Rice Husk Cellulose Derivatives And Its Application

Cellulose is the most abundant natural polymer material, which is easier obtainable, nontoxic, biodegradable. So the exploitation and utilization of cellulose is always the interested subject. The abundant rice husk as agricultural byproduct contains plentiful cellulose. It is significant to exploit the application of rice husk cellulose. So the following several aspects' studies have been done:,A kind of polythioether cellulose compound (PTEC) with 4.31% sulfur content was synthesized by etherification of rice husk cellulose with chloromethylthiirane in alkaline media. The preparation conditions have been investigated. The product has an adsorption capacity of O.23mmol-g-1 for Ag+ and 0.33mmol-g-1 for Hg2+ at pH=7, respectively.Cellulose was treated by thionyl chloride to give 6-chlorodeoxycellulose (6-CDC), which was treated with anhydrous hydrazine, ethylenediamine, diethylenetriamine, triethylenetetramine, 1,4-diaminobutane and hexamthylenediamine respectively giving six chelating resins(ADC-l~ ADC-6). Cross-linking of ADC with chloromethylthiiane at present of alkaline gave six new chelating resins(TADC-1 ~ TADC-6) which contain sulfur and nitrogen. The conditions of synthesis for CDC, ADC and TADC were studied. The adsorption properties of ADC resins and TADC resins for metal ions were thoroughly studied. It was found that ADC resins possessed high adsorption capacity for Cu2+ Cr3+ Ni2+Zn2+ Hg2+, the adsorption capacity for Kg2+ is about 0.5mmol-g-1, and TADC resins possessed high adsorption capacity for Cu2+ Hg2+ Ag+, the adsorption capacity for Hg2+ and Ag+ are about l.lmmol-g-1 and 1.9mmol-g-1. The adsorption capacity of ADC resins and TADC resins for metal ions are in the order Hg2+ Cu2+ Cr3+ and Ag+ Hg2+ Cu2+ . They can be reused from desorption by 10% ammonia hydroxide.The above studies can be used in enriching, determining and removing of metal ions.Additionally, two new cellulose derivatives were synthesized by reaction of CDC with 2-aminopyridine and 3-aminopyridine, respectively.The dissolving conditions of rice husk cellulose in the lithium chloride /N,N-dimethylacetamide solvent were studied, shortening the dissolvmg,time and reducing the amount of solvent compared with that reported in literature. Three kinds of rice husk cellulose monoester of maleic acid with different degree of substitutes were prepared and the influent factors on the reaction were discussed. The viscosity and API fluid loss in drilling mud of fresh water were studied in laboratory. The study shows that the products have better filtration-II-controlling ability. It is a good kind of filtration controller in oilfield.A new type of biodegradable film was prepared from rice husk cellulose cross-linked with tolylene-2,4-diisocyanate (TDI) in the lithium chloride /N,N-dimethylacetamide solvent.The polyurethane (PU) foam plastic mixed with rice husk was prepared by adding rice husk in the course of foaming of PU. The preparing conditions and biodegradation in the natural conditions were investigated.6-Aminodeoxycellulose with DS of 0.34 was synthesized from rice husk cellulose by esterification by p-toluenesulfonyl chloride substitution by potassium phthalimide, then hydrazinolysis. The potential bioactive material was expected from the study.