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Separation method for propane dehydrogenation reaction gas

A propane dehydrogenation and separation method technology, which is applied in the purification/separation of hydrocarbons, chemical instruments and methods, hydrocarbons, etc., can solve the problems of poor separation effect and high energy consumption, and reduce investment and energy consumption. The effect of low consumption and simple operation

Active Publication Date: 2018-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a separation method for propane dehydrogenation reaction gas in order to overcome defects such as poor separation effect of propane dehydrogenation reaction gas and high energy consumption in the prior art

Method used

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  • Separation method for propane dehydrogenation reaction gas
  • Separation method for propane dehydrogenation reaction gas
  • Separation method for propane dehydrogenation reaction gas

Examples

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Embodiment 1

[0059] This embodiment is used to illustrate the separation method of the propane dehydrogenation reaction gas of the present invention.

[0060] (1) if figure 1 Said, the PDH gas from the outlet of the PDH reactor (see Table 1 below for its specific composition) is compressed to 2MPa through a compressor 1 with three compression sections, and then passed into the first cooler 2 to cool to 20°C;

[0061] (2) passing the cooled gas into the membrane separation system 3 and carrying out membrane separation at an operating pressure of 2 MPa to obtain permeate gas containing methane and hydrogen and non-permeate gas rich in hydrocarbons;

[0062] (3) Pass the above-mentioned hydrocarbon-rich non-permeate gas into the second cooler 4 to cool to 15° C., and pass the above-mentioned permeate gas containing methane and hydrogen into the pressure swing adsorption hydrogen production system 8 for pressure swing adsorption production. Hydrogen, wherein the conditions for producing hydro...

Embodiment 2

[0070] This embodiment is used to illustrate the separation method of the propane dehydrogenation reaction gas of the present invention.

[0071] (1) if figure 1 As stated, the PDH gas from the outlet of the PDH reactor (see Table 2 below for its specific composition) is compressed to 3.0 MPa by a compressor 1 with three compression sections, and then passed into the first cooler 2 to cool to 30°C;

[0072] (2) Pass the cooled gas into the membrane separation system 3 and carry out membrane separation at an operating pressure of 3.0 MPa to obtain permeate gas containing methane and hydrogen and non-permeate gas rich in hydrocarbons;

[0073] (3) Pass the above-mentioned hydrocarbon-rich non-permeate gas into the second cooler 4 to cool to 13° C., and pass the above-mentioned permeate gas containing methane and hydrogen into the pressure swing adsorption hydrogen production system 8 for pressure swing adsorption production. Hydrogen, wherein the conditions for producing hydrog...

Embodiment 3

[0082] This embodiment is used to illustrate the separation method of the propane dehydrogenation reaction gas of the present invention.

[0083] (1) if figure 1 Said, the PDH gas from the outlet of the PDH reactor (see Table 3 below for its specific composition) is compressed to 2MPa by a compressor 1 with three compression sections, and then passed into the first cooler 2 to cool to 15°C;

[0084] (2) passing the cooled gas into the membrane separation system 3 and performing membrane separation at an operating pressure of 1.5 MPa to obtain permeate gas containing methane and hydrogen and non-permeate gas rich in hydrocarbons;

[0085] (3) Pass the above-mentioned hydrocarbon-rich non-permeate gas into the second cooler 4 to cool to 15° C., and pass the above-mentioned permeate gas containing methane and hydrogen into the pressure swing adsorption hydrogen production system 8 for pressure swing adsorption production. Hydrogen, wherein the conditions for producing hydrogen b...

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Abstract

The invention relates to the field of separation of propane dehydrogenation reaction gas, and discloses a separation method for propane dehydrogenation reaction gas. The separation method comprises the following steps: (1) cooling the propane dehydrogenation reaction gas; (2) subjecting the cooled gas to membrane separation so as to obtain methane and hydrogen containing permeable gas and hydrocarbon-rich impermeable gas; (3) cooling the hydrocarbon-rich impermeable gas; (4) allowing an absorbent containing a carbon-4 component or a carbon-5 component to contact with the cooled hydrocarbon-rich impermeable gas in an absorption tower, and allowing the absorbent to absorb a carbon-3 component and / or heavier components in the hydrocarbon-rich impermeable gas; (5) allowing the carbon-3 component and / or heavier component absorbed absorbent to be desorbed in a desorption tower so as to obtain carbon-3 component gas and tower bottoms; and (6) subjecting the carbon-3 component gas obtained inthe step (5) to propylene rectification in a propylene rectification tower so as to obtain propylene and propane. The method provided by the invention has low energy consumption and can obtain high-purity hydrogen and propylene.

Description

technical field [0001] The invention relates to the field of propane dehydrogenation reaction gas separation, in particular to a separation method of propane dehydrogenation reaction gas. Background technique [0002] Propylene is an important petrochemical basic raw material, mainly used in the production of dozens of petrochemical products and raw materials such as polypropylene, propylene oxide, acrylic acid, acrylonitrile, alkylated oil, and high-octane blending materials. Due to the rapid development of propylene downstream products, the rapid growth of my country's propylene demand has been greatly promoted. Since 2000, the growth rate of propylene demand has exceeded that of ethylene. [0003] The supply of propylene mainly comes from the catalytic cracking process of naphtha steam cracking to ethylene and petroleum refining, but the existing traditional devices can no longer meet the market demand. Under the huge gap of propylene, the technology of producing propyl...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C9/08C07C7/00
CPCC07C7/005C07C11/06C07C9/08
Inventor 胡志彦李东风刘智信邹弋李春芳
Owner CHINA PETROLEUM & CHEM CORP
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