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Method for regulating and controlling crystallinity of crystals on cellulose surface

A technology of cellulose and crystallinity, applied in the production of bulk chemicals, etc., can solve difficult problems such as handling, and achieve the effects of low production cost, good thermal stability, and simple production process

Inactive Publication Date: 2015-07-01
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the stable and dense structure of cellulose, it is difficult to treat it. One of the current environmentally friendly methods for treating cellulose is the ionic liquid method. After that, a homogeneous solution will be formed, in which the crystallinity decreases and the cellulose dissolves simultaneously

Method used

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  • Method for regulating and controlling crystallinity of crystals on cellulose surface
  • Method for regulating and controlling crystallinity of crystals on cellulose surface
  • Method for regulating and controlling crystallinity of crystals on cellulose surface

Examples

Experimental program
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Effect test

Embodiment 1～20

[0047] See Table 1 for the raw materials, implementation conditions and product crystallinity used in Examples 1-20. The "product cellulose crystallinity" recorded in Table 1 is the relative crystallinity, and the product cellulose crystallinity recorded=crystallinity of treated microcrystalline cellulose / untreated microcrystalline cellulose*100%. The crystallinity of the raw material is 100%, the crystallinity of the product is higher than 100%, and the lower is less than 100%. The specific operation is as follows:

Embodiment 1

[0048] Example 1: First, 1 g of microcrystalline cellulose was added to a 250 ml flask containing 100 g of [Amim][Cl] aqueous solution, the concentration of the ionic liquid was 60 wt%, heated in an oil bath, and the temperature was controlled at 100°C, and the reaction was carried out for 0.5 h Finally, after cooling the reaction solution, filter the reaction solution directly, wash the filter cake, and dry at 30°C to obtain a product whose crystallinity on the surface of the cellulose is changed, and the crystallinity of the cellulose is 105% compared with that of the raw cellulose.

[0049] Embodiments 2-20 have the same operating method as that of Embodiment 1, and the specific operating conditions are shown in Table 1.

[0050] Table 1

[0051]

[0052]

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Abstract

The invention relates to a method for regulating and controlling crystallinity of crystals on a cellulose surface, which relates to the field of application of biomass resource, in particular to the technical field of application of organic high molecular cellulose. According to the method for regulating and controlling the crystallinity of crystals on the cellulose surface, ionic liquid aqueous solution with concentration of 60-95 percent is used as a solvent; the cellulose and the solvent are mixed according to the mass ratio of the cellulose to the solvent of 1:100-1:8 and react at the temperature of 80-170 DEG C for 0.5-10 hours; the ionic liquid is at least one ionic liquid compound with a general formula of A<+>B<->; A<+> is cation with a general formula I; and B is halogen. The method has the advantages of simple production process, low production cost and no environmental pollution caused by wastewater and waste gas.

Description

technical field [0001] The invention relates to a method for regulating crystallinity of cellulose surface crystals, relates to the application field of biomass resources, in particular to the application technical field of organic polymer cellulose. Background technique [0002] With the increasingly severe oil crisis and environmental pollution, the country has increasingly strict requirements on the production process of chemical raw materials, and more and more attention has been paid to the development and utilization of renewable biomass resources. Cellulose is the main component of crops and forestry residues (accounting for about 40-50% Wt), and is the most abundant renewable biomass resource on earth. my country is a large agricultural country. The national crop straw output is about 600 million tons per year, of which about 300 million tons of cellulose can be collected and used per year. Converting cellulose into important chemical raw materials is a good way to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/02C08L1/02
CPCY02P20/54
Inventor 马英冲李坤兰魏立纲王少君于雅晨谭宇鑫苏通
Owner DALIAN POLYTECHNIC UNIVERSITY