A catalytic conversion process for making light olefins
By contacting the catalyst in a dense-phase fluidized bed and rapidly cooling it, the problem of low ethylene and propylene yields in low-carbon olefin production was solved, achieving efficient low-carbon olefin production and reduced energy consumption.
CN119524740BActive Publication Date: 2026-07-14CHINA PETROLEUM & CHEMICAL CORP +1
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2023-08-31
- Publication Date
- 2026-07-14
AI Technical Summary
Technical Problem
Existing low-carbon olefin production processes suffer from low ethylene and propylene yields, as well as problems related to thermal cracking and excessive energy consumption.
Method used
The process involves reacting olefin-rich feedstock with a thermally regenerated catalyst in a dense-phase fluidized bed, rapidly cooling the feedstock in a cooling zone, and quickly separating the gas and solid phases. Combined with a sliding valve to control the catalyst density, the thermal cracking reaction is suppressed, resulting in increased production of low-carbon olefins and reduced energy consumption.
Benefits of technology
It improved the yield of low-carbon olefins, especially the ethylene to propylene ratio, while reducing by-product yield and energy consumption.
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Figure CN119524740B_ABST
Abstract
The present application relates to a kind of catalytic conversion methods for preparing low carbon olefin, which includes the following steps: make the raw material rich in olefin with hot regenerated first catalyst in the dense phase fluidized bed bed of first reactor contact and carry out first catalytic conversion reaction, after reaction, the stream is cooled instantaneously through the cooling zone downstream of the dense phase fluidized bed bed, make after reaction, the stream is cooled to the target temperature of 450-530 DEG C and is separated and sent out the first reactor, obtain first reaction oil gas and first spent catalyst;From the slide valve of the bottom of the first reactor, part of the first catalyst in the dense phase fluidized bed bed is taken out so that the density of the first catalyst in the dense phase fluidized bed bed is 100-700 kg / m 3 The present application can obviously inhibit thermal cracking reaction by rapidly cooling after reaction and by slide valve controlling catalyst density in the dense phase fluidized bed bed, while increasing the yield of low carbon olefin, the yield of byproduct is reduced.
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