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Cotton straw fulvic acid and cellulose ethyl alcohol production process

A technology of cellulosic ethanol and cotton stalks, which is applied in the field of comprehensive utilization of straw biomass resources, can solve the problems of greatly affecting accessibility and increasing the amount of cellulase preparations, so as to improve economic competitiveness, eliminate negative effects, and realize Effects of Circular Economy and Sustainable Development

Active Publication Date: 2020-02-28
白博
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some studies have shown (see the paper "Factors Affecting Cellulose Enzyme Hydrolysis and Research on Cellulase Adsorption Performance" ("Chemical Reaction Engineering and Technology" Volume 16, Issue 1, March 2000), Institute of Chemical Metallurgy, Chinese Academy of Sciences State Key Laboratory of Biochemical Engineering, Chen Hongzhang, Li Zuohu research conclusions): the first is that the accessibility of cellulose to cellulase is greatly affected by the structural properties of hemicellulose and lignin in lignocellulose; the second is that the hemicellulose Cellulose and lignin have the same adsorption to cellulase, making it ineffective to increase the amount of cellulase preparation
The third is the hemicellulose hydrolyzate in cellulose pretreatment, including the inhibitory effect on the subsequent cellulose saccharification, hydrolysis, fermentation and distillation, so there are many technical solutions in cellulose pretreatment to take measures to hydrolyze hemicellulose removal, but none of them involve the simultaneous production of hemicellulose hydrolysis and fulvic acid

Method used

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  • Cotton straw fulvic acid and cellulose ethyl alcohol production process
  • Cotton straw fulvic acid and cellulose ethyl alcohol production process
  • Cotton straw fulvic acid and cellulose ethyl alcohol production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] First, high-purity cellulose and fulvic acid are obtained through pretreatment.

[0145] Cotton straw is pulped by acidic ammonium sulfite for fiber pretreatment, and the sequence is "material preparation - washing - cooking (complete hemicellulose hydrolysis and fulvic acid extraction) - spraying - squeezing - refining - extraction of fulvic acid Acid black liquor-screening-fiber classification-high-purity cellulose" process is completed, specifically:

[0146] (1) Prepare materials, take cotton straw from the tenth regiment of the first division of the Xinjiang Construction Corps, with a cellulose content of 42.35%, a lignin content of 24.52%, and a hemicellulose content of 18.31%, collect and pulverize the cotton straw to 10-20 cm, and transport it to the raw material warehouse Air-dried and stacked storage, keep the water content below 20%; according to the design feeding speed of 2 to 2.5 tons of soil-removed, impurity-removed and dry raw materials to produce one t...

Embodiment 2

[0168] (1) pretreatment flow process is the same as embodiment 1

[0169] (2) Cooking, hemicellulose hydrolysis and fulvic acid extraction process are as follows: the amount of ammonium sulfite is 15% of the net weight of the raw material, the amount of acetic acid is 5% of the net weight of the raw material, the liquid ratio is 1:6, the pressure is 0.6-0.8Mpa, the temperature 160°C, holding time 150min, start cooking at pH 6.1, and finish cooking at pH 4.5.

[0170] (3) Obtain pretreated cellulose and fulvic acid. The xylan content in the cellulose is 2.9%, and the fulvic acid concentrated black liquor is sprayed and dried to obtain a fulvic acid dry powder, and the fulvic acid content is 41% (dry basis).

Embodiment 3

[0172] (1) The pretreatment process is the same as in Example 1.

[0173] (2) Cooking, hemicellulose hydrolysis and fulvic acid extraction process are as follows: the amount of ammonium sulfite is 15% of the net weight of raw materials, the amount of maleic acid is 0.4mol / L, the liquid ratio is 1:6, the temperature is 160°C, and the pressure is 0.6 ~0.8Mpa, holding time 150min, start cooking pH6.1, finish cooking pH5.2.

[0174] (3) obtain pretreated cellulose and fulvic acid, xylan content 1.9% in the cellulose, the thick black liquor of fulvic acid obtains fulvic acid dry powder by powder spraying drying, fulvic acid content 44% (dry basis ).

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Abstract

The invention relates to a cotton straw fulvic acid and cellulose ethyl alcohol production process. Cotton straws serve as raw materials to produce fulvic acid and cellulose ethyl alcohol, and hemicellulose is hydrolyzed when the fulvic acid is extracted in the same process, fulvic acid extraction and hemicellulose hydrolysis are synchronously implemented in a pretreated manner, comprehensive by-products are pretreated, and high-purity cellulose is separated, so that cellulose pretreated black liquor and diastatic fermentation distillation waste mash sewage are treated and recycled by different systems. According to the process, production costs of cellulose ethyl alcohol are reduced from various links of a whole system, fulvic acid is produced by lignin, harmful materials are turned intowealth, fiber raw material resources are comprehensively utilized, and comprehensive economic benefits of cellulose ethyl alcohol production are improved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of straw biomass resources, in particular to a cotton straw fulvic acid and cellulose ethanol production process. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] According to the estimates of the American Petroleum Institute, the unexploited crude oil reserves on the earth are less than 200 million barrels, which can be exploited by human beings for no more than 95 years. In 2018, China's dependence on foreign crude oil was 70.9%. Human beings are facing the threat and challenge of the depletion of oil resources and urgently need development. Alternative energy, and inexhaustible straw ...

Claims

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Application Information

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IPC IPC(8): C12P7/10C07G1/00
CPCC07G1/00C12P7/10C12P2201/00Y02E50/10
Inventor 白博白嘉妮
Owner 白博
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