A process and an apparatus are disclosed for a compact processing assembly to remove C.sub.5 and heavier hydrocarbon components from a hydrocarbon gas stream. The hydrocarbon gas stream is expanded to lower pressure and supplied to the processing assembly between an absorbing means and a mass transfer means. A distillation vapor stream is collected from the upper region of the absorbing means and cooled in a first heat and mass transfer means inside the processing assembly to partially condense it, forming a residual vapor stream and a condensed stream. The condensed stream is supplied to the absorbing means at its top feed point. A distillation liquid stream is collected from the lower region of the mass transfer means and directed into a second heat and mass transfer means inside the processing assembly to heat it and strip out its volatile components.

A process and an apparatus are disclosed for a compact processing assembly to remove C.sub.5 and heavier hydrocarbon components from a hydrocarbon gas stream. The hydrocarbon gas stream is expanded to lower pressure and supplied to the processing assembly between an absorbing means and a mass transfer means. A distillation vapor stream is collected from the upper region of the absorbing means and cooled in a first heat and mass transfer means inside the processing assembly to partially condense it, forming a residual vapor stream and a condensed stream. The condensed stream is supplied to the absorbing means at its top feed point. A distillation liquid stream is collected from the lower region of the mass transfer means and directed into a second heat and mass transfer means inside the processing assembly to heat it and strip out its volatile components.

A system and methods for processing a feed gas in a column are provided herein. A method includes feeding a feed gas into a port of a sleeve disposed around at least a portion of a periphery of the column. The sleeve includes a space between an outer wall of the column and an inner wall of the column. The sleeve releases the feed gas into the column through an opening disposed at an opposite end of the sleeve from the port.

A system and methods for processing a feed gas in a column are provided herein. A method includes feeding a feed gas into a port of a sleeve disposed around at least a portion of a periphery of the column. The sleeve includes a space between an outer wall of the column and an inner wall of the column. The sleeve releases the feed gas into the column through an opening disposed at an opposite end of the sleeve from the port.

Systems and methods are provided for the fractionation of lubricant feeds. A lubricant feed can be introduced into a vacuum distillation tower having a reduced pressure and a reduced or minimized water vapor partial pressure. The lubricant feed can be separated into a plurality of lubricant boiling range products. The can allow an overlap in boiling ranges of one or more products separated from the lubricant feed to be reduced or minimized.

Systems and methods are provided for the fractionation of lubricant feeds. A lubricant feed can be introduced into a vacuum distillation tower having a reduced pressure and a reduced or minimized water vapor partial pressure. The lubricant feed can be separated into a plurality of lubricant boiling range products. The can allow an overlap in boiling ranges of one or more products separated from the lubricant feed to be reduced or minimized.

An emergency distillation column is disclosed, connected to a plant wherein a main distillation column is present. Such connection occurs by means of by-pass of the pipes which supply said main column, which by-pass has stopping means of the liquid which allow the supply of said emergency column when the pressure drops downstream of the main column exceed a preset threshold value. Preferably, said stopping means are shut-off valves. A process of using the emergency is involves continuously measuring a pressure different between inflow and outflow of liquid being distilled and comparing the measured pressure against a dedicated threshold. A plant for the regeneration of waste oils is disclosed, comprising a distillation column, which furthermore comprises the emergency distillation column as disclosed herein.

An emergency distillation column is disclosed, connected to a plant wherein a main distillation column is present. Such connection occurs by means of by-pass of the pipes which supply said main column, which by-pass has stopping means of the liquid which allow the supply of said emergency column when the pressure drops downstream of the main column exceed a preset threshold value. Preferably, said stopping means are shut-off valves. A process of using the emergency is involves continuously measuring a pressure different between inflow and outflow of liquid being distilled and comparing the measured pressure against a dedicated threshold. A plant for the regeneration of waste oils is disclosed, comprising a distillation column, which furthermore comprises the emergency distillation column as disclosed herein.

A distillation system including a retort and a distillation column. The retort includes an inlet end, an outlet end opposite the inlet end and including an outlet opening, a rotatable drum configured to heat a product therein and move the product between the inlet end and the outlet end. The distillation column is coupled to the outlet end of the retort and configured to receive the product therein upon exiting the outlet opening of the retort. The distillation column includes a solid particle trap section positioned above the outlet opening, a packing section positioned above the solid particle trap section and including screen at a bottom end thereof, a dust filter therein, and a first bubble tray section positioned above the packing section and including a first outlet feed for outflow of a first fluid product.

The present disclosure relates to a corrosion resistant duplex stainless steel (ferritic austenitic alloy), which is suitable for use in a plant for the production of urea and uses thereof. The disclosure also relates to objects made of the duplex stainless steel. Furthermore, the present disclosure relates to a method for the production of urea and to a plant for the production of urea having one or more parts made from the duplex stainless steel, and to a method of modifying an existing plant for the production of urea.