High viscosity potassium metaphosphate
AssigneeStauffer Chemical Company
InventorLieh-Jiun Shyu
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Abstract
An improved process for preparing potassium metaphosphate is provided which comprises reacting potassium ions, preferably from the carbonate or bicarbonate, with phosphare ions in an amount sufficient to provide a K/P molar ratio ranging from about 0.85 to about 0.95 substantially in the absence of metal ion other than potassium under heat for a period of time and at a temperature sufficient to convert the potassium and phosphate ions to potassium metaphosphate but insufficient to overconvert. A product of higher viscosity can be obtained by dissolving the potassium metaphosphate in sodium bicarbonate rather than using other sources of sodium ion, particularly when the potassium metaphosphate is prepared with potassium bicarbonate or potassium carbonate.
Claims7
A process for preparing potassium metaphosphate of high solution viscosity which comprises reacting potassium ion derived from potassium carbonate, potassium bicarbonate or potassium orthophosphate with phosphate ion in an amount sufficient to provide a K/P ratio on a molar basis ranging from about 0.85 to about 0.95 substantially in the absence of metal cation other than potassium under heat for a period of time and at a temperature sufficient to convert the potassium and phosphate ions to potassium metaphosphate but insufficient to overconvert.
Dependencies are inferred from the claim text.