Method and equipment for pre-hydrocarbon pooling of catalyst

Abstract

The invention belongs to the technical field of low-carbon olefin preparation, and discloses a catalyst pre-hydrocarbon pooling method, which comprises the following steps that a regenerated catalyst enters into a pre-hydrocarbon pooling facility, and is subjected to pre-hydrocarbon pooling reaction with an activating medium to form a hydrocarbon pool active species, and the regenerated catalyst after pre-hydrocarbon pooling enters a conversion reactor for recycling. According to the invention, the pre-hydrocarbon pooling facility is arranged to carry out pre-hydrocarbon pooling treatment on the regenerated catalyst, so that the regenerated catalyst forms hydrocarbon pool active species and carbon deposit before entering the oxygen-containing compound conversion reactor, and the hydrocarbon pool active species distribution and carbon deposit distribution of the catalyst in the conversion reactor are improved so as to shorten or eliminate the reaction induction period and improve the catalytic activity and selectivity of the reaction for preparing the low-carbon olefin from the regenerant oxygen-containing compound.

Description

technical field [0001] The present invention relates to a method and equipment for improving the selectivity of oxygenate conversion to light olefins, more specifically, a method for catalyst pre-hydrocarbon pooling (or called pre-activation) and equipment thereof. Background technique [0002] Light olefins, defined here as ethylene and propylene, are two important basic organic chemical raw materials. In recent years, people have begun to vigorously develop alternative energy conversion technologies, such as the process of converting oxygenated compounds to olefins (OTO). Oxygenated compounds include methanol, ethanol, dimethyl ether, methyl ethyl ether, etc. Due to the wide range of sources of oxygenates and the economical efficiency of the process for producing low-carbon olefins, the process of converting oxygenates to olefins (OTO), especially the process of converting methanol to olefins (MTO) has received great attention. more and more attention. [0003] Oxygenate...

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Problems solved by technology

[0015] In summary, the "hydrocarbon pool" active species in industrially applied circulating fluidized bed reactors is dynamic and changing (its type and quantity are changing with reaction conditions (mainly reaction temperature)), so The catalyst bed not only has the problem of carbon deposit distribution, but also has the problem of uneven distribution of active species in the "hydrocarbon pool", which will inevitably affect the catalytic activity and selectivity of the reaction of methanol to light olefins

In fact, this is the main reason for the low yield of low-carbon olefins in the MTO unit

But for a long time, the above-mentioned problems have not been discovered by people, and no one has carried out special research and reports so far.

[0017] At the same time, the high-temperature regenerated catalyst directly enters the conversion reactor, and there is a temperature difference of hundreds of degrees (usually 150-300°C) with the catalyst in the conversion reactor, which will cause local overheating of the catalyst bed (the high-temperature regenerated agent itself and its surroundings), This leads to many side reactions in the conversion reaction process, a large amount of coke, and poor selectivity of low-carbon olefins

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