A kind of 1-butyl-3-methylimidazolium chloride salt-licl-dmf system prepares the method for microfiber corn stalk

Abstract

The invention discloses a method for preparing micro-fibre corn stalks by a 1-butyl-3-methimidazole chloride-LiCl-DMF (dimethylformamide) system. The method comprises the following steps: crushing and drying corn stalks; performing high-shear sulphonating treatment at a certain temperature by taking a 1-butyl-3-methimidazole chloride-LiCl-DMF compound system as a solvent and adding a pyridine sulphur trioxide compound; filtering, washing and performing vacuum drying on a material which is subjected to the sulphonating treatment to obtain the micro-fibre corn stalks with high sulphonation degree. According to the method, the corn stalk fibres can be effectively swelled and free hydroxyls can be released by combining 1-butyl-3-methimidazole chloride and LiCl, so that the cohesive force of a raw material is weakened, and the sulphonating modifying efficiency of sulphur trioxide-pyridine complex is improved. By the method, the degradation of hemicellulose and lignin components of the corn stalks can be reduced remarkably; a modifying process is simple and feasible; the modified products of micro-fibres are high in yield and sulphonation degree and large in specific surface area; value-added utilization of agricultural waste is realized; moreover, a modifying liquid is easy to recycle and utilize.

Description

technical field [0001] The invention belongs to the field of plant fiber processing and modification methods, in particular to a high-shear method using corn stalks as raw materials in a 1-butyl-3-methylimidazolium chloride salt-LiCl-DMF (dimethylformamide) solvent system Process for preparing microfibrillated fibers with a high degree of sulfonation. Background technique [0002] Plant fiber is one of the most abundant renewable resources on the earth, containing huge biomass energy. The main components of biomass resources are cellulose, hemicellulose and lignin. Cellulose is the main component of plant cell walls; hemicellulose acts as a molecular adhesive between cellulose and lignin; lignin has a network structure to connect cells, and acts as a supporting framework to surround and reinforce cellulose and hemicellulose. At present, the global energy shortage, atmospheric greenhouse effect and tight oil supply have promoted the research of biomass refining. [0003] P...

AI Technical Summary

Problems solved by technology

Traditional plant fiber modification has poor reactivity due to its dense structure, and it is difficult to effectively separate plant fiber cells. The corresponding modification method needs to undergo multi-step chemical, biological or mechanical treatment, which leads to high cost of modification, heavy pollution, and poor product performance.