The present invention relates to a distributor tray (1) comprising chimneys (2) for the passage of gas, and means for the passage of liquid. The distributor plate additionally comprises at least one compartment (10) for distributing gas. Said compartment (10) is arranged around a plurality of chimneys (2), and comprises means for back-mixing the gas and means for redistributing the gas.
The present invention relates to an exchange column (CO) for the exchange of matter and, as required, heat, between a gas and a liquid. The exchange column (CO) comprises at least one collector tray and a liquid distribution system arranged between two packing beds (7), and means for recirculating the liquid (8). The means for recirculating the liquid (8) connect an area situated beneath the packing bed (7) to an area situated above the distributor tray.
The present invention relates to a column (1) for the exchange of heat and/or matter between a gas and a liquid. The column comprises at least one contactor provided with at least two layers of a first packing (2), and provided with at least one layer of a second packing (3) arranged between the two layers of the first packing (2). The layer of the second packing (3) comprises means (4, 5, 6) of restricting the passage of the fluids.
B01D 3/00 - Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
B01D 3/26 - Fractionating columns in which vapour and liquid flow pass each other, or in which the fluid is sprayed into the vapour, or in which a two-phase mixture is passed in one direction
B01D 3/28 - Fractionating columns with surface contact and vertical guides, e.g. film action
4.
EXTERNAL GAS MIXING PIPE FOR LIQUID-GAS CONTACTING UNIT
The present invention relates to a liquid-gas contacting unit (1) comprising a column (100), at least a lower packed bed (110) and a higher packed bed (120) positioned higher than the lower packed bed (110) inside the column (100), a gas-tight liquid collecting and redistributing device (130) disposed between the lower and the higher packed bed (110; 120) inside the column (100) and an external pipe (140) outside the column (100), the external pipe (140) comprising an inlet end (141), an outlet end (142) and a peripheral wall (143) between the inlet end (141) and the outlet end (142); the inlet end (141) being positioned between the lower packed bed (110) and the gas-tight liquid collecting and redistributing device (130) and the outlet end (142) being positioned between the higher packed bed (120) and the gas-tight liquid collecting and redistributing device (130). The present invention also relates to a method for improving the efficiency of a liquid-gas contacting unit by directing the gas from the lower packed bed to the higher packed bed through the external pipe.
The present invention relates to a column for heat and/or mass exchange between a gas and a liquid. The column comprises at least one collection tray (1), at least one packed bed, and means for mixing a gas flow (7, 8). According to the invention, the means for mixing a gas flow are positioned underneath the collection tray (1) and above the packing.
The present invention relates to a column for exchange of mass, and where appropriate heat, between a gas and a liquid. The column comprises at least one collection tray and a liquid distribution system (5, 6) arranged between two packed beds (7), and gas and liquid separation means (8). The present invention proposes to arrange gas and liquid separation means (8) between the collection tray (4) and the liquid distribution means (5, 6).
The present invention relates to a gas-redirecting device (100) presenting an upper plane and a plurality of gas-redirecting tubes (3) comprising an inlet end and an outlet end. For each gas-redirecting tube, the orthogonal projections of the inlet end and the outlet end onto the upper plane have an over-lapping area of at most 50 % of the total area of the upper plane covered by the orthogonal projections. The present invention also relates to a liquid-gas contacting column (201) comprising such a gas-redirecting device (100), a floating support comprising such a liquid-gas contacting column, at least two packed beds (210, 220) and a method for improving the efficiency of a liquid-gas contacting column which is based on redirecting the gas from a wetted zone of a lower packed bed to a wetted zone of the higher packed bed, the liquid load through the wetted zone of the lower packed bed is different from the liquid load through the wetted zone of the higher packed bed.
B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
B01D 3/20 - Bubble capsRisers for vapourDischarge pipes for liquid
B01J 8/04 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with stationary particles, e.g. in fixed beds the fluid passing successively through two or more beds
8.
REMOVAL OF AROMATIC HYDROCARBONS FROM LEAN ACID GAS FEED FOR SULFUR RECOVERY
The present invention is directed to a process for the removal of aromatic hydrocarbons from a lean acid gas containing less than 20 mol.% of H2S, comprising : a) contacting the lean acid gas stream (1) with a H2S-selective liquid absorbent solution (29) in a first absorption zone (2) to produce a gas stream depleted in H2S (3) and an absorbent solution enriched in H2S (4), b) introducing the absorbent solution (4) into a non-thermic stripping zone (8) where it is contacted with a stripping gas stream (7) to obtain an absorbent solution depleted in C4+ aliphatic and aromatic hydrocarbons (9) and a stripping gas stream enriched in aromatic and C4+ aliphatic hydrocarbons (10), c) contacting the stripping gas stream (10)obtained in step b) with a H2S-selective liquid absorbent solution (28) in a second absorption zone (12) to obtain a stripping gas stream depleted in H2S (13), and an absorbent solution enriched in H2S (14) d) introducing the absorbent solution (9) obtained in step b) into a desorption zone (16) wherein the H2S-selective liquid absorbent solution (17) is recovered and a lean acid gas is produced.
B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
C10L 3/10 - Working-up natural gas or synthetic natural gas
9.
PROCESS FOR REMOVING SULFUR COMPOUNDS FROM A GAS WITH HYDROGENATION AND DIRECT OXIDATION STEPS
The invention is a process for removing sulfur from a gas containing sulfur compounds as H2S, SO2, COS, CS2..., in a quantity of up to 15%wt; it particularly concerns gases emanating from the Claus process. The process comprises a first hydrogenation of the sulfur compounds into H2S, the hydrogenation gas being used to regenerate a deactivated bed of oxidation catalyst, both being carried out at 200-500° C. After sulfur removal, the resulting gas undergoes a second hydrogenation step and then a direct oxidation step, said step being operated under the dew point of sulfur to trap the formed sulfur in the catalyst. In the further cycle, the gas streams are switched so as to regenerate the catalyst in run which is deactivated. In a preferred embodiment, the process operates in at least 2 identical reactors, each containing a bed of hydrogenation catalyst followed (in the sense of the flow of gas) by a direct oxidation catalyst bed containing an embedded heat exchanger.
The present invention is directed to a process for the removal of hydrogen sulfide and sulfur recovery from a H2S-containing gas stream by catalytic direct oxidation and Claus reaction through two or more serially connected catalytic reactors, wherein a specific control of the oxygen supplement is operated. The control and improvement of the process is obtained by complementing, in each major step of the process, the H2S-containing gas stream by a suitable flow of oxygen, namely before the H2S-containing gas stream enters the Claus furnace, in the first reactor of the process and in the last reactor of the process. Especially in application in a SubDewPoint sulfur recovery process the H2S/SO2 ratio is kept constant also during switch-over of the reactors R1 and R by adding the last auxiliary oxygen containing gas directly upstream the last reactor R so that the H2S/SO2 ratio can follow the signal of the ADA within a few seconds.
patents