Study on Analytical Method for Rapid Determination of Hot Water-Soluble Substances in Plant Fiber Raw Materials by Countercurrent Brewing Method
The content of hot water soluble matter can indirectly reflect the performance of plant fiber raw materials for pulp and paper making,and a quick and accurate judgment of its content is necessary for traditional pulp and paper making,cellulose fiber purification and other related industries.However,the hot water static extraction method adopted in the current national standard requires 4 h of extraction time and at least 5 h of drying and equilibrium time,and such a time-consuming detection process is unfavorable for the rapid judgment of the content of hot water soluble matter.In view of this,this paper adopts multiple countercurrent brewing method for rapid extraction of plant fiber raw materials,and the subsequent high-temperature drying process was studied.The optimized conditions for rapid and relatively accurate determination of soluble matter content in hot water are as follows:the mass of plant fiber raw material to be tested is 1.50±0.2 g,the particle size is 60～80 mesh,the liquid volume of a single brewing is 100 mL,the number of times of brewing is 4 times(the total time consumed for the brewing is about 15 min),and the drying temperature is 120℃for 3 h.The results of the verification of the accuracy of the method show that the reproducibility and generalizability are good,and it can be used to extract the soluble matter content in hot water quickly.The results show that this method has good repeatability and universality,and it can be used as an alternative method to analyze the content of hot water soluble matter in plant fiber raw materials relatively quickly and accurately in relevant factories or research institutes,and it has a certain value of popularization and application.
papermaking fiber raw materialshot water soluble mattercountercurrent brewing methodmocha potrapid analysis method
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