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Method for pre-treating corn stalks by diluted hydrochloric acid auxiliary oxide morpholine-N-oxide

A technology of corn stalks and oxidized morpholine, which is applied in the field of chemical engineering, can solve the problems of low accessibility of cellulose, complex cellulose structure, etc., and achieves the effects of mild pretreatment conditions, less three wastes, and good pretreatment effect.

Active Publication Date: 2015-06-24
江苏溢坤医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cellulose has a complex structure, high crystallinity, a large number of crystalline structures inside cellulose, and intermolecular and intramolecular hydrogen bonds, resulting in low accessibility of solvents and reagents to cellulose, which restricts cellulose resources. the bottleneck of utilization

Method used

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  • Method for pre-treating corn stalks by diluted hydrochloric acid auxiliary oxide morpholine-N-oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 Dilute hydrochloric acid (0.5% w / w) assisted NMMO for pretreatment of corn stover

[0016] In the pretreatment system, 2 g of dried corn stalks are dissolved and pretreated with 85% (w / w) NMMO and 0.5% (w / w) dilute hydrochloric acid at 90 °C for 2 h, and then washed with deionized water regeneration. After washing the regenerated cellulose material with deionized water for three times, add pH=4.8 acetic acid-sodium acetate buffer (50 mM) to form a mixed system. The final mass concentration of corn stover cellulose material is 20%, and then the final mass concentration is 0.3%. The cellulase was subjected to enzymatic hydrolysis, and the reaction was shaken on a constant temperature shaker at 50 °C and 180 rpm for 72 h. The yield of reducing sugar was 65.4%.

Embodiment 2

[0017] Example 2 Dilute hydrochloric acid (10% w / w) assisted NMMO for pretreatment of corn stover

[0018] In the pretreatment system, 2 g of dried corn stalks are dissolved and pretreated with 85% (w / w) NMMO and 10% (w / w) dilute hydrochloric acid at 120 °C for 0.5 h, and then washed with deionized water for regeneration. . After washing the regenerated cellulose material with deionized water for three times, add pH=4.8 acetic acid-sodium acetate buffer (50 mM) to form a mixed system. The final mass concentration of corn stover cellulose material is 20%, and then the final mass concentration is 0.3%. The cellulase is hydrolyzed by enzyme, and the reaction is shaken on a constant temperature shaker at 50 °C and 180 rpm. figure 1 As shown, there is no obvious inhibition in the saccharification process. After 72 hours of reaction, the yield of reducing sugar is 70.8%, and the yield of glucose is 37.0%.

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Abstract

The invention relates to a method for pre-treating corn stalks by diluted hydrochloric acid auxiliary oxide morpholine-N-oxide, which belongs to the field of chemical engineering. The method comprises the following steps of: carrying out dissolving pre-treatment for 0.5 hour-2 hours on corn stalks at 90 DEG C-120 DEG C in an NMMO (Oxide Morpholine)-diluted hydrochloric acid-water pre-treatment system; adding deionized water to wash and regenerate to obtain a cellulose material; washing the regenerated cellulose material by the deionized water by three times, adding an acetic acid-sodium acetate buffer solution to form a mixed system; and carrying out enzymolysis by using cellulose, and carrying out an oscillatory reaction on a constant-temperature shaking table with the speed of 180 rpm at 50 DEG C to achieve the enzymolysis purpose of corn stalks. According to the method for pre-treating corn stalks by diluted hydrochloric acid auxiliary oxide morpholine-N-oxide disclosed by the invention, the diluted hydrochloric acid auxiliary oxide morpholine-N-oxide is utilized to pre-treat the corn stalks, so that the high-value utilization of the corn stalks is realized, and the reducing sugar yield is bigger than 60%. The method for pre-treating corn stalks by diluted hydrochloric acid auxiliary oxide morpholine-N-oxide has the advantages of being simple in process, high in efficiency, economical in process, less in the three wastes, and the like.

Description

technical field [0001] The invention discloses a dilute hydrochloric acid assisted oxidation of morpholine- N The invention discloses a method for pretreating corn stalks with oxide (NMMO), which belongs to the field of chemical engineering. Background technique [0002] With the development of society and economy, more and more energy is consumed. Due to the limitation and non-renewability of fossil fuels, biomass energy has gradually become the focus of attention in recent years. Experts predict that biomass energy will become an important part of sustainable energy in the future. By 2015, 40% of the world's total energy consumption will come from biomass energy. The cellulose resources on the earth are very rich. The total output of crop straw in my country exceeds 700 million tons. The effective use of cellulose resources by corn straw has practical significance for the energy crisis faced by human beings. [0003] The main components of woody biomass resources are cel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P19/14
Inventor 何玉财李创吴培培张跃龚磊陶志成庞震苗俊杰马翠鸾
Owner 江苏溢坤医疗科技有限公司
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