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Method for preparing oligosaccharide and paper pulp

A technology of xylooligosaccharides and pulp, which is applied in the direction of pulping with inorganic alkali, pretreatment with alkaline compounds, fermentation, etc., can solve the problems of pulp and black liquor performance of unlisted xylose preparation methods, and achieve fiber quality And the effect of improving the physical performance index

Active Publication Date: 2013-06-26
CHINA NAT PULP & PAPER RES INST CO LTD
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Problems solved by technology

However, these methods do not list the specific preparation method of xylose and the properties of pulp and black liquor

Method used

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  • Method for preparing oligosaccharide and paper pulp

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Effect test

Embodiment 1

[0023] Embodiment 1: take wheat straw as raw material to prepare xylo-oligosaccharide and paper pulp

[0024] step:

[0025] 1) Cut the wheat straw to 3-5cm, add 1.2kg of dry material to the reaction kettle, then add sodium hydroxide accounting for 5% of the dry material, and add water to make the ratio of the total liquid to the dry material 5:1, rotate the reactor to mix the materials evenly. Start timing at 50°C, raise the temperature to 130°C within 1 hour, and keep warm at this temperature for 0.5 hours before the pretreatment is completed. Separate the pre-extract and solid residue.

[0026] 2) The obtained pre-extraction is concentrated to about 10% of the total solids concentration with a polyethersulfone ultrafiltration membrane with a molecular weight cut-off of 10,000, and then evaporated to about 40% of the total solids concentration using a vacuum evaporator; Adjust the pH value to 6 with acetic acid, add the same volume of 95% ethanol, through precipitation an...

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Abstract

The invention discloses a method for preparing oligosaccharide and paper pulp, belonging to the technical fields of pulping and the comprehensive utilization of pulping. The method comprises the steps of: using crop straws as raw materials, pre-treating the raw materials to obtain a pre-extracting solution, concentrating the pre-extracting solution by a membrane separation method, then obtaining a crude xylan solution via precipitation and centrifugal separation, and then preparing oligosaccharide via enzymolysis, vacuum concentration and frozen-drying. The pre-treated solid residues are stewed via an alkaline process so as to prepare unbleached paper pulps of which the indexes such as fiber length, whiteness, fracture length, tear resistance, folding strength and the like are all improved. The generated black liquid has the characters of low viscosity and high heat productivity. The method for preparing oligosaccharide and paper pulp integrates the comprehensive utilization method with the biomass transformation method on the premise of optimizing the traditional alkaline chemical pulping technique to prepare products with high additional values, namely oligosaccharide, thereby increasing the quality of the paper pulp and the extraction, vaporization and combustion performances of the black liquid.

Description

technical field [0001] The invention relates to a method for preparing xylooligosaccharide and pulp by using crop straws, and belongs to the technical field of pulping and pulping comprehensive utilization. Background technique [0002] With the increasing severity of energy shortage, environmental pollution and climate change, the introduction of biomass conversion in the paper industry has become an ideal choice, which will make the pulp and paper industry comprehensive utilization of fiber raw materials, product value and environmental protection, etc. raised to a new level. [0003] The pulp and paper industry is the first industry to utilize renewable fiber resources on a large scale, and has the infrastructure and practical experience in large-scale collection, treatment, and processing of biomass resources. my country has abundant non-wood fiber resources, and crop straw is one of the most commonly used non-wood fiber raw materials in the paper industry. As agricult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02D21C1/06C12P19/14
Inventor 徐明曹春昱冯文英苏振华张升友
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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