Patent ID: 11931723
Assignee: DONAU CARBON TECHNOLOGIES S.R.L.
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 0:
1. A plant for removing solvent from a flow of air fed to said plant by a feeding duct, said plant comprising: at least a solvent adsorbing device comprising a bed of activated carbon , said bed having a first side and a second side; a source of inert gas; heat exchangers; a source of reduced pressure Pred connected to said solvent adsorbing device; a solvent recovery device ; at least one conduit connecting said air feeding duct to a first portion of said solvent adsorbing device; an exit conduit for air exiting said adsorbing device, said exit conduit being located on a second portion of said adsorbing device, wherein said reduced pressure source is connected to said first portion of said adsorbing device and said duct feeding solvent containing air is connected to said first side of the bed of activated carbon, the reduced pressure Pred being provided by a source of reduced pressure consisting of a vacuum pump and an ejector in series, a solvent recovery column connected to said ejector, the vacuum pump being connected with a conduit for the passage of desorbed solvent to the ejector, the ejector being located downstream with respect to the vacuum pump (122), the vacuum pump (122) being connected with said solvent adsorbing device (101) to extract the solvent from a side A of the bed of activated carbon (102) wherein the temperature of said activated carbon bed side A is T1 and the temperature of at least part of the activated carbon is a temperature T2, wherein T1>T2, wherein the temperature T2 of at least part of the activated carbon is lower than the boiling point of said solvent at the pressure P present in the activated carbon adsorbing device and a reduced flow of inert gas is provided into the solvent adsorbing device during the vacuum step,
wherein the desorbed solvent is fed by the ejector to the solvent recovery column and the fluid exiting the ejector is cooled, and the gaseous solvent is condensed into a liquid.