Rotary apparatus for combined multi flashing and boiling liquids

An evaporator for concentrating a solution or for separating ingredients from a solution, said evaporator comprising a plurality of vertically stacked vessels with central conduit means for conveying the solution sequentially from one vessel to the next along a center axis of the evaporator, at least one of the vessels being formed by two conical downwardly converging coaxial walls joined together at the periphery by a cylindrical wall, said at least one vessel having an interior space which can be maintained at an initial pressure and distributor means associated with said interior space for subjecting solution conveyed to said at least one vessel by the central conduit means to a pressure which is greater than the initial pressure in the interior space and for distributing solution subjected to said greater pressure to the interior space for flashing, said at least one vessel comprising an outlet slot or slots communicating with the central conduit means, said distributor means comprising radial conduit means for distributing solution to the interior space such that unflashed solution within said at least one vessel gravitates to the conical walls, flows along the conical walls, through the outlet slot or slots and back into the central conduit means for conveyance to a succeeding vessel, the conical walls of said at least one vessel comprising heating means for boiling unflashed solution flowing therealong, said at least one vessel further comprising outlet means for removing vapor generated by said flashing and boiling of the solution.