The Study On The Manufacture, The Features And The Characteristics Of The Bean Dregs Microcrystalline Cellulose

MCC is white power materials obtained when the cellulose is at the balanced degree of polymerization through hydrolysis, having excellent reaction function. It is widely applied into various industries, including chemistry, medicine, food, etc. The bean dregs are the secondary product in the process to manufacture bean products that lots of bean dregs are wasted each year, which not only causes environmental pollution but also wastes the resource. Bean dreg MCC hydrolysis condition has been manufactured in response surface optimized acid and RUT after pretreatment of bean dregs with bean dregs as raw material. Also Pb the absorption function for the solution is researched to build dynamics model.The response surface is to optimize normal hexane de-fat condition with bean dregs as raw materials to confirm the solid-liquid ratio of1:23,58℃of reaction temperature and62mins of reaction time as the optimized combination of de-fat conditions. The de-fat rate is93.8%. The protein in the raw materials is removed in pepsin hydrolysis method. The study research is indicated:the removal rate of bean dregs protein is85%when the enzyme addition is0.3g, pH value is2.0and the temperature is40℃The bean dreg MCC is extracted in acid method, factors to impact MCC are researched and acidolysis time, temperature and hydrochloric quality score are optimized in response surface method. The study result is indicated:the mutual effect among three factors has obvious influence on MCC yield and the best technological condition is obtained from regression equation: acidolysis temperature88℃, acidolysis time61mins, hydrochloric acid quality score6.3%and MCC yield69.4%.The best combination for three conditions of the initial pH of the solution, hydrolysis temperature(℃) and hydrolysis time (min) by analyzing and solving the regression equation with cellulose RUT to manufacture bean dreg MCC and optimize the reaction condition in response surface:enzyme addition is0.3%, the initial pH of the solution is4.7and the hydrolysis temperature is47.8℃. Under this condition, the bean dreg MCC yield is79.2%and12.37%is increased to manufacture MCC in the yield acid method. Meanwhile, the two factors are basically similar after comparing appearance, particle size, swelling, degree of polymerization and other physical and chemical nature of MCC manufactured in two methods.The influence of temperature, pH on Pb2+absorption function is researched with bean dregs MCC manufactured in RUT as absorbent to build isothermal adsorption curve. The maximum absorbance of Pb2+on MCC at the temperatures of20℃,40℃and60℃respectively are65.86,66.56and67.74mg/g respectively. It is easy to judge the bean dreg MCC’s absorption on Pb2+by dissociation constant with Langmuir model as linear equation. Moreover, the higher the initial mass concentration of Pb2+is, the better the effect is.