Pressure swing adsorption method for distilling olefin or ethane from gas mixture

A technology of pressure swing adsorption and mixed gas, applied in the direction of absorption purification/separation, organic chemistry, etc., can solve the problems such as difficult to purify olefins, and achieve the effect of improving purity, enhancing separation effect and strong selectivity

Inactive Publication Date: 2005-03-30
伍仁兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing pressure swing adsorption process is operated at normal temperature, and the adsorbent has a strong adsorption capacity for olefins and alkanes at room temperature, so it is difficult to achieve the purpose of purifying olefins from the mixture containing olefins and alkanes

Method used

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  • Pressure swing adsorption method for distilling olefin or ethane from gas mixture
  • Pressure swing adsorption method for distilling olefin or ethane from gas mixture
  • Pressure swing adsorption method for distilling olefin or ethane from gas mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The raw material gas is catalytic dry gas, and its composition is as follows:

[0038] Components: CH 4 C 2 h 4 C 2 h 6 C 3 h 8 C 3 h 6

[0039] Volume % (V): 37 18 18 0.4 2

[0040] Components: Isobutene n-Butene Butene C5

[0041] Volume % (V): 0.6 0.3 1.3 0.2

[0042] Component: H2 CO 2 CO and the rest are N 2

[0043] Volume % (V): 20 1.1 0.1

[0044] According to the composition of the above-mentioned raw materials, the PSA method in this embodiment adopts the PSA process flow as shown in Figure 1 and the process sequence table shown in Figure 3 .

[0045] The pressure swing adsorption system of this embodiment has four tower-type adsorption beds E, F, G, H, and raw gas pipeline G1, inlet pipe G7, replacement gas inlet pipe G12, replacement gas outlet pipe G9, pressure equalization Pipes G10 and G11, waste gas discharge pipe G8, vacuum pipe G13, E1 is the feed gas heater, C2 is the replacement exhaust gas pressurizer, C3 is th...

Embodiment 2

[0071] The feed gas of this embodiment is the same as that of Embodiment 1, and the extracted product is pure ethylene.

[0072] In this embodiment, two stages of pressure swing adsorption are operated in series. The first stage is a pretreatment device, which is used to remove propylene and olefins with a molecular weight greater than propylene, and also to remove propylene and alkanes above propane. The ethylene-containing mixed gas from which propylene, propane and above hydrocarbons have been removed enters the second stage of pressure swing adsorption to purify ethylene.

[0073] The process flow chart of the pressure swing adsorption pretreatment device in this embodiment is shown in Figure 2, and the process flow chart 1 of the pressure swing adsorption device for extracting ethylene. The ethylene-containing mixed gas from which propylene and other components have been removed by the pretreatment device enters the ethylene extraction pressure swing adsorption device thr...

Embodiment 3

[0101]The raw material gas in this example is the same as that in Example 1, and the olefins are extracted by adopting a process of serial replacement steps consisting of two adsorption bed replacement steps connected in series. The process flow of this embodiment is shown in Figure 6, and the process sequence is shown in Figure 5. The adsorption towers I~L are filled with Cu + the adsorbent. Now take Tower I as an example to illustrate this embodiment.

[0102] 1. Adsorption (A)

[0103] The raw material pressure is 0.1-0.2Mpa, enters the heater E2 through V4 and heats up to 130°C, and enters the adsorption tower I through the pipeline G19 and the program-controlled valve 1I. 2I discharges non-adsorbed gas. When the adsorption front of olefins reaches a certain position in the tower, close 1I and 2I.

[0104] 2. Equal pressure drop (ED)

[0105] Open the program-controlled valve 6I, press all the gas in the adsorption bed I into the J tower to increase the pressure of th...

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Abstract

A process for extracting olefin or ethylene from gas mixture by variable-pressure adsorption method features that its adsorption system contains at least two adsorption beds, and includes such steps as adsorbing at 50-300 deg.C, displacing, vacuumizing and raising pressure. The adsorbent in adsorption tower is chosen from silica gel, alumina, activated carbon, molecular sieve, resin, carbon adsorbent and zeolite molecular sieve, etc.

Description

Technical field: [0001] The invention relates to a pressure swing adsorption method for separating and purifying gas from a gas mixture, especially a pressure swing adsorption method for separating and purifying olefin or ethylene from a mixed gas containing olefin and alkane. technical background: [0002] Pressure swing adsorption is a technology for separating and purifying gas from a gas mixture. It is usually a gas phase adsorption process at room temperature. Under high pressure (adsorption pressure), the adsorption capacity of gas components is large, but under low pressure (desorption pressure), the adsorption capacity is small. The alternating switching cycle process consisting of adsorption and desorption is used to realize the separation of gases. The existing pressure swing adsorption process is operated at normal temperature, and the adsorbent has a strong adsorption capacity for olefins and alkanes at room temperature, so it is difficult to achieve the purpose ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/11C07C11/02C07C11/04
Inventor 伍仁兴
Owner 伍仁兴
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