Experimental Research And Simulated Calculation On Process For Fluidized Bed Methanol To Gasoline

Methanol to gasoline(MTG)reaction is a typical reaction with high reaction rate,large and concentrated reaction heat,and easy deactivation of catalyst.Now the fixed bed process requires nine times more gas than reactant to remove the heat.Such process requires high energy combustion and has short operation time.Conversely,fluidized bed process represents an advanced development direction with the advantages of good heat transfer,mass transfer,temperature stable distribution,good effect of heat exchange,high-quality oil and so on.At present,the yield of gasoline by fluidized bed is as low as18% to 25%,and industrialize technology has not achieved yet.In addition,there are some problems that the selectivity of catalyst and the yield of gasoline are low,and operating conditions are harsh in industrial equipment.To solve these problems,this research studied the law of the reaction of methanol to gasoline based on small fluidized bed experimental and then simulates the fluidized bed process referred to the literature in order to find a more suitable fluidized bed process.The main contents are as follows:1)Modified ZSM-5 molecular sieve with 100-200 mesh were prepared by spray-drying method for the usage in fluidized reactor.The catalytic performance of this modified ZSM-5 molecular sieve for Methanol to Gasoline was evaluated in bench-scale fluidized bed reactor with an inner diameter of 32 mm.The result showed that the performance of catalytic b was higher than a.And it can improve the gasoline yield with the addition of Phosphorus and Lanthanide elements to the catalyst.2)The catalytic activities for MTG were evaluated on bench-scale fluidized bed reactor to investigate the conversion of the methanol,gasoline yield,selectivity of olefins and aromatics under different temperature,pressure and space velocity.The result showed that the improvement of pressure was helpful to increase the gasoline yield.With the addition of Lanthanide elements to the catalyst and under the reaction condition at temperature of 380 ?,pressure of 0.5 MPa,and WHSV of 4.6 h-1,the methanol conversion and gasoline yield were reach 100% and 30% respectively.3)This paper simulated the process of fluidized bed referred to the literature on basis of experimental data.The calculation result showed that the optimal process was with the ratio of the recycle gas and reaction gas as 1:1 feeding and the reaction product were separated after the completion of the reaction,gas phase and liquids phase reach to theappropriate pressure respectively through compressor and pump to conduct the separation operation.