Metals, such as mercury, may be removed from glycol fluids by applying a sulfur compound having the general formula HS—X, wherein X is a heteroatom-substituted alkyl, cycloalkyl, aryl, and/or alkylaryl group either alone or in combination with or as a blend with at least one antifoam additive, at least one demulsifier and/or a buffering agent, to chelate the at least one metal and form a chelate complex of the sulfur compound with the at least one metal and then separating the chelate complex from the fluid.

Metals, such as mercury, may be removed from glycol fluids by applying a sulfur compound having the general formula HS—X, wherein X is a heteroatom-substituted alkyl, cycloalkyl, aryl, and/or alkylaryl group either alone or in combination with or as a blend with at least one antifoam additive, at least one demulsifier and/or a buffering agent, to chelate the at least one metal and form a chelate complex of the sulfur compound with the at least one metal and then separating the chelate complex from the fluid.

A process and system for producing deasphalting and demetallized oil from an initial feed such as a heavy feed is provided. The feed is contacted with an effective quantity of solvent to promote phase separation, to produce an asphalt phase and a reduced asphalt content phase. The reduced asphalt content phase is contacted with an effective amount of solid adsorbent to remove undesirable metal compounds to produce an oil phase substantially-free of asphalt and substantially-free of metal. The oil phase that is substantially-free of asphalt and substantially-free of metal is subjected to flash separation to produce a solvent fraction for recycle and an oil phase effluent substantially-free of asphalt and substantially-free of metal for recovery as the desired product.

Metals, such as mercury, may be removed from aqueous, hydrocarbon, or mixed oilfield or refinery fluids by: applying a sulfur compound having the general formula HS-X, wherein X is a heteroatom substituted alkyl, cycloalkyl, aryl, and/or alkylaryl group either alone or in combination with or as a blend with at least one demulsifier, a buffering agent, a pour point depressant, and/or a water clarifier to chelate the at least one metal and form a chelate complex of the sulfur compound with the at least one metal and then separating the chelate complex from the fluid.

Metals, such as mercury, may be removed from aqueous, hydrocarbon, or mixed oilfield or refinery fluids by: applying a sulfur compound having the general formula HS-X, wherein X is a heteroatom substituted alkyl, cycloalkyl, aryl, and/or alkylaryl group either alone or in combination with or as a blend with at least one demulsifier, a buffering agent, a pour point depressant, and/or a water clarifier to chelate the at least one metal and form a chelate complex of the sulfur compound with the at least one metal and then separating the chelate complex from the fluid.

Provided are a mineral base oil satisfying the following requirements (I) to (IV), which is excellent in safety and environmental aspects and has good compatibility with resin; a molded article formed of a resin composition containing the mineral base oil and a resin; and a method for producing the mineral base oil. Requirement (I): The flash point is 200° C. or higher. Requirement (II): The pour point is 0° C. or lower. Requirement (III); The aromatic content (% C.sub.A) is 2.6 or more. Requirement (IV): The toluene content, as measured according to JIS A1965:2015, is more than 0 μg/m.sup.3 and less than 500 μg/m.sup.3.

Provided are a mineral base oil satisfying the following requirements (I) to (IV), which is excellent in safety and environmental aspects and has good compatibility with resin; a molded article formed of a resin composition containing the mineral base oil and a resin; and a method for producing the mineral base oil. Requirement (I): The flash point is 200° C. or higher. Requirement (II): The pour point is 0° C. or lower. Requirement (III); The aromatic content (% C.sub.A) is 2.6 or more. Requirement (IV): The toluene content, as measured according to JIS A1965:2015, is more than 0 μg/m.sup.3 and less than 500 μg/m.sup.3.

A method for producing a diesel having improved cold flow properties, the method comprising the steps of introducing a crude oil to a distillation column, separating the crude oil in the distillation unit to produce a light gas oil, and a light vacuum gas oil, where the light gas oil has a T95% cut point in the range between 300 deg C. and 340 deg C., where the light vacuum gas oil has a T95% cut point in the range between 400 deg C. and 430 deg C., processing the light vacuum gas oil in the supercritical water unit to produce an upgraded vacuum gas oil, separating the upgraded vacuum gas oil in the fractionator to produce an upgraded light fraction, an upgraded light gas oil, and upgraded heavy fraction, introducing the upgraded light gas oil into a diesel pool, and blending the light gas oil into the diesel pool.

A method for producing a diesel having improved cold flow properties, the method comprising the steps of introducing a crude oil to a distillation column, separating the crude oil in the distillation unit to produce a light gas oil, and a light vacuum gas oil, where the light gas oil has a T95% cut point in the range between 300 deg C. and 340 deg C., where the light vacuum gas oil has a T95% cut point in the range between 400 deg C. and 430 deg C., processing the light vacuum gas oil in the supercritical water unit to produce an upgraded vacuum gas oil, separating the upgraded vacuum gas oil in the fractionator to produce an upgraded light fraction, an upgraded light gas oil, and upgraded heavy fraction, introducing the upgraded light gas oil into a diesel pool, and blending the light gas oil into the diesel pool.

Hydrocracked bottoms fractions are treated to separate HPNA compounds and/or HPNA precursor compounds and produce a reduced-HPNA hydrocracked bottoms fraction effective for recycle, in a configuration of a single-stage hydrocracking reactor, series-flow once through hydrocracking operation, or two-stage hydrocracking operation. A process for separation of HPNA and/or HPNA precursor compounds from a hydrocracked bottoms fraction of a hydroprocessing reaction effluent comprises contacting the hydrocracked bottoms fraction with an effective quantity of a sulfonation agent to produce corresponding sulfonated HPNA compounds and/or sulfonated HPNA precursor compounds, and to form a sulfonated hydrocracked bottoms fraction. The sulfonated hydrocracked bottoms fraction is separated into an HPNA-reduced hydrocracked bottoms portion and a sulfonated HPNA portion. All or a portion of the HPNA-reduced hydrocracked bottoms portion is recycled within the hydrocracking operation.