Production of hci

Claim 1

A METHOD OF RECOVERING SUBSTANTIALLY ANHYDROUS HYDROGEN CHLORIDE FROM AQUEOUS SOLUTIONS THEREOF WHICH COMPRISES INTRODUCING A HOT, SOLID-FREE CONCENTRATED AQUEOUS SOLUTION OF A HYGROSCOPIC SALT INTO THE UPPER PORTION OF A VERTICALLY DISPOSED, PACKED ZONE, SAID SOLUTION AND ZONE AT THE POINT OF INTRODUCTION THEREOF BEING AT A TEMPERATURE OF ABOUT THE BOILING TEMPERATURE OF THE HYGROSCOPIC SALT SOLUTION, FEEDING AN AQUEOUS SOLUTION OF HYDROGEN CHLORIDE INTO AN INTERMEDIATE PORTION OF THE ZONE BELOW THE POINT OF SALT INTRODUCTION, THE TEMPERTURE OF THE ZONE AT THE POINT OF HYDROGEN CHLORIDE SOLUTION INTRODUCTION BEING BELOW THE TEMPERATURE AT EITHER END OF THE ZONE, WITHDRAWING FROM THE LOWER PORTION OF THE ZONE AN AQUEOUS SOLUTION OF THE HYGROSCOPIC SALT, SAID WITHDRAWN SOLUTION BEING AT A LOWER TEMPERATURE AND CONTAINING A LOWER SALT CONCENTRATION THAN THE SALT FEED SOLUTION AND REMOVING GASEOUS HYDROGEN CHLORIDE FROM THE UPPER SECTION OF THE ZONE.

Claim 2

A METHOD OF RECOVERING SUBSTANTIALLY ANHYDROUS HYDROGEN CHLORIDE FROM AQUEOUS SOLUTIONS THEREOF WHICH COMPRISES INTRODUCING A HOT, SOLID-FREE CONCENTRATED AQUEOUS SOLUTION OF A HYGROSCOPIC SALT INTO THE UPPER PORTION OF A VERTICALLY DISPOSED, PACKED ZONE, SAID SOLUTION AND ZONE AT THE POINT OF INTRODUCTION THEREOF BEING AT A TEMPERATURE OF ABOUT THE BOILING TEMPERATURE OF THE HYGROSCOPIC SALT SOLUTION, FEEDING AN AQUEOUS SOLUTION OF HYDROGEN CHLORIDE INTO AN INTERMEDIATE PORTION OF THE ZONE BELOW THE POINT OF SALT INTRODUCTION, THE TEMPERTURE OF THE ZONE AT THE POINT OF HYDROGEN CHLORIDE SOLUTION INTRODUCTION BEING BELOW THE TEMPERATURE AT EITHER END OF THE ZONE, WITHDRAWING FROM THE LOWER PORTION OF THE ZONE AN AQUEOUS SOLUTION OF THE HYGROSCOPIC SALT, SAID WITHDRAWN SOLUTION BEING AT A LOWER TEMPERATURE AND CONTAINING A LOWER SALT CONCENTRATION THAN THE SALT FEED SOLUTION AND REMOVING GASEOUS HYDROGEN CHLORIDE FROM THE UPPER SECTION OF THE ZONE.