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Method for producing propylene

A production method and technology of propylene, applied in the field of propylene production, can solve the problems of high propylene selectivity, long catalyst regeneration period, high olefin conversion rate, etc.

Active Publication Date: 2007-12-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is that in the process of producing propylene in the prior art, the catalyst cannot simultaneously maintain the operation under the condition of high space velocity, high olefin conversion rate, high propylene selectivity and long catalyst regeneration period. Production method of propylene

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The raw materials used in the present invention include mixed C4, C5 and catalytic gasoline of FCC unit, and etherified C4 of ethylene unit. Table 1 is the composition of FCC mixed carbon four and ethylene etherified carbon four; Table 2 is the composition of FCC mixed carbon five; Table 3 is the composition of FCC gasoline.

[0022] Table 1 Mixed carbon four raw material composition

[0023] Component

Content (weight%)

FCC carbon four

Ethylene carbon four

propane

Propylene

Isobutane

8.8

3.50

n-butane

22.58

8.19

propyne

-

0.17

trans-2-butene

25.06

19.98

1-butene

11.22

53.33

Isobutylene

12.29

3.39

cis-2-butene

19.55

10.65

C 4 above

0.51

0.79

[0024] Table 2 Composition of FCC mixed carbon five raw materials

[0025] Componen...

Embodiment 2

[0034] Catalyst B is adopted, and the etherification mixed carbon four from the ethylene plant is used as raw material (see Table 1 for the specific composition), at a reaction temperature of 550° C., mixed C 4 The weight airspeed is 20 hours -1 , under the condition of reaction pressure 0.15MPa (absolute pressure), carry out olefin cracking reaction, the results are shown in Table 4.

[0035] Table 4 Ethylene C4 reaction results T = 550 ° C, WHSV = 20 hours -1

[0036] Response time (hours)

Embodiment 3

[0038] Catalyst C is adopted, and mixed carbon five from the FCC unit is used as raw material (see Table 2 for the specific composition), at a reaction temperature of 500°C, mixed C 4 The weight airspeed is 30 hours -1 , under the condition of reaction pressure 0.3Mpa (absolute pressure), carry out olefin cracking reaction, the results are shown in Table 5.

[0039] Table 5 Cracking Performance Reaction Results of FCC Mixed C5 Feedstock T=500°C, WHSV=30 hours -1

[0040] Response time (hours)

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Abstract

This invention relates to a method for producing propylene. The previous methods cannot satisfy high reaction space velocity, high hydrocarbon conversion rate, high propylene selectivity and long catalyst regeneration cycle at the same time. The method in this invention utilizes C4 or higher olefins as the raw materials, and contacts olefin raw materials and MFI zeolite catalyst (SiO2 / Al2O3 mol. ratio lower than 360) to produce propylene-containing effluent. The yield of propylene is 30-50 wt.% of olefin raw materials. The method can be used in industrial production of propylene from C4 or higher olefins.

Description

technical field [0001] The present invention relates to a production method of propylene. Background technique [0002] Demand for propylene was strong, driven by rising demand for polypropylene and alkylaromatic compounds. At present, about 98% of the world's propylene production is produced as a by-product of steam cracking and catalytic cracking units. However, the propylene / ethylene ratio of steam cracking units is about 0.6, and the investment cost is very high. Upgrading the FCC unit is a means, but the technology has a low propylene yield, and increasing the propylene yield has been proven to be expensive and limited, and this technology cannot be integrated with the ethylene unit, let alone deal with the by-products of the FCC unit or the ethylene unit. Product C 4 and C 4 + Olefins; Propane dehydrogenation Due to raw material sources and cost reasons, the production of propylene is limited. The process route of olefin disproportionation technology is long, the ...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C4/06
CPCY02P20/52Y02P20/584
Inventor 滕加伟谢在库赵国良金文清刘俊涛
Owner CHINA PETROLEUM & CHEM CORP
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