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Method for preparing low-carbon olefins by using oxygen-containing compounds

A technology of low-carbon olefins and compounds, which is applied in the direction of producing hydrocarbons from oxygen-containing organic compounds, hydrocarbon cracking, chemical instruments and methods, etc., can solve the problem of low yield of low-carbon olefins, so as to improve yield and optimize energy The effect of distribution and utilization

Active Publication Date: 2015-06-03
中科催化新技术(大连)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is the problem that the yield of low-carbon olefins in the prior art is not high, and the purpose is to provide a new method for improving the yield of low-carbon olefins

Method used

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  • Method for preparing low-carbon olefins by using oxygen-containing compounds
  • Method for preparing low-carbon olefins by using oxygen-containing compounds
  • Method for preparing low-carbon olefins by using oxygen-containing compounds

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Embodiment 1

[0069] In the dense-phase fluidized bed reactor, there is one secondary pre-coking zone and three secondary reaction zones, and in the dense-phase fluidized bed regenerator, there are four secondary regeneration zones. Hydrocarbons above C4 enter the first secondary carbon pre-deposition zone in the dense-phase fluidized bed reactor, contact with the fully regenerated catalyst, and convert them into products including low-carbon olefins. At the same time, the amount of carbon deposition on the catalyst reaches At a certain value, a pre-carbon deposition catalyst is formed, and the pre-carbon deposition catalyst enters the reaction zone; raw materials containing oxygenated compounds enter the first to third secondary reaction zones in the dense-phase fluidized bed reactor in parallel, and the pre-carbon deposition Catalysts pass through the first to third secondary reaction zones sequentially in series, and the feedstock containing oxygenates is contacted with the pre-deposited ...

Embodiment 2

[0071]One secondary pre-carbon deposition area and two secondary reaction areas are set in the dense-phase fluidized bed reactor, and two secondary regeneration areas are set in the dense-phase fluidized bed regenerator. Catalysts above C4 enter the first secondary carbon deposit zone in the dense-phase fluidized bed reactor, contact with the fully regenerated catalyst, and convert them into products including low-carbon olefins. At the same time, the amount of carbon deposit on the catalyst reaches At a certain value, a pre-carbon deposition catalyst is formed, and the pre-carbon deposition catalyst enters the reaction zone; raw materials containing oxygenated compounds enter the first to second secondary reaction zones in the dense-phase fluidized bed reactor in parallel, and the pre-carbon deposition Catalysts pass through the first to second secondary reaction zones sequentially in series, and the feedstock containing oxygenates is contacted with the pre-deposited carbon ca...

Embodiment 3

[0073] A dense-phase fluidized bed reactor is provided with 1 secondary pre-carbon deposition zone and 5 secondary reaction zones, and a dense-phase fluidized bed regenerator is provided with 5 secondary regeneration zones. After mixing naphtha and hydrocarbons above C4, it enters the first secondary pre-coking zone in the dense-phase fluidized bed reactor, contacts with a fully regenerated catalyst, and converts it into products including low-carbon olefins. At the same time, the catalyst When the amount of carbon deposit reaches a certain value, a pre-carbon deposit catalyst is formed, and the pre-carbon deposit catalyst enters the reaction zone; raw materials containing oxygenated compounds enter the first to fifth secondary reaction zones in the dense-phase fluidized bed reactor in parallel At the same time, the pre-coke catalyst passes through the first to fifth secondary reaction zones sequentially in series, and the feedstock containing oxygenates contacts with the pre-c...

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Abstract

The invention relates to a method for improving the yield of low-carbon olefins in a process for preparing low-carbon olefins by using oxygen-containing compounds. More specifically, the invention provides a method for preparing low-carbon olefins by using oxygen-containing compounds, which is implemented by taking a multistage dense phase fluidized bed containing k (k is greater than or equal to 1) secondary carbon pre-deposition areas and n secondary reaction areas and taking a multistage dense phase fluidized bed regenerator containing m (m is greater than or equal to 2) secondary regeneration areas as a main body apparatus, through implementing a process of recycling hydrocarbons with C4 or above obtained by a separating section or adding naphtha, gasoline, gas condensate, light diesel oil, hydrogenation tail oil or kerosene into a reaction area. The method mainly solves the problem that in the prior art, the uniformity of carbon deposition amount and carbon content of a catalyst is difficult to control, so that the yield of low-carbon olefins is low.

Description

technical field [0001] The invention relates to a process for preparing low-carbon olefins, which has improved yield of low-carbon olefins. Background technique [0002] Low-carbon olefins, namely ethylene and propylene, are two important basic chemical raw materials, and their demand is increasing. Generally, ethylene and propylene are produced through petroleum routes, but due to the limited supply and high price of petroleum resources, the cost of producing ethylene and propylene from petroleum resources continues to increase. In recent years, people have begun to vigorously develop the technology of converting alternative raw materials into ethylene and propylene. The process of methanol conversion to olefins (MTO) has received more and more attention, and has achieved a production scale of one million tons. With the development of the world economy, the demand for low-carbon olefins, especially propylene, is increasing day by day. According to the analysis of CMAI, th...

Claims

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Application Information

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IPC IPC(8): C07C11/02C07C4/06C07C1/20B01J8/24
CPCY02P20/584Y02P30/20Y02P30/40
Inventor 刘中民叶茂张涛何长青王贤高赵银峰
Owner 中科催化新技术(大连)股份有限公司
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