Catalyst composition for preparing low-carbon olefin by using inferior oil and preparation method thereof

Abstract

The invention discloses a catalyst composition suitable for preparing low-carbon olefin by using inferior oil and a preparation method thereof. The catalyst composition is characterized by consisting of two microspheres A and B, wherein the microsphere A is a shape-selecting cracking microsphere A consisting of 15-60wt% of ZSM-5 molecular sieve, 15-35wt% of silica sol in SiO2 and the balance of kaolin, and the wear strength of the microsphere A is not more than 2.0wt%; the microsphere B is a low-cost inferior oil conversion microsphere B consisting of 5-20wt% of Y molecular sieve, 10-30wt% ofsilica sol in SiO2, 0.5-5 wt% of pore forming agent and the balance of kaolin, the pore volume of the microsphere B is 0.1-0.5 ml / g, and the wear strength of the microsphere B is 2.5-4.5wt%; and the microspheres A and B are respectively shaped as a microsphere with a mean grain size of 50-80 microns by pulping and spray drying, and the adding proportions of the microspheres A and B are adjusted according to the run loss rate difference in the device so as to maintain the weight ratio of the microsphere A to the microsphere B of 1-(5: 1) in a system catalyst inventory. The composition is specifically suitable for the catalytic cracking / splitting process for fecundating low-carbon olefin by using inferior raw oil, and has the advantages of high low-carbon olefin yield, heavy metal pollutionresistance and low catalyst consumption cost.

Description

technical field [0001] The invention relates to a catalyst for catalytic conversion of petroleum hydrocarbons, in particular to a catalyst composition for producing low-carbon olefins from inferior raw material oil under catalytic cracking / cracking conditions and a preparation method thereof, belonging to the field of petrochemical catalysts. Background technique [0002] Low-carbon olefins such as ethylene, propylene and butene are important organic chemical raw materials, which are widely used in the manufacture of polyolefins and as raw materials for the production of bulk chemical products. With the further development of the chemical industry and the plastic products industry, the demand for low-carbon olefins has grown rapidly, and a process route for the production of low-carbon olefins by catalytic cracking of paraffin-based vacuum gas oil has been developed, which provides a solid foundation for the production of low-carbon olefins from heavy raw materials An effect...

AI Technical Summary

Problems solved by technology

[0007] With the rapid increase in the cost of raw materials brought about by the rapid development of the industrial economy, it is required to reduce the purchase and use of catalysts while refining heavy and inferior raw materials. Making full use of the high-cost ZSM-5 molecular sieve active components is the key to reducing the cost of catalysis. The catalytic cracking catalysts reported in the prior art are all made of composite ZSM-5 and Y molecular sieves on a catalyst microsphere particle. The method of making the composition of the catalyst uniform by the active components has the disadvantages that it cannot solve the mismatch problem of the two main active components well, and fails to make full use of the high-value ZSM-5 molecular sieve structure and relatively slow activity decay and its unique pore structure. Anti-coking characteristics

Two microsphere compositions with different molecular sieve active components and functions are used, and the ratio is flexibly adjusted according to the production conditions of the catalytic cracking / cracking unit and the difference in the loss rate of the two microspheres, so as to adapt to the process of producing low-carbon olefins from inferior oil raw materials and alleviate heavy metals Pollution and reduction of catalyst usage cost, not reported in the prior art