Continuous recycle heating process for the production of soda ash and alkali metal phosphates

Claim 1

A CONTINUOUS HEAT TRANSFER PROCESS WHICH COMPRISES CONTACTING RECYCLE SODA ASH WITH A HEATING GAS HEATED ABOVE THE TEMPERATURE NECESSARY TO HEAT THE FEED MATERIAL TO THE DESIRED PRODUCT TEMPERATURE IN A CONCURRENT FLOW WHEREBY THE RECYCLE SODA ASH IS SUPERHEADTED AND THE HEATING GAS IS TEMPERED, CONTACTING THE FEED MATERIAL SELECTED FROM THE GROUP CONSISTING OF SODIUM SESQUICARBONATE, SODIUM CARBONATE MONOHYDRATE AND MOIST ANHYDROUS SODAT ASH TO BE HEATED WITH THE TEMPERED HEATING GAS IN A CONCURRENT FLOW AND MIXING THE SUPERHEATED RECYCLE SODA ASH WITH THE FEED MATERIAL, WHEREBY THE FEED MATERIAL IS HEATED BY TRANSFER OF HEAT FROM THE HEATING GAS AND THE SUPERHEATED RECYCLE SODA ASH TO THE DESIRED SODA ASH TEMPERATURE, RECOVERING PART OF THE HEAT MATERIAL AND RECYCLING THE REMAINDER OF THE MATERIAL TO CONTACT WITH THE HEATING GAS.

Claim 3

THE METHOD OF PRODUCING ALKALI METAL PHOSPHATE SALTS FROM ALKALI METAL PHOSPHATE SOLUTIONS, WHICH COMPRISES CONTACTING RECYCLE ALKALI METAL PHOSPHATE SALT WITH A HOT GAS, HEATED ABOVE THE TEMPERATURE REQUIRED TO CONVERT ALKALI METAL PHOSPHATE SOLUTIONS INTO SOLID SALTS WHEREBY THE RECYCLE ALKALI METAL PHOSPHATE SALT IS SUPERHEATED, CONTACTING THE ALKALI METAL PHOSPHATE SALT IS SUPERHEATED, CONTACTING THE ALKALI METAL PHOSPAHTE SOLUTION WITH THE SUPERHEATED RECYCLE CALT TO CONVERT THE ALKALI METAL PHOSPHATE SOLUTION INTO CRYSTALLINE SALT, CONTACTING THE CRYSTALLINE SALT WITH TEMPERED HEATING GAS TO DEHYDRATE THE SAID SALT, RECOVERING A PORTION OF THE CRYSTALLIZED SALT AND RECYCLING THE REMAINDER OF THE CRYSTALLINE ALKALI METAL SALT TO CONTACT WITH THE HOT HEATING GAS.

Claim 4

THE METHOD OF PRODUCING ALKALI METAL PHOSPHATE SALTS FROM ALKALI METAL PHOSPHATE SOLUTIONS, WHICH COMPRISES CONTACTING RECYCLE ALKALI METAL PHOSPHATE SALT WITH A HOT GAS, HEATED ABOVE THE TEMPERATURE REQUIRED TO CONVERT ALKALI METAL PHOSPHATE SOLUTIONS INTO SOLID SALTS WHEREBY THE RECYCLE ALKALI METAL PHOSPHATE SALT IS SUPERHEATED, CONTACTING THE ALKALI METAL PHOSPHATE SALT IS SUPERHEATED, CONTACTING THE ALKALI METAL PHOSPAHTE SOLUTION WITH THE SUPERHEATED RECYCLE CALT TO CONVERT THE ALKALI METAL PHOSPHATE SOLUTION INTO CRYSTALLINE SALT, CONTACTING THE CRYSTALLINE SALT WITH TEMPERED HEATING GAS TO DEHYDRATE THE SAID SALT, RECOVERING A PORTION OF THE CRYSTALLIZED SALT AND RECYCLING THE REMAINDER OF THE CRYSTALLINE ALKALI METAL SALT TO CONTACT WITH THE HOT HEATING GAS.