EP2144680A1 - Colonne comportant des fonds à courants croisés et des distributeurs de liquide - Google Patents

Colonne comportant des fonds à courants croisés et des distributeurs de liquide

Info

Publication number
EP2144680A1
EP2144680A1 EP08749645A EP08749645A EP2144680A1 EP 2144680 A1 EP2144680 A1 EP 2144680A1 EP 08749645 A EP08749645 A EP 08749645A EP 08749645 A EP08749645 A EP 08749645A EP 2144680 A1 EP2144680 A1 EP 2144680A1
Authority
EP
European Patent Office
Prior art keywords
liquid
heat transfer
column
transfer elements
box
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP08749645A
Other languages
German (de)
English (en)
Inventor
Thorsten Friese
Marcus Bechtel
Heinz-Josef Kneuper
Helmut Jansen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to EP08749645A priority Critical patent/EP2144680A1/fr
Publication of EP2144680A1 publication Critical patent/EP2144680A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B01D3/16—Fractionating columns in which vapour bubbles through liquid
    • B01D3/166—Heating and/or cooling of plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/008—Liquid distribution

Definitions

  • the present invention relates to a column for working up mixtures of substances by intensive contact of a liquid and gaseous phase, wherein the column has one or more transverse flow trays with heat transfer elements mounted thereon in the interior.
  • Columns such as distillation columns, absorption columns or stripping columns are multi-stage separation apparatuses in which a separation of substances takes place by intensive contact of liquid and gaseous phase.
  • the liquid phase passes from top to bottom through the column, the gas phase rises from bottom to top through the column.
  • both phases are brought into contact and thus achieved the cleaning effect.
  • Internals are usually random bulk fillers, ordered packs or trays.
  • Floors are often designed as cross flow trays.
  • the liquid is supplied on one side to the bottom, passes over the bottom and is there brought into contact with the gas rising through mass transfer gas and finally reaches a downcomer, in which the liquid is collected and fed to the underlying soil becomes.
  • the fumigated area with the mass transfer elements is the "active area.” Separation of entrained gas takes place in the inflow and outflow shaft, and the downcomers serve as a guide for degassed liquid from one floor to the floor below.
  • Mass transfer elements in crossflow trays may e.g. Sieve holes, fixed valves, movable valves, bells or tunnels.
  • Sieve holes e.g. Sieve holes, fixed valves, movable valves, bells or tunnels.
  • process conditions such as permissible temperatures or pressures - the appropriate mass transfer elements are selected by the expert.
  • Sieve trays and valve trays are usually not hydraulically sealed
  • heat transfer elements attached to the cross flow trays can be provided, for example as cooling coils or heating coils.
  • a possible supply of liquid to such cross-flow trays is carried out by overflowing the liquid via a feeder weir with a height of usually between 5 and 150 mm. The liquid can also be fed to the ground without a feeder.
  • a column for working up mixtures by intensive contact of a liquid and gaseous phase wherein the column has one or more crossflow trays in the interior, are mounted on soft heat transfer elements, which are traversed by a heat transfer medium and wherein one or more of these crossflow trays liquid distributor are arranged, which have outflow openings through which the liquid is evenly distributed over the heat transfer elements below the liquid distributor and wherein the liquid distributor are arranged above the heat transfer elements in the column so that it is in the vicinity of the supply or discharge of the heat transfer medium in the heat transfer elements.
  • a new feed system has been developed, via which the liquid is supplied to the cross-flow wells provided with heat transfer elements.
  • the liquid is not supplied, as for example via a feed weir, but via a container - referred to below as a "box" - which functions as a liquid distributor with outlet openings.
  • Outside, preferably bored, punched or lasered openings can be used as outflow openings Openings may be provided at the bottom of the box, as side openings, as holes in tubes or as overflow tubes
  • the outflow openings may be provided in any arrangement, preferably in one or more rows or triangular or quadrilateral divisions Box arranged above the coils, so that the liquid is supplied evenly from above and does not flow as usual side laterally between the coils.
  • a rainfall and the associated separation performance degradation by bypassing the liquid on the next floor can be effectively reduced.
  • the heat transfer elements can be operated both in the direct current and in the countercurrent with respect to the liquid on the crossflow mode. It is particularly advisable to arrange the liquid distributor according to the invention in the case of the direct current in the vicinity of the feed line of the heat transfer medium in the heat transfer elements. In the case of the countercurrent, an arrangement of the liquid distributor in the vicinity of the discharge of the heat transfer medium from the heat transfer element is particularly recommended.
  • Coils are often used for cooling or heating on the crossflow trays.
  • a tube coil layer has 1 to 30, preferably 5 to 25; more preferably 8 to 16, preferably parallel tubes.
  • the coils are usually mounted with the largest possible path over the floor.
  • meander-shaped, parallel, circular and other variants of current paths can be specified by means of baffles.
  • pipe coils are also heat exchanger plates, oval tubes and rectangular profile tubes.
  • cross flow plates are understood to be trays in columns for working up mixtures of substances by intensive contact of a liquid and gaseous phase.
  • the liquid is supplied on one side to the ground, passes over the bottom and is there brought into contact with the rising through mass transfer gas gas and finally reaches a downcomer, in which the liquid is collected and fed to the underlying soil.
  • the fumigated area with the mass transfer elements is the "active area.” Separation of entrained gas takes place in the inflow and outflow shaft, and the downcomers serve as a guide for degassed liquid from one floor to the floor below It can also be used for bells or tunnel floors, as they are mostly, but not necessarily, hydraulically sealed.
  • the design of the box should be such that the box is placed in the column so that it is positioned above (outside) the bubble layer during operation.
  • all coiled tubing layers are usually completely submerged in the bubble layer.
  • the lower edge of the box is in this case preferably at a distance of 1 to 50 cm, preferably 5 to 30 cm; more preferably 10 to 15 cm above the uppermost point of the tube coil position.
  • the height of the box can preferably be kept adjustable by threaded rods in order to adapt to changing requirements in a simple manner.
  • FIG. 1 shows two sections through a column with column wall (1) and sieve bottom (2).
  • the liquid to be distributed Via a downcomer (3), the liquid to be distributed is directed into the inner box (4), the downcomer being arranged so that it dips into the liquid in the inner box, thus preventing upward flow of gas through the downcomer ,
  • the liquid flows through the inner box into the outer box (5).
  • the coils are completely within the bubble layer as shown by line (8).
  • a guide plate (9) can be seen, whereby the path of the cooling tubes is specified.
  • At the bottom of the box are in 1 to 30 rows, preferably 2 to 20 rows; more preferably 3 to 7 rows of 10 to 50, preferably 20 to 40 holes per row attached. These rows are preferably oriented parallel to the outer edges of the box at an angle of preferably 30 ° to 90 ° over the longitudinal direction of the tubes.
  • the aim of this solution is to distribute the liquid as evenly as possible over all parallel pipes in the flow direction.
  • the holes have a hole diameter of 1 to 30 mm, preferably 5 to 20 mm; particularly preferred 7 to 12 mm.
  • the unbegaste liquid level around the tubes is between 15 to 300 mm, preferably 25 to 250 mm; more preferably 50 to 150 mm.
  • the box In order to ensure a particularly uniform liquid distribution, the box should have a low deflection ⁇ 2 mm at the bottom and a flatness of the level gradient less than 1 mm / 1 m. If necessary, a deflection can be counteracted here by the skilled person by selection of appropriate materials or structural measures for stiffening.
  • the inner and outer boxes preferably have a row of overflow serrations (10) with a height of 2 to 60 mm, preferably 5 to 40 mm, at the upper edge in the flow direction and at the opposite side thereof; more preferably 10 to 30 mm in order to achieve a uniform distribution of the liquid over the tubes in overflow of the box.
  • the overflow spikes are to be used preferentially with polluting systems, in order to secure the function of the box also with blocked up holes.
  • the longest extent of the box can preferably be oriented at an angle of 30 ° to 90 ° over the longitudinal direction of the coils.
  • the aim of the use box is the uniform task of the liquid above the coils in the inlet area (furthest point to drain the soil).
  • the box should be designed in such a way that it flows around the coil in an effective manner (with a long running length).
  • the embodiment of the invention is suitable for different applications in distillation columns, absorption columns and stripping columns. It is generally suitable in particular for use in processes in which heat is to be added or removed in a column during the work-up of a substance mixture.
  • it is used in an absorption column for the production of nitric acid.
  • heat of absorption is produced which must be drawn off by cooling coils mounted on the transverse flow trays.
  • ammonia is catalytically burned with air on platinum nets.
  • the liquid addition may be via an external feed addition and or via an internal liquid stream via e.g. a downcomer or an annular channel, o.a. respectively.
  • the liquid enters the inner box via a feed tube of e.g. outside the column and / or via the downcomer of the overlying floor or a pipe from an annular channel.
  • This downcomer or the pipe from the annular channel must be sealed gas-tight to prevent a bypass flow of the gas through the shaft.
  • a second inner box is installed in the first outer box.
  • the downcomer dips below the liquid level.
  • This downcomer is between 10 to 200 mm, preferably 20 to 100 mm; more preferably 30 to 50 mm submerge.
  • the fluid level in the inner box is determined by its height. This ensures that the drain hole is sealed regardless of the liquid level of the outer box.
  • the height distance of the inner to the outer box should be 10 to 250 mm, preferably 20 to 150 mm; more preferably 50 to 100 mm.
  • the inner box has at the upper edges a series of overflow peaks with a height of 2 to 20 mm, preferably 10 to 15 mm, in order to achieve a uniform distribution of the liquid in the outer box.
  • the box should preferably at the farthest point of the liquid withdrawal distribute the liquid as evenly as possible over the coils at their supply or discharge of the heat transfer medium.
  • the geometry of the box is adapted to the geometry of the coils to make efficient use of the available area.
  • the width of the box depends on the liquid load and the length of the box on the number of coils.
  • the inner box is determined by the size of the supply line.
  • the device of the invention provides in procedural simpler way the ability to fumigate provided with heat transfer elements crossflow trays in a uniform manner, with an undesirable rain can be effectively avoided.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

La présente invention concerne une colonne permettant de traiter des mélanges de matières par mise en contact intensif d'une phase liquide et gazeuse. La colonne présente à l'intérieur un ou plusieurs fonds à courants croisés sur lesquels sont appliqués des éléments de transfert thermique (7) qui sont traversés par un milieu caloporteur. Des distributeurs de liquide (4, 5) se trouvent sur un ou plusieurs de ces fonds à courants croisés, lesquels distributeurs présentent des ouvertures d'écoulement (6) qui permettent de répartir uniformément le liquide à travers les éléments de transfert thermique (7) sous les distributeurs de liquide (4, 5). Les distributeurs de liquide (4, 5) sont placés au-dessus des éléments de transfert thermique (7) dans la colonne de manière à se trouver à proximité de la conduite d'admission ou d'évacuation du milieu caloporteur dans les éléments de transfert thermique (7).
EP08749645A 2007-04-27 2008-04-22 Colonne comportant des fonds à courants croisés et des distributeurs de liquide Ceased EP2144680A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08749645A EP2144680A1 (fr) 2007-04-27 2008-04-22 Colonne comportant des fonds à courants croisés et des distributeurs de liquide

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07107101 2007-04-27
EP08749645A EP2144680A1 (fr) 2007-04-27 2008-04-22 Colonne comportant des fonds à courants croisés et des distributeurs de liquide
PCT/EP2008/054855 WO2008132096A1 (fr) 2007-04-27 2008-04-22 Colonne comportant des fonds à courants croisés et des distributeurs de liquide

Publications (1)

Publication Number Publication Date
EP2144680A1 true EP2144680A1 (fr) 2010-01-20

Family

ID=39737079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08749645A Ceased EP2144680A1 (fr) 2007-04-27 2008-04-22 Colonne comportant des fonds à courants croisés et des distributeurs de liquide

Country Status (2)

Country Link
EP (1) EP2144680A1 (fr)
WO (1) WO2008132096A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9427678B2 (en) 2011-11-14 2016-08-30 Basf Se Base for a mass transfer column

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE299804C (fr) * 1913-11-02 1917-08-01
FR956852A (fr) * 1948-06-19 1950-02-09
IT1148829B (it) * 1980-05-16 1986-12-03 Snam Progetti Dispositivo per la distribuzione di liquido sotto forma di film in apparecchiature verticali di scambio termico
DE19729514C1 (de) * 1997-07-10 1998-11-19 Balcke Duerr Gmbh Dampfbeheizte Vorrichtung zur Verdampfung oder Eindickung von Flüssigkeiten
FR2807505B1 (fr) * 2000-04-07 2002-06-14 Air Liquide Distributeur liquide-gaz pour colonne d'echange de matiere et/ou de chaleur, et colonne utilisant un tel distributeur
US20040104108A1 (en) * 2002-12-03 2004-06-03 Mason Robert Michael High capacity purification of thermally unstable compounds

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2008132096A1 *

Also Published As

Publication number Publication date
WO2008132096A1 (fr) 2008-11-06

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