Abstract:

In order to develop a green and efficient hemp degumming process, a combining degumming process using ammonium oxalate and enzyme was proposed. The ammonium oxalate degumming process was optimized using the orthogonal test, and the degumming effect of hemp fiber treated by ammonium oxalate-enzyme method was compared with that of hemp fiber treated by the traditional chemical method and that of hemp fiber treated by the chemical-enzyme method. Results show that the optimum conditions of ammonium oxalate-enzyme combining degumming method are the concentration of ammonium oxalate is 4.0 g/L, holding temperature is 100 ℃ and holding time is 50 min; The residual gel rate of hemp fiber treated by the best technology of ammonium oxalate-enzyme combining degumming process is 2.34%, which is lower than that of hemp fiber treated by the traditional chemical combining degummin process (12.88%) and that of hemp fiber treated by the chemical-enzyme combining degumming process (8.43%); After being treated by the optimal process of ammonium oxalate-enzyme combining degumming process, the lignin content of hemp fiber decrease from 8.10% (marijuana) to 0.94%, the breaking strength of hemp fiber is 10.31 cN/dtex, and the whiteness of hemp fiber is superior to that of hemp fiber treated by the traditional chemical degumming process and that of hemp fiber treated by the chemical-enzyme combining degumming process.

Key words: hemp fiber, ammonium oxalate, enzyme, degumming process, residual gel rate