Optimizationthecelluloseproductionprocessfromflaxfibrewiththeformaliza- tionoftheoptimalitycriteria
During thelong flaxfibres production,the shortfibres, which have limited using, are formed. The short fibre is valuable raw materials for the cellulose production. The problem ofvegetable rawmaterials rational using isrelevant. The aim of the research is solution the multi-criteria optimization problem of the flax celluloses soda boiling with the previous aqueous hydrolysis process by formal- izing the linguistically defined optimality criteria. The soda boiling of flax cellulose from short flax fibre with preliminary aqueous hydrolysis is carried out in the research. The alkali consumption for boil- ing is 20% of the mass of dry raw materials with anthraquinonoid catalyst. Quality indicators of cel- lulose are established. The formalization of the optimality criteria using the methods of the fuzzy set theory is carried out. General view and type of membership functions are chosen, the universe and the values of numerical parameters are determined. The Bellman-Zade optimality principle is used to find the optimal solution. The optimum values of technological parameters for obtaining linseed cellu- lose are established, namely: the duration of aqueous pre-hydrolysis is 2 hours 12 minutes, the temperature of preliminary hydrolysis is 154 OC, the duration of sodium hydroxide is 3 hours, the boiling temperature is 166 OC with the hydro-module is 6:1. The obtained results are in good agreement with solutions obtained by other methods. Linseed cellulose can be used after bleaching for the cellulose nitrates or carboxymethyl-cellulose pro- duction.