Online Process Gas Analyzer (VOC's)



Online system GC-FID/PID

The system is capable of continuous Volatile Organic Compounds (VOCs) analysis, present in process gases CO2 and N2 type at trace levels. The equipment performed automatically and coordinated, selection, concentration and analysis of the consigned sample by both channels simultaneously.


Ppm VOC level channel (alcohols, aldehydes, ketones halogenated):                   Ppb level BTEX channel (Benzene, Toluene, Ethylbenzene, Xylenes):

Acetaldehyde                  Ethyl Acetate                                                                          benzene                   p-xylene

Metanol                           2-Butanol                                                                               Toluene                    m-Xylene                                                            

Ethanol                           1-Bromopropane                                                                    o-xylene                   ethylbenzene      

Propionaldehyde            isobutanol                                                

Acetone                          n-butanol

Isopropanol                   iso-amyl acetate

t-butanol

n-propanol                     trichloroethylene                                                                               


The system has two analysis channels for both groups of VOCs and is based on an injection valve multiposition integrated to an Agilent 7890A GC, a sample flow controller and a double channel with injectors, columns and independent detectors, and adapted for simultaneous determination of the above components, all in a single analysis by automated and unattended way.

FID channel for the ppm level components (VOCs):

- Injection loop 1 mL managed by automatic valve.

- Specific composite capillary column (ref KRCIAPR0001).

- Capillary FID detector.

PID channel for the ppb level components (BTEX):

- Multimode Injector (MMI) modified with a specific trap (KRCIAPR0003) for the Thermal Desorption technique associated with a gas management valve.

- Specific composite capillary column (ref KRCIAPR0002).

- Detector PID (photoionization detector) of O.I. ANALYTICAL model 4430.

FID channel for VOCs in ppm (alcohols, aldehydes, ketones, halogenated) VOCs overlapping patterns, 1-bromopropane and trichlorethylene:

PID Channel for BTEX of ppb (Benzene, Toluene, Ethylbenzene, Xylenes) BTEX overlapping patterns:

Selectivity, Accuracy and Stability Chromatographic for BTEX channel
  AREA SD RSD %
Benzene 181.3 2.4 1.3
  tr min SD RSD %
Benzene 10.54 0.005 0.05
  - The analyzer allows the determination of all compounds at the required levels in 27 minutes using both channels simultaneously. - Allows separate and quantify all components of VOCs channel (VOCs, 1-bromopropane and trichlorethylene) in ppms level. - Allows separate and quantify the components of BTEX channel in ppbs level and the trichlorethylene in ppms. - The precision in quantifying the BTEXs at Thermal Desorption in the MMI injector is <2%. - The chromatographic selectivity and stability of the analyzer is less than 0.1%.