New process for preparing microcrystalline cellulose from lignocelluloses biomass

Abstract

The invention discloses a new method for preparing microcrystalline cellulose from lignocelluloses biomass and particularly relates to a new method for utilizing lignocelluloses biomass and preparing the microcrystalline cellulose, belonging to the field of biomass material process transfer and application. The prepared microcrystalline cellulose has the cellulose content being more than or equal to 97.3 percent, the crystallinity being more than or equal to 80 percent, the ignition residue being less than or equal to 0.2 percent and the pH being 5.0-7.5 and can be widely applied to the fields of medicines, foods, chemical engineering, daily chemicals and the like as a novel cellulose function material.

Description

technical field [0001] The invention belongs to the field of process conversion and application of biomass materials, and in particular relates to a new process for the utilization of lignocellulosic biomass and the preparation of microcrystalline cellulose. Background technique [0002] Microcrystalline cellulose (Microcrystalline Cellulose) is a product with a limited degree of polymerization obtained from natural plant cellulose through dilute acid hydrolysis and various post-treatments. It is an ultra-fine short rod, powder or porous shape with strong flow Granules, insoluble in water, dilute acids and general organic solvents, partially dissolved and swelled in dilute alkali solutions, have high reactivity in the process of carboxymethylation, acetylation and esterification, due to microcrystalline cellulose These special properties make it widely used in the fields of medicine, food, chemical industry, daily chemicals, etc., and become a new kind of cellulose functiona...

AI Technical Summary

Problems solved by technology

However, due to the complex cross-linking structure between cellulose, hemicellulose and lignin in rice straw, the application of rice straw in microcrystalline cellulose, a pharmaceutical excipient, must be effectively pretreated. Only by breaking the cross-linked structure between the three can we prepare high-performance MCC

For example, a large number of pretreatment methods have emerged in the past ten years, such as biological treatment, chemical treatment and physical-chemical combination treatment. These methods have their own advantages and disadvantages. For example, enzymatic hydrolysis is a low-pollution, The process is relatively simple, but the enzyme molecules are difficult to easily enter the interior of the rice straw, and the enzymatic hydrolysis efficiency is very low; the chemical method is basically based on acid and alkali treatment, such as Bao Xin of Jiangnan University, etc. (Chinese patent 101503865A publication date 2009.08.12 ) using "nitric acid-enzymatic degumming-dilute alkali-hydrochloric acid secondary acid hydrolysis method" to process crop straw to prepare MCC. The structure of cellulose causes waste of cellulose, and the yield is only about 20%; Microcrystalline cellulose is prepared from the reaction medium. The preparation process of this invention is simple, and the amount of wastewater produced is less, but extreme conditions such as high temperature and high pressure are required, which increases the requirements for equipment and increases the production cost.

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