Development And Application Of Micro Fluidized Bed Reaction Analyzer For Liquid Reactants

The study of gas-liquid reaction mechanism and the calculation of reaction dynamics parameters calculation is the basis for the materials, environmental, chemical, chemical research and development field. A high viscosity liquid material rapid sampling system was developed. Then connected it with Micro fluidized bed gas-solid reaction apparatus, formed Micro fluidized bed reaction analyzer suitable for liquid material (MFBRA-L:Micro Fluidized Bed Reaction Analyzer for Liquid Reactants). The MFBRA-L can make up for the shortage in the existing liquid material isothermal differential reaction analysis method, and has a wide application prospect.This paper described the design principle, research status and key technology of MFBRA-L. Then showed the application characteristics of MFBRA-L in liquid material pyrolysis, combustion, catalytic cracking of three typical gas-liquid reaction.MFBRA-L includs gas supply system, liquid raw material sampling system, fluidized bed reactor system and data acquisition and analysis system of four parts. By the liquid raw material sampling system, the raw material can be fed into the fluidized bed. Then the gas product get into mass spectrometer, realizes online monitoring data acquisition and analysis.The pyrolysis kinetics characteristics of benzene Tar model compounds of benzene, toluene and xylene in argon atmosphere using MFBRA-L. The results show that, Benzene, toluene and xylene pyrolysis reaction of H2 or CH4 of the apparent activation energy were decreased in turn. For three different kinds of reactants, generate H2 apparent activation energy were higher than CH4 generation of apparent activation energy.Study on the combustion kinetics characteristics of toluene in different N2/O2 ratio under atmosphere. The results show that, the change of oxygen concentration has a great influence on the pyrolysis rate of toluene and the reaction kinetics parameters. The higher the concentration of oxygen, the apparent activation energy of generating H2, CH4 and CO2 is lower. Under the same concentration of oxygen, the apparent activation energy H2, CH4 and CO2 generated by toluene combustion was decreased in turn. It shows that increased oxygen concentration can promote the reaction.The phenol cracking reaction and catalytic cracking reaction were carried out in MFBRA-L. The results show that, dolomite and calcium oxide can significantly affect the cracking reaction of phenol. The effect of catalyst on product H2 was the most obvious, the influence on CO and CH4 is minimal. At 700 degrees, compared with the use of a catalyst, the use of dolomite and calcium oxide can make the yields of H2 increases by about 80 times and 20 times, the total gas yield increased by about 4.9 times and 1.6 times. The results show that the averages of apparent activation energies are 73.94 kJ/mol and 83.77 kJ/mol when phenol is pyrolyzed and generate H2 and CO. The averages of apparent activation energies are 38.66 kJ/mol and 47.37 kJ/mol when phenol is catalyticed by dolomite and generate H2 and CO. The averages of apparent activation energies are 44.26 kJ/mol and 52.77 kJ/mol when phenol is catalyticed by calcium oxide and generate H2 and CO. The use of dolomite and calcium oxide can significantly decrease the activation energy of pyrolysis reaction of phenol.