The present disclosure discloses a multi-bubbling region column tray and a corresponding plate column. The multi-bubbling region column tray includes: at least two bubbling regions, provided with first openings for liquid and gas to be mixed and in contact with each other; and at least one non-side downcomer, including at least one hanging downcomer, where the hanging downcomer has a bottom part which includes one or more second openings allowing the liquid to flow toward a lower left side, and one or more third openings allowing the liquid to flow toward a lower right side; and the bottom part of the hanging downcomer is designed to separate the liquid flowing out from the one or more second openings and the liquid flowing out from the one or more third openings.

The present disclosure discloses a multi-bubbling region column tray and a corresponding plate column. The multi-bubbling region column tray includes: at least two bubbling regions, provided with first openings for liquid and gas to be mixed and in contact with each other; and at least one non-side downcomer, including at least one hanging downcomer, where the hanging downcomer has a bottom part which includes one or more second openings allowing the liquid to flow toward a lower left side, and one or more third openings allowing the liquid to flow toward a lower right side; and the bottom part of the hanging downcomer is designed to separate the liquid flowing out from the one or more second openings and the liquid flowing out from the one or more third openings.

A tray assembly for improved gas/liquid contact in a chemical process tower includes a tray deck and a downcomer. A mixer is provided in the top of the downcomer and a distributor is attached to a floor of the downcomer. The mixer includes at least one mixing baffle parallel to an outlet weir on the tray. The distributor includes a plurality of spaced apart flow directing plates extending downwardly toward and spaced apart from the floor of the downcomer. In combination, the mixer and distributor effect even liquid flow across the surface of a subjacent tray deck.

A fluid contact tray (10) for a fractionation column (1), in particular a vapor-liquid contact tray suitable for the use in an offshore fractionation column, comprises: •a tray deck (12) comprising an active mass transfer surface (20) suitable for contacting two fluids (l, g) of different densities, wherein the active mass transfer surface (20) comprises one or more orifices (18) for the passage of a fluid/gas (g), and wherein at least two at least partially radially extending separation walls (22-1, 22-2, 22-3, 22-4) and/or at least one separation weir (42) are arranged on the active mass transfer surface (20), which divides the active mass transfer surface (20) into at least two sections (24-1, 24-2, 24-3, 24-4), •an annular channel (26) suitable for collecting fluids/liquids (l), which is arranged at the peripheral area of the active mass transfer surface (20) and at least partially embraces the mass transfer surface (20), •a central downcomer (34) for collecting and discharging a fluid/liquid (l) from the annular channel (26), wherein the central downcomer (34) has the form of a hollow body with an opening (36) in the bottom section thereof being suitable for the distribution of liquid vertically downwardly, and wherein the central downcomer (34) is non-rotatably fixed at the fluid contact tray (10), and •at least one conducting means (40) for transferring fluid collected in the annular channel (26) from the annular channel (26) to the central downcomer (34). This fluid contact tray (10) is in particular useable for offshore applications, such as for a fractionation column located on a FLNG or FPSO vessel.

A multi-pass contact tray for use in a mass transfer column has a mixture of fixed valves to movable valves, with the numbers of the respective valves being selected to balance the volumetric flow of vapor through deck segments when the vapor is ascending at volumetric flow rates insufficient to maintain the movable valves in an open position.

Multiple downcomer trays having increased active area for vapor-liquid contact and separation are described. The increased active area of the tray is achieved by adding raised bubble promoters surrounded by perforated vertical contactors on the tray deck. The bubble promoters and surrounding vertical contactors are located under the downcomers from the tray above. The bubble promoter and surrounding vertical contactor promote uniform fluid flow and contact.

Multiple downcomer trays having increased active area for vapor-liquid contact and separation are described. The increased active area of the tray is achieved by adding raised bubble promoters surrounded by perforated vertical contactors on the tray deck. The bubble promoters and surrounding vertical contactors are located under the downcomers from the tray above. The bubble promoter and surrounding vertical contactor promote uniform fluid flow and contact.

The present invention relates to a distributor tray (1) comprising chimneys (2) for the passage of gas and means for the passage of liquid. The distributor tray furthermore has at least one casing (10) for distributing the gas. The casing (10) is arranged around a plurality of chimneys (2), and has gas remixing means and gas redistribution means.

A process for thermal cracking of a feedstock of plastic materials, in particular waste materials, includes the steps of melting the feedstock, conveying melted feedstock in a pyrolysis chamber where the melted feedstock is heated in a substantially oxygen purged environment, to convert it into pyrolysis gases, the process further comprising the steps of: driving pyrolysis gases from the pyrolysis chamber into a tray reflux column comprising a partial condenser at its upper extremity, returning pyrolysis gases condensed in the tray reflux column into the pyrolysis chamber, distilling pyrolysis gases exiting the partial condenser of the reflux column, to provide one or more fuel products.

A multiple pass, parallel flow downcomer tray for a mass transfer column and method for liquid-vapor contacting in a mass transfer column is provided. The multiple pass, parallel flow downcomer tray has at least four mass transfer decks configured to provide contact between an ascending vapor passing upward through apertures on the tray surface and a traversing liquid on the tray surface. The tray further includes a central downcomers disposed near a central axis of the tray and two or more peripheral downcomers disposed near the edge of the tray and spaced apart from the central axis, wherein at least two of the four mass transfer decks are configured to discharge the traversing liquid into the peripheral downcomers and two of the four mass transfer decks are configured to discharge the traversing liquid into the central downcomer.