:1 to 1:3, a soaking temperature is from 15° C. to 90° C., and a soaking period is from 10 mins to 60 mins; 2) conducting steam explosion, wherein the straw soaked in step 1) is fed into a steam-explosion tank, and maintained under a steam-explosion pressure for a steam-explosion period; then a steam-exploded straw material is released, wherein a steam-explosion pressure is from 0.3 MPa to 2.0 MPa, and a pressure maintenance period is from 1 min to 10 mins; 3) performing an acid treatment, wherein the steam-exploded straw material obtained in step 2) is fed into an acid-hydrolysis tank pre-filled with a 0.8 to 1.6 wt % dilute acid and subjected to acid hydrolysis to generate a hydrolyzed material, wherein in the acid-hydrolysis tank, a mass ratio of the steam-exploded straw to the dilute acid is from 1:2 to 1:7, a reaction temperature is from 75° C. to 105° C., and a reaction time is from 10 mins to 60 mins; and 4) collecting the product thus obtained, wherein after the acid hydrolysis in step 3), the hydrolyzed material obtained in step 3) is filtered to generate a hydrolyzate liquid, and a hydrolysis residue is collected and extruded using an extruder to obtain a solid material.