A method for converting olefins with four to six carbon atoms to produce propylene

A carbon atom and olefin technology, applied in ethylene production, bulk chemical production, organic chemistry, etc., can solve problems such as large solvent ratio, large reflux ratio, and large number of trays, so as to improve selectivity and yield, improve The effect of device capacity and energy saving

Inactive Publication Date: 2016-08-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the method of ordinary rectification is used to process C4, since the boiling points of the components of butene and butane in C4 are similar, the separation of ordinary rectification methods has a large reflux ratio, a large number of trays, high energy consumption, and poor operation. The problem of high investment costs
When extractive distillation technology is used, there are problems such as low yield of butene; complicated process and difficult operation; extraction agent is mixed in the separated product butene; large solvent ratio and large amount of extraction agent are used.

Method used

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  • A method for converting olefins with four to six carbon atoms to produce propylene
  • A method for converting olefins with four to six carbon atoms to produce propylene

Examples

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Effect test

Embodiment 1

[0044] The fixed-bed catalytic reactor ( figure 1 Middle module 4), heated to 120°C. The mixture (stream 11) of water (stream 12) and containing butane and butene-1 (50% by mass percentage) is at a water / ene molar ratio of 1:1, and the mass space velocity is 3h -1 , into the hydration reactor ( figure 1 Middle module 4), contact with the catalyst to carry out hydration reaction, the temperature is 120° C., the outlet of the hydration reactor obtains a mixture of hydrated sec-butanol and butane (stream 13). The liquid product obtained at the outlet of the hydration reactor is subjected to rectification separation (module 5), unreacted butane (stream 14) is obtained at the top of the tower, and sec-butanol (stream 15) is obtained at the bottom of the tower, wherein the alkane content is lower than 3%. , Compared with 50% alkane content in the raw material before hydration, it is greatly reduced. This stream (stream 15) is introduced into a fixed bed reactor (module 1) equippe...

Embodiment 2

[0048] The fixed-bed catalytic reactor ( figure 1 Middle module 4), heated to 120°C. Methanol (stream 12) and the mixture (stream 11) containing butane and butene-1 (50% by weight) are in alcohol / ene molar ratio of 1:1, and the mass space velocity is 3h -1 , into the synthesis reactor ( figure 1 The middle module 4) is contacted with the catalyst to carry out the addition reaction, the temperature is 120°C, and the mixture of methyl sec-butyl ether and butane (stream 13) obtained by the addition reaction is obtained at the outlet of the reactor. The liquid product obtained by the reactor outlet is subjected to rectification separation (module 5), unreacted butane (stream 14) is obtained at the top of the tower, and methyl sec-butyl ether (stream 15) is obtained at the bottom of the tower, wherein the alkane content is lower than 3%, compared with 50% alkane content in the raw material before hydration, it is greatly reduced. This stream (stream 15) is introduced into a fixe...

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PUM

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Abstract

The invention relates to a method for transforming and producing propylene by employing olefin with 4-6 carbon atoms, and provides a technique for transforming and producing propylene by employing C4 to C6 olefin components contained in liquefied gas and light petrol. According to the method, the olefin oligomerization cracking reaction process is changed by transforming the olefin into corresponding alcohol or ether; generation of low-valent by-products such as dry gas and coke in the reaction process is inhibited; the target product selectivity is improved; the material circulation in the process is reduced; and the energy consumption in the process is reduced.

Description

technical field [0001] The present invention relates to a process for the conversion of olefins having four to six carbon atoms to produce propylene, in particular a process for the at least partial conversion of a hydrocarbon feed comprising olefins having a carbon number between 4 and 6 to propylene , the fraction that will be referred to as the C4 / C6 fraction in the rest of the text most often comes from an FCC (Fluid Catalytic Cracking) unit or a steam cracking unit. Background technique [0002] Propylene is an important petrochemical raw material. With the continuous development of new varieties of downstream derivatives of propylene, the demand for propylene has been strong in recent years. At present, 54% of propylene in my country comes from steam cracking of naphtha, and 42% of propylene is a by-product of catalytic cracking unit. It is of great practical significance to develop new propylene production technology and further expand the source of propylene. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C1/20C07C11/04
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 赵辉杨朝合山红红马安田亮
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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