Left: A AIR B Ethylbenzene+xylene C Paraffines C11 D Paraffines C12 E Paraffines C13 F -2°C +3°C glycole circuit G Freezing unit H Condensed solvent I Power supply L Not miscible water exchange M Power supply N Condensed solvent recovery O E The plant is intended to ecology and waste treatment, as a package for the depuration and the recovery of organic solvents from a gaseous current. In the specific the technology has been tested on a sample made of air, ethylbenzene, xylene, and three kinds of paraffin symbolically identified in the flow chart, but it could be extended to a variety of gaseous polluting flows. The functioning principle is based on a two stages fractioned condensation: the chemical-physical features of the pollutants are used to partially separate them, into two reactors where the flow come into contact, in the first case, with batteries and pipes of glycolic water, in the second, with a direct expansion refrigerating gas system. The product of the second stage is extracted with a pump and sent to the recovery system; the product of the first stage, that has still got a certain amount of dampness, is sent to a storage tank, in which a separation occurs due to a sedimentation; on one side water is recovered, on the other, water is extracted, filtered to eliminate the residual dampness, and finally sent to the recovery system. The plant is developed according to the customer’s needs and specifications, regarding to the processing, the products and the technologies. The plant has got a power and control electric switchboard. The management is completely automatic, with refrigerating units control, pumps starting, instruments consent management, etc.

NECESSARY DATA FOR THE DESIGN
NEEDED DATA FOR THE DESIGN (TO BE DEFINED WITH THE CUSTOMER)
Gaseous flow to treat
Typology, features and amount of the solvent to recover
Available spaces for the location of the plant
Available electric power

TECHNICAL DATA
TECHNICAL FEATURES
Plant for the recovery of solvents from a gaseous current through a two-stages condensation
Primary condansation reactor through glycolic water circulation
Glycolic water production freezing unit, with circulator and automatic 3 ways regulating valve
Secundary condensation reactor with direct expansion, with pump that relaunches the condensed solvents
Direct expansion freezing unit
Storage tank for the solvent coming from the primary condensation, with two stages and a intermediate section, automatic level control for the expulsion of the water and of the solvent
Filtering and pumping unit for the separation of the remaining water from the condensed solvent current
General electric switchboard, with PLC for the management of all the cycles and the regulation of the plant