Catalytic Hydrosulfurization is used to improve the quality of light distillates by removing sulfur compounds. The feed stock contains sour distillates from the crude tower. The feed is vaporized, mixed with hydrogen rich process gas, and passed over a catalyst which converts organic sulfur to H2S. The reactor product is condensed and sent to a hot flash from where hydrogen is flashed off. It then moves to a cold flash drum where H2S is flashed off and sent to a Diethanolamine (DEA) absorber. The light distillate is sent to a stripper for removing contaminants and light hydrocarbon material for product quality control.
- Feed Inputs: Kerosene or LGO, and hydrogen
- Temperature / Pressure: Temps up to 670°F / 600 psi
- Products / Outputs: Off-gas, gasoline, jet fuel or low sulfur diesel
- Major Equipment Involved in the Catalytic Hydrosulfurization Process: surge drum, feed stripper, heaters, reactor, compressors, hot & cold flash drums, DEA absorber, product stripper, exchangers, fin fans, and pumps
- Safety Hazards to Consider: Hot oil, volatile light hydrocarbons, hydrogen, H2S, steam, and rotating equipment.
Catalytic Hydrosulfurization is a continuous process and the streams are contained in piping and vessels. The potential for exposure is limited, but can occur during sampling, maintenance, or in the event of a leak, plant upset, or turnaround.
Skin, Eye: The CHD has the potential for skin contact with light distillate streams. Accidental skin contact with the liquid streams may cause slight irritation. Skin irritation can be severe if the liquid becomes trapped inside shoes or gloves. The distillates contain petroleum naphtha which has been shown to cause skin cancer. Avoid prolonged or repeated skin contact with any of these streams by using protective clothing, including impermeable gloves.