A kind of start-up method of methanol-to-light olefins unit

Abstract

The invention relates to a work-starting method of an apparatus for producing low carbon alkene from methanol. The method comprises: (a) heating a reactor (4) to a first preset temperature T1 and heating a reactivator (5) to a second preset temperature T2 in advance; (b) adding a catalyst (18) into the reactor (4) and the reactivator (5), adjusting the temperature of the reactor (4) to a third preset temperature T3 and adjusting the temperature of the reactivator (5) to a forth preset temperature T4; (c) enabling methanol heated to a preheating temperature TP to enter the reactor (4), when the reactor temperature reaches a fifth preset temperature T5, starting fluidization in the reactor (4) and the reactivator (5); (d) adjusting reaction system heat to timely balance operation and further to enable various reaction parameters to reach requirements; and (e) making the apparatus work normally, wherein the reactor (4) and the reactivator (5) respectively employs respective heat sources and heating mediums for heating in the step (a) and / or the step (b). The method is efficient, rapid and stable.

Description

technical field [0001] The invention relates to a start-up method of a methanol-to-low-carbon olefins device. Background technique [0002] With the sustained and rapid economic development, the consumption of chemicals produced with ethylene and propylene as basic raw materials has been increasing year by year. For example, China’s ethylene and propylene have been in short supply for a long time, and the imports of chemicals produced using ethylene and propylene remain high. Almost all ethylene and propylene in the world are produced using light hydrocarbons, condensate oil, and naphtha as raw materials. Since China’s dependence on foreign oil has exceeded 50%, non-petroleum routes are used to produce methanol, and then methanol is converted through catalytic conversion. It is of great significance to produce light olefins such as ethylene and propylene. [0003] In today's petrochemical industry, ethylene is almost all obtained through steam cracking of petrochemical raw ...

AI Technical Summary

Problems solved by technology

During the start-up, the refinery unit can use the regenerator to inject fuel oil to provide heat, but the MTO unit cannot use this method, so the source of heat has become a big problem

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