Methanol-to-olefins reaction product gas and catalyst separation system and separation process

Abstract

The invention provides a methanol-to-olefins reaction product gas and catalyst separation system and separation process. High-temperature catalyst removal equipment and an oxide washing tower are arranged at the downstream position of a methanol-reaction gas heat exchanger, an original reaction gas three-stage cyclone separator is cancelled, simplicity and high efficiency of a catalyst powder removal process are achieved, secondary water pollution caused by a quenching tower is eliminated, requirements on process indexes in methanol-to-olefins and olefin separation are met, and a system operating cycle is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a process for removing catalyst fine powder entrained in reaction product gas of a methanol-to-olefins industrial device. Background technique [0002] Ethylene and propylene are important basic raw materials for the chemical industry. Traditional olefin production routes consume large amounts of petroleum. With the rapid growth of demand for olefins in the chemical industry, the contradiction between supply and demand has become increasingly prominent. To this end, a new process for producing ethylene and propylene using coal and natural gas as raw materials has been developed. The key technology of this new process is the methanol-to-olefins (MTO) technology, which mostly adopts the reaction regeneration system in the form of a fluidized bed, and the common problem of the fluidized bed is that the reaction product gas will entrain fine catalyst powder, and the reactio...

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Problems solved by technology

The shortcomings or problems of the separation process of this system are: the separation effect of the three-stage cyclone separator in the reactor is poor

The design purpose of the three-stage cyclone separator of the reactor is to recover the catalyst lost from the reactor during the start-up and shutdown phase. Through the investigation of the actual operating conditions of the device, it is found that the catalyst fine powder recovered from the three-stage cyclone separator of the reactor is not much. Poor gas-solid separation

[0004] In addition, the pressure drop of the reaction gas through the three-stage cyclone separator has reached more than 200Pa. Due to the increase in pressure drop, the <10μm catalyst fine powder carried by the reaction gas in the methanol-reaction gas heat exchanger will be deposited, resulting in methanol-reaction Fouling on the inner wall of the gas heat exchanger reduces heat transfer efficiency and system separation efficiency

And requires professional equipment and cleaning agent (Ca(OH) 2 ) to clean up fouling, it is easy to introduce exogenous chemical pollution, which reduces the system operation cycle. Therefore, it is urgent to optimize the product gas and catalyst separation system

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