The present disclosure provides a control method for a rectification and purification system of electronic-grade chlorine trifluoride. A rectification device of electronic-grade chlorine trifluoride includes a two-stage cryogenic rectification device including a low-boiling column and a high-boiling column. An extraction agent is arranged in the two-stage cryogenic rectification device for further dissociating associated molecules of hydrogen fluoride and chlorine trifluoride to meet the requirements of electronic-grade chlorine trifluoride. The reflux ratio parameter stability of a vapor-liquid (chlorine trifluoride-hydrogen fluoride) phase equilibrium system can be effectively improved by a column plate temperature control method, thus realizing wide dynamic smooth running under various working conditions. The column plate temperature control method can achieve an effective separation of chlorine trifluoride and various impurity components by deep rectification technology, yielding electronic-grade chlorine trifluoride through purification.

Trihalosilane refining device having a divided wall distillation column is disclosed. The trihalosilane refining device can be useful in obtaining high-purity trihalosilane from a feed containing a trihalosilane while consuming a small amount of energy.

A fractionation tray includes a manway unit positioned to cover a manway opening in the fractionation tray. The manway opening is framed by one or more fractionation tray panels having apertures therethrough adjacent to the manway opening. The manway unit includes a first manway panel having: perforations for the passage of fluid; first and second opposing side edges and two opposing end edges; and finger elements extending from the second side edge. The finger elements of the second side edge are received within the apertures adjacent to a first side of the manway opening. The manway unit is configured to open and close by rotation of the finger elements within the apertures.

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 mass transfer column comprising: a shell (12); an open internal region (14) defined by said shell; and a mass transfer assembly (16) positioned in the open internal region (14), the mass transfer assembly (16) comprising: a dividing wall (18) forming first and second sub-regions; one or more zones of mass transfer structures positioned in the first and second sub-regions (22 and 24); and a liquid flow divider (48) positioned above the dividing wall (18) for delivering a volumetric split of liquid to the first and second sub-regions. The liquid flow divider (48) may comprise a moveable weir (68) or a valve (180) in order the change the ratio of liquid flow between the two sub-regions.

A mass transfer assembly has at least one dividing wall, zones of mass transfer structures on opposite sides of the dividing wall, and a vapor flow restrictor that is operable to vary the split of vapor ascending through the zones of mass transfer structures on the opposite sides of the dividing wall.

An air stripper apparatus is disclosed which incorporates a plurality of trays that are removably supported within a cabinet. A plurality of downcomers are also fixedly disposed within the cabinet, rather than on the trays. Removing the downcomer from each tray enables a simpler, lighter and easier to clean tray to be constructed.

Gas/liquid separation column, containing a device for dispensing a liquid, intended for a gas/liquid separation column, comprising: a plate, in which several orifices are arranged, through which the liquid is able to leave the dispensing device; a plurality of stacks extending from the plate, each stack being configured to be followed by the gas; a plurality of plugging means respectively arranged at one end of one of the stacks, each plugging means having a gutter shape allowing a first portion of the liquid to be collected; a plurality of troughs for directly collecting a second portion of the liquid, at least one part of the orifices being distributed in the base of said troughs, each plugging means comprising a first open longitudinal end and a second closed longitudinal end.

The present disclosure describes a fractional distillation tower that uses color sensing technology that provides nearly real time cutpoint analysis of high value products. With this information, the cutpoints may be aggressively shifted to a financially advantageous product slate and stay aggressive throughout each day rather than wait for a once or twice daily report of what products have been made and their analyses with respect to specifications.