Molecular sieve catalyst micro powder reutilization method as well as obtained product and application thereof

Abstract

The invention relates to a reutilization method of molecular sieve catalyst micro powder generated in the reaction process of olefin preparation from methanol, which is characterized in that firstly, the molecular sieve catalyst micro powder is calcinated for removing deposit carbon in the catalyst micro powder, the separation of molecular sieves from binding agents, fillings and the like is realized through a crushing method, substances such as separated and stripped binding agents, substrate carriers and the like are used as filling agents in a novel catalyst, then, pure SAPO-34 molecular sieves and auxiliary agents such as the binding agents, the fillings and the like are mixed and formed with treated catalyst micro powder in a proper mode, and the reutilization of the recovered catalyst micro powder is realized by the method, so the catalyst loss is reduced, and the catalyst cost is correspondingly reduced. The catalyst obtained in the method has the same catalytic performance (such as catalytic activity, selectivity, intensity and the like) as the homologous catalyst.

Description

technical field [0001] The invention relates to the field of molecular sieve catalysts, more specifically, to a method for reusing molecular sieve catalyst micropowder and the obtained products and applications. Background technique [0002] The new series of silicoaluminophosphate molecular sieves (US patents US4440871, US4499327) developed by the United Carbide Corporation (UCC) in 1984-SAPO-n series molecular sieves are based on organic amines as templates, hydrated alumina and phosphoric acid. 1. Silica sol is an aluminum source, a phosphorus source and a silicon source. First, an organic amine / aluminum phosphate / silicon complex with a microporous phase is obtained by hydrothermal crystallization, and then the template agent (organic amine) is removed by roasting. SAPO-34 molecular sieve is one of them, its structure is similar to chabazite, it has three-dimensional intersecting channels, the pore diameter is about 0.38nm, and it belongs to the cubic crystal system. Due...

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Problems solved by technology

It is reported in the patent CN1207097C on the reuse of catalyst micropowder for methanol to olefins, which uses part of the attrition catalyst particles recovered from the circulating fluidization reaction to mix with some SAPO-34 molecular sieves, binders, carriers, and peptizers to form a uniform mixed slurry. Then, the catalyst for the reaction of methanol to olefins is prepared by a spray drying process, which is beneficial to minimize the waste through the recovery and application of abrasive particles, thereby reducing the problems related to environmental and economic constraints, but the patent does not consider the carbon deposition in the catalyst powder. 1. Catalyst micropowder contains binder and additive components, and the distribution of these components in catalyst micropowder is quite different, and there is a layer of filler outside the filler, which will also have a great impact on the selectivity and activity of molecular sieves. The catalyst obtained by mixing directly with SAPO-34 molecular sieve, binder, matrix carrier and peptizer without treatment and spray molding cannot reach the strength and catalytic performance of the original catalyst

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