Solvent adsorption perchloroethylene

A number of other systems are based on the use of polymers for adsorption of solvents, but perhaps of particular note is another process from the Dow Chemical Company [21]. Sorbathane is the trade name for the resin which has been specifically developed for the recovery of chlorinated solvents such as perchloroethylene and trichloroethylene. Units which use this resin are usually two-tank systems which sequentially adsorb and desorb. Adsorption is achieved by passage of the solvent-laden air through the resin which is characterised by a high surface area, small pore size, a swellable polymer matrix and fast adsorption kinetics. Desorption of the solvent occurs when the resin is heated to 80-90°C and the application of a vacuum of less than lOOmbar. The novelty and advantage of using this system is that adsorption and desorption of the stabilisers, required for these solvents, also occurs and therefore the need for restabilisation, as necessary following activated carbon recovery, is eliminated. 

Within each of the two types of operation, a cost evaluation was completed of the adsorption unit fed separately with six different solvents (toluene, n-propyl bromide, perchloroethylene, methylene chloride, trichloroethylene, andCFC-113). 

Measured adsorption data for four cleaning solvents (methylene chloride, trichloroethylene, perchloroethylene, and CFC-113) are plotted in Figure A2-l . ... 

Adsorption data of each of these four cleaning solvents can be described by all three of the adsorption isotherm equations above. This is shown in Figures A2-2 (perchloroethylene) through A2-5 (CFC-113). 

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