20130294977 | APPARATUS FOR USE IN PRODUCTION OF NITRIC ACID - A heat exchange apparatus is disclosed for use in the production of nitric acid and which provides for feed-effluent heat exchange and integrated nitrogen dioxide absorption. The apparatus includes a core structure having first and second groups of diffusion bonded corrosion resistant metal plates having fluid flow channel systems formed therein. A feed-effluent heat exchange system is provided by first channel systems of the first and second groups of plates being juxtaposed in heat exchange relationship and an absorption system is provided by second channel systems of the first and second groups of plates being juxtaposed in heat exchange relationship. | 11-07-2013 |