Zero waste hydrogen sulfide and light mercaptans stripping from oil

Process Description
Feedstock – oil after the terminal separation unit is fed into upper part of desorber 1. Circulating treated APG is fed to lower part of desorber 1 from unit 2. Desulfurized oil is removed from bottom of desorber 1, and stripping gas from overhead of desorber 1 is sent 6 to desulfurization unit 2, where it is treated with a regenerated absorbent based on iron chelate complexes, and treated gas is forcedly recirculating. Air is supplied to unit 2 for regeneration of absorbent, off-gas and sulfur suspension is removed from unit 2, which is mixed into feed and then dissolved.

Process features

• Hydrogen sulfide and light mercaptans stripping with circulating gas
• Chelate treatment of circulating gas to produce non-volatile products that dissolve in oil, which does not deteriorate quality
• Formal absence of waste
• Limitation of production

Technical Specification

• Oil temperature 35-45 °C
• Pressure 0,05-0,55 MPa
• Oil capacity up to 120 t/h
• Hydrogen sulfide content in refined oil: no more than 20 mg/kg
• The content of light mercaptans in refined oil: no more than 40 mg/kg

Patents of the Russian Federation No.
2510640, 2624625

Development level, industrial application

• Developed design concepts