(chemical engineering)
A fixed-bed catalytic process to desulfurize and hydrogenate a wide range of charge stocks, from gases through waxes; the catalyst comprises cobalt oxide and molybdenum oxide on an extruded alumina support and may be regenerated in place by air and steam or flue gas.



a process of selective hydrogenation of organic sulfur, nitrogen, and oxygen compounds found in motor fuels (gasoline, kerosene, and diesel fuel), oils, and other petroleum products (for example, in raw materials for catalytic reforming). When hydrogen is added, such compounds form hydrogen sulfide, ammonia, and water, which are removed from the product being refined.

Hydrofining occurs in the presence of a hydrogenating catalyst, such as cobalt alumomolybdate, at temperatures of 260°-430° C under a pressure of a hydrogen-containing gas of 1-10 meganewtons per sq m (MN/m2), or 10-100 kilograms-force per sq cm (kgf/cm2), and requires considerable quantities of hydrogen (to reduce the sulfur content by 1 percent, 9-18 cu m of hydrogen is needed for every cu m of raw material). Therefore, hydrofining installations are usually combined with catalytic reforming installations, which produce excess hydrogen. The hydrogen sulfide formed during hydrofining is collected and is used in producing sulfur and sulfuric acid. As a result of hydrofining, the quality of petroleum products is improved and equipment corrosion and air pollution are reduced. The hydrofining of lubricating oils, which is used instead of contact purification with clay, improves the color and smell of the oil and reduces its acidity and coking capacity. The hydrofining process has acquired special significance in connection with the processing of large quantities of sulfurous and high-sulfur petroleum (more than 1.9 percent sulfur).


Tekhnologiia pererabotki nefti i gaza. Part 3: N. I. Chernozhukov, ”Ochistka nefteproduktov i proizvodstvo spetsial’nykh produk-tov.” Moscow, 1966.


References in periodicals archive ?
The Company received The National Scientific Technology Progress Special Award for its safe and efficient exploration technology and industrialized utilization of major ultra-deep sour gas fields, and the Gold Award of China Patent was granted to the Company for its ethylbenzene production method from benzene and ethylene by alkylation and for its hydrofining method for caprolactam.
A fire broke out at Hydrofining Unit 10 at the Baytown refinery, a giant refining and petrochemical complex on the Houston Ship Channel east of Houston, according to a notice the refinery filed.
The quality of oil refined through hydrofining is high.
It is part of a major investment program to increase the Petromidia Refinery's hydrofining capacity, to bring product qualities exclusively to Euro 5 standards, and to increase processing capacity to 5 million tons per year.
Exxon shuts hydrofiner HOUSTON: ExxonMobil reported flaring from the planned shutdown of a hydrofining unit at its 560,640 barrel-per-day (bpd) refinery in Baytown, Texas, the nation's largest, according to a filing with Texas pollution regulators.
Additionally, the Company successfully developed technologies to improve the recovery rate in oil fields with complex faultage, flexible and diversified FCC technology (FDFCC), sulfur removal and olefin content reduction technology through selective hydrofining of catalytic gasoline (RIDOS), and 150 thousand tonnes per year three-reactor PET technology.