Process of recovering sodium carbonate from the mother liquor bleed

Claim 1

A PROCESS FOR THE PRODUCTION OF SODA ASH FROM CRUDE TRONA WHICH COMPRISES DISSOLVING THE TRONA IN A RECYCLING MOTHER LIQUOR TO FORM AN AQUEOUS SOLUTION OF SODIUM SESQUICARBONATE CONTAINING SODIUM CHLORIDE, EVAPORATING WATER FROM THE SODIUM SESQUICARBONATE SOLUTION TO FORM A MAJOR SLURRY OF SODIUM SESQUICARBONATE CRYSTALS IN A MOTHER LIQUOR, BLEEDING OFF A PORTION OF THE MOTHER LIQUOR FROM THE SLURRY WHEN THE MOTHER LIQUOR CONTAINS APPROXIMATELY 6% SODIUM CHLORIDE, EVAPORATING WATER FROM THE BLEED STREAM UNTIL THE SODIUM CHLORIDE CONTENT IS NEAR ITS SATURATION POINT TO FORM A MINOR SLURRY OF SODIUM SESQUICARBONATE AND SODIUM CARBONATE MONOHYDRATE CRYSTALS IN A MOTHER LIQUOR, SEPARATING THE MOTHER LIQUOR OF HIGH SODIUO CHLORIDE CONTENT FROM THE MINOR SLURRY OF CRYSTALS, DISCARDING THE MINOR MOTHER LIQUOR, RECYCLING THE SODIUM SESQUICARBONATE AND SODIUM CARBONATE MONOHYDRATE CRYSTALS FROM THE MINOR SLURRY TO THE MAJOR SLURRY OF SODIUM SESQUICARBONATE IN MOTHER LIQUOR FROM WHICH THE BLEED STREAM HAS BEEN REMOVED, WHEREIN THE SAID MONOHYDRATE CRYSTALS DISSOLVE IN THE MAJOR SLURRY OF SODIUM SESQUICARBONATE CRYSTALS, SEPARATING THE MOTHER LIQUOR AND THE SODIUM SESQUICARBONATE CRYSTALS IN THE MAJOR SLURRY WHICH CONTAINS ONLY SODIUM SESQUICARBONATE CRYSTALS, RECYCLING THE MAJOR MOTHER LIQUOR TO DISSOLVE MORE TRONA, CALCINING THE SODIUM SESQUICARBONATE CRYSTALS SEPARATED FROM THE MAJOR SLURRY TO SODA ASH AND RECOVERING THE SAID SODA ASH.