In this paper, a novel hydrophobic modified cationic polyacrylamide flocculant P(AM⁃DAC⁃APG) was successfully synthesized by copolymerization of acrylamide (AM) as the main monomer, acryloxyethyl trimethyl ammonium chloride (DAC) as the cationic monomer and alkyl glycoside (APG) as the hydrophobic monomer, initiated by low⁃pressure ultraviolet light. FTIR, SEM and 1H⁃NMR were used to observe and analyze its chemical structure and surface morphology. The effects of other factors such as total monomer concentration and initiator concentration on the polymerization were studied. Optimum polymerization conditions were confirmed as total monomer concentration of 35.0%, initiator concentration of 0.2%, illumination time of 90 min, m（AM）/m（DAC）of 3, hydrophobic monomer concentration of 2.0%, urea concentration of 3.0%. The novel hydrophobic modified polyacrylamide flocculant with intrinsic viscosity and cationic charge density of 1 384.8 mL/g and 5.091 mmol/g was obtained under these conditions.

The esterification of oleic acid with methanol catalyzed by Yβ composite zeolite supported phosphotungstic acid( H3PWl 2O4 0/ Y - β) was reported. The effect of catalyst amount， the ratio of methanol to oleic acid, reaction time, catalyst recycling times on the yield of methyl oleate were carefully studied. The result show that the catalyst had many advantages such as high catalytic activity, easy to recycle and good reusability. The yield of methyl oleate reached 94.7% under the following optimum reaction conditions: 0.1 mol oleic acid, the ratio of methanol to oleic acid 1.8，1.2 g catalyst, reaction time 90 min.