STUDIES ON THE SOLVENT FOR DEGREASING PROCESS OF RAW WOOL. PART 3

As to the second fundamental analysis with 14 kinds of solvent and greasy wool, the author has examined by the steeping method--static and single operation. The weight of sample greasy wool which was used for one measurement was 5.0g in absolute dry weight. This greasy wool was stuffed uniformly into the cylindrical vessel of stainless steel wire net of a desired capacity. The degree of porosity of sample greasy wool assembly was 90%. The quantity of solvent which was used for one measurement was 100cc, and the temperature was 25±2°C. The steeping time were of four levels of 0.5, 1.0, 5.0 and 9.0 min. The number of repetition of measurement was four times for each combination of various solvents and treating times, therefore the total number of measurement was 224 times. The solvent ratio αs, quantity of solid yolk removed Ys (g), residual suint value sRs (%), residual grease value gRs (%) and residual yolk value yRs (%) for each solvent were measured. Judging from the results obtained, the solvents arranged in order from most suitable to unsuitable for degreasing process of raw wool by the steeping method is perchloroethylene>methylene chloride>kerosene_??_trichloroethylene_??_carbon tetrachloride>mineral turpentine>toluene_??_methyl ethyl ketone_??_chlorothene>propylene dichloride>benzol_??_ethyl ether>anon>acetone.