Abstract:
L'invention concerne un procédé flexible pour la purification d'un solvant inhibiteur de la formation d'hydrates lors du traitement de gaz, en particulier de monoéthylène glycol (MEG), ledit solvant ayant un point d'ébullition supérieur à celui de l'eau et étant ,à un moment au moins, en mélange avec de l'eau et des sels , le procédé opérant différemment avec la même installation selon la teneur en sels du MEG à traiter. Le procédé opère selon une phase dite de reclaiming (séparation des sels sous vide suivie de distillation sous vide) lorsque la teneur en sels dépasse le seuil de précipitation et sinon le procédé opère en phase de régénération (absence de séparation de sels et pas de fonctionnement sous vide). Avantageusement, le basculement a lieu sous asservissement à un moyen de dosage des sels.
Abstract:
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).
Abstract:
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.
Abstract:
The invention relates to a method for treating sour waters containing hydrogen sulfide and ammonia in the dissolved state, for example from sour gas treatment facilities, treatment facilities for gases from Claus processes, refining processes, etc. In a column (2) provided with internals for liquid/gas contacting, the sour water feedstock (1) is stripped using steam (3), then cooled by a cold liquid (9) and washed using cold water injection (10). This method allows to separate an ammonia-poor (5-5000 ppm) H 2 S gaseous effluent (11) and an H 2 S-lean (100-1000 ppm for example) purified water (12). The method is yet improved by adding a second column that receives the purified water from the first column and separates the hydrogen sulfide and the ammonia according to the method operated in the first column. The purified water from the second column is preferably partially injected into the first and/or the second column as wash water. The invention also relates to a facility for implementing the method according to the invention.
Abstract:
La présente invention concerne une colonne d'échange (CO) de matière et le cas échéant de chaleur entre un gaz et un liquide. La colonne d'échange (CO) comporte au moins un plateau collecteur et un système de distribution du liquide agencés entre deux lits de garnissage (7), et des moyens de recirculation du liquide (8). Les moyens de recirculation du liquide (8) relient une zone située en dessous du lit de garnissage (7) à une zone située au-dessus du plateau distributeur.
Abstract:
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.