Method for prolonging catalyst use period in hydrocarbon polymerization aromatization technique

Abstract

The invention discloses a method for prolonging catalyst use period in a hydrocarbon polymerization aromatization technique. The method comprises the following steps: sending a C4 raw material into a polymerization reactor, and reacting under the action of an acidic catalyst to generate aromatic hydrocarbons and liquefied gas. The method is characterized by adding methanol into the polymerization reactor. The modified raw material and methanol are mixed and fed, and the methanol reaction product is weakly acidic, so the neutralization between acid and alkali releases heat. The weak alkalinity of the raw material is neutralized, thereby solving the problem of catalyst poisoning, prolonging the catalyst use period, and saving the operating cost. The methanol reaction generates water vapor, thereby protecting the catalyst activity center, and enhancing the product yield. The modification prolongs the catalyst use period, increases the regeneration rate, avoids catalyst poisoning and inactivatation, and protects the catalyst. The method only needs to prepare the methanol feed line, and thus, is low in investment cost and simple to operate; and meanwhile, the method ensures the system safety and stability, and provides guarantees for long-term operation.

Description

technical field [0001] The invention relates to a method for prolonging the service period of a catalyst in a hydrocarbon superposition aromatization process. Background technique [0002] Hydrocarbon stacking aromatization process is that the carbon four components containing a small amount of olefins are heated by a heating furnace and sent to a stacking reactor to react under the action of an acidic catalyst (such as OIL-1 catalyst), and the olefins and some alkanes in it produce aromatics And liquefied gas, thereby improving the utilization rate of olefins in the carbon four components, accompanied by a small amount of by-products. Due to the different processes of purchased raw materials, if the raw materials are alkaline, the exchange capacity of the catalyst will be reduced, the conversion rate of olefins will be reduced, and the yield of superimposed products will be affected. Moreover, the presence of alkaline substances intensifies the carbon deposition of the cat...

AI Technical Summary

Problems solved by technology

Due to the different processes of purchased raw materials, if the raw materials are alkaline, the exchange capacity of the catalyst will be reduced, the conversion rate of olefins will be reduced, and the yield of superimposed products will be affected.

Moreover, the presence of alkaline substances intensifies the carbon deposition of the catalyst, shortens the service life of the catalyst, and the OIL-1 catalyst will be poisoned and deactivated under the action of alkaline substances for a long time

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