Method for cleaning and degumming high-lignin raw material

Abstract

The invention discloses a method for cleaning and degumming a high-lignin raw material. The method comprises the following steps: immersing to-be-processed hemp crude fiber in a microwave digestion solution, placing the material in a microwave digestion tank, placing the material in a microwave digestion apparatus, and setting a microwave digestion program to obtain the processed hemp crude fiber;performing high-pressure carbon dioxide processing on the processed hemp crude fiber to obtain intermediate fiber; finally, evacuating liquid in a degumming groove of a bleaching groove, opening a water inlet valve, and obtaining the textile fiber after spraying and flushing. The production cost is relatively low, during a whole production process, water, electricity and gas consumption is relatively low, the time consuming is short, the chemical drugs amount is little, caustic soda is not used during a degumming process, a sodium sulfite component for generating sulfur dioxide exhaust gas isnot used, the environmental protection pressure is small, the waste water processing cost is relatively low, the caustic soda is not used, a chemical reagent has nontoxicity and innocuousness, the consumption is little, and the method accords with the technical requirement of cleaning production.

Description

technical field [0001] The invention relates to the technical field of textile industry, in particular to a method for cleaning and degumming high lignin raw materials. Background technique [0002] Hemp plants are an important source of raw materials for textile fibers. Hemp plant raw materials have gradually become the main source of fiber resources due to their renewability and easy recycling of cellulose. The most important process for preparing hemp fibers is fiber separation technology, namely Degumming technology. [0003] Except for ramie, other hemp plants generally have high content of colloidal components and lignin components. It is precisely because of the high content of lignin components that the difficulty of degumming such raw hemp fibers is exacerbated. [0004] In the prior art, a combined method of chemical degumming and steam flash degumming is commonly used to degumming raw hemp fibers with high gum content. Steam explosion is an effective treatment m...

AI Technical Summary

Problems solved by technology

However, even after steam explosion pretreatment, a large amount of chemical reagents are still required for degumming for a long time, and the degumming effect of some hemp fibers is still unsatisfactory.

[0005] Conventional presoaking + steam explosion + sodium hydroxide treatment, presoaking at room temperature can hardly remove lignin components, and subsequent sodium hydroxide combined with steam explosion treatment, sodium hydroxide will first interact with hemicellulose and pectin in the sample After most of the hemicellulose and pectin are removed, sodium hydroxide will be consumed in large quantities and the concentration will decrease. When it reacts with lignin, the removal effect of sodium hydroxide on lignin is low. This method cannot effectively remove lignin. Although the subsequent high-temperature lye cooking can remove lignin, the conditions are relatively severe (temperature 150-160°C, time 1 hour-2 hours), and cellulose is exposed to high temperature for a long time. Alkaline hydrolysis will inevitably occur, the strength will be partially reduced, and the final fiber quality will be affected