METHOD OF PREPARING HYDROGEN SULPHIDE-CONTAINING OIL WITH HIGH CONCENTRATION OF HYDROGEN SULPHIDE Russian patent published in 2019 - IPC B01D53/52 B01D19/00 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry for preparation of hydrogen sulphide-bearing oil for transportation. Crude oil of hydrogen sulphide is fed via a pipeline into the separator of the first separation stage 1. Further, pumps 13 are pumped via heat exchangers 2 into oil heating unit 3. After heating, the hydrogen sulphide-containing oil is fed into the upper part of desorption tower 7 for purification from hydrogen sulphide by gas blowing. Gas is fed in amount of 3–10 m³/t oil depending on initial content of hydrogen sulphide (250–1500 million^-1) and required degree of oil cleaning from hydrogen sulphide of 20 or 100 million^-1. For stripping of hydrogen sulphide from oil through a gas line dry stripped gas is supplied, at that, blowing-out is carried out at temperature of 45–60 °C and absolute pressure in the desorption column of 0.14–0.18 MPa. Hydrogen sulphide-containing gas from desorption column 7 is fed after the gas is cooled to condensate collector 8. Gas is cooled down from desorption column 7 due to cold fresh water, which is then fed into oil flow before desorption column for desalting. Commercial oil purified from hydrogen sulphide from lower part of desorption column 7 is successively supplied to separator of hot separation stage 4, to unit for dehydration and desalting of oil, and via oil pipeline is pumped to system of main oil pipelines. Hydrogen sulphide-containing gas released during these operations is also fed into condensate collector 8 to separate the condensate, which is returned to the separator of the first separation stage 1. All produced gas from condensate collector 8 is supplied for reception of compressors of desulphurization unit and after purification from hydrogen sulphide is directed to gas processing plant.

EFFECT: proposed invention allows to reduce specific gas supply rate by at least 20–30 %, and as a result of supply of proposed gas volume of blowing light fractions from processed oil increases, which increases number of gas processing products.

1 cl, 1 dwg