Method for preparing propylene by ethylene alkylation

A technology for ethylene alkylation and ethylene, which is applied in the field of propylene production, and can solve the problems of reducing propylene selectivity and reducing economic efficiency

Active Publication Date: 2008-02-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the process of producing propylene by co-feeding ethylene and alkylating agent, there are side reactions to generate higher carbon number olefins, which reduce the selectivity of propylene and make high-value ethylene and other raw materials to be produced Low-value products such as butenes, reducing the economics of the process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Catalyst A consists of a mixed matrix of SAPO-34 and silica, alumina and clay, and is calcined at 550°C for 4 hours, and the content of SAPO-34 is 30%.

[0029] The reaction was carried out in a fixed-bed microreactor. The reaction conditions are as follows: the loading amount of catalyst A is 1g, the reaction temperature is 450°C, the raw material is a mixture of methanol and ethylene, the methanol content (Cmol%)=6-30%, the reaction contact time is 1s, and the reaction pressure is 0.1MPa. The reaction product was analyzed by VarianCP-3800 gas chromatography, Plot column and hydrogen flame detector, and the sampling time was 6 minutes.

[0030] The reaction results are shown in Table 1. Under the above reaction conditions, the selectivity of propylene in the product is 58-60%.

[0031] The reaction result of table 1 embodiment 1

[0032] Into the reactor composition / Cmol%

[0033] *Other products include C 1 -C 3 Alkanes and CO x Wait

Embodiment 2

[0042] Catalyst is the same as embodiment 1

[0043] The reaction was carried out in a fixed-bed microreactor. The reaction conditions are as follows: the loading amount of catalyst A is 1g, the reaction temperature is 450°C, the raw material is a mixture of methanol and catalytic cracking dry gas containing ethylene, the dry gas composition is shown in Table 3, and the feed ethylene / methanol ratio is 1.6-7.0 , the reaction contact time is 1s, the reaction pressure is 0.1MPa, the reaction product is analyzed by Varian CP-3800 gas chromatography, Plot column and hydrogen flame detector, and the sampling time is 6 minutes.

[0044] The reaction results are shown in Table 4. Under the above reaction conditions, the selectivity of propylene in the product is 59-66%.

[0045] Table 3 Analysis of dry gas composition containing ethylene

[0046]

[0047] The reaction result of table 4 embodiment 2

[0048] Raw material ethylene / methanol ratio

[0049] *Other pr...

Embodiment 3

[0059] Catalyst is the same as embodiment 1

[0060] The reaction was carried out in a fixed-bed microreactor. The reaction conditions are as follows: the loading amount of catalyst A is 1g, the reaction temperature is 425°C, the raw material is a mixture of dimethyl ether and catalytic cracking dry gas containing ethylene, the composition of the dry gas is shown in Table 3, and the feed ethylene / dimethyl ether ratio is 1.82, WHSV (dimethyl ether) = 1.66, and the reaction pressure is 0.1 MPa. The reaction product was analyzed by Varian CP-3800 gas chromatography, Plot column and hydrogen flame detector, and the sampling time was 21 minutes.

[0061] The reaction results are shown in Table 6. Under the above reaction conditions, the selectivity of propylene in the product is about 57%.

[0062] The reaction result of table 6 embodiment 3

[0063] Reaction temperature / ℃

[0064] *Other products include C 1 -C 3 Alkanes, etc.

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Abstract

The invention discloses a making method of propylene, which is characterized by the following: contacting raw material with ethylene and methylating agent and catalyst of molecular sieve with micropore aperture at 0. 3-0. 5nm under specific reacting condition; generating the product with propylene with selectivity over 65%.

Description

technical field [0001] The invention relates to a method for producing propylene by using gas containing ethylene as a raw material, in particular to a method for producing propylene by alkylation of ethylene. Background technique [0002] Propylene is an important petrochemical basic raw material. For a long time, the source of propylene has relied on ethylene cracking units and FCC (fluidized bed catalytic cracking) units. Since the growth rate of propylene continues to be higher than the growth rate of ethylene, the increase in propylene production on existing units is affected by raw material composition, unit processing capacity, unit transformation and Due to the limitation of operating costs, the development of a new process for increasing the production of propylene is an important direction to meet the growing demand for propylene. [0003] Studies have found that alkylation reactions between olefins and methanol can increase the carbon number of olefins (Svelle et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C2/58C07C2/60B01J29/06B01J29/83
CPCY02P20/52
Inventor 李金哲齐越刘中民许磊田鹏张大治魏迎旭
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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