Oil scrubbing column

Patent metadata

Field	Value
Publication number	US-2016339355-A1
Application number	US-201415036172-A
Country	US
Kind code	A1
Filing date	Aug 5, 2014
Priority date	Sep 25, 2013
Publication date	Nov 24, 2016
Grant date	—

Abstract

An oil scrub column having a petroleum spirit section and an oil section where each section has mass transfer trays having a plurality of runoff elements that extend parallel to and at a distance from one another, to form angular profiles. The runoff elements have first and second runoff surfaces that converge to form an edge. Scrubbing media introduced onto the edges of the runoff elements flows off via the runoff surfaces at both sides of the edge. The oil section has a greater number of mass transfer trays than the petroleum spirit section. The petroleum spirit section is shorter than the oil section. The mass transfer trays of the petroleum spirit section may be sieve trays, bubble trays or valve trays.

First claim

1 . An oil scrub column having a shell which is extended along a longitudinal axis and encloses an interior of the column, the interior being subdivided into a petroleum spirit section and into an oil section, which is arranged below the petroleum spirit section along the longitudinal axis and which is separated from the petroleum spirit section in particular by means of a chimney tray, there being arranged in the petroleum spirit section a plurality of first mass transfer trays and in the oil section a plurality of second mass transfer trays, where the oil scrub column is designed to guide a cracking gas stream through the second mass transfer trays of the oil section and subsequently through the first mass transfer trays of the petroleum spirit section, where the oil scrub column is designed to subject the second mass transfer trays in the oil section to a liquid, hydrocarbon-containing second scrubbing medium, in order to separate out an oil fraction from the cracking gas stream, and where the oil scrub column is designed to subject the first mass transfer trays in the petroleum spirit section to a liquid, hydrocarbon-containing first scrubbing medium, in order to separate out a petroleum spirit fraction from the cracking gas stream,
characterized

in that the second mass transfer trays each have a plurality of runoff elements extending parallel to and at a distance from one another, in the form of angular profiles, where the runoff elements each have first and second runoff surfaces, where the two runoff surfaces converge along the longitudinal axis towards the petroleum spirit section and meet, to form an edge extending transversely to the longitudinal axis, so that the second scrubbing medium introduced onto the edges of the runoff elements flows off from the respective runoff element via the runoff surfaces at both sides of the respective edge, and where the number of second mass transfer trays in the oil section is greater than the number of first mass transfer trays in the petroleum spirit section, and where the petroleum spirit section has a shorter length along the longitudinal axis than the oil section, and where the first mass transfer trays are designed as sieve trays, bubble trays or valve trays.

2 . The oil scrub column according to claim 1 , characterized in that the length of the petroleum sprit section is not more than half the length of the oil section.

3 . The oil scrub column according to claim 1 , characterized in that the petroleum spirit section has 6 to 8 first mass transfer trays.

4 . The oil scrub column according to claim 1 , characterized in that the oil section is subdivided into a light oil section and into a heavy oil section, which is arranged below the light oil section along the longitudinal axis, there being arranged in each of these sections a plurality of the second mass transfer trays, where the light oil section is separated from the heavy oil section by means of a second chimney tray, and where the oil scrub column is designed to guide the cracking gas stream through the second mass transfer trays of the heavy oil section and subsequently through the second mass transfer trays of the light oil section, where the oil scrub column is designed to subject the second mass transfer trays in the heavy oil section to a liquid, hydrocarbon-containing third scrubbing medium, in order to separate out a heavy oil fraction from the cracking gas stream, and where the oil scrub column is designed to subject the second mass transfer trays in the light oil section to a liquid, hydrocarbon-containing second scrubbing medium, in order to separate out a light oil fraction from the cracking gas stream.

5 . The oil scrub column according to claim 1 , characterized in that the oil section has 10 to 20 second mass transfer trays.

6 . The oil scrub column according to claim 4 , characterized in that the light oil section has 6 to 12 second mass transfer trays.

7 . The oil scrub column according to claim 4 , characterized in that the heavy oil section has 4 to 8 second mass transfer trays.

8 . The oil scrub column according to claim 4 , characterized in that the oil scrub column has a first liquid distributor, which is arranged in the oil section and which is designed to subject the second mass transfer trays to the second scrubbing medium, where the first liquid distributor is designed to introduce this the second scrubbing medium onto the edges of the runoff elements of an uppermost second mass transfer tray of the oil section, so that the second scrubbing medium flows off from the respective runoff element via the runoff surfaces at both sides of the respective edge, where the first liquid distributor is arranged in the light oil section and the uppermost second mass transfer tray is an uppermost second mass transfer tray of the light oil section, and where a second liquid distributor is arranged in the heavy oil section, where the second liquid distributor is designed to subject the second mass transfer trays of the heavy oil section to a third scrubbing medium, and where the second liquid distributor is designed to introduce this the third scrubbing medium onto the edges of the runoff elements of an uppermost second mass transfer tray of the heavy oil section, so that the third scrubbing medium flows off from the respective runoff element via the runoff surfaces at both sides of the respective edge.

9 . The oil scrub column according to claim 8 , characterized in that the first liquid distributor and the second liquid distributor each have a plurality of cutouts through which the respective scrubbing medium can be introduced onto the edges of the runoff elements of the respective uppermost second mass transfer tray, where the cutouts are each arranged perpendicularly above an edge of an assigned runoff element.

10 . The oil scrub column according to claim 9 , characterized in that the first liquid distributor and the second liquid distributor each have a plurality of final distributor channels which are each extended along said column cross section and also transversely to the runoff elements.

11 . The oil scrub column according to claim 10 , characterized in that the final distributor channels each have a base which is extended transversely to the longitudinal axis, and two side walls starting from said base, where said side walls each have an upper rim, and where the cutouts are designed in the form of vacancies at the two upper rims.

12 . The oil scrub column according to claim 11 , characterized in that the first liquid distributor and the second liquid distributor have at least two preliminary distributor channels, which are parallel to one another, are arranged above the final distributor channels along the longitudinal axis and are intended for feeding the final distributor channels with the respective scrubbing medium, where the preliminary distributor channels are extended along the column cross section, and where the preliminary distributor channels extend transversely to the final distributor channels.

13 . The oil scrub column according to claim 12 , characterized in that the preliminary distributor channels each have a base which is extended transversely to the longitudinal axis, and two side walls starting from said base, where said side walls each have an upper rim, at which cutouts are designed in the form of vacancies via which the respective scrubbing medium can be led into respectively one assigned final distributor channel, where the cutouts of the preliminary distributor channels are arranged in each case perpendicularly above an assigned final distributor channel.

14 . The oil scrub column according to

Assignees

• Linde Ag

Inventors

• Alzner Gerhard
• Matten Christian

Classifications

• B01D3/143 Primary

  by two or more of a fractionation, separation or rectification step · CPC title

• B01D3/324 Primary

  Tray constructions · CPC title

• B01D53/1406

  Multiple stage absorption · CPC title

• B01D53/1487

  Removing organic compounds · CPC title

• B01D3/22

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