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Hydrogen purifying method and device for refinery dry gas after recovery of light olefins with high yield and high purity

A refinery dry gas, high yield technology, applied in the direction of hydrogen separation, using solid contact hydrogen separation, etc., can solve the problems of low recovery purity, low recovery rate, poor economic benefits, etc.

Active Publication Date: 2014-09-10
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the technical defects of low recovery rate or low recovery purity and poor economic benefits in the prior art, the present invention discloses a high-yield and high-purity hydrogen extraction method and device in refinery dry gas after recovery of light olefins. Post refinery dry gas for hydrogen recovery

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  • Hydrogen purifying method and device for refinery dry gas after recovery of light olefins with high yield and high purity
  • Hydrogen purifying method and device for refinery dry gas after recovery of light olefins with high yield and high purity

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Embodiment 1

[0041] Example 1. The raw material gas contains 40% hydrogen, 50% methane, 10% nitrogen and other gases, the pressure is 1.5 MPa, the temperature is 30 degrees Celsius, and the temperature is 10,000Nm. 3 / h traffic is sent as figure 2 In the device shown, the feed gas is pressurized to 3 MPa through the first pressurizing device, and then enters the first membrane separation device, wherein the first membrane separation device adopts a polyamide membrane module, and the first pressure swing adsorption tower is filled with activated carbon. and alumina and other adsorbents, the second pressure swing adsorption tower is mainly filled with molecular sieve adsorbents for refining hydrogen, the second membrane separation device uses polycarbonate membrane components, and the second pressure swing device is used for the second pressure swing. The desorption gas of the adsorption tower is pressurized to 2 MPa;

[0042] The measurement shows that the recovery rate of hydrogen is 99%...

Embodiment 2

[0043] Example 2. The raw material gas contains 60% hydrogen, 25% methane, 15% nitrogen and other gases, the pressure is 2.5 MPa, the temperature is 30 degrees Celsius, and the temperature is 10,000Nm 3 / h traffic is sent as figure 2 In the device shown, the raw gas directly enters the first membrane separation device, wherein the first membrane separation device adopts a polyamide membrane module, the first pressure swing adsorption tower is filled with adsorbents such as activated carbon and alumina, and the second pressure swing adsorption tower is mainly filled with adsorbents such as activated carbon and alumina. The pressure adsorption tower is mainly filled with molecular sieve adsorbent for refining hydrogen, the second membrane separation device adopts polycarbonate membrane module, and the second pressure device pressurizes the desorption gas of the second pressure swing adsorption tower to 1.2 MPa ;

[0044] The measurement shows that the recovery rate of hydrogen...

Embodiment 3

[0045] Example 3. The raw material gas contains 75% hydrogen, 20% methane, 5% nitrogen and other gases, the pressure is 1 MPa, the temperature is 25 degrees Celsius, and the temperature is 10,000Nm. 3 / h traffic is sent as figure 2 In the device shown, the feed gas is pressurized to 3 MPa through the first pressurizing device, and then enters the first membrane separation device, wherein the first membrane separation device adopts a polyamide membrane module, and the first pressure swing adsorption tower is filled with activated carbon. and alumina and other adsorbents, the second pressure swing adsorption tower is mainly filled with molecular sieve adsorbents for refining hydrogen, the second membrane separation device uses polycarbonate membrane components, and the second pressure swing device is used for the second pressure swing. The desorption gas of the adsorption tower is pressurized to 1 MPa;

[0046] The measurement shows that the recovery rate of hydrogen is 99%, a...

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Abstract

The invention relates to a hydrogen purifying method for refinery dry gas after recovery of light olefins with high yield and high purity. The method comprises the following steps: S1, first section membrane separation; S2, primary pressure swing adsorption; S3, second pressure swing adsorption; S4, second section membrane separation. The invention further relates to a hydrogen purifying device for refinery dry gas after recovery of light olefins with high yield and high purity. The device comprises a first membrane separating device, a second membrane separating device, a first pressure swing adsorption tower, a second pressure swing adsorption tower and first and second pressurizing devices. According to the hydrogen purifying method and device for refinery dry gas after recovery of light olefins with high yield and high purity provided by the invention, by adopting a technology combining pressure swing adsorption and membrane separation, the deficiencies on purity and low recovery rate of the two processes are remedied, so that hydrogen in the refinery dry gas after recovery of light olefins is recovered with high yield and purity, and the residual gas after hydrogen recovery can directly enter a burning gas pipe network to combust.

Description

technical field [0001] The invention belongs to the field of chemical separation and chemical machinery, and relates to a method and device for extracting hydrogen with high yield and high purity from refinery dry gas after recovering light olefins. Background technique [0002] The useful components in refinery dry gas are mainly hydrogen, light olefins and light alkanes. These components are very valuable in the refinery, but at present, a large amount of them have not been optimally utilized, but are directly used as fuel, and some are even directly ignited to vent. For the catalytic cracking dry gas, which accounts for the largest amount in the refinery dry gas, it contains not only hydrogen, but also a large amount of light olefins and light alkanes. These components can be separated and used separately, which is more beneficial than using them directly as fuel or raw materials for reforming hydrogen production and synthesizing methanol. [0003] There are currently m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50C01B3/56
Inventor 蔡跃明钟雨明陈运
Owner SICHUAN TECHAIRS