Abstract: A wall anchor for use in a friable material, composed of a generally cylindrical body having a flanged end, a central portion, and a drill end. The drill end has a generally flat blade which includes a first portion and a second portion. The first portion has a first angled cutting edge and a first side cutting edge, and the second portion has a second angled cutting edge and a second side cutting edge. These portions are formed on a common line and are offset relative to each other along a plane passing through a diameter of the cylindrical body, and these portions together form a point. The central portion and the flange end have a combined axial length, and the drill end has an axial length which is shorter than that of the central portion and the flange end.

Abstract: A two-phase small channel heat exchange matrix simultaneously provides for heat transfer and mass transfer between the liquid and vapor phases of a multi-component mixture at a single, predetermined location within a separation column, significantly improving the thermodynamic efficiency of the separation process. The small channel heat exchange matrix is composed of a series of channels having a hydraulic diameter no greater than 5.0 millimeters for conducting a two-phase coolant. In operation, the matrix provides the liquid-vapor contacting surfaces within the separation column, such that heat and mass are transferred simultaneously between the liquid and vapor phases. The two-phase coolant allows for a uniform heat transfer coefficient to be maintained along the length of the channels and across the surface of the matrix.