A treatment process for remediating a contaminated liquid containing more than 5 ppm hydrogen sulfide (H.sub.2S) and substantially without formation of precipitate, includes steps of steps of adding an aqueous solution containing at least one hydroxide compound at a collective concentration of 35-55 wt % to the contaminated liquid to achieve a concentration of 125-5000 ppm of the hydroxide compounds in the contaminated liquid, adding at least one organic acid and to the liquid to achieve a concentration of 0.01-10 ppm in the contaminated liquid, and dispersing the aqueous solution and the at least one organic acid in the contaminated liquid and allowing the aqueous solution and the at least one organic acid to react with the contaminated liquid for a period of time until a concentration of hydrogen sulfide in the contaminated liquid is reduced to 5 ppm.

A plasmonic nanoparticle catalyst for producing hydrocarbon molecules by light irradiation, which comprises at least one plasmonic provider and at least one catalytic property provider, wherein the plasmonic provider and the catalytic property provider are in contact with each other or have distance less than 200 nm, and molecular composition of the hydrocarbon molecules produced by light irradiation is temperature-dependent. And a method for producing hydrocarbon molecules by light irradiation utilizing the plasmonic nanoparticle catalyst.

A process for producing C2 and C3 hydrocarbons by a) subjecting a mixed hydrocarbon stream comprising a middle distillate to first hydrocracking to produce a first hydrocracking product stream, b) subjecting a second hydrocracking feed stream to second hydrocracking to produce a second hydrocracking product stream, wherein the second hydrocracking is more severe than the first hydrocracking and c) subjecting a C4 hydrocracking feed stream to C4 hydrocracking optimized for converting C4 hydrocarbons into C3 hydrocarbons in the presence of a C4 hydrocracking catalyst to obtain a C4 hydrocracking product stream, wherein the C4 hydrocracking is more severe than the second hydrocracking. The first hydrocracking product stream, the second hydrocracking product stream and the C4 hydrocracking product stream are fed to a separation system.

The present invention relates to a method for treating a cracked stream stemming from a fluid catalytic cracker unit (FCCU) in order to improve propylene recovery. The present invention also relates to the corresponding installation to implement the method.

The present disclosure relates a system, including: a stripping column configured to separate hydrogen sulfide from natural gas liquids (NGL), the following fluidly connected to the stripping column: a first condensate input line, a second condensate input line, a condensate stripper feed line, a feed drum, an overhead gas product line, a bottoms product NGL line, a slip stream NGL line, a reboiler return line, and an external stripping gas line, wherein a portion of the slip stream NGL line is combined with the external stripping gas line and fed to the stripping column in a stripping gas feed line that is fluidly connected to the stripping column.

A process for catalytic cracking of hydrocarbon oils includes the step of contacting a hydrocarbon oil feedstock with a catalytic cracking catalyst in a reactor comprising a dilute-phase transport fluidized bed and a fast fluidized bed connected in series for reaction. In the fast fluidized bed, the axial solid fraction of the catalyst is controlled within the range of about 0.1 to about 0.2. When used for catalytic cracking of hydrocarbon oil feedstocks, particularly heavy feedstock oils, the process and system show lower yields of dry gas and coke, and good product distribution.

A process for hydrocracking 2,4-dimethylpentane and/or 2,2,3-trimethylbutane can comprise: contacting a hydrocracking feed stream in the presence of hydrogen with a hydrocracking catalyst, wherein the hydrocracking feed stream comprises at least 0.5 wt % of 2,4-dimethylpentane and/or 2,2,3-trimethylbutane, based upon a total weight of the hydrocracking feed stream; and wherein the hydrocracking catalyst comprises a medium pore zeolite having a pore size of 5-6 A and a silica to alumina molar ratio of 20-75; preferably the hydrocracking catalyst comprises a medium pore zeolite having a pore size of 5-6 A and a silica to alumina molar ratio of 20-75 and a large pore zeolite having a pore size of 6-8 A and a silica to alumina molar ratio of 10-80, wherein the hydrogenation metal is deposited on the medium pore zeolite and the large pore zeolite.

The present invention relates to a process for producing LPG from a hydrocarbon feed comprising polyaromatics, the process comprising contacting said feed in the presence of hydrogen with a M/A/zeolite catalyst under hydrocracking process conditions.

The present disclosure provides a system and method for converting crude oil to light hydrocarbon products useful as a chemical feedstock. The system may also include a conversion system, such as a steam cracking unit, that converts the chemical feedstock from the feed preparation system to useful hydrocarbon chemicals. Exemplary hydrocarbon chemicals produced by the conversion system include light olefins, such as ethylene, propylene, and/or butadiene.

Separation methods comprising: separating hydrogen sulfide from natural gas liquids (NGL) in a stripping column. Wherein the following are fluidly connected to the stripping column: a first condensate input line, a second condensate input line, a condensate stripper feed line, a feed drum, an overhead gas product line, a bottoms product NGL line, a slip stream NGL line, a reboiler return line, and an external stripping gas line. And feeding, to the stripping column in a stripping gas feed line fluidly connected to the stripping column, a portion of the slip stream NGL line in combination with the external stripping gas line.