Operating method for olefin conversion device

Abstract

The invention belongs to an operating method for an olefin conversion device and relates to a device for preparing olefin such as methanol to olefin (MTO) and methanol to propylene (MTP) by using organic oxides such as methanol, dimethyl ether and the like. The method is characterized by comprising the following steps that: when the device is operated, catalysts of a reactor 2 and a regenerator 3are respectively introduced from respective catalyst tank and are added in two paths; and the catalysts respectively added into the reactor and the regenerator are heated depending on an external heat source and a heating medium which are independently arranged, namely, the reactor 2 is provided with an operating steam superheater 1 to heat the catalyst by using high-temperature steam and the regenerator 3 is provided with an auxiliary combustor to heat the catalyst by using high-temperature air. When added, the catalysts are not transferred from the regenerator 3 to the reactor 2, namely thecatalysts are not transferred between the reactor and the regenerator.

Description

technical field [0001] The invention belongs to a start-up method of an olefin conversion device, and relates to a device for preparing olefins (such as MTO and MTP) from organic oxides such as methanol and dimethyl ether. Background technique [0002] Light olefins, defined here as ethylene, propylene, butene, and mixtures thereof, are feedstocks for the production of many important chemicals and polymers. Light olefins are typically produced by cracking petroleum raw materials. Due to the limited supply of competitive petroleum raw materials and the increasing international prices, the production of light olefins from petroleum raw materials is becoming less and less economical, and the production cost is also increasing rapidly. For this reason, The development of technology for producing light olefins based on alternative raw materials is becoming increasingly urgent and playing an increasingly important role. [0003] Important alternative feedstocks for the production...

AI Technical Summary

Problems solved by technology

[0017] CN 1836027A provides suitable means for heating and loading activated molecular sieves to prevent loss of catalyst activity that can occur due to contact with water molecules. Catalyst deactivation occurs at high temperatures above 600 ° C. It is not easy to deactivate the catalyst at a low temperature; CN 101130466A is a method of transporting methanol or dimethyl ether raw materials to the reactor after the temperature rises to 200°C or above 300°C, and the method of rapidly raising the temperature of the reaction system device by means of the exothermic reaction. There is a large amount of catalyst in the reaction system, and it takes a long time to heat the catalyst bed of the two-system system to 200°C or above 300°C with an auxiliary heat source for start-up, and the regeneration system also maintains this temperature at this time, so that it cannot be burned. conduct

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