Abstract
Determination of hydrogen sulfide, (H2S) in crude oil is very important due to the environmental impacts, industrial problems and legal international limitation of transportation. In the present work, H2S of crude oil is determined by liquid-liquid extraction followed by potentiometric titration. Three factors including dilution ratio of crude oil with toluene, extraction time of H2S into the caustic phase and API of crude oil was investigated via factorial design. The ANOVA results revealed that the dilution ratio, crude type and extraction time have the highest effect of the recovery of H2S from crude oil. The linear dynamic range of the method was from 1 up to 2000 ppm which can be manipulated for lower or higher concentration by further optimization of the above-mentioned parameters. This method is rapid, reliable, operator-independent which make it a useful technique for the field test of crude oil and overcome extreme uncertainty of H2S measurement.
Highlights
H2S is one of the most hazardous compounds which is colorless gas and can dissolved in aqueous and organic solvents
A rapid method was developed and investigated using factorial experimental design for the determination of H2S of crude oil which can be used in laboratory or field test and led to the repeatable and accurate results
It is generally known that crude oil has very broad range of properties in term of density and viscosity
Summary
H2S is one of the most hazardous compounds which is colorless gas and can dissolved in aqueous and organic solvents. It is a poisonous and corrosive compound. It causes environmental damages [1,2,3]. H2S can be present in petroleum and petroleum products including asphalt, residual fuel oil, mid-distillates and their blend, natural gas and LPG [4,5,6].
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