Olefin catalytic agent prepared by naphtha catalytic cracking and preparation method and application thereof

Abstract

The invention discloses an olefin catalytic agent prepared by naphtha catalytic cracking, a preparation method of the olefin catalytic agent and application of the olefin catalytic agent. According to the weight content of a final catalytic agent, the olefin catalytic agent comprises 60%-90% of EU-1 / ZSM-5 composite molecular sieve and 0.5%-3% of heteropolyacid. The olefin catalytic agent is prepared by the following methods of: preparing or selecting the EU-1 / ZSM-5 composite molecular sieve, adding a binding agent to mold, and then adopting an impregnation method to load heteropolyacid to prepare the final catalytic cracking catalytic agent. The application of the catalytic agent in preparation of olefin by the naphtha catalytic cracking is that the reaction temperature is 500-700 DEG C, the reaction pressure is 0.01-0.5MPa, the naphtha quality airspeed is 0.3-2h<-1>, the water-oil volume ratio is 0.6-1.2, C5-C10 naphtha serves as a raw material, and total recovery of ethylene and propylene can achieve 67% (of the weight of naphtha). The olefin catalytic agent has the advantages of high olefin yield coefficient, stable catalytic agent, low reaction temperature and the like.

Description

technical field [0001] The invention relates to a catalyst for producing olefins by catalytic cracking of naphtha and its preparation method and application, in particular to a catalyst for producing ethylene propylene by catalytic cracking of naphtha and its preparation method and application. Background technique [0002] Since the beginning of the new century, the world’s demand for petrochemical raw materials and petrochemical products will continue to grow, and the demand for ethylene and propylene, which are the basic petrochemical raw materials, will continue to grow. However, the production capacity of conventional steam pyrolysis technology cannot meet the rapidly growing demand for propylene. Furnace steam pyrolysis is a process that consumes a lot of energy, and the process conditions are harsh. Compared with steam thermal cracking, the reaction temperature of naphtha catalytic cracking is about 50-200℃ lower than the standard cracking reaction. Therefore, it cons...

AI Technical Summary

Problems solved by technology

The above-mentioned catalyst is prepared by mechanically kneading the carrier and each component, and there is uneven mixing, which causes the problem of excessive local deactivation of the catalyst during the catalysis process.