H2S and CO2 measurements in amines

Analyzer for determination of H2S and CO2 content in amines (MDEA, DEA)

Methyldiethanolamine and diethanolamine solutions or their mixtures with various additives are widely used for natural gas purification from sulfides. The analyzer has been developed to control a regeneration process of ethanolamines. The instrument determines a content of H2S and CO2 in regenerated and in non-regenerated amines, that allows to improve desulfurization process.

The analyzer is based on chromatograph PGC 90.50 equipped with the vapor phase analysis device. The principle of operation is the following:

The amines solution is supplemented with certain volume of acid, thereafter required compounds are determined in a vapor phase by means of gas chromatography method. Calibration runs automatically using a test mixture. There is a sample conditioning system and a stand with reagent containers.

The sample conditioning system has an amine line of supply which consists of the filter, needle-valve, amine and acid sampling valve, switching valve for calibration mixture supply and head-space device with thermoregulation system . Optionally the sample system can be equipped with a switching valve in order to provide a sample from several process lines.

Metrological specifications

Determined components ……….....H2S, CO2
Concentrations range..................0,01 – 10 g/l
Detection limit ..............................≤ 0,002 g/l
RSD.......................................................≤ 7 %

Technical characteristics

Power supply.................................................            220 V,  50 hz,  380 W max.
                                                                                  60 w for operation mode
Carrier gas......................................................           Helium     0,2-0,6 MPa
                                                                                  Flow rate…≤ 100 ml/min
                                                                                  air……...  ≤  0,2-0,6 MPa
                                                                                  flow rate ..≤ 100 ml/min
Dimensions (H*W*D)...............................              analyzer  1350*550*500 mm
                                                                                 stand with the reagent  1750*500*450 mm
Weight..........................................................            analyzer  50 kg, stand 12 kg
Hazardous Class         .                                           EEx d 11C  T4
Ambient temperature.....................................           +5 … +30 °С
Sample pressure..........................................   ≤  0,2 MPa
Serial output…............................................     RS 485
Cycle time...................................................    24 min