Abstract:
The present invention relates to a chimney tray (3) for a column (1) for thermal treatment of fluid mixtures, comprising a collecting tray (4) and at least two chimneys (5-1, 5-2) spaced apart horizontally in the collecting tray (4), where each chimney (5-1, 5-2) forms a vertically aligned chimney body (6-1, 6-2) which forms a passage orifice (7-1, 7-2) through the collecting tray (4), and has a cover unit (8-1, 8-2) arranged spaced apart from the chimney body (6-1, 6-2), and where the cover unit (8-1, 8-2) covers the respective passage orifices (7-1, 7-2) in the vertical direction. The chimney tray (3) of the invention is characterized by a screen (9) which extends around the chimney body (6-1) of a first chimney (5-1), with the lower annular edge (14) of the screen (9) below the upper edge (13) of the chimney body (6-1) of the first chimney (5-1) and the upper annular edge (11) of the screen (9) above the lower outer edge (12) of the cover unit (8-1) of the first chimney (5-1) or adjoining the lower outer edge (12) of the cover unit (8-1) of the first chimney (5-1).
Abstract:
The present invention relates to a column (1) for thermal treatment of fluid mixtures, having a cylindrical, vertical column body (2) which forms a column cavity (3) and a vertical inner surface (16), a plurality of trays (8) mounted in the column cavity (3) and spaced apart vertically from one another, at least one stub (11) disposed within the column body (2) and extending away from the column body (2), and a closable inspection orifice (9) formed in the stub (11). The characteristic feature of the column of the invention is that in the case of a vertical cross section of the column (1) the surface (15) of the lower line of intersection of the stub (11) directed into the column cavity (3) or a tangent to the surface (15) of the lower line of intersection of the stub (11) at least in sections forms an angle within a range from 210° to 267° with the vertical inner surface (16) of the column body (2) which extends downward from the stub (11).
Abstract:
The present invention relates to the process for recovering acrylic acid, comprising the steps a) division of a heated mother acid stream in direction of an absorption column (201) and a dissociation column (205), b) feeding of a heated mother acid substream as runback to the dissociation column (205), c) feeding-in of at least one stripping gas stream to the dissociation column (205), d) feeding-in of a secondary component stream comprising oligomeric acrylic acid from the condensation column (201) to the dissociation column (205), e) dissociation of part of oligomeric acrylic acid in the dissociation column (205) to give monomeric acrylic acid, f) removal of secondary components comprised in the secondary component stream in the dissociation column (205), g) discharge of monomeric acrylic acid as gas mixture with introduced circulating stripping gas stream from the dissociation column (205) and h) feeding-in of the gas mixture to the condensation column (201).
Abstract:
The present invention relates to a column (1) for thermal treatment of fluid mixtures, having a cylindrical, vertical column body (2) which forms a column cavity (3), a plurality of trays (8) mounted with vertical spacing in the column cavity (3), and a support construction (9) which supports at least one of the trays (8) in vertical direction. It is a characteristic feature of the inventive column (1) that the support construction (9) has a plurality of orifices (12) which allow horizontal mass transfer through the support construction (9). The invention further relates to a tray device for such a column and to a thermal separation process between at least one gas ascending within such a column (1) and at least one liquid descending within the column (1).
Abstract:
The present invention relates to a reactor system (1) comprising a reactor 3, at least one cooler (5) connected to the reactor (3), at least one pump (7) for circulating at least some of a liquid heat-transfer medium (9), wherein the pump (7) is connected to the reactor (3) and/or the at least one cooler (5), and a container (11) for collecting the liquid heat-transfer medium (9), wherein the container (11) is connected to the reactor (3) and/or the at least one cooler (5), wherein the container (11) is disposed substantially below the reactor (3) and/or the at least one cooler (5). Moreover, the use of the reactor system (1) according to the invention for carrying out exothermic reactions is described.
Abstract:
A plant (1) for recovering acrylic acid, which includes: a absorption column (201); a dissociation column (205); a first line (101) connected to the dissociation column (205); a second line (102) connecting the absorption column (201) and the dissociation column (205); a third line (103) feeding a substream of the mother acid obtained in the crystallization into the dissociation column (205); a fourth line (104) connecting the crystallization apparatus and the absorption column (201); and a fifth line (105) connecting the dissociation column (205) and the absorption column (201).
Abstract:
The present invention relates to a column (1) for thermal treatment of fluid mixtures, having a cylindrical, vertically aligned column body (2) which forms a column cavity (3), having a sequence of vertically spaced-apart dual-flow mass transfer trays (8) which are mounted in the column cavity (3) and which have orifices for passage of liquid and gas in countercurrent, and having at least one gas entry orifice (5) disposed below the lowermost of the sequence of dual-flow mass transfer trays (8). It is a characteristic feature of the column of the invention that a gas distribution tray (9) which is disposed between the lowermost of the sequence of dual-flow mass transfer trays (8) and the gas entry orifice (5) has orifices (32) for vertical passage of gas which can be introduced into the column cavity (3) via the gas entry orifice (5), the orifices (32) being formed so as to bring about equal gas distribution over the column cross section. The invention further relates to a process for thermal treatment of fluid mixtures in such a column (1).
Abstract:
The present invention relates to a process for treating secondary components obtained in acrolein and/or (meth)acrylic acid production, comprising the steps of: a) contacting at least one wastewater stream (201) comprising at least a portion of the water of reaction removed in a first stage of a saturation column (101) with at least one process offgas stream (203), b) introducing energy by means of a first heat transferer (103) provided in a first saturation circuit (301) into the first stage of the saturation column (101), c) partly vaporizing the wastewater stream (201) into the process offgas stream (203) and passing the combined gas stream (205) into a second stage of the saturation column (101), d) drawing off a concentrated wastewater stream (207) from the bottom (1011) of the first stage of the saturation column (101) and feeding it to the top (1023) of the second stage of the saturation column (101), e) introducing energy by means of a second heat transferer (105) provided in a second circuit (303) into the second stage of the saturation column (101), f) partly vaporizing the concentrated wastewater stream (207) into the combined gas stream (205) to obtain an offgas stream (209), g) superheating the offgas stream (209), after it has been saturated, in a third heat transferer (113) to obtain a superheated offgas stream (211) and h) transferring the offgas stream (209) or the superheated offgas stream (211) from the saturation column (101) to a thermal aftertreatment. The present invention further relates to a plant (1) for treating the secondary components obtained in acrolein and/or (meth)acrylic acid production.
Abstract:
The present invention relates to a column (1) for thermal treatment of a fluid, having a cylindrical, vertical column body (2) which forms a column cavity (3), and a mass transfer tray (4) which is disposed in the column cavity (3) and forms a collecting area (5). The inventive column (1) is characterized by a circulation device (9) having at least one drain orifice (10) formed in the column body (2) above the collecting area (5), a circulation line (11) in fluid connection with the drain orifice (10) and at least one recycling orifice (14; 14-1 to 14-3) which is in fluid connection with the circulation line (11) and is formed in the column body (2) above the collecting area (5). The invention also relates to a thermal separating process in which such a column (1) is used. In this separating process, a gas ascends within the column and a liquid descends within the column, said gas and/or liquid especially comprising (meth)acrylic monomers.
Abstract:
The present invention relates to a system (1) for operating a liquid gas evaporator (3), comprising an evaporator (3) for evaporating a liquid gas into its gaseous aggregation state, a trough (5) carrying the evaporator (3), a housing (7) which surrounds the evaporator (3) on three sides and which terminates flush with the trough (5), at least one detector (9) which is sensitive to the liquid gas and its gaseous aggregation state and which is arranged in the trough (5), a line (11) for the distribution of vapor D, which is provided on the fourth, non-housed side of the evaporator (3) and which is arranged at that margin of the trough (5) which is not closed off by the housing (7), a feed (13), connected to the line (11), for the vapor D, and a regulating valve (15) provided on the feed (13) and connected to the detector (9) and at least one shut-off valve (17). The present invention relates furthermore, to a method for operating a liquid gas evaporator (3).