An extractive distillation column system contains a combination column and a side rectification column. A process can be used for separation of butenes from C4-hydrocarbon streams using the extractive distillation column system.

This disclosure describes energy efficient process to distill a process stream in a production facility. A process uses multiple effect evaporators, ranging from one evaporator to eight evaporators in each effect. The process arrangement shows an example of four effect evaporators, with a zero-effect evaporator having a single evaporator, a first-effect evaporator having a set of three evaporators, a second-effect evaporator having a set of three evaporators, and a third-effect evaporator having a set of evaporators to create condensed distillers solubles.

A method for purification of a styrene-containing feedstock includes steps of introducing the styrene-containing feedstock into the middle of an extractive distillation column, and a solvent for the extractive distillation into the upper part of the column; discharging a raffinate oil from the top of the column, and a rich solvent rich in styrene from the bottom of the column. The rich solvent is then introduced into the middle of the solvent recovery column for vacuum distillation to obtain a crude styrene from the top of the solvent recovery column, and a lean solvent is discharged from the bottom of the solvent recovery column and recycled to the upper part of the extractive distillation column. A portion of the rich solvent is sent to a solvent purification zone for a liquid-liquid extraction using water to obtain a mixture of a styrene polymer and styrene.

The present disclosure relates to isolating one or more cannabinoids from an input mixture. There is disclosed an apparatus that comprises a mixing vessel, a volatizing unit, and a distillation unit. The mixing vessel combines a first input mixture and a high boiling-point carrier agent to generate a second input mixture. The volatizing unit volatilizes cannabinoids from the second input mixture for separating the mixture into a cannabinoid-containing vapor stream and a residue. The distillation unit receives the cannabinoid-containing vapor stream and separates a first cannabinoid from at least a second cannabinoid. There are also disclosed methods that comprise the steps of combining a first input mixture with a high boiling-point carrier agent to provide a second input mixture, volatilizing the second input mixture into a vapor stream containing one or more cannabinoids and a residue, and separating a first cannabinoid from a second in the distillation unit.

A process and apparatus reboil a propylene splitter bottoms by heat exchange and/or a deethanizer bottoms stream with a compressed propylene splitter overhead stream. Use of single splitter compressor and operation of the propane-propylene splitter column at lower pressure are enabled, whereas conventionally two splitter compressors and higher splitter pressure were necessary to provide a propylene product stream and a propane recycle stream of equivalent quality.

A hybrid mint plant characterized by an essential oil composition profile, methods of cultivating the hybrid mint plant, and methods of producing an essential oil composition with the essential oil composition profile using the hybrid mint plant are disclosed.

A process for the production of ultralow aromatic specialty distillate from different refinery streams particularly high sulfur streams. The process produces de-aromatized distillates with benzene content below 1 ppmw. Hydrocarbon feedstock having boiling temperature in the range of 90 and 350° C., preferably 140 and 320° C. The hydrocarbon feedstocks are obtained from any petroleum-refinery or bio-refinery or any other source producing hydrocarbon streams.

The present invention relates to a process for treating a feedstock containing tall oil, the process including separation of a light stream from the feedstock, followed by removal of a heavy fraction from the feedstock , in which process the separation of the light stream from the feedstock a fractionator is used and at least one product is collected from the light stream . The invention also relates to an apparatus for use in the process and use of a fractionator in dehydration of a feedstock containing tall oil.

Systems and methods are provided for co-processing of pyrolysis tar with pre-pyrolysis flash bottoms. In some aspects, the co-processing can correspond to solvent-assisted hydroprocessing. By combining pyrolysis tar and flash bottoms with a solvent, various difficulties associated with hydroprocessing of the fractions can be reduced or minimized, such as difficulties associated with hydroprocessing of high viscosity feeds and/or high sulfur feeds. Optionally, separate solvents and/or fluxes can be used for the pyrolysis tar and the flash bottoms. The resulting upgraded products can be suitable, for example, for inclusion in low sulfur fuel oils (LSFO).

Disclosed is a process for vacuum distillation of a hydrocarbon stream comprising i) passing a hydrocarbon stream into a preflash vessel maintained under conditions to separate the hydrocarbon stream into a preflash liquid and a preflash vapor, ii) passing the preflash liquid into a vacuum furnace maintained under conditions to heat and partly vaporize the preflash liquid, iii) passing the heated furnace effluent into a zone located in the lower part of a vacuum distillation column maintained under fractionating conditions, and iv) passing the preflash vapor into the vacuum distillation column into a further zone located in the lower part of the vacuum distillation column.