Catalyst for preparing propylene by disproportionation of ethylene and butane and preparation method of catalyst

Abstract

The invention discloses a catalyst for preparing propylene by disproportionation of ethylene and butane. The catalyst consists of 1-15% of active components and 85-99% of a carrier, wherein the active components comprise oxides of tungsten, molybdenum and rhenium; based on 100% of the total weight of the active components, the active components contain 80-100wt% of tungsten, 0-20wt% of molybdenum and 0-1wt% of rhenium; and the carrier is a zirconium oxide modified silicon dioxide carrier. The invention further discloses a preparation method of the catalyst. The preparation method comprises the following steps of: firstly, roasting a silicon dioxide carrier for 2-6 hours; then, dipping the roasted silicon dioxide carrier into a soluble zircon salt solution; subsequently, drying and roasting for 2-6 hours to obtain the zirconium oxide modified silicon dioxide carrier; then, dipping the zirconium oxide modified silicon dioxide carrier in a salt solution of tungsten, molybdenum and rhenium, and drying to obtain a carrier the surface of which is loaded by tungsten, molybdenum and rhenium; then, immobilizing the active components on the surface of the carrier through 0.1-6 M of an acidic precipitator, drying, and roasting for 2-6 hours so as to obtain the catalyst. The catalyst disclosed by the invention is high in catalytic efficiency and good in propylene selectivity.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a catalyst for preparing propylene by disproportionation of olefins. Background technique [0002] Propylene is one of the important basic raw materials of petrochemical industry, and it is also the petrochemical product with the fastest demand in the world. In 2010, my country's total propylene production capacity was 10.5 million tons, while propylene consumption was 19.05 million tons, with a gap of 8.25 million tons. Although the production capacity of propylene is increasing year by year, it is still far below the actual demand for propylene, and the gap between supply and demand is widening year by year. It is urgent to develop new ways to increase propylene production. With the increasing scarcity of petroleum, there is little room to increase the production of propylene through petroleum, and the production of propylene can only be increased by other means. In addition...

AI Technical Summary

Problems solved by technology

CN1403198A also studied the Mo / MCM-22 system, and found that adding Mg, K and other additives can improve the stability of the catalyst; Shanghai Petrochemical Research Institute has also carried out research and development of related olefin disproportionation technology, and its related patent CN101992119A uses MCM- 48 molecular sieve as carrier, WO 3 As the active component, the disproportionation reaction is carried out at 350 ° C, 3 MPa, and the molar ratio of ethylene / butene is 2. The conversion rate of butene can reach 78.2%, and the selectivity of butene to propylene can reach 98.0%. This technology not yet industrialized

Generally speaking, the technology of disproportionation of butene and ethylene to propylene in China is far behind that of foreign countries. Except for patent applications, there is no relevant industrialization report

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