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Purification technology with membrane separation strengthening function for hydrogen in high-hydrogen-content refinery gas through pressure swing adsorption

A technology of pressure swing adsorption and hydrogen refinery, which is applied in hydrogen separation, hydrogen/synthesis gas production, hydrogen separation using solid contact, etc. It can solve problems such as increased operation and maintenance costs of adsorption devices, difficulties in regeneration and desorption, and failure of adsorbents , to achieve the effect of reducing the cost of hydrogen separation and purification, improving regeneration and desorption conditions, and prolonging the service life

Active Publication Date: 2019-07-05
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PSA units often face two key bottlenecks when processing high-hydrogen refinery gas: 1) Refinery gas contains a lot of heavy hydrocarbon components with carbon five and above, and it is difficult to regenerate and desorb after being adsorbed , long-term accumulation will easily lead to the failure of the adsorbent, short service life, and significantly increase the operation and maintenance cost of the adsorption device; 2) PSA tail gas contains a large amount of hydrogen, and its content generally exceeds 50vol%, and even exceeds 65vol% when the performance of the adsorbent is attenuated
Due to the above reasons, the cost of separating and purifying hydrogen from high-hydrogen refinery gas by pressure swing adsorption is relatively high

Method used

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  • Purification technology with membrane separation strengthening function for hydrogen in high-hydrogen-content refinery gas through pressure swing adsorption
  • Purification technology with membrane separation strengthening function for hydrogen in high-hydrogen-content refinery gas through pressure swing adsorption
  • Purification technology with membrane separation strengthening function for hydrogen in high-hydrogen-content refinery gas through pressure swing adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 For the high-hydrogen-containing tail gas by-product of a 2.2 million-ton continuous catalytic reforming unit in a refining and chemical enterprise, the membrane separation-enhanced pressure swing adsorption process of the present invention is used to purify hydrogen. According to the composition and pressure, catalytic reforming high hydrogen content tail gas belongs to the second high hydrogen content refinery gas S-2.

[0027] Table 1 is a list of the composition and operating parameters of key materials in Example 1.

[0028]

[0029]

[0030] Such as figure 1As shown, the high-hydrogen-containing tail gas produced by the catalytic reforming unit passes through the first cooler 2, the first heat exchanger 3, and the second cooler 4 in sequence, and then enters the first liquid separation tank 5, and the second liquid is extracted at the bottom of the tank. A condensate S-5, the first non-condensable gas S-6 is produced at the top of the tank, and en...

Embodiment 2

[0033] Example 2 Aiming at the high-hydrogen-containing tail gas by-product of 600,000 tons of continuous catalytic reforming unit of a refining and chemical enterprise, and the low fraction gas and dry gas of 1.2 million tons of hydrocracking unit, the membrane separation intensified variant of the present invention is adopted. Hydrogen purification by pressure adsorption process. According to the composition and pressure, catalytic reforming high-hydrogen-containing tail gas belongs to the second high-hydrogen-containing refinery gas S-2, and the low fraction gas and dry gas of the hydrocracking unit belong to the first high-hydrogen-containing refinery gas S-1.

[0034] The composition of key material and operating parameter list in the embodiment 2 of table 2.

[0035]

[0036] Such as figure 1 As shown, the low fraction gas and dry gas of the hydrocracking unit are pressurized to 2.5MPaG by the first compressor 1, and then combined with the high hydrogen-containing ta...

Embodiment 3

[0039] Example 3 For the high-fraction gas, low-fraction gas and dry gas of a 2 million-ton diesel hydrocracking unit in a refining and chemical enterprise, the membrane separation-enhanced pressure swing adsorption process of the present invention is used to purify hydrogen. According to the composition and pressure, the diesel hydrocracking high-fraction gas belongs to the fourth highest hydrogen-containing refinery gas S-4, and the diesel hydrocracking low-fraction gas and dry gas belongs to the first high hydrogen-containing refinery gas S-1.

[0040] Table 3 is a list of composition and operating parameters of key materials in Example 3.

[0041]

[0042] Such as figure 1 As shown, the low fraction gas and dry gas of the hydrocracking unit are pressurized to 2.5MPaG by the first compressor 1, then pass through the first cooler 2, the first heat exchanger 3, and the second cooler 4, and then enter The first liquid separation tank 5 produces the first condensate S-5 at ...

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Abstract

The invention provides a purification technology with a membrane separation strengthening function for hydrogen in high-hydrogen-content refinery gas through pressure swing adsorption, and belongs tothe field of petrochemical industry. According to the technology, an organic vapor membrane separation unit is added to a pre-treatment system of a pressure swing adsorption device, heavy hydrocarboncomponents of carbon 5 or above are efficiently and deeply removed, and the content of the heavy hydrocarbon components is reduced to 0.3 vol% or below; the regeneration conditions of an adsorption agent are improved, the service life of the adsorption agent is prolonged, and the long-term operation stability of the pressure swing adsorption device is improved; a hydrogen membrane separation unitis added to an after-treatment system, organic vapor membrane permeation gas is further recovered, and low-concentration hydrogen in tail gas is subjected to pressure swing adsorption, so that the content of hydrogen in fuel gas is lower than 15 vol%, and the total hydrogen yield exceeds 95%. By prolonging the service life of the adsorption agent and increasing the hydrogen recovery rate, by meansof the purification technology with the membrane separation strengthening function for the hydrogen in the high-hydrogen-content refinery gas through pressure swing adsorption, compared with a traditional adsorption technology, the hydrogen separation and purification cost of the technology can be reduced by 10-20%.

Description

technical field [0001] The invention relates to a membrane separation-strengthened high-hydrogen-containing (more than 75 vol%) refinery gas pressure swing adsorption hydrogen purification process, which belongs to the field of petrochemical industry. This process introduces an organic vapor membrane separation unit into the pretreatment system of the pressure swing adsorption device, which can efficiently and deeply remove the heavy components of carbon five and above hydrocarbons, improve the regeneration conditions of the adsorbent, prolong the service life of the adsorbent, and improve the long-term operation of the adsorption device Stability: A hydrogen membrane separation unit is introduced into the post-treatment system to further recover low-concentration hydrogen in organic vapor membrane permeate gas and pressure swing adsorption tail gas. By prolonging the service life of the adsorbent and improving the hydrogen recovery rate, the membrane separation-enhanced high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/56
CPCC01B3/56C01B2203/042
Inventor 阮雪华贺高红代岩肖武姜晓滨焉晓明郭明钢
Owner DALIAN UNIV OF TECH
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