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Catalyst for preparing propylene by directly converting ethylene, and application method thereof

A catalyst and ethylene technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low propylene yield and achieve high propylene yield, strong acidity, and good stability

Active Publication Date: 2014-06-11
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a catalyst and application method for the direct conversion of ethylene to prepare propylene, which can solve the problem of low yield of propylene. with high catalytic activity

Method used

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  • Catalyst for preparing propylene by directly converting ethylene, and application method thereof
  • Catalyst for preparing propylene by directly converting ethylene, and application method thereof
  • Catalyst for preparing propylene by directly converting ethylene, and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of the catalyst for the direct conversion of ethylene to propylene provided by the invention comprises the following steps:

[0023] 1) Treat the original powder of H-SSZ-13 catalyst (the main components are Si, O and Al, where SiO2 / Al2O3=27) under the condition of concentrated acid (concentrated nitric acid, concentrated hydrochloric acid or acetic acid), and the treatment temperature is 25 -150℃, the treatment time is 5-60h;

[0024] 2) The acid-treated catalyst is calcined in an air atmosphere in a muffle furnace for 4-6 hours, and the calcining temperature is 500-600°C.

[0025] The former powder of H-SSZ-13 catalyst described in the present invention is purchased from Tianjin Shenneng Technology Co., Ltd., silicon-aluminum ratio (SiO 2 / Al 2 o 3 ) is 27; the obtained H-SSZ-13 is then treated with concentrated acid (that is, the catalyst is placed in a concentrated acid solution and stirred at different temperatures) to obtain a catalyst f...

Embodiment 2

[0039] Weigh 1.0g each of catalyst samples X-5, Y-5 and C-5 after being treated with nitric acid, hydrochloric acid and acetic acid for 5 hours respectively, press into tablets and sieve, weigh 0.1g of 20-40 mesh samples and put them into the reaction device , the carrier gas flow rate is 20ml min -1 , the reaction pressure is normal pressure, and the space velocity of ethylene is 1.0h -1 , the reaction temperature is 400°C. The sampling time was 15 minutes, and the test results of the catalytic reaction are shown in Table 2.

[0040] The test results show that the conversion rate of ethylene and the selectivity of propylene are also different under the same reaction conditions for samples treated with different types of acids. Among them, the samples treated with nitric acid and acetic acid had better activity in ethylene conversion reaction. The conversion rate of ethylene reaches above 80%, and the selectivity of propylene also reaches above 55%.

[0041] Table 2 Test r...

Embodiment 3

[0044]Weigh samples X-5, X-10, X-20, X-40, X-60 and C-5, C-10, C-20, C-40, C-60 each 1.0g, after tableting and sieving, weigh 0.1g and put them into the reaction device, the carrier gas flow rate is 20ml min -1 , the reaction pressure is normal pressure, and the space velocity of ethylene is 1.0h -1 , the reaction temperature is 400°C. The sampling time was 15 minutes, and the test results of the catalytic reaction are shown in Table 3.

[0045] Table 3 Test results of ethylene to propylene

[0046]

[0047]

[0048] The test results showed that with the increase of acid treatment time, the conversion rate of ethylene and the selectivity of propylene increased first and then decreased, among which the acid treatment time of 40 h was the most suitable. The ethylene conversion rate on X-40 is 84.7%, and the propylene selectivity is 62.2%; the ethylene conversion rate on C-40 is 82.6%, and the propylene selectivity is 60.9%.

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Abstract

The invention discloses a catalyst for preparing propylene by directly converting ethylene, and an application method of the catalyst. An H-SSZ-13 zeolite molecular sieve is taken as an original catalyst and can be directly used for the reaction for preparing the propylene by modulating the ethylene by an acid treatment method, so that the problems of low ethylene conversion rate and poor propylene selectivity can be solved. The original catalyst is easy to obtain, and the catalyst is good in stability and simple in post-processing method; the obtained catalyst can continuously react on a fixed bed, is high in activity and long in service life and can be used for the industrial production of preparing propylene by directly converting ethylene.

Description

technical field [0001] The invention relates to a catalyst and an application method for directly transforming and preparing propylene by using ethylene as a raw material. Background technique [0002] As an important organic chemical raw material, propylene is mainly used to produce acrylonitrile, propylene oxide, acetone, synthetic resin, synthetic rubber and various fine chemicals. In recent years, as my country's methanol-to-olefins (MTO) projects continue to heat up, the output of ethylene and propylene is also increasing year by year. However, since the growth rate of propylene demand has been higher than that of ethylene, and the supply of propylene has been in short supply and the price has been rising. Therefore, domestic and foreign scientific research institutions and large companies have been very active in the development of technology to expand the source of propylene, but most of them focus on the disproportionation of ethylene and butene to propylene. [00...

Claims

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Application Information

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IPC IPC(8): B01J29/70B01J35/10C07C11/06C07C2/00
CPCY02P20/52
Inventor 关乃佳戴卫理李兰冬武光军
Owner NANKAI UNIV
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