CN102172463A - Pressure swing adsorption method comprising pump-out and replacement steps - Google Patents
Pressure swing adsorption method comprising pump-out and replacement steps Download PDFInfo
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- CN102172463A CN102172463A CN2011100463495A CN201110046349A CN102172463A CN 102172463 A CN102172463 A CN 102172463A CN 2011100463495 A CN2011100463495 A CN 2011100463495A CN 201110046349 A CN201110046349 A CN 201110046349A CN 102172463 A CN102172463 A CN 102172463A
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Abstract
The invention discloses a pressure swing adsorption method comprising pump-out and replacement steps. The method comprises the following steps of: adsorbing; performing pressure equalizing; performing forward discharging; performing inverse discharging; and pumping out. In the pump-out step, a replacement step is added; the pressure of a system is kept in the range of 0.01MPa below zero to 0.08MPa below zero; and replacing gas under the pressure of 0.05MPa to 0.8MPa is introduced to carry out pump-out and replacement. The pressure swing adsorption method is low in investment and energy consumption, and an adsorbent has a good deabsorption effect. By the method, the problem of removing a trace amount of impurities is solved, and product gas with high purity can be obtained.
Description
Technical field
The present invention relates to a kind of pressure swing absorption process, particularly a kind of pressure swing absorption process that contains the displacement step of finding time.
Background technology
Transformation absorption (PSA) provides the technology of industrial needs for the separation and at least a product component of purifying from material mixed gas.At least comprise a kind of component of adsorbing selected in the unstripped gas, under adsorptive pressure, unstripped gas enters into the adsorbent bed of selective absorption from the adsorption tower bottom, and easily adsorbent component is adsorbed and rests on bed, difficult adsorbent component then from the output of the bed port of export, has realized the separation of mist.In general, the basic step of transformation absorption comprises the absorption and two steps of regenerating, and the quality of adsorption step is determined by the performance of adsorbent substantially, and the optimization of regeneration step becomes the improved key of pressure swing adsorption technique.
At present, in pressure-swing absorption process, regeneration step mainly contains step-down, washes and finds time.Below simple these the three kinds of regeneration step down of introducing.
(1) step-down: adsorbent bed is finished adsorption process under certain pressure after,, make to be adsorbed component and to desorb by step-down mode (reducing near atmospheric pressure usually).Adopt nature step-down mode, underpressure is limited, is adsorbed fully desorb of component, and adsorbent reactivation is incomplete.
(2) flushing: utilize pure product gas or other suitable gas bleed adsorbent bed, make it abundant desorb to reduce to be adsorbed the dividing potential drop of component, thereby reach the purpose of adsorbent reactivation.Adopt the regeneration of flushing, do not need to increase power-equipment, energy consumption is low, desorb is more thorough relatively, but its shortcoming is also apparent in view, and maximum shortcoming is exactly in order to reach adsorbent reactivation purpose completely, usually need a large amount of purge gas, the flushing waste gas after the flushing can't be handled.If particularly do not have a large amount of suitable flushing gas, and utilize pure product gas as purge gas, will reduce the rate of recovery of product gas so greatly, that is to say the purity that guarantees product gas by the rate of recovery of sacrificing product gas.
(3) vacuumize: after adsorbent bed dropped to atmospheric pressure, in order further to reduce to be adsorbed the dividing potential drop of component, available method of finding time further reduced adsorbent bed pressure to vacuum state, made to be adsorbed the abundant desorb of component.The method that vacuumizes is at present comparatively commonly used, a regeneration effect method preferably.The purpose that vacuumizes regeneration is exactly further to reduce the dividing potential drop of the component that needs desorb, thoroughly will increase the power of vavuum pump in order to regenerate thus, and it is higher that the drawback of the method that vacuumizes thus is exactly its energy consumption.
Summary of the invention
The objective of the invention is to overcome in the prior art pressure swing absorption process investment and energy consumption height, not good deficiency or the high drawback of adsorbent desorb energy consumption of adsorbent desorption effect, a kind of pressure swing absorption process that contains the displacement step of finding time is provided.This pressure swing absorption process investment and energy consumption are low, and the adsorbent desorption effect is good, has solved the problem of deviating from of trace impurity, can obtain highly purified product gas.
For achieving the above object, the technical solution adopted for the present invention to solve the technical problems is:
A kind of pressure swing absorption process that contains the displacement step of finding time, comprise absorption, all press, along put, contrary putting and evacuation step, the displacement step of adding in the process of carrying out in evacuation step, keep system pressure to be-0.01MPa～-0.08 MPa, introducing pressure is that the displacement gas of 0.05MPa～0.8 MPa finds time to replace.
As optimal way, the adsorption capacity of described displacement gas is less than the easy absorbed component in the unstripped gas.
As optimal way, in the described pressure swing absorption process, have two of adsorption towers at least, transformation is adsorbed on the circulation of adsorption tower intercycle and carries out.
As optimal way, the time swap of described displacement gas is 10～600 seconds.
The present invention can realize being difficult for easily adsorbing deviating from of impurity composition in the adsorbed components, deviates from the precision height, can reach below the 0.5PPm.As: be used for as CO gas impurity CO
2Deviate from, deviate from precision and can reach below the 5PPm; Also can be used for H
2Middle trace impurity CO or CO
2Deviate from, deviating from precision can reach below the 0.5PPm.In pressure swing adsorption technique, expect highly purified product gas, whether the desorb of the impurity substances of absorption is key factor fully, if the impurity desorb is incomplete, so just can not obtain highly purified product gas.At this reason, we have invented the technological process of finding time to replace, both on the step of technology of finding time originally, increased a displacement step, adopt a spot of substitution gas to be incorporated in the evacuation step, so just realized under the lower pressure when finding time, introduce displacement gas, the introducing of this displacement gas will reduce the dividing potential drop of the easy absorbed component material that needs desorb significantly, and its complete desorb is got off.Owing to introduced displacement gas, the vacuum when vacuumizing there is no need to be extracted into very low vacuum, can reduce the configuration of vavuum pump, has saved energy consumption.Owing to be vacuum technology, we only need a spot of displacement gas of introducing just can desorb the component that is difficult to resolve suction fully, reach the purpose of regeneration.From above elaboration as can be seen, owing to adopted the technological process of finding time to replace, under less power-equipment configuration, seldom the condition of displacement gas, just fully the component that is difficult to resolve suction is desorbed, small investment, energy consumption is low, and regeneration effect is thorough.
Beneficial effect of the present invention is: investment of the present invention and energy consumption are low, and the adsorbent desorption effect is good, have solved the problem of deviating from of trace impurity, can obtain highly purified product gas.
The specific embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Embodiment 1: a kind of pressure swing absorption process that contains the displacement step of finding time, unstripped gas are rich CO gas (its composition see Table 1), require CO
2Impurity composition makes CO in the CO product gas
2Impurity content reaches 10PPm, may further comprise the steps:
A, absorption:
With the bottom feeding adsorption tower of unstripped gas from adsorption tower, the easy absorbed component CO in the unstripped gas
2Be attracted on the adsorbent, the CO product gas after the purification flows out from adsorption tower top, and is past out-of-bounds as the product pneumatic transmission, CO in the outlet purified gas of adsorption tower
2When content reaches 10PPm, stop the feeding of unstripped gas, adsorption step finishes;
B, drop pressure:
By the mode of all pressing the adsorption tower that stops to adsorb is carried out drop pressure 3 times, after the 3rd equalizing pressure balance, all press step to finish;
C, contrary putting:
To all pressing the adsorption tower finish to carry out further step-down, when contrary putting is depressurized to normal pressure or during near normal pressure, contrary rapid end that stride against the absorption direction;
D, find time one:
Utilize vavuum pump that the contrary adsorption tower of putting end is found time, when the adsorption column pressure of finding time drop to-during 0.06MPa, the step of finding time finishes;
E, the displacement of finding time:
Feed displacement gas nitrogen, nitrogen gas pressure is 0.1MPa, and the feeding amount of control nitrogen is kept-0.04MPa the adsorption column pressure of finding time, and time swap 20 seconds stops the feeding of nitrogen, and the displacement step of finding time finishes;
F, find time two:
Utilize vavuum pump that adsorption tower is continued to find time, when adsorption column pressure reach-during 0.08MPa, stop to find time, two steps of finding time finish, the highly purified CO product gas component that obtains sees Table 2.
Feed gas composition table among table 1 embodiment 1
| Component | H 2 | O 2、N 2、Ar | CO | CO 2 | CH 4 |
| Concentration (%) | ～0.03 | ～0.16 | ～80.0 | ～19.8 | ～0.01 |
Pressure: 0.7MPa.
CO product gas component table among table 2 embodiment 1
| Component | H 2 | O 2、N 2、Ar | CO | CO 2 | CH 4 |
| Concentration (%) | ～0.05 | ～1.02 | ～98.8 | 10ppm | ～0.02 |
As can be seen from Table 2, CO in the product gas
2Content be controlled at below the 10ppm, our displacement gas nitrogen increases to some extent accordingly.Nitrogen does not have harm as inert component in a lot of chemical industry is synthetic, can also play useful effect sometimes.
Embodiment 2: a kind of pressure swing absorption process that contains the displacement step of finding time, unstripped gas are high concentration CO gas (its composition see Table 3), refinement to deviate from CO
2Impurity composition makes the CO of CO product gas
2Impurity content reaches 5PPm, may further comprise the steps:
A, absorption:
With the bottom feeding adsorption tower of unstripped gas from adsorption tower, the easy absorbed component CO in the unstripped gas
2Be attracted on the adsorbent, the CO product gas after the purification flows out from adsorption tower top, and is past out-of-bounds as the product pneumatic transmission, CO in the outlet purified gas of adsorption tower
2When content reaches 5PPm, stop the feeding of unstripped gas, adsorption step finishes;
B, drop pressure:
By the mode of all pressing the adsorption tower that stops to adsorb is carried out drop pressure 4 times, after the 4th equalizing pressure balance, all press step to finish;
C, suitable putting:
To all pressing the adsorption tower finish to carry out further step-down, when being depressurized to normal pressure or during near normal pressure, along rapid end that stride along putting along the absorption direction;
D, find time one:
Utilize vavuum pump that the contrary adsorption tower of putting end is found time, when the adsorption column pressure of finding time drop to-during 0.04MPa, the step of finding time finishes;
E, the displacement of finding time:
Feed displacement gas hydrogen, the pressure of hydrogen is 0.2MPa, and the feeding amount of control hydrogen is kept-0.03MPa the adsorption column pressure of finding time, and time swap 90 seconds stops the feeding of hydrogen, and the displacement step of finding time finishes;
F, find time two:
Utilize vavuum pump that adsorption tower is continued to find time, when adsorption column pressure reach-during 0.07MPa, stop to find time, two steps of finding time finish, the highly purified CO product gas that obtains.
Feed gas composition table among table 3 embodiment 2
| Component | H 2 | O 2、N 2、Ar | CO | CO 2 | CH 4 |
| Concentration (%) | ～0.1 | ～0.06 | ～98.5 | ～1.3 | ～0.04 |
Pressure: 0.9MPa.
Embodiment 3: a kind of pressure swing absorption process that contains the displacement step of finding time, unstripped gas are high concentration hydrogen (its composition see Table 4), require N
2, CH
4, CO and CO
2Impurity composition makes H
2The impurity contents such as CO of product gas reach 5PPm, may further comprise the steps:
A, absorption:
With the bottom feeding adsorption tower of unstripped gas from adsorption tower, easy absorbed component in the unstripped gas is attracted on the adsorbent, CO product gas after the purification flows out from adsorption tower top, past out-of-bounds as the product pneumatic transmission, when CO content reaches 5PPm in the outlet purified gas of adsorption tower, stop the feeding of unstripped gas, adsorption step finishes;
B, drop pressure:
By the mode of all pressing the adsorption tower that stops to adsorb is carried out drop pressure 4 times, after the 4th equalizing pressure balance, all press step to finish;
C, suitable putting:
To all pressing the adsorption tower finish to carry out further step-down, when being depressurized to normal pressure or during near normal pressure, along rapid end that stride along putting along the absorption direction;
D, find time one:
Utilize vavuum pump that the contrary adsorption tower of putting end is found time, when the adsorption column pressure of finding time drop to-during 0.06MPa, the step of finding time finishes;
E, the displacement of finding time:
Feed displacement gas hydrogen, the pressure of hydrogen is 0.3MPa, and the feeding amount of control hydrogen is kept-0.05MPa the adsorption column pressure of finding time, and time swap 120 seconds stops the feeding of hydrogen, and the displacement step of finding time finishes;
F, find time two:
Utilize vavuum pump that adsorption tower is continued to find time, when adsorption column pressure reach-during 0.07MPa, stop to find time, two steps of finding time finish, the highly purified hydrogen product gas component that obtains sees Table 5.
Feed gas composition table among table 4 embodiment 3
| Component | H 2 | N 2、Ar | CO | CH 4 | CO 2 |
| Concentration (%) | ～87 | ～0.7 | ～11.5 | ～0.6 | ～0.2 |
Pressure: 0.9MPa.
Hydrogen product gas component table among table 5 embodiment 3
| Component | H 2 | N 2、Ar | CO |
| Concentration (%) | 99.99 | 0.01 | 0.5ppm |
As can be seen from Table 5, the purity of H2 can reach 99.99% in the product gas, and the content of CO is controlled at below the 5ppm.
The present invention is not limited to the aforesaid specific embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (4)
1. pressure swing absorption process that contains the displacement step of finding time, comprise absorption, all press, along put, contrary putting and evacuation step, it is characterized in that: in the displacement step of adding in the process of carrying out of evacuation step, keep system pressure be-0.01MPa～-0.08MPa, introduce pressure and be the displacement gas of 0.05MPa～0.8MPa and find time to replace.
2. a kind of pressure swing absorption process that contains the displacement step of finding time as claimed in claim 1 is characterized in that: the adsorption capacity of described displacement gas is less than the easy absorbed component in the unstripped gas.
3. a kind of pressure swing absorption process that contains the displacement step of finding time as claimed in claim 1 is characterized in that: in the described pressure swing absorption process, have two of adsorption towers at least, transformation is adsorbed on the circulation of adsorption tower intercycle and carries out.
4. a kind of pressure swing absorption process that contains the displacement step of finding time as claimed in claim 1 is characterized in that: the time swap of described displacement gas is 10～600 seconds.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553394A (en) * | 2012-02-02 | 2012-07-11 | 四川同盛科技有限责任公司 | Pressure swing adsorption technology for simultaneously purifying CO and CO2 from coke pure oxygen continuous gas preparation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1215624A (en) * | 1997-10-24 | 1999-05-05 | 化学工业部西南化工研究设计院 | Multi-bed vacuum pressure swing adsorption process for extracting hydrogen from hydrogen-contg. mixed gas |
| CN1349841A (en) * | 2000-10-19 | 2002-05-22 | 四川华泰投资有限责任公司 | Pressure swing absorption process of separating relieved gas from methanol synthesis to prepare high-purity hydrogen and CO2 |
| CN1597053A (en) * | 2004-08-27 | 2005-03-23 | 四川天一科技股份有限公司 | Pressure-varying adsorption method for recovering vinyl chloride and acetylene from gas mixture |
-
2011
- 2011-02-28 CN CN2011100463495A patent/CN102172463A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1215624A (en) * | 1997-10-24 | 1999-05-05 | 化学工业部西南化工研究设计院 | Multi-bed vacuum pressure swing adsorption process for extracting hydrogen from hydrogen-contg. mixed gas |
| CN1349841A (en) * | 2000-10-19 | 2002-05-22 | 四川华泰投资有限责任公司 | Pressure swing absorption process of separating relieved gas from methanol synthesis to prepare high-purity hydrogen and CO2 |
| CN1597053A (en) * | 2004-08-27 | 2005-03-23 | 四川天一科技股份有限公司 | Pressure-varying adsorption method for recovering vinyl chloride and acetylene from gas mixture |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553394A (en) * | 2012-02-02 | 2012-07-11 | 四川同盛科技有限责任公司 | Pressure swing adsorption technology for simultaneously purifying CO and CO2 from coke pure oxygen continuous gas preparation |
| CN102553394B (en) * | 2012-02-02 | 2014-03-26 | 四川同盛科技有限责任公司 | Pressure swing adsorption technology for simultaneously purifying CO and CO2 from coke pure oxygen continuous gas preparation |
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Application publication date: 20110907 |