Study on degumming technology of flax fiber by supercritical CO2 assisted compound enzyme
In order to achieve efficient extraction of flax fiber,supercritical CO2 technology and biological enzyme impregnation technology were combined to degum the waste flax straw.The extraction process of supercritical CO2 treatment thme,treatment temperature and treatment pressure was optimized by response surface design.The relationship between supercritical CO2 assisted enzymatic degumming process parameters and degumming effect was studied by orthogonal test with fiber residual gum rate,mass loss rate,breaking strength,diameter and fineness as detection indexes,and compared with traditional chemical degumming,compound enzyme degumming and simple supercritical CO2 degumming process.The results show that the optimum process of supercritical CO2-assisted enzymatic degumming was as follows:the treatment pressure was 18 MPa,the treatment temperature was 64℃,the CO2 flow rate was 20 g/min,and the amount of composite enzyme was 8%(xylanase:β-mannanase:pectinase mass ratio was 4.4∶2.3∶1.3).The flax fiber was degummed for 40 min.Compared with other processes,it was found that the residual gum rate of flax fiber treated by supercritical CO2 system was small(14.45%),the damage to cellulose was small,and the fiber strength(47.56 cN)was retained to a large extent,which basically met the spinning requirements.
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