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US 6,599,565 B1Granted
Bittern-containing common salt grains and process for preparing the same
AssigneeUmai Co., Ltd.
InventorsMasaru Umai, Tadaharu Watanabe
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AssigneeUmai Co., Ltd.
InventorsMasaru Umai, Tadaharu Watanabe
Estimating the term…
The invention provides a common salt having the rounded-off savory taste of natural common salt and yet a reduced tendency toward deliquescence and coagulation and a process for producing the same. The invention further provides a method for fractional recovery of freshwater and raw materials for the above common salt from seawater in connection with the production of the same common salt. The common salt of the invention is a bittern-containing granular common salt with each of its grains consisting of a core comprised of a bittern-containing composition optionally containing NaCl and, as covering the grain, a coating layer comprised of a NaCl-containing composition optionally containing CaSO4 or bittern. The method for fractional recovery of freshwater and raw materials for the above common salt from seawater according to the invention comprises a step of treating seawater with a reverse osmosis membrane to fractionate it into freshwater and a salt-containing water and subjecting the salt-containing water to an ion exchange treatment to fractionate it into a NaCl-containing composition and a bittern-containing composition or a step of subjecting seawater to an ion exchange treatment to fractionate it into an aqueous NaCl-containing solution and an aqueous bittern-containing solution and subjecting each of the aqueous NaCl-containing solution and aqueous bittern-containing solution to a reverse osmosis membrane treatment to fractionate it into freshwater and either a NaCl-containing composition or a bittern-containing composition.
A method of producing a bittern-containing granular common salt in which each grain thereof comprises a core composed of a bittern-containing composition optionally containing sodium chloride and in which the surface of said core is covered with a coating layer composed of a sodium chloride-containing composition optionally containing calcium sulfate,
A method of producing a bittern-containing granular common salt in which each grain thereof comprises a core composed of a bittern-containing composition optionally containing sodium chloride and in which the surface of said core is covered with a coating layer composed of a composition containing bittern and sodium chloride, wherein the proportion of the bittern in said coating layer is smaller than that of the bittern in the bittern-containing composition contained in the core,
A method of producing a bittern-containing granular common salt in which each grain thereof comprises a core composed of a bittern-containing composition optionally containing sodium chloride and in which the surface of said core is covered with a coating layer composed of a sodium chloride-containing composition optionally containing calcium sulfate,
A method of producing a bittern-containing granular common salt in which each grain comprises a core composed of a bittern-containing composition optionally containing sodium chloride and in which the surface of said core is covered with a coating layer composed of a composition containing bittern and sodium chloride, where the proportion of the bittern in said coating layer is smaller than that of the bittern in the bittern-containing composition contained in the core,
Dependencies are inferred from the claim text.