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gas chromatograph (GC).pptx

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gas chromatograph (GC).pptx

  1. 1. gas chromatograph (GC)
  2. 2. G a schrom atograp h yisate c h n iq u efo rs e p aratin gc h e m icals u b sta n c e sth at relieso ndifferencesinpartitioningbehaviorb e twe e naflowingmobilep h a s ea n d astationaryp h a s etoseparatethec o m p o n e n t sinamixture.T h eflameionization d etecto r(F ID )isth em o sts e n sitiveg aschrom atograp h icd etectorfor hy drocarbonss u c hasbutaneorhexane. Principle of g a s chromatography : T h e s a mp le solution injected into the instrument enters ag a sstreamwh ic htransports the s a mpleinto aseparation tubek n o w nasthe"column."(Heliumornitrogenisu s e dastheso-calledcarrier gas.) T h e various c o m p o n e n t s are separated inside the column. T h e detector m e a s u re sthe quantity of the c o m p o n e n t sthat exit the column. T om e a s u r ea s a mp le with a n u n k n o w n concentration, a standard s a mp le with k n o w n concentrationisinjectedintotheinstrument.T h estandards a mp lep e akretention time(appearancetime)a n dareaarec o m p a r e dtothetests a mp letocalculatethe concentration.
  3. 3. Type of GC at Chem. Eng. Department Agilent 6890 Gas Chromatograph with Flame Ionization Detector (GC-FID)
  4. 4. Type of GC at Chem. Eng. Department 2. Shimazu 14 A Gas Chromatograph with Thermal Conductivity Detector (GC- TCD)
  5. 5. Phase Applications Polarity Temperature range °C HP-FFAP (Nitroterephthalic acid modified polyethylene glycol) (0.52 um, 0.32mm I.D.X25 m long) Acids, Alcohols, Aldehydes, Acrylates, Ketones, Nitriles High polarity 60 – 240/250 °C Inno-Wax (polyethylene glycol (PEG) (0.5 um, 0.32mm I.D.X30 m long) Alcohols, Free Acids, Aromatics, Essential Oils, Solvents High polarity -20 – 260 °C HP-1 (Cross linked Methyl Siloxane) (0.88 um, 0.53mm I.D.X5 m long) hydrocarbons, pesticides, polychlorinated biphenyls (PCBs), and sulfur compounds. non polar -60 – 325/350 o HP-5 (5%-Phenyl)-methylpolysiloxane) (0.1 um, 0.1mm I.D.X10 m long) Alkaloids, drugs, FAMEs, halogenated compounds, aromatic compounds non polar -60 – 325/350 o DB-Wax (Polyethylene glycol (PEG) (0.25 um, 0.32mm I.D.X30 m long) Alcohols,glycols, aromatics polar 40-240 °C List of Capillary Column
  6. 6. GC Column Phase Selection Guide
  7. 7. Features of HP-1 Column
  8. 8. HP-5
  9. 9. Phase Applications Molecular Sieve 5A (80/100 mesh, 3mm I.D.X2 m long) a)The strong ionic forces of the divalent calcium ion makes it an excellent adsorbent to remove water, CO2, H2S from sour natural gas streams, while mini missing COS formation. Light mercaptans are also adsorbed. b) Separation of normal- and iso paraffin’s. c)Production of high purity N2, O2, H2 and inert gases from mixed gas streams d)Static, (non-regenerative) dehydration of insulating glass units, whether air filled or gas-filled. Porapak Q (50/80 mesh, 3 mm I.D. X 3 m long) atmospheric gases to organics. Porapak R (50/80 mesh, 3 mm I.D. X 3 m long) analysis of gases, acids, amines, organics of low carbon number and water
  10. 10. Inorganic gases
  11. 11. Inorganic gases
  12. 12. Resources and references • https://www.slideshare.net/shaisejacob/gas-chromatography- ppt • https://www.agilent.com/en/products/gas-chromatography/gc- columns/capillary#0 . • Robert L.Grob. “Modern Practice of Gas Chromatiograhy” 2nd Edition . John Wilet& Sons, N.Y. Singapore, 1985. • D.A.Skoog. “Principles of Instrumental Analysis” 3rd Edition, Saunders College Publishing, 1985.

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