Method for increasing production of propylene and aromatics using moving bed technology

Abstract

The invention discloses a method for increasing the yield of propylene and aromatic hydrocarbon by adopting a moving bed technology. The method for increasing the yield of propylene and aromatic hydrocarbon by adopting the moving bed technology comprises the following steps: (1) introducing raw materials for a first reaction zone and a diluent into the first reaction zone to be contacted and reacted with an A-type molecular sieve based catalyst, wherein a first reaction zone material flow comprises hydrogen, C1-C5 hydrocarbon, an aromatic hydrocarbon component and a C5 or above non-aromatic hydrocarbon component; (2) treating the first reaction zone material flow, then introducing the treated first reaction zone material flow into a separation zone 1 to be separated, mixing one part of return material of the separation zone 1 with the first reaction zone raw materials in ratio, and introducing feedstock for a separation zone 2 into a separation zone 2 to be separated; and (3) introducing raw materials for a second reaction zone, a diluent and the rest return material, obtained in the step (2), of the separation zone 1 into the second reaction zone to be contacted with a molecular sieve based catalyst B, carrying out aromatization reaction for producing a second reaction zone material flow, and mixing the second reaction zone material flow with the first reaction zone material flow. The method for increasing the yield of propylene and aromatic hydrocarbon by adopting the moving bed technology has the advantages that on one hand, the catalyst stability is improved, and on the other hand, flexible yield increase of propylene and aromatic hydrocarbon is realized through multi-reaction zone regulation and circular hydrocarbon selective reprocessing.

Description

technical field [0001] The invention relates to a method for preparing propylene and aromatics, in particular to a reaction method for increasing the production of propylene and aromatics by using moving bed technology. Background technique [0002] Propylene and aromatics, especially light aromatics BTX (benzene, toluene, xylene) are important organic chemical raw materials. With the shortage of petroleum resources, the traditional petroleum route to obtain propylene and BTX aromatics may be replaced. Therefore, there is an urgent need for a new technology to replace the petroleum route to produce propylene and aromatics, such as coal-based or natural gas-based methanol production of propylene or aromatics. This technology not only alleviates the shortage of propylene and aromatics resource demand, but also improves the added value of methanol downstream products, and opens up a new path for the development of the industrial chain of coal and natural gas chemical industry. ...

AI Technical Summary

Problems solved by technology

CN 101993320 B discloses an aromatization process for the production of light aromatics, which uses mixed C4 and C9+ heavy aromatics as raw materials to catalyze molecular sieves to produce more aromatics under the condition of non-hydrogenation. CN 101607858B introduces a methanol / The method for preparing aromatics and co-producing propylene from dimethyl ether, after separating propylene from the fixed-bed reaction product, the remaining components undergo the second-step aromatization reaction, this method can produce more aromatics, especially xylene components, but this method The yield of propylene and aromatics is difficult to control

[0009] Among the existing methanol conversion technologies, there is no process that can selectively and flexibly increase the production of either propylene or aromatics. Using the characteristics of the ZSM-5 molecular sieve catalyst and the selective re-refining of the product can maximize the economic benefits of the product

Images