Abstract: Method for the recovery of solvent from a solvent-based wash liquid containing non-hazardous waste resulting from an equipment cleaning operation. The wash solution typically averaging approximately 90 percent solvent and 10 percent resin, pigments and other dissolved or suspended solids is continuously tumbled in a tumbler/evaporator vessel together with a highly porous, adsorbent extender in granulated form, while maintaining temperatures sufficient to evaporate the solvent and prevent the solid matter from sticking together after processing. The extender is a substantially inert, material and may be selected from diatomaceous earth, powdered calcium silicate, powdered glass (100 mesh), oak sawdust (100 mesh), cedar sawdust (100 mesh), bentonite, charcoal (100 mesh) and ground corn cobs. The amount of extender introduced into the vessel is of the order of 5 to 20 percent by weight of the wash solution. The system may employ jacketed ribbon, double cone or rotating helix blenders.

Abstract: A sampling pump having a helix rotor is immersed below the surface of the liquid composition being prepared within a large tank in which the contents are mixed, agitated and heated or cooled by various means. A drive motor positioned above the tank imparts rotation to the helix pump rotor through an elongated coupling shaft. A stream of the liquid is lifted vertically upward through an elongated extension housing inside the vessel and then through a conduit external to the vessel and ultimately returns the liquid stream to the tank. Analytical instrumentation may be provided at intervals along the external conduit for performing desired chemical and physical analyses. A three-way valve in the conduit is provided to selectively dispense samples for analysis elsewhere, without interrupting the stream flow and thus insuring the representative character of the sample. A stuffing box assembly is employed for completely isolating the drive and/or the motor from the liquid contents.