Base for a mass transfer column

Patent metadata

Field	Value
Publication number	US-9427678-B2
Application number	US-201214356257-A
Country	US
Kind code	B2
Filing date	Nov 14, 2012
Priority date	Nov 14, 2011
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

The invention relates to a tray for a mass transfer column, having gas passage openings distributed over the tray ( 1 ), and having at least one baffle ( 11 ) for flow diversion of liquid flowing on the tray, it being possible for the tray ( 1 ) to be fed with a liquid via at least one entry ( 3 ). The tray has at least one entry ( 3 ), at least one separating weir ( 5 ), which separates the inflowing liquid into two streams, and at least two exits ( 12 ), or has at least two entries ( 3 ) and at least one exit ( 12 ) for the liquid, each stream flowing along a flow path ( 7; 9 ) to an exit ( 12 ). The invention further relates to a mass transfer column comprising the tray, and to a use of tray and mass transfer column.

First claim

The invention claimed is:

1. A tray for an absorption column for preparing nitric acid, having gas passage openings distributed over the tray ( 1 ), and having at least one baffle ( 11 ) for flow diversion of liquid flowing on the tray, it being possible for the tray ( 1 ) to be fed with a liquid via at least one entry ( 3 ), and wherein heat transfer elements ( 13 ) are disposed on the tray ( 1 ) along the flow paths ( 7 ; 9 ) in each case, the heat transfer elements being designed as cooling elements, wherein the tray has at least one entry ( 3 ), at least one separating weir ( 5 ), which separates the inflowing liquid into two streams, and at least two exits ( 12 ), or has at least two entries ( 3 ) and at least one exit ( 12 ) for the liquid, each stream flowing along a flow path ( 7 ; 9 ) to an exit ( 12 ).

2. The tray according to claim 1 , wherein the flow paths ( 7 ; 9 ) are designed so that the length of each flow path ( 7 ; 9 ) is substantially the same.

3. The tray according to claim 1 , wherein baffles ( 11 ) are disposed on the tray ( 1 ) for flow diversion, so that meandering flow paths ( 7 ; 9 ) are formed by the baffles ( 11 ).

4. The tray according to claim 1 , wherein the separating weir ( 5 ) forms two flow paths ( 7 ; 9 ) on the tray ( 1 ) which are symmetrical to one another.

5. The tray according to claim 1 , wherein the gas passage openings are sieve holes, bubblecaps, tunnel caps, fixed valves or moving valves.

6. The tray according to claim 1 , wherein the heat transfer elements ( 13 ) are pipelines through which a temperature control medium flows.

7. The tray according to claim 6 , wherein the pipelines extend parallel to the flow path ( 7 ; 9 ).

8. The tray according to claim 6 , wherein 4 to 20 pipelines disposed parallel to one another form one layer in each flow path ( 7 ; 9 ), and 1 to 4 layers are disposed one above another.

9. The tray according to claim 1 , wherein the entry ( 3 ) comprises an entry weir ( 19 ) via which the liquid flows into the respective flow paths ( 7 ; 9 ).

10. A mass transfer column for intense contact of a gaseous phase with a liquid phase for preparing nitric acid, the liquid phase being added via a liquid distributor at the top of the mass transfer column and the gas phase being added via a gas distributor at the bottom of the mass transfer column, a gas phase being taken off at the top of the mass transfer column and a liquid phase being taken off at the bottom of the mass transfer column, wherein the mass transfer column comprises at least one tray according to claim 1 .

11. The mass transfer column according to claim 10 , comprising at least two trays according to claim 1 , where each tray, always in alternation, has one entry and two exits, and a tray lying directly under it or over it has two entries and one exit, and in each case the at least one exit of one tray forms the entry of an underlying tray.

12. A tray for an absorption column for preparing nitric acid, having gas passage openings distributed over the tray ( 1 ), and having at least one baffle ( 11 ) for flow diversion of liquid flowing on the tray, it being possible for the tray ( 1 ) to be fed with a liquid via at least one entry ( 3 ), and wherein heat transfer elements ( 13 ) are disposed on the tray ( 1 ) along the flow paths ( 7 ; 9 ) in each case, the heat transfer elements being designed as cooling elements, wherein the tray has at least one entry ( 3 ), at least one separating weir ( 5 ), which separates the inflowing liquid into two streams, and at least two exits ( 12 ), or has at least two entries ( 3 ) and at least one exit ( 12 ) for the liquid, each stream flowing along a flow path ( 7 ; 9 ) to an exit ( 12 ), and wherein the entry ( 3 ) comprises a liquid distributor ( 21 ) which is disposed above the tray ( 1 ) and has outlet openings ( 25 ) through which the liquid is distributed uniformly onto the flow paths ( 7 ; 9 ).

13. The tray according to claim 12 , wherein the liquid distributor ( 21 ) comprises a housing ( 23 ) provided with the outflow openings ( 25 ), the housing ( 23 ) accommodating an overflow container ( 29 ) to which the liquid to be distributed is supplied.

Assignees

• Basf Se

Inventors

• Bechtel Marcus
• Friedrich Holger
• Baumann Dieter
• Müller Sascha

Classifications

• B01D3/18

  with horizontal bubble plates · CPC title

• B01D3/22

  with horizontal sieve plates or grids; Construction of sieve plates or grids · CPC title

• B01D3/324 Primary

  Tray constructions · CPC title

• B01D3/166 Primary

  Heating and/or cooling of plates · CPC title

• B01F3/04468

  Operations & Transport · mapped topic