Method for producing furfural by aid of pre-hydrolysis liquid of eucalyptus
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A technology of pre-hydrolyzed solution and eucalyptus, which is applied in the direction of organic chemistry, can solve the problems of waste of biomass resources, increase the amount of alkali used for cooking, etc., and achieve the effect of improving utilization rate, increasing furfural yield, and reducing coking reaction
Inactive Publication Date: 2016-05-11
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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If the waste liquid enters the subsequent cooking section directly with the wood chips according to the traditiona...
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Embodiment 1
[0050] Example 1 Effect of eucalyptus prehydrolysis conditions on hemicellulose extraction.
[0051] Method 1: Wash the eucalyptus chips in water at 60°C and steam them for 30 minutes, use a double-screw extruder to crush and tear the eucalyptus chips, grind them and place them in a digester (US M / K609-2- 10 type digester), add water, the liquid-solid ratio is 12:1, heat up to 170°C, the heating rate is 2°C / min, and then keep warm for pre-hydrolysis, wherein the hold time is 60min, to obtain eucalyptus pre-hydrolysis Hydrolyzate.
[0052] Method 2: The eucalyptus wood pre-hydrolyzate is prepared by the steps similar to the above method 1, the difference is that the eucalyptus wood chips are steamed, double-screw extruded and ground without being washed in water.
[0053] The liquid-solid ratio, hydrolysis reaction time and reaction temperature of the two methods were changed respectively to investigate the effect of each influencing factor on the extraction effect of hemicell...
Embodiment 2
[0063] The preparation of embodiment 2 furfural.
[0064] The variety of eucalyptus wood chips is an improved variety of Congo No. 12 eucalyptus, which is obtained from a pulp company in Guangxi. Using method 1 in Example 1, eucalyptus wood chips were prepared under the conditions of a temperature of 170 ° C, a holding time of 60 min, and a liquid-solid ratio of 5:1. The hydrolyzed waste liquid was stored in cold storage for later use. The pH value of the waste liquid was 3.11, and the contents of solids, xylose and xylo-oligosaccharides were 40.45g / L, 14.11g / L and 3.43g / L respectively.
[0065] The experimental steps are:
[0066] (1) Check the airtightness of the autoclave before the test, and use it after confirming that there is no leakage;
[0067] (2) Eucalyptus prehydrolyzate and sulfuric acid catalyst are added in the reaction kettle, the lid of the kettle is tightened, the power is turned on, the condensed water is turned on, and the temperature starts to rise after ...
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Abstract
The invention discloses a method for producing furfural by the aid of pre-hydrolysis liquid of eucalyptus. The method includes steps of (1), washing eucalyptus chips, then steaming the eucalyptus chips by the aid of steam, squeezing, grinding and tearing the eucalyptus chips by the aid of double-screw squeezing fluffers, arranging the ground eucalyptus chips in cooking vessels, adding water into the cooking vessels and carrying out hydrolysis on the eucalyptus chips to obtain the pre-hydrolysis liquid of the eucalyptus; (2), carrying out reaction on the pre-hydrolysis liquid of the eucalyptus and sulfuric acid to obtain the furfural. The pentose extraction rate can reach the maximum value of 57.51% under preferable conditions, and the furfural yield can reach the maximum value of 71.89% under the technical conditions that the temperature is 180 DEG C, the concentration of H2SO4 is 0.25%, the gas extraction speed is 15 mL/min and the concentration of xylose is 17.8 g/L. The method has the advantages that the pre-hydrolysis liquid of the eucalyptus is reasonably utilized for preparing the furfural, the eucalyptus is subjected to screw squeezing and grinding pre-treatment, and accordingly the utilization rate of the eucalyptus in late-phase reaction can be increased; preparation processes are adjusted, so that the pre-hydrolysis liquid does not contain fiber polysaccharides such as cellobiose and cellotriose, pyrogenic reaction can be reduced, and the furfural yield can be effectively increased.
Description
technical field [0001] The invention belongs to the field of furfural production technology, and in particular relates to a method for producing furfural by using eucalyptus wood prehydrolyzate. Background technique [0002] Eucalyptus is one of the fast-growing tree species with the largest amount of artificial planting in my country, and it is a tree species with a high hemi-fiber content, which can reach 20% to 25%, up to 35%. Its main chain is composed of D-xylopyranosyl (1-4) β-glycosidic bonds, and the branch chain has acetyl and 4-O-methyl-α-D-glucopyranosyl. Wait. Using the low acid produced by the high temperature water environment to promote the self-catalytic hydrolysis of eucalyptus hemicellulose without chemicals is an environmentally friendly green technology. For woody biomass raw materials, pre-extraction of hemicellulose before pulping is of great significance for the realization of forest-based biomass refining, and the process of producing dissolving pul...
Claims
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IPC IPC(8): C07D307/50
CPCC07D307/50
Inventor 李红斌房桂干邓拥军沈葵忠施英乔丁来保韩善明焦健梁芳敏林艳
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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