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Straw raw material pretreatment method and device for straw water reducing agent

A technology of pretreatment device and water reducer, which is applied in the field of straw raw material pretreatment of straw water reducer precursor, can solve the problems of insufficient utilization of straw raw materials, low water reducing rate of water reducer, waste, etc., and achieve a reactive area Larger, less corrosive, simple reaction process

Active Publication Date: 2021-11-26
TIANSHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water reducing agent prepared by this method has a low water reducing rate and can only be used as the most common water reducing agent
Chinese Patent CN 101759856 B "Preparation Method of Sodium Lignosulfonate Water Reducer", using corn cob, corn cob acid hydrolysis residue, bagasse or corn stalks as raw materials to produce black liquor after alkali boiling, after coarse filtration and ultrafiltration Membrane concentration, sulfonation and spray drying to prepare sodium lignosulfonate superplasticizer with low water content. This process has no pollution to the environment, simple process and low cost, but straw raw materials cannot be fully utilized and the waste is serious
However, there is no report on the micro-crushing and hydrolysis pretreatment method and equipment of straw raw materials for direct preparation of superplasticizers by using crop straws.

Method used

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  • Straw raw material pretreatment method and device for straw water reducing agent
  • Straw raw material pretreatment method and device for straw water reducing agent

Examples

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Effect test

Embodiment 1

[0060] A straw raw material pretreatment method of a straw water-reducing agent according to the present invention, such as figure 1 As shown, the specific steps are as follows:

[0061] S1. Micro-crushing pretreatment of straw raw materials:

[0062]After the raw material straw bales 3 are naturally air-dried, they are crushed into straw sections of 1 to 3 cm through the primary straw crushing module 2, and then fed into the cleaning module 5 through the 1# straw coarse material conveying duct 4, and the primary crushed straw sections are The mud, sand and other impurities in the straw are cleaned, and the cleaned straw section is sent to the pre-drying module 6 through the outlet of the cleaning module 5 for preliminary drying, and then sent to the screw dryer 8 through the coarse material conveyor belt 7 for further drying. The final straw section is blown out from the upper part of the screw dryer 8 and enters the cyclone separator 9 connected to the outlet of the screw d...

Embodiment 2

[0072] According to the present invention, a straw raw material fine crushing-hydrolysis pretreatment method of a straw-based water reducing agent, the specific steps are as follows:

[0073] S1: Micro-crushing pretreatment of straw raw materials, the specific process is completely the same as the process of S1 in Example 1;

[0074] S2: straw powder hydrolysis pretreatment, the process is completely the same as the S2 process of Example 1, the difference is that the added hydrolysis catalytic acid is different, specifically in:

[0075] Described lubricating additive is stearic acid, and the solid agent ratio of straw and stearic acid=1000g: 10ml;

[0076] The main catalytic acid for hydrolysis is a dibasic (carboxylic) acid represented by itaconic acid, and the solid-acid ratio of straw and itaconic acid=1000g: 20ml;

[0077] The hydrolysis-promoting acid is dilute hydrochloric acid with a mass concentration of 30g / L, and the solid-acid ratio of straw to dilute hydrochloric...

Embodiment 3

[0079] According to the present invention, a straw raw material fine crushing-hydrolysis pretreatment method of a straw-based water reducing agent, the specific steps are as follows:

[0080] S1: Micro-crushing pretreatment of straw raw materials, the specific process is completely the same as the process of S1 in Example 1;

[0081] S2: straw powder hydrolysis pretreatment, the process is completely the same as the S2 process of Example 1, the difference is that the added hydrolysis catalytic acid is different, specifically in:

[0082] The lubricating additive is a mixture of stearic acid and oleic acid each accounting for 1 / 2, and the solid-to-solid ratio of the straw to the lubricating additive is 1000g: 10ml.

[0083] Described main catalytic acid of hydrolysis is the polybasic (carboxylic) acid represented by citric acid, and the solid-acid ratio=1000g of straw and citric acid=1000g: 15ml;

[0084] The hydrolysis-promoting acid is a mixed acid whose mass concentration i...

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Abstract

The invention discloses a straw raw material pretreatment method and a device thereof for a straw water reducing agent. In the method of the present invention, the straw raw material is first crushed, cleaned, dried, secondary crushed, and finely crushed; the straw powder obtained through the finely crushed pretreatment is hydrolyzed, and the hydrolysis method is: adding lubricating additives, The hydrolysis main catalytic acid and the hydrolysis promotion acid, wherein the solid-to-liquid ratio of straw: lubricating additive: hydrolysis main catalyst acid: hydrolysis promotion acid is 1000g: 6-10ml: 15ml: 100ml. The method of the invention effectively separates cellulose, hemicellulose and lignin, separates the hemicellulose and lignin wrapped outside the cellulose, reduces the degree of polymerization of plant cell walls, and improves the hydrolysis efficiency of straw lignocellulose ; The device is simple in structure, easy to operate, high in straw fine crushing and hydrolysis efficiency, low in cost, easy to industrialize, creates favorable conditions for the synthesis of straw water reducing agent, and has potential industrial value and application prospect.

Description

technical field [0001] The invention relates to the field of straw raw material pretreatment method and equipment for straw water reducer precursor, in particular to a straw raw material pretreatment method and device for straw water reducer. Background technique [0002] At present, there are few research reports on the direct use of biomass straws for water reducing agents, most of which are to extract and separate cellulose and lignin from straws, or use straws to produce paper and ethanol black liquor wastewater as raw materials for water reduction. Research on the modification of the agent or compound research with the polycarboxylate superplasticizer. [0003] Research on lignin modified water reducer, Chinese patent CN101337789 A "method for preparing water reducer by condensation modification of wheat straw alkali lignin", adding wheat grass alkali lignin to 4.4 to 5.5 times the weight of water to dissolve, adding wheat straw alkali wood Copper sulfate with a weight...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/02
CPCC04B18/24C04B20/023C04B20/026
Inventor 章德玉张惠琴张建斌刘流赵爱英王鹏刘岿司长代唐慧安左国防王小芳刘新文雷新有吕玲玲李志锋郭峰
Owner TIANSHUI NORMAL UNIV
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