Water tends to move across a membrane from a solution of low solute concentration to one of high. Or, in other words, since solutions with a high amount of dissolved solute have a lower concentration of water, water will move from a solution of high water concentration to one of lower. This process is .
Process. It can be easily separated from nitric acid as well as from water and is liquid over the complete operating temperature range which eases operation, startup and shut down of a plant. In the below diagram it can be seen that the azeotrope disappears beyond a sulfuric acid concentration of 50wt%.