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Variable pressure absorption method for increasing absorption phase product yield

A technology of pressure swing adsorption and adsorption phase, which is applied in the field of pressure swing adsorption to achieve the effect of improving the recovery rate

Active Publication Date: 2013-02-20
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The replacement process improves the purity of the adsorption phase product, and also increases the partial pressure of the adsorption phase product at the outlet end of the adsorber. Due to the evacuation efficiency of the vacuum pump and the influence of the adsorption mass transfer resistance of the adsorption phase product on the adsorbent, in the pressure swing adsorption In the decompression desorption stage of the separation process, there will be a part of the adsorption phase product that has not been completely desorbed in the outlet section of the adsorber. This part of the product will be taken out of the adsorber by the adsorption waste gas in the next adsorption process, resulting in the recovery of the adsorption phase product. The reduction of the rate affects the economic benefits of the pressure swing adsorption unit
Patent ZL200510129369.3 and patent ZL200510118241.7 of Sichuan Tianyi Science and Technology Co., Ltd. disclose the method of recovering and replacing the adsorption phase products in waste gas by two-stage pressure swing adsorption, which solves the problem of reducing the recovery rate of adsorption phase products by replacing waste gas, but does not It can be involved in solving the problem of reducing the recovery rate of adsorption phase products by bringing out adsorption phase products in the adsorption waste gas

Method used

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  • Variable pressure absorption method for increasing absorption phase product yield

Examples

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Embodiment 1

[0053] This example is a pressure swing adsorption method for separating and recovering ethylene from catalytic cracking dry gas in an oil refinery, with a dry gas flow rate of 30,000 Nm 3 / h, its gas composition is shown in Table 1:

[0054] Table 1 Dry gas composition V%

[0055]

[0056] The PSA system in this embodiment is composed of PSA 1 stage PSA-1, PSA 2 stage PSA-2 and PSA 3 stage PSA-3. The feed gas enters the first stage of PSA, and the replacement exhaust gas of the first stage of PSA enters the second stage of PSA as the raw material gas of the second stage of PSA. Ethylene-rich product and displacement gas are obtained by pumping air, and the adsorption waste gas from PSA 1 and PSA 2 enters PSA 3 as raw material gas for PSA 3, reverse discharge and pumping in PSA 3 After the air is pressurized, it returns to the first stage of PSA and mixes with the raw material gas as the raw material gas for PSA, and the adsorption exhaust gas output device of the third s...

Embodiment 2

[0130] This embodiment is a pressure swing adsorption method for separating and recovering carbon dioxide from the converted gas of synthetic ammonia, and the flow rate of the mixed gas is about 15000Nm 3 / h, the adsorption pressure is about 0.75Mpa, and the temperature is about 30°C. The composition of the mixed gas to be processed is shown in Table 1:

[0131] Table 1 Composition of feed gas

[0132] .

[0133] The PSA system in this embodiment is composed of PSA 1 stage PSA-1, PSA 2 stage PSA-2 and PSA 3 stage PSA-3. The feed gas enters the first stage of PSA, and the replacement exhaust gas of the first stage of PSA enters the second stage of PSA as the raw material gas of the second stage of PSA. Air is pumped to obtain carbon dioxide product and replacement gas. The waste gas from PSA 1 and PSA 2 enters PSA 3 as raw material gas for PSA 3, reverse release and pumping air in PSA 3. After pressurization, return to PSA stage 1 to mix with raw material gas as raw materi...

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Abstract

The present invention discloses a variable pressure absorption method for increasing absorption phase product yield, wherein a variable pressure absorption system comprises a variable pressure absorption segment 1, a variable pressure absorption segment 2 and a variable pressure absorption segment 3, every variable pressure absorption segment respectively comprises at least two absorption towers filled with an absorption agent, every absorption tower of the variable pressure absorption segment 1 and the variable pressure absorption segment 2 is at least sequentially and circularly subjected to steps of absorption, displacement, evacuation and pressure increasing, displaced waste gas from the variable pressure absorption segment 1 and the variable pressure absorption segment 2 is adopted as raw material gas and enters the variable pressure absorption segment 2, every absorption tower of the variable pressure absorption segment 3 is at least sequentially and circularly subjected to steps of absorption, reverse releasing or evacuation, and pressure increasing, absorbed waste gas from the variable pressure absorption segment 1 and the variable pressure absorption segment 2 is adopted as raw material gas of the variable pressure absorption segment 3 and enters the variable pressure absorption segment 3, and reverse releasing gas or evacuation gas of the variable pressure absorption segment 3 returns to the variable pressure absorption segment 1, and is adopted as raw material gas of the variable pressure absorption segment 1.

Description

technical field [0001] The invention relates to a pressure swing adsorption (PSA) method for separating and recovering adsorption phase products from mixed gas, in particular to a pressure swing adsorption method including a replacement step in the process of separating and recovering adsorption phase products. Background technique [0002] The pressure swing adsorption method is to use the porous solid adsorbent to selectively adsorb different components in the mixed gas under a certain pressure to realize the separation of the mixed gas. According to the adsorption or non-adsorption state of the product to be separated in the adsorption bed, it can be divided into adsorption phase products and non-adsorption phase products. The existing separation and recovery of carbon dioxide in ammonia conversion gas, separation and recovery of carbon monoxide from water gas and semi-water gas after carbon dioxide removal, and separation and recovery of hydrocarbon components in mixed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047
Inventor 郜豫川张剑锋杨云刘丽
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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