Process for the formation of hydrocarbyl bis(hydrocarbyl phosphate)
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United States of America Patent
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May 12, 1998
Issued Date -
N/A
app pub date -
Jul 29, 1996
filing date -
Nov 1, 1994
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Expired
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Abstract
A process for forming a composition containing over, for example, about 90% by weight of an alkylene-arylene bridging group-containing bis(diphenyl phosphate) compound and less than, for example, 10%, by weight, of monophosphate by-product. This process involves the reaction of a composition containing a diphenyl halophosphate and an alkylene-arylene bridging group-containing diol, in the presence of a catalytic amount of a Lewis acid catalyst, utilizing a means, during the course of the reaction, for removal of hydrohalide by-product. The preferred means that are used for removal of hydrohalide by-product include: performing the reaction in a hydrocarbon solvent; utilizing vacuum to remove such by-product; utilizing sparging with an inert gas; and compatible combinations of one or more of the foregoing means.
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