Method for performing multi-stage cyclic utilization on methanol to olefin catalyst synthetic wastewater

Abstract

The invention relates to a method for performing multi-stage cyclic utilization on methanol to olefin catalyst synthetic wastewater. The method comprises the following steps: adding a phosphorus source, a silicon source, an aluminum source, water and an organic amine template agent into synthetic waste water according to a certain proportion, preparing initial gel, performing crystallization, distilling the crystallization product to recover part of organic amine and water, performing centrifugal filtration, mixing the filter residue obtained through filtering, a carrier, a binding agent and part of synthetic wastewater, performing spray granulation and calcining to obtain a catalyst finished product, wherein the filtrate serving as the synthetic wastewater is divided into three parts which are used for performing initial gel synthesis, performing spray granulation and producing composite fertilizer correspondingly. The method has the advantages of capability of saving cost, high controllability, high wastewater utilization rate and high environmental friendliness; and the catalyst product has excellent and stable properties.

Description

technical field [0001] The invention belongs to the technical field of catalyst synthesis, and in particular relates to a method for multistage recycling of methanol-to-olefin catalyst synthesis wastewater. Background technique [0002] Coal-to-olefins technology cleanly converts coal into resin products and rubber products with higher added value along the route of "coal→syngas→methanol→olefin→polyolefin", which can realize economic benefits, social benefits and national energy strategy security. Multiple benefits. One of its technical cores is methanol-to-olefins catalyst technology, which has been independently developed and produced in my country in recent years. [0003] The current methanol-to-olefin catalysts are mainly silicoaluminophosphate molecular sieves, which are synthesized by combining phosphorus sources (such as orthophosphoric acid, metaphosphoric acid, etc.), silicon sources (such as silica sol, tetraethyl orthosilicate, etc.), aluminum sources (such as p...

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Problems solved by technology

This method has high requirements on the solubility, cost, and toxicity of the auxiliary templating agent, and there are certain difficulties in application.

Chinese patent CN102190312A discloses a method for recycling molecular sieve crystallization mother liquor, and Chinese patent CN106542548A discloses a method for preparing SAPO-34 molecular sieve by using SAPO-34 crystallization mother liquor. It is used in the synthesis of molecular sieves, but it is difficult to control the ratio of raw materials after the mother liquor is reused, and it is easy to produce miscellaneous crystals after repeated reuse, which will affect the quality of the catalyst

[0006] In the patent documents reported above, although the methanol to propylene catalyst synthesis wastewater is proposed for recycling, a highly controllable and systematic multi-stage recycling method has not been proposed for increasing the reuse ratio of wastewater.

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