Method and equipment for improving selectivity of low-carbon olefins

Abstract

The invention discloses a method and equipment for improving the selectivity of low-carbon olefins. The method comprises the following steps that 1) an oxygen-containing compound raw material enters areactor, contacts with a regeneration catalyst from a pre-reaction section, and is subjected to an exothermic reaction; 2) after the carried catalyst is removed from the reaction gas in the step (1),the obtained reaction gas enters the built-in separation facility of the reactor to remove the carried catalyst, and then is led out; 3) the spent catalyst subjected to carbon deposition after the reaction in the step 1) enters a regenerator, and is subjected to scorching regeneration; 4) the spent catalyst in the step 3) enters a regeneration stream stripping device, and is subjected to steam stripping cooling, and the cooled catalyst enters a pre-reaction section; and 5) a pre-reaction medium is gasified, and the gasified pre-reaction medium enters the pre-reaction section, is subjected toan endothermic reaction with the regenerated catalyst, and then enters the reactor. The method and the equipment provided by the invention have the advantages that by arranging the pre-reaction section, the occurrence of non-target reaction is reduced, and the selectivity of low-carbon olefin is improved; and the bush is arranged in the reactor, so that the dilute phase space of the reactor is shortened, and the selectivity of low-carbon olefin is improved.

Description

technical field

[0001] The invention belongs to the technical field of olefin preparation, and relates to a method and equipment for improving the selectivity of low-carbon olefins in the continuous reaction and regeneration process of mainly producing low-carbon olefins using oxygen-containing compounds as raw materials. Background technique

[0002] Light olefins (ethylene, propylene, butadiene) and light aromatics (benzene, toluene, xylene) are the basic raw materials for petrochemicals. The traditional production route of ethylene and propylene is through the cracking of naphtha, which has the disadvantage of being overly dependent on petroleum. Methanol-to-Olefin (MTO for short) is another process route for producing olefins such as ethylene and propylene from methanol. At present, the development of process technology has become mature. The industrialization of MTO technology has opened up a new process route for the production of petrochemical basic raw materials by ...

Images