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Kh mang trong GCNgi hng dn: Trn Trung TuynThc hin : Group 7 - NSRP11

Kh mangTrong GC, kh mang ch n gin l vn chuyn cc phn t hi cht phn tch qua cc ct, ti detector trong qu trnh phn tch.Kh mang l kh nn m c th gin n khi tng nhit . S chn lc v vn tc tuyn tnh ca kh mang s nh hng n phn tch v thi gian lu trong phn tch GC

22Nhng yu cu ca kh mangKh mang phi tr vi pha tnh v khng c cha cc cht gy nhim ( tinh khit 99,95%). Cc cht khng c php c trong kh mang l O2, CO2, hi nc v cc halogenPh hp vi detectorD s dngKhng c nguy c pht chyCho hiu qu tch l tt nhtDng kh mang phi m bo duy tr tc ti u trong sut qu trnh

3H thng cung cp kh mangH thng cung cp kh mang bao gm cc b iu chnh p sut, cc thit b o p sut v thit b o tc dng.H thng kh mang cn cha mt h thng lc phn t tch nc v cc cht nhim bn khcTc dng c kim sot bi cc b iu chnh p sut hai giai on c lp vo cc bnh cha kh mangp sut ca kh vo thit b :10 - 50 psi, tc dng : 30 - 150 ml/ph (ct nhi) v 1 - 25 ml/ph (ct mao qun)

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H thng cung cp kh mangCc yu t nh hng n kh mangVn tc tuyn tnh nht khuch tnVn tc tuyn tnh ca kh mangVn tc tuyn tnh ca kh mang tuyn ng vai tr quan trng trong hiu qu ca GCVn tc tuyn tnh ti u l c trng cho mi loi kh mangng cong Van Deemter v Golay Plots c s dng chng minh vn tc tuyn tnh ti u ca kh mang

Vn tc tuyn tnh ca kh mang

H=A + B/ + cHETP has also been used for HA is the Eddy Diffusion termB is the Molecular Diffusion termC is the Resistance to Mass Transfer Term is the carrier gas linear velocityVn tc tuyn tnh ca kh mang

9Vn tc tuyn tnh ca kh mangVn tc tuyn tnh c th nh hng n thi gian tng th ca qu trnh phn tch v hiu qu ca s phn tch

Vn tc tuyn tnh ca kh mangVn tc tuyn tnh ca kh mang ph thuc vo nhit

nh hng ca vn tc tuyn tnh ti tR

He : vn tc tuyn tnh ti u l 25 cm/s. Thi gian phn tch khong 14 pht v hiu qu tch l 86%. Khi tng tc kh He n 50 cm/s, thi gian phn tch gim xung cn khong 7 pht v gim hiu qu tch xung cn khong 43%.

12nh hng ca vn tc tuyn tnh ti tR

H2 : Vn tc tuyn tnh ti u khong 50 cm/s. Khi gim vn tc tuyn tnh cn 10 cm/s. Thi gian lu tng ng tng v hiu sut ct gim mnh, thi gian phn tch tng13 nht ca kh mang nht ca kh mang l mt tham s ph thuc vo nhit Khi nhit tng, nht ca cc kh tng.Khi s dng mt ch p sut khng i cho kh mang, theo chu trnh nhit , nht ca cht kh s tng ln.

nht nh hng n vn tc tuyn tnh ca kh mang trong ton b chu trnh nhit v c th lm thay i kiu pick trong qu trnh gii hp. nht ca kh mang t l vi gim p sut ca dng kh i vo ct.Ch dng chy lin tc c th c s dng gim thiu nhng thay i nht ca kh cho cc phn tch theo chu trnh nhit

nht ca kh mang nht ca kh mang

nht ca kh mang

nht ca kh mangS khuch tnS khuch tn : xc nh tc khuch tn ca mt hi cht tan trong cht kh nht nh.H2 v He c khuch tn tng t nhau. N2 thp hn 4 ln.

Kh mang khuch tn (butane, 100C [m2s])H26 . 106He5,5 . 106N21,5 .106S khuch tnTc khuch tn ca kh mang nh hng n tc trong phn tch GC.Khi khuch tn tng, thi gian phn tch s gim.

u nhc ca cc loi kh mangKh mangu imNhc imH2Vn tc tuyn tnh ti u ln, nht thp, h s khuch tn ln=> tc phn tch nhanh, hiu sut ttt ph thuc nhit .- D chy n, Khi s dng hydro lm kh mang, cn dng nit lm kh bo v thi qua ct trc- C th phn ng vi olefin.He, ArVn tc tuyn tnh kh ln, h s khuch tn cao, tr v mt ha hc.Thch hp cho phn tch nhit cao.Gi thnh caoArgon c nht tng i cao v vy thi gian phn tch lu hn.N2- Tr, gi thnh r, d lm tinh khit.Thi gian phn tch lu dn nhit ca N2 rt gn vi dn ca nhiu kh v hi nhiu cht hu c nn c trng hp pic sc k c th b ngc.Ngy nay, khong 90% kh mang s dng cho GC l He.H2 l s la chn tt nht cho GC s dng ct mao qun do khuych tn v khong lm vic rng tuy nhin do d chy n nn H2 t c s dng hn HeMt s gi s dng kh mang cho GC

Kh mang s dng cho GC BSRMethodCht phn tchDetector

Kh mangYu cuASTM D2163C1-C4FIDHe tinh khit > 99.95%ASTM D2712Vt hydrocacbon, C1-C4FIDHe, N2ASTM D4629Vt Nitogen trong sn phm du m ha lng (nhit si < xng)ChemiluminescentHe, Ar tinh khit > 99.995%ASTM D4929Clo hu c trong du thASTM D5453Lu hunh tng trong Hydocacbon nh, nhin liu xng, diesel, du ng cUltraviolet Fluorescence He, Ar tinh khit: > 99.998%Moisture < 5ppm w/wASTM D5580Benzen, Toluen, Etylbezen,p,om-xylen, C9 v aromatic C9, FID,TCDHe tinh khit > 99.95%

ASTM D6228Hp cht S trong kh t nhin, kh nhin liuFPDHe, N2 tinh khit > 99.999%

Kh mang s dng cho GCMethodCht phn tchDetectorKh mangYu cuASTM D6667Tng hi S trong hydrocacbon kh v LPGUltraviolet FluorescenceAr, He tinh khit > 99.998%Moisture < 5mg/kg

ASTM D6733Cu t c lp trong nhin liu ng c t trongFIDHe tinh khit > 99.99% mol

ASTM D6839Hydrocacbon, oxygenated, benzene trong nhin liu ng c t trongFIDHe tinh khit > 99.999%;H2O < 0.1 mg/kg

ASTM D4815

Xc nh Oxygenated trong xng.TCD hoc FIDHe tinh khit > 99.95% mol

Kh mang s dng cho GCMethodCht phn tchDetectorKh mangYu cuUOP 910XcAr tinh khit > 99.95%

UOP 960Hydrocacbon trong sn phm du m ha lngFIDH2 tinh khit > 99.95%

UOP 539

Thnh phn ca kh nh my lc du, LPG m rngTCDN2 tinh khit > 99.95%