The center angle of 90° as a simulation model of the elbow，under the pressure of 0.15 MPa, the gas mass flow rate of 0.912 6 g/s condition, it selects four different liquid flow:0.27, 0.40, 0.53, 0.80 kg/s, and each condition is simulated using the FLUENT software. By numerical simulation results, it analyzes the fluid flow characteristics at the elbow at each of the conditions, and get the basic law and characteristics of elbow slug flow under different liquid flow.

 

The modification solid catalyst HMS by phosphotungstic acid was prepared by insitu synthesis from DDA, TEOS, and phosphotungstic acid, and applied in pMethoxy acetophenone production with the FriedelCrafts acylation reaction of phenyl methyl ether and Acetic anhydride.The factors including reaction temperature, reaction time, catalyst amount, reactants molar ratio phenyl methyl ether to Acetic anhydride on the FriedelCrafts acylation reaction were investigated. The experimental effects show that solid acid catalyst HMS has high catalytic activity.The acylation reaction conversion can reach 83.1% and the selectivity of pMethoxy acetophenone production is 97.3% under the following optimal conditions: reaction temperature of 100 ℃, reaction time of 4 h, amount catalyst of 0.15 g, molar ratio of n( anisole)∶n(acetic anhydride) =1∶1.5.