Method for upgrading and reusing catalyst fine powder in methanol to olefins reaction

Abstract

The invention discloses a quality improvement and recycle method of fine catalyst powder for a methanol-based olefin preparation reaction. The method comprises 1, roasting fine catalyst powder to remove carbon deposit in the fine catalyst powder, 2, mixing the roasted fine catalyst powder, a silicon source, an aluminum source, a phosphorus source, an organic amine template and deionized water, or adding the roasted fine catalyst powder into a SAPO-34 molecular sieve crystallization raffinate to obtain a mixture, and carrying out crystallization and centrifugation to obtain a product, and 3, mixing the product, deionized water, a binder and a matrix to obtain slurry, carrying out stirring, grinding and spray molding and carrying out roasting to obtain the catalyst microspheres for methanol-based olefin preparation. The quality improvement and recycle method has the advantages of high catalytic activity after regeneration, good selectivity and high strength.

Description

technical field [0001] The invention relates to a method for upgrading and reusing fine catalyst powder in methanol-to-olefins reaction. Background technique [0002] Methanol-to-olefins technology (hereinafter referred to as MTO technology) is a high-end core technology in the field of energy and chemical industry in the world. It uses methanol made from coal or natural gas as a raw material, which is processed and transformed into an important chemical raw material - light olefins (ethylene and propylene) through MTO technology, and then a large number of olefin chemical products are derived. In view of my country's national conditions of "short of oil, less gas and rich in coal", this is a revolutionary industrial technology to replace oil with coal. Become the core technology of the country's major energy strategy. However, the core of this type of technology lies in the catalyst. Since the reaction of methanol to olefins is carried out in a fluidized bed reactor, the ...

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Problems solved by technology

[0006] Chinese patent CN1207097C reports that the catalyst fine powder recovered by partial circulating fluidization reaction is mixed with some SAPO-34 molecular sieves, binders, carriers, and peptizers to form a uniform slurry, and then the methanol-to-olefins catalyst is prepared by a spray drying process. The recovery and application of the catalyst are beneficial to minimize waste, thereby reducing environmental and economic constraints, but the patent does not consider the fine catalyst powder containing carbon deposits, binders and other components, and the distribution of these components in the fine catalyst powder is different Larger, without treatment, the catalyst prepared by mixing and spraying with SAPO-34 molecular sieve, binder, carrier, etc. cannot achieve the strength and catalytic performance of the original catalyst

However, in the reaction of methanol to olefins, the catalyst is exposed to a harsh hydrothermal environment for a long time, and the structure of the active component SAPO-34 molecular sieve will be partially destroyed, and the recovery of the catalyst performance cannot be truly achieved through the above methods

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