แนวทางใหม่ในการลดความหนืดของน้ำมันพืชบางชนิดและน้ำมันหมูโดยใช้น้ำและคาร์บอนเตตราคลอไรด์เป็นตัวทำละลายขณะฉายรังสีแกมมาจากโคบอลต์-60 / ชนิศ พรนำพา = A novel approach to reduce viscosity of certain vegetable oil and lard using water and carbon tetracholride as solvents during gamma-ray irradiation from cobalt-60
This research work studied a novel approach to reduce viscosity of certain vegetable oil and lard using water and carbon tetrachloride as solvents during gamma irradiation from cobalt-60. Five parameters were studied. The first was oil types, which were palm oil, processed coconut oil and lard. The second was solvents, which were water and carbon tetrachloride. The third was ratios between oil and solvent as 1:3, 1:1 and 3:1. The forth was gamma ray doses from cobalt-60 of 0.1, 0.5 and 1 kGy. The fifth was addition of metal powders with high atomic numbers, which were nickel (Ni), zinc (Zn) and tungsten (W). Viscosity analysis was done according to ASTM D445 standard. Results indicated that for gamma irradiation from cobalt-60 with all the factors controlled, the first 4 factors resulted in permanent viscosity reduction. The ratio and the most suitable dose for each oil type were: for palm oil, CCl4: Oil at 1:1 and 0.1 kGy dose yielded the viscosity reduction of 25.27% or a viscosity of 30.16 cSt; for coconut oil, CCl4: Oil at 1:1 and 0.5 kGy dose yielded the viscosity reduction of 50.95% or a viscosity of 14.73 cSt; for lard, CCl4: Oil at 3:1 and 0.1 kGy dose yielded the viscosity reduction of 14.59% or a viscosity of 33.13 cSt. It was found that, for the fifth factor, addition of all three types of metal powders with water as solvent during irradiation had no effect on viscosity reduction.