Abstract: A buffered multi-fluid heat exchanger and a buffered multi-fluid heat exchange process pertaining to the heat exchange equipment and process sector is disclosed. The heat exchanger (1) comprises a lower tubing or tube bundles (2) through which flows hot process fluid “Q” to be cooled; upper tubing or tube bundles (3) through which flows cold process fluid “F” to be heated, parallel to and spaced apart from the lower tubing (2); a vessel (4) for the tubing (2, 3) provided with inlet (2?) and outlet (2?) nozzles of the tubing (2), inlet (3?) and outlet (3?) nozzles of the tubing (3), and a portion of buffer fluid “T” that fills part of the vessel (4) that covers the lower tubing (2) through which circulates the hot process liquid “Q” to be cooled.

Abstract: This application is directed to the field of scrubbing a sulfur dioxide-laden gas stream by a phosphate rock solution, and then regenerating that sulfur dioxide gas via acidulation, by contacting the phosphate rock solution with sulfuric acid to regenerate a high purity sulfur dioxide stream.