Method for preparing biomechanical unbleached pulp from wheat straw

A mechanical pulp and straw technology, applied in pulp beating/refining methods, pulping with inorganic alkali, non-woody plant/crop pulp, etc., can solve the problem of biomass resource consumption, energy waste, and hemicellulose combustion heat Low value and other issues, to achieve the effect of increasing income and reducing resin barriers

Active Publication Date: 2019-04-05
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the calorific value of combustion of hemicellulose in black liquor is very low, directly burning it not only wastes energy, but also consumes good biomass resources

Method used

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  • Method for preparing biomechanical unbleached pulp from wheat straw
  • Method for preparing biomechanical unbleached pulp from wheat straw
  • Method for preparing biomechanical unbleached pulp from wheat straw

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Example 1 A method for preparing biomechanical primary color paste from wheat straw

[0047]Described method comprises the following steps:

[0048] (1) Cut the wheat straw after physical selection and dedusting into small pieces of 2 cm, put it into the reaction kettle of the normal temperature processor, and carry out hot water treatment on the wheat straw according to the liquid ratio of 1:4, the temperature is 100 ℃, and the treatment time is 30 minutes .

[0049] (2) Add 2.5% NaOH to the mixture of hot water and wheat straw in the reactor or processor, adjust the pH value of the hot water to 14, process for 30 minutes, and the temperature is 100°C to dissolve a small part of the hemifiber in the wheat straw Substances such as element, lignin and pectin, while the wheat straw straw is saturated and softened by water heat, the pH value of the water content of the wheat straw straw reaches 8 at the end of the treatment.

[0050] (3) Treat the wheat straw softened by...

Embodiment example 2

[0059] Implementation case 2 A method for preparing biomechanical primary color paste from wheat straw

[0060] Described method comprises the following steps:

[0061] (1) Cut the wheat straw straw after physical selection and dedusting into 3cm small pieces of raw material, put it into a processor or a reaction kettle, and carry out hot water and steam mixing treatment on the wheat straw straw according to the liquid ratio of 1:5, and the temperature is 110°C. The time is 40 minutes.

[0062] (2) Add 2% NaOH to the hot water and wheat straw mixture in the reactor or processor, adjust the pH value of the hot water at 13, the temperature is 95°C, and the treatment time is 30 minutes; a small part of the hemifiber is dissolved in the wheat straw Substances such as element, lignin and pectin, while the wheat straw straw is saturated and softened by water heat, the pH value of the water content of the wheat straw straw reaches 8 at the end of the treatment.

[0063] (3) Treat t...

Embodiment example 3

[0072] Implementation case 3 A method for preparing biomechanical primary color paste from wheat straw

[0073] (1) Cut the wheat straw after physical selection and dedusting into small pieces of 2cm, put it into a processor or a reaction kettle, and treat the wheat straw with hot water according to the liquid ratio of 1:4, the temperature is 95°C, and the treatment time is 60min .

[0074] (2) Add 1.5% KOH to the mixture of hot water and wheat straw in the reactor or processor, adjust the pH value of the hot water to 13, process for 30 minutes, and the temperature is 100°C to dissolve a small part of the hemifiber in the wheat straw Substances such as element, lignin and pectin, while the wheat straw straw is saturated and softened by water heat, the pH value of the water content of the wheat straw straw reaches 8 at the end of the treatment.

[0075] (3) Treat the wheat straw softened by hydrothermal saturation and alkaline biological enzymes in a bioprocessor or bioreactor...

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Abstract

The invention belongs to the field of papermaking technologies and novel materials, and particularly relates to a method for preparing biomechanical unbleached pulp from wheat straw. The method includes pretreating grass by hot water and hot steam; adding trace alkali into the grass and carrying out hot water saturation softening treatment on the grass; adding alkaline biological enzymes into thegrass and carrying out enzyme treatment, pulping and washing. The grass is used as a raw material for the biomechanical unbleached pulp. The method has the advantages that alkali recycling can be omitted in integral production procedures, and environmental pollution can be prevented from the source; the method conforms to the national industry policy of resource conservation, economic cycle, energy conservation and emission reduction; the problems of difficulty in recycling straw pulp alkali wastewater and severe pollution in the prior art can be solved by the aid of the method; the method hasimportant significance in industrial production of straw pulp and the development of the papermaking industry.

Description

technical field [0001] The invention belongs to the field of papermaking technology and new materials, in particular to a method for preparing biomechanical primary color paste from wheat straw. Background technique [0002] In 2016, my country's pulp imports reached 21.06 million tons, and waste paper imports reached 28.5 million tons. The import dependence of paper fiber raw materials was close to 50%. The large amount of waste paper made up for the gap in my country's fiber raw materials and supported the development of the paper industry. In April 2017, the central government issued the "Implementation Plan on Prohibiting the Entry of Foreign Garbage and Promoting the Reform of the Solid Waste Import Management System", which clearly stipulates that my country will ban the import of unsorted waste paper from the end of this year. The total amount of waste paper imports in 2018 was 33% of that in 2017. By 2020, my country will ban the import of waste paper. Our country i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/12D21C5/00D21D1/20
CPCD21C5/005D21D1/20D21H11/12D21C1/06D21C3/02D21C5/00D21C1/02D21B1/061D21C9/02
Inventor 吉兴香王瑞明田中建陈嘉川杨桂花郭玉倩
Owner QILU UNIV OF TECH
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