Alkylation catalyst and application thereof

Abstract

The invention specifically provides an alkylation catalyst and application thereof, belonging to the field of catalysts. The alkylation catalyst comprises a modified IM-5 molecular sieve and a binder, wherein the modified IM-5 molecular sieve has a mesoporous area of 150 m<2> / g or above and a mesoporous volume of 0.5 cm<3> / g or above. The catalyst provided by the invention has the advantages of slow inactivation rate, high catalytic activity and good selectivity; e.g., when the catalyst is used under a high space velocity condition, activity stability of the catalyst is still long, and the catalyst still has a high benzene conversion rate in a reaction at low temperature. Thus, the catalyst can be used under the high space velocity condition, has high catalysis efficiency, is reactable at a low temperature, shows good activity stability, reduces energy consumption of alkylation and has prolonged service life.

Description

technical field [0001] The invention relates to an alkylation catalyst and the application of the alkylation catalyst in an alkylation reaction. Background technique [0002] In recent years, with the development of automobile preparation technology and the improvement of automobile exhaust emission standards, the requirements for the octane number and cleaning performance of motor gasoline have become increasingly stringent. According to the unified requirements of the country, the National IV gasoline standard will be fully implemented in China from January 1, 2014, and the sulfur content in gasoline will be strictly limited. The sulfur content is less than 0.005% (mass fraction), but the benzene content in gasoline is still controlled at <1% (volume fraction), the total aromatics content is controlled at 35% (volume fraction). [0003] At present, refineries mostly use hydrogenation to reduce sulfur and olefins, which will inevitably reduce the octane number of gasoli...

AI Technical Summary

Problems solved by technology

Lu Lu et al. (Synthesis of multi-level pore ZSM-5 molecular sieve and research on catalyzing the alkylation reaction of benzene and methanol, Acta Petroleum Sinica, 2012, 2: 111-115) used ZSM-5 molecular sieve with multi-level pores to catalyze benzene / methanol Alkylation reaction, compared with ordinary ZSM-5 molecular sieve, can increase the benzene conversion rate by about 9%, but its benzene conversion rate is still not high enough, only reaching 55%

[0008] CN102600887A reported that MCM-22 molecular sieves loaded with alkaline earth and rare earth metals catalyzed the benzene / methanol alkylation reaction. Under the condition that the molar ratio of benzene to methanol was 2, the alkylation rate of methanol reached about 90%, but the conversion of benzene Only 45%

In CN102205251A, when HIM-5 molecular sieve is used, the conversion rate of toluene can reach about 55%, and the conversion rate of toluene is significantly reduced by phosphorus modification of the molecular sieve

For ZSM-5, phosphorus modification also leads to a significant decrease in toluene conversion

Images