Abstract: The present invention relates to ultra-high energy impact systems and processes for reducing the particle size of materials to an average diameter as small as about 40 .mu.m. The systems include a cooling station for cooling the materials to a temperature within the range of from about -40.degree. F. to about -450.degree. F.; a milling station for reducing the particle size of the cooled materials, which station includes a rotor operating at a tip speed within the range of from about 600 to about 1500 feet per second; and an atmosphere modifier for modifying the gaseous atmosphere within the milling station.

Abstract: A process for abatement of warm melting point vapors from gas streams is provided. The warm melting point vapors are solidified by direct contact with a chilled liquid, and are subsequently removed from the chilled liquid using known separation techniques. The chilled liquid exhibits a vapor pressure at the contacting temperature which is sufficiently low to preclude unsafe levels of the chilled liquid vapor in the processed gas stream. The chilled liquid is cooled using indirect heat exchange with a cryogenic liquid and is recycled.

Abstract: Process for the transfer of refrigeration from a cryogen to a heat load via an intermediary fluid utilizing heat exchangers wherein the intermediary fluid is maintained together with an inert gas in a closed loop, which has a defined volume.