Design And Application Study Of Combined Pulsed Electric Field And Ozone Device For Chitosan Degradation

Chitosan degradation has a broad application prospect, it had been studied by more andmore researchers all over the world. These studies were mainly focus on the differentdegradation methods.This issue briefly introduced the current research status at home and abroad of chitosandegradation. Based on these, this issue proposed a new method of chitosan degradation—PEFtreatment synergize with ozone. The corresponding experiment device had been designed, andit was used in the chitosan degradation study, the process of oligochitosan preparation and itsinfluencing factors were discussed. The main research contents and the results were asfollows.1. Experimental devices of ozone degradation and combined method of pulsed electricfield and ozone were designed. The problems of gas dispersion and bubble removing weresolved successfully. Continuous operation of chitosan degradation was achieved, and thedegradation process parameters were optimized.2. The reaction parameters were analyzed. The equivalent heat conduction mode ofsubstrate cooled in water bath was concluded through the temperature change of substrate inprocess chamber. Low temperature and acid environment could enhance the stability of ozonein solution by measuring the solubility of ozone. By analyzing the ozone system including theoriginal ozone, ozone generating system, system control and tail gas treatment system, liquidoxygen was choosed as the origin to synthesize ozone, the optimistic pressure of ozonegenerator was between0.12MPa and0.13MPa, the quantity of demand and supply should beagreed, the tail gas was treated by using MnO2, the mainly index of gas distributor was alsochoosed.3. The co-treatment of PEF and ozone on the degradation of chitosan was analyzed andcompared with the single degradation method. The results reveal that the co-treatment of PEFand ozone on the degradation of chitosan was feasible through this device. With the sametreatment condition, the degradation rate of chitosan through co-treatment, ozone treatmentand PEF teatment were99.5%,94.8%,25%. With the co-treatment of PEF and ozone, thewater-soluble product appeared in ten minutes and disappeared in forty minutes. Comparedwith the single treatment method, the yield of co-treatment was higher than that of singletreatment method with the same treatment time.