Patent ID: 8916029

Claim:
A contaminated solvent distillation system comprising: a distillation means comprising a distillation vessel for heating and vaporizing said solvent within said vessel; a drum for receiving and holding contaminated solvent; and a conduit extending between and communicating with said distillation vessel and said drum; said distillation vessel, said conduit and said drum forming a closed system wherein said conduit comprises a first conduit extending between and communicating with said distillation vessel and said drum, and a second one-way conduit for conveying solvent vapor away from said distillation vessel; whereby heating solvent in said distillation vessel causes the solvent to vaporize and causes vapor to exit through said second conduit; and subsequent cooling means for cooling of said distillation vessel to cause said vapor within said distillation vessel to condense and create a vacuum which draws solvent through said first conduit into said distillation vessel; and valve means located in said first and second conduit to permit unidirectional passage of contaminated solvent from said drum into said distillation vessel and to permit unidirectional passage of solvent vapor from said distillation vessel, wherein said valve means comprises a one-way valve located in each of said first and second conduits.