Described herein are methods and systems for performing liquid-liquid extraction in bulk tankage. According to certain embodiments, the liquid-liquid extraction can occur in a bulk tank via a circulation loop, in which a solvent mixture is injected with the hydrocarbon ahead of mix valves on the circulation loop. According to other embodiments, a misting system is installed in the vapor or head space of bulk tankage. The misting system distributes small micro-drops of a solvent mixture so as to cause a uniform lay down over the entire top surface area of hydrocarbon. The solvent mixture migrates from the top surface of the hydrocarbon to the bottom of the bulk tank, reacting during migration to cause liquid-liquid extraction.

Described herein are methods and systems for performing liquid-liquid extraction in bulk tankage. According to certain embodiments, the liquid-liquid extraction can occur in a bulk tank via a circulation loop, in which a solvent mixture is injected with the hydrocarbon ahead of mix valves on the circulation loop. According to other embodiments, a misting system is installed in the vapor or head space of bulk tankage. The misting system distributes small micro-drops of a solvent mixture so as to cause a uniform lay down over the entire top surface area of hydrocarbon. The solvent mixture migrates from the top surface of the hydrocarbon to the bottom of the bulk tank, reacting during migration to cause liquid-liquid extraction.

A process and a system for reforming and upgrading a heavy naphtha feedstock may include dehydrogenating naphthenes in the heavy naphtha feedstock to form a first effluent stream comprising aromatics and then separating the aromatics via extraction from the produced first effluent stream to produce a second effluent stream containing raffinate paraffins. The process may then include subjecting the second effluent stream to cyclization reactions to produce a third effluent stream comprising aromatics and then combining the first effluent stream and the third effluent stream prior to extraction

Proposed is a process of producing a high-quality lube base oil using a refined oil fraction obtained from waste lubricant as a feedstock. The process includes purifying waste lubricant to obtain a refined oil fraction, pretreating the refined oil fraction, and blending the pretreated refined oil fraction with unconverted oil (UCO), before or after vacuum distillation and catalytic dewaxing of the unconverted oil, or between the vacuum distillation and the catalytic dewaxing of the unconverted oil.

Proposed is a process of producing a high-quality lube base oil using a refined oil fraction obtained from waste lubricant as a feedstock. The process includes purifying waste lubricant to obtain a refined oil fraction, pretreating the refined oil fraction, and blending the pretreated refined oil fraction with unconverted oil (UCO), before or after vacuum distillation and catalytic dewaxing of the unconverted oil, or between the vacuum distillation and the catalytic dewaxing of the unconverted oil.

A process is provided including subjecting a raw C.sub.5 stream containing C.sub.5 diolefins to extractive distillation to form C.sub.5 diolefins and a raffinate stream. The process includes subjecting the raffinate stream to dehydrogenation to form additional C.sub.5 diolefins, which are recycled to the extractive distillation. Another process includes modifying a C.sub.5 diolefin extractive distillation unit by forming a recycle loop with a C.sub.5 olefin dehydrogenation reactor. A system is provided that includes a C.sub.5 diolefin extractive distillation unit and a C.sub.5 olefin dehydrogenation reactor that are arranged in a recycle loop. A process is provided that includes subjecting a raffinate stream containing C.sub.5 olefins from an extractive distillation unit to dehydrogenation to form C.sub.5 diolefins.

A process is provided including subjecting a raw C.sub.5 stream containing C.sub.5 diolefins to extractive distillation to form C.sub.5 diolefins and a raffinate stream. The process includes subjecting the raffinate stream to dehydrogenation to form additional C.sub.5 diolefins, which are recycled to the extractive distillation. Another process includes modifying a C.sub.5 diolefin extractive distillation unit by forming a recycle loop with a C.sub.5 olefin dehydrogenation reactor. A system is provided that includes a C.sub.5 diolefin extractive distillation unit and a C.sub.5 olefin dehydrogenation reactor that are arranged in a recycle loop. A process is provided that includes subjecting a raffinate stream containing C.sub.5 olefins from an extractive distillation unit to dehydrogenation to form C.sub.5 diolefins.

Process for the production of C6-C7 aromatic compounds from a hydrocarbon feedstock of naphtha type comprising the following stages: a) the said feedstock (1) is sent into a first fractionation unit (2) in order to obtain an upper stream (3) comprising C6 and C7 hydrocarbon compounds and a lower stream (4) comprising C8 to C10 hydrocarbon compounds; b) the upper stream (3) and a stream (12) comprising C6 and C7 aromatic compounds obtained on conclusion of stage e) are sent into a unit for extraction of the aromatics (5) in order to obtain an aromatic base (6) and a liquid effluent (7); c) the liquid effluent (7) is sent into a first catalytic reforming unit (8) in order to obtain a first reformate effluent (9); d) the said first reformate effluent (9) is sent into a reformate separation section (10) in order to obtain a first stream (11) comprising C5 hydrocarbon compounds and a second stream (12) comprising C6 and C7 aromatic compounds; e) the second stream (12) comprising C6 and C7 aromatic compounds is recycled in stage b).

Process for the production of C6-C7 aromatic compounds from a hydrocarbon feedstock of naphtha type comprising the following stages: a) the said feedstock (1) is sent into a first fractionation unit (2) in order to obtain an upper stream (3) comprising C6 and C7 hydrocarbon compounds and a lower stream (4) comprising C8 to C10 hydrocarbon compounds; b) the upper stream (3) and a stream (12) comprising C6 and C7 aromatic compounds obtained on conclusion of stage e) are sent into a unit for extraction of the aromatics (5) in order to obtain an aromatic base (6) and a liquid effluent (7); c) the liquid effluent (7) is sent into a first catalytic reforming unit (8) in order to obtain a first reformate effluent (9); d) the said first reformate effluent (9) is sent into a reformate separation section (10) in order to obtain a first stream (11) comprising C5 hydrocarbon compounds and a second stream (12) comprising C6 and C7 aromatic compounds; e) the second stream (12) comprising C6 and C7 aromatic compounds is recycled in stage b).

Processes and apparatuses are disclosed for treating a naphtha stream from a FCC unit comprising passing the naphtha stream to a naphtha splitter column to provide a light naphtha stream and a heavy naphtha stream. The light naphtha stream is reacted in a mercaptan oxidation reactor to provide a demercaptanized naphtha stream. The demercaptanized naphtha stream is stripped in a light stripper column to provide a treated light naphtha stream and a bottoms stream.