Patent ID: 7727311

Claim:
Installation for treatment of a gas that is loaded with impurities by at least one liquid phase that comprises: a) a column (C) having an upper end and a lower end that comprises means ( 1 ) for introducing gas loaded with impurities at one end of said column, means ( 9 ) for drawing off depolluted gas at the other end of column (C), and within said column (C) at least: a first internal ( 2 ) comprising means for introducing and distributing a liquid phase comprising a solvent for said impurities into the upper portion of column (C), a first bed ( 6 ) comprising packing, a second internal ( 3 ) comprising means for gas/liquid separation ( 19 , 20 , 21 ) of a mixture comprising liquid obtained from the first bed and gas present or entrained with said liquid; first means for collecting and evacuating ( 32 , 4 ) at least a portion of the separated liquid phase, means ( 100 ) for passing through said second internal ( 3 ) gas circulating in the column; and at a level in said column (C) means ( 31 , 101 ) for injecting, mixing and distributing an outside liquid phase with said gas, said second internal comprising a number of vertical shafts for gas passage distributed over a cross section of the column, said shafts being provided with lateral holes in the lower portion at the level of the distribution of the outside liquid phase, and lacking lateral holes in the upper portion, at the level of said first means ( 32 , 4 ) for collecting and evacuating, at least a second bed ( 8 ) comprising a packing, second means ( 10 ) for collecting and evacuating the liquid phase obtained from bed ( 8 ) located at the bottom in the lower portion of the column, and b) means ( 11 , 15 , 17 , 7 b ) for recycling at least a portion of the liquid phase that is collected in the lower portion of the column to said first internal ( 2 ) and/or to said second internal ( 3 ), and wherein said means ( 1 ) for introducing the gas that is loaded with impurities are placed at the lower end of said column (C) allowing advance of the liquid and the gas to be run at counter- currently in the column and in which said second means ( 10 ) for evacuating the liquid phase in the lower outlet of column (C) are connected to said second internal ( 3 ), and wherein the recycling means comprises a solvent regeneration device ( 5 ) fed at least by the liquid phase that is obtained from the second means ( 10 ) for evacuating the liquid phase, and means for injecting at least a portion of regenerated solvent ( 7 a , 16 — FIG. 2 ) obtained from said solvent regeneration device ( 5 ) to the first internal, further comprising means ( 7 a , 7 b , 17 — FIG. 2 ) for mixing a portion of the regenerated solvent obtained from said solvent regeneration device ( 5 ) with the liquid phase that is collected at the lower outlet of column (C) and recycled to said second internal ( 3 ).