at least some of the solvent and the condensed solvent is recovered the gas is then reheated until it is no longer saturated with solvent the reheated gas is returned to the drying chamber systems such as the one described above are well known and are described for instance in morris solvent recovery system u s pat no 4 469 720 sept 4 1984 the morris patent also teaches use of a spray scrubber which is neither required nor forbidden in the present application optimum temperatures for each step of the solvent recovery process will vary depending upon the solvent and the gas used those temperatures can easily be ascertained by experimentation pressures in the system may be subatmospheric or superatmospheric but are conveniently about ambient pressure when the solvent is 1 1 1 trichloroethane and the gas used is air the air in the drying chamber is preferably at least about 60 u00b0 c more preferably at least about 75 u00b0 c and most preferably at least about 100 u00b0 c the air in the condenser is preferably cooled to at most about 40 u00b0 c more preferably at most about 10 u00b0 c the air preferably flows at at least about one foot per second more preferably at least about two feet per second the maximum air flow is limited by practical considerations but is preferably about four feet per second in its most preferred embodiments such a system can recover about 66 percent of the solvent retained by the mold or.