Removing H/sub 2/S from gas with recycled nmp extraction solvent

Patent · Tue Jun 17 04:00:00 EDT 1980

OSTI ID:5997320

Blume, J H; Bushnell, J D; Leighton, M D

An improved process is claimed for removing H/sub 2/S from a hydrofiner tail gas wherein said tail gas is passed into a scrubbing zone wherein it is contacted with liquid nmp to remove most of the H/sub 2/S from the gas to form an H/sub 2/S-rich nmp solution and the H/sub 2/S-rich nmp solution is heated and passed into a stripping zone to remove most of the H/sub 2/S from the nmp to form an H/sub 2/S-lean nmp solution, extracting a hydrocarbon oil with an nmp solution, recovering hot liquid, nmp from said extracted oil and combining it with said H/sub 2/S-lean nmp solution and wherein said combined solution comprises at least a portion of said nmp solution used to extract said oil, wherein the improvement comprises heating the H/sub 2/S-rich nmp solution to the required stripping temperature by indirectly contacting same, in heat exchange relationship, with at least a portion of said combined nmp solution. This process is especially useful for scrubbing H/sub 2/S from hydrofiner tail gas for use as once-through stripping gas in the solvent recovery section of a lube oil extraction process employing nmp as the extraction solvent, and in a preferred embodiment, the spent stripping gas from the lube oil solvent recovery is used as the stripping gas in the stripping zone of this invention.

• Assignee: Exxon Research and Engineering Co
• Patent Number(s): US 4208382
• OSTI ID: 5997320
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020800* -- Petroleum-- Waste Management
AMIDES
AZOLES
CHALCOGENIDES
EXTRACTION
GASEOUS WASTES
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
LACTAMS
LUBRICANTS
LUBRICATING OILS
MANAGEMENT
OILS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PYRROLES
PYRROLIDONES
RECOVERY
REMOVAL
SCRUBBING
SEPARATION PROCESSES
SOLVENTS
SULFIDES
SULFUR COMPOUNDS
WASTE MANAGEMENT
WASTES