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Method for preparing propylene through catalytic conversion of olefin raw material

A catalytic conversion and olefin technology, which is applied in catalytic cracking, hydrocarbon cracking, hydrocarbon production, cracking, etc., can solve the problems of lower catalyst mass concentration, high oil agent contact temperature, and lower reaction temperature, so as to shorten residence time and oil agent contact Effect of low temperature and reduced dry gas yield

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the riser reactor of catalytic cracking in the prior art, the concentration of the catalyst decreases with the increase of the gas volume. Generally speaking, the mass concentration of the catalyst in the second half of the riser decreases significantly, and the reaction temperature also decreases significantly at the same time. Therefore, it is difficult to fully crack the feedstock rich in C4-C8 olefins to produce small molecule olefins such as propylene
In addition, C4-C8 olefins are more difficult to convert than heavy oil raw materials, so a higher reaction temperature is required, and the corresponding oil contact temperature is also high, resulting in a higher dry gas yield

Method used

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  • Method for preparing propylene through catalytic conversion of olefin raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Take ZSP molecular sieve, kaolin, rentalite and pseudoboehmite according to the proportion, add decationized water and aluminum sol and beat for 120 minutes, and the pH value of the slurry is 3.0. The mixture was further beaten for 45 minutes, and then the resulting slurry was spray-dried at an inlet temperature of 500° C. and an exhaust gas temperature of 180° C. to obtain microspheres with an average particle diameter of 65 μm. The microspheres were calcined at 500°C for 1 hour to obtain 35wt% ZSP molecular sieve, 45wt% kaolin, 20wt% Al 2 o 3 The microsphere catalyst A.

[0045] Catalysts B-J were prepared according to the above method, and the compositions of the catalysts are shown in Table 1. The catalyst added with rectorite is finally calcined at 500-600° C. for 3-6 hours.

[0046] Table 1 Composition of Catalysts A-J

[0047] catalyst Molecular sieve type and content, wt% Kaolin, wt% Alumina, wt% ZSP molecular sieve silicon aluminum ratio ...

Embodiment 2~10

[0052] Examples 2-10 illustrate the effects of using the catalytic conversion method for raw materials rich in C4-C8 olefins provided by the present invention.

[0053] The catalyst was aged at 760°C with 100% steam for 10 hours, using a medium-scale test device, in which the inner diameter of the riser reactor was 18 mm and the height was 6 meters, and the inner diameter of the fluidized bed reactor was 64 mm and the height was 0.5 meters , the inner diameter of the dilute phase pipe at the outlet of the fluidized bed reactor is 30% of the inner diameter of the fluidized bed reactor. The loading capacity of catalyst in the compound reactor is 60 kilograms. The olefin raw material is sprayed into the fluidized bed reactor, which is mainly composed of 3.67wt% butane and 96.33wt% butene. The riser is used to convey the regenerated catalyst.

[0054] Reaction conditions and results are shown in Table 3-Table 5.

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Abstract

The invention relates to a method for preparing propylene through a catalytic conversion of an olefin raw material. The method comprises the steps of: introducing a raw material rich in C4<=> - C8<=> olefins into a fluidized bed reactor of a catalytic conversion device so as to contact and react with a catalytic cracking catalyst, separating a reaction product and a spent catalyst, subjecting the separated spent catalyst to steam stripping and coke burning regeneration for recycling use, and fractionating the separated product so as to obtain light olefins, gasoline, diesel oil, heavy oil and other low molecular saturated hydrocarbons. The catalytic conversion device consists of a riser reactor, a fluidized bed reactor, a settler, a stripper and a regenerator, wherein, the stripper is located under the fluidized bed reactor and is communicated with the bottom of the fluidized bed reactor, the outlet of the riser reactor is communicated with the bottom of the fluidized bed reactor, the outlet of which is communicated with the inlet of gas-solid separation equipment within the settler, and the catalyst outlet of the settler is communicated with the bottom of the fluidized bed reactor. The light olefins obtained by the method of the invention have high selectivity.

Description

technical field [0001] The invention relates to catalytic conversion of hydrocarbons, more specifically, to a method for selectively producing small molecule olefins, especially propylene, through catalytic cracking reaction of C4-C8 olefins in the presence of a catalyst containing mesoporous small molecule olefins with good selectivity. Background technique [0002] At present, low-carbon olefins (ethylene + propylene) mainly come from steam cracking units, and the rest mainly come from by-products of refineries (mainly catalytic cracking units). In addition, cracking reactions can occur through the contact of hydrocarbons, especially olefins, with zeolite-containing catalysts. Take light olefins. For example, CN1414068A discloses a method for producing ethylene and propylene by contacting low-value-added olefins with a ZSM-5 zeolite catalyst selected from a silicon-aluminum ratio of 20 to 70. The zeolite contained in the catalyst is modified by metal elements selected fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/18C07C11/06C07C4/06
CPCY02P20/52
Inventor 朱根权谢朝钢汪燮卿
Owner CHINA PETROLEUM & CHEM CORP
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