Process for the manufacture of condensed alkali metal phosphates

Claim 1

IN A PROCESS FOR THE PREPARATION OF CONDENSED ALKALI METAL PHOSPHATES FROM PHOSPHORIC ACID AND ALKALI METAL CHLORIDE COMRPISING FROMING A SPRAYABLE MIXTURE OF SAID ACID AND ALKALI METAL CHLORIDE IN A RATIO OF SAID ACID AND CHLORIDE CORRESPONDING TO THE PHOSPHATE TO BE PREPARED, SPRAYING SAID MIXTURE OF ALKALI METAL CHLORIDE AND PHOSPHORIC ACID INTO A REACTION CHAMBER CONTAINING HOT GAS AT TEMPERATURE BELOW 1200* C., DISTRIBUTING COOLING AGENT OVER THE OUTER WALL OF THE REACTION CHAMBER IN VARYING AMOUNTS AND IN SUCH A PATTERN THAT THE PLACES WITH GREATEST HEAT DEVELOPMENT IN THE REACTION CHAMBER LARGER AMOUNTS OF COOLING AGENT ARE APPLIED AGAINST THE CHAMBER FROM CORRESPONDING POINTS OF THE CHAMBER EXTERIOR WHEREBY A UNIFORM PROTECTING LAYER OF ALKALI METAL PHOSPHATE IS FIRST FORMED ON THE INNER WALL OF SAID REACTION CHAMBER, SAID COOLING THEREAFTER CONTROLLING THE THICKNESS, WITHDRAWING FROM THE BOTTOM OF THE RETIAL THICKNESS, WITHDRAWING FROM THE BOTTOM OF THE REACTION CHAMBER THE ADDITIONAL SUBSTANTIALLY PURE PHOSPHATE FORMED AND PASSING THROUGH THE CHAMBER, AND DISCHARGING HYDROGEN CHLORIDE AND WATER VAPOR FROM THE TOP OF THE REACTION CHAMBER.