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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front Chem Sci Eng    2013, Vol. 7 Issue (4) : 472-481    https://doi.org/10.1007/s11705-013-1351-4
RESEARCH ARTICLE
Enrichment of CO from syngas with Cu(I)Y adsorbent by five-bed VPSA
Shuna LI, Huawei YANG, Donghui ZHANG()
Chemical Engineering Research Center, State key laboratory of chemical engineering, Tianjin University, Tianjin 300072, China
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Abstract

Cu(I)Y adsorbent was prepared by reduction of Cu(II)Y which was prepared by ion exchange between the NaY zeolite and a solution of Cu(II) chloride. The dynamic adsorption capacity of Cu(I)Y for CO was calculated by adsorption breakthrough curve measured on a fixed bed at 30°C and 0.006 MPa (g) of CO partial pressure. The calculated CO adsorption capacity was 2.14 mmol/g, 37.5 times as much as that of NaY zeolite. The adsorption breakthrough curve experiment was also simulated with Aspen Adsorption software and the results were approximately consistent with experimental results. Then a five-bed VPSA process for separating CO from syngas on this adsorbent was dynamically simulated with Aspen Adsorption software with the adsorption pressure of 0.68 MPa (g) and the desorption pressure of -0.075 MPa (g). The results showed that CO was enriched from 32.3% to 95.16%–98.12%, and its recovery was 88.47%–99.44%.

Keywords Cu(I)Y adsorbent      breakthrough curve      desorption      VPSA      simulation     
Corresponding Author(s): ZHANG Donghui,Email:donghuizhang@tju.edu.cn   
Issue Date: 05 December 2013
 Cite this article:   
Shuna LI,Huawei YANG,Donghui ZHANG. Enrichment of CO from syngas with Cu(I)Y adsorbent by five-bed VPSA[J]. Front Chem Sci Eng, 2013, 7(4): 472-481.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-013-1351-4
https://academic.hep.com.cn/fcse/EN/Y2013/V7/I4/472
Fig.1  The flow chart of five-column simulation
60s180s60s180s60s180s60s180s60s180s
Bed1ADADEDRPRPBDVCVCEPP
Bed2EPPADADEDRPRPBDVCVC
Bed3VCVCEPPADADEDRPRPBD
Bed4RPBDVCVCEPPADADEDRP
Bed5EDRPRPBDVCVCEPPADAD
Tab.1  The sequence time of each step for five-bed
Fig.2  The first 240 s of the operation schedule of the five-bed PSA
Fig.3  The isotherms of components on Cu(I)Y adsorbent
ParameterCH4COCO2H2N2Unit
IP12.23×10-30.80.0577.25×10-41.45×10-3kmol/MPa
IP212.4×10-3297.128.74.03 ×10-38.06×10-31/ MPa
Dm2.48×10-51.41×10-50.90×10-57.36×10-51.31×10-5m2/s
MTC0.0690.0530.0920.1190.0771/s
ΔH-18.500-56.078-23.170-16.500-14.900kJ/mol
Cpa32.2424.8137.2728.8629.03kJ/(kmol·K)
Tab.2  Isotherm constants and the physical properties of components
Fig.4  The isotherms of CO at different temperatures on Cu(I)Y adsorbent
ParameterValueUnitDescription
Db0.25mInternal diameter of adsorbent layer
Hb1.00mHeight of adsorbent layer
?b0.35m3 void/m3 bedInter-particle voidage
?p0.45m3 void/m3 beadIntra-particle voidage
ρs632Kg/m3Bulk solid density of adsorbent
Rp0.003mAdsorbent particle radius
ψ1.00-Adsorbent shape factor
Cps0.95kJ/(kg·K)Heat capacity of solid phase
Cpw0.504kJ/(kg·K)Heat capacity of wall, kJ/(kmol·K)
ap403.11m2/gSpecific surface area of adsorbent
Hw65.0W/(m2·K)Heat transfer coefficient between wall and gas
Kg0.247W/(m·K)Heat conductivity of gas phase
Ks0.3W/(m·K)Heat conductivity of solid phase
Kw17.0W/(m·K)Heat conductivity of wall
ρw7800.0kg/m3Density of wall
WT0.01mWall thickness
Tamb303.15KAmbient temperature
Tab.3  The parameters for adsorption bed and adsorbent
AdsorbentAdsorption capacity/(mmol?g-1)AdsorbentAdsorption capacity/(mmol?g-1)
Cu2Y-0.5M1.4099Cu2Y-1.0M1.6704
Cu3Y-0.5M2.1385Cu3Y-1.0M2.0052
Cu4Y-0.5M1.7758Cu4Y-1.0M1.5328
Tab.4  The adsorption capacity of adsorbents
Fig.5  The breakthrough curve of NaY, Cu(I)Y and simulation
Vacuum temperature/°CRe-adsorption capacity/(mmol?g-1)Desorption/%
300.488746.16
700.507347.91
1100.643060.73
1200.767072.43
Tab.5  The results of desorption at different vacuum temperature
Purging temperature/°CRe-Adsorption capacity/(mmol?g-1)Desorption /%
300.570253.84
700.651661.54
1000.896084.61
1100.950489.75
1201.000594.48
1301.050599.10
1401.050999.14
Tab.6  The results of desorption at different purging temperature
Flow rate of waste gas/(m3?h-1)CO purity in product gas /%CO recovery in product gas /%CO concentration in replacement gas /%CO concentration in waste gas /%
3.097.6192.996.991.34
3.297.6691.388.141.33
3.497.9690.2510.821.38
3.697.9388.7712.091.37
3.898.0086.5814.391.40
Tab.7  The simulation results at different outlet flow rate of the waste gas
Flow rate of replacement gas /(m3?h-1)CO purity in product gas/%CO recovery in product gas/%CO concentration in replacement gas/%CO concentration in waste gas/%
2.295.1699.442.981.24
2.496.6296.414.461.31
2.697.4193.427.101.35
2.897.9590.2510.821.38
2.998.1288.4712.531.38
Tab.8  The simulation results at different flow rate of the replacement gas
ComponentCH4%CO %CO2%H2%N2%
Product gas0.0497.951.310.450.25
Waste gas2.971.382.5370.0125.61
Replacement gas4.1710.822.3956.1926.43
Recovery56.1890.2538.9229.150.40
Tab.9  The simulation results when waste gas flow rate is 3.4 m/h and replacement gas flow rate is 2.8 m/h
Fig.6  The profiles of pressure at the end of five beds in a cycle
Fig.7  Profiles of CO concentration of bed 1 in axial distribution in a cycle
Fig.8  Profiles of CO adsorption capacity of bed 1 in axial distribution in a cycle
ciConcentration of component i, mol/L
cbGas concentration of gas-solid interface, mol/L
cgConcentration of gas phase, mol/L
ρsBulk density of solid, kg/m3
ρgDensity of gas, kg/m3
ρwDensity of wall, kg/m3
DBInner diameter of adsorption bed, m
HBThe height of adsorption bed, m
RpRadius of the particle, m
ψForm factor, 1
DaxAxial diffusion coefficient, m2/s
DmDiffusion coefficient, m2/s
MMolecular weight, g/mol
PiPartial pressure of component i, Pa
ωiAdsorption capacity of component i, kmol/kg
MTCiAdsorption rate constants, 1/s
CvgHeat capacity of gas phase, kJ/(kmol·K)
CpsHeat capacity of solid phase, kJ/(kmol·K)
CpwHeat capacity of wall, kJ/(kmol·K)
Cpa,iHeat capacity at constant pressure of gas phase, kJ/(kmol·K)
TgTemperature of gas phase, K
T0Temperature of wall, K
TsTemperature of solid phase, K
HwHeat transfer coefficient between wall and gas, W/(m2·K)
Qstisosteric heat of adsorption, kJ/mol
ΔHAdsorption enthalpy change, kJ/mol
KgHeat conductivity of gas phase, W/(m·K)
KsHeat conductivity of solid phase, W/(m·K)
KwHeat conductivity of wall, W/(m·K)
WTWall thickness, m
vgInterstitial velocity, m/s
?bBed void fraction, m3 void/m3 bed
?pParticle porosity, m3 void/m3 bead
μViscosity, Ns/m2
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