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US 8,178,711 B2Granted
Method for the purification of triorganophosphites by treatment with a basic additive
AssigneeInvista North America S.A R.L.
InventorJoachim C. Ritter
Life of this patent
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Abstract
One or more triorganophosphite components are separated from a crude phosphite mixture containing acidic hydrolysis products. The crude phosphite mixture is contacted with a basic additive to produce a second mixture comprising a first phase and a second phase. The first phase comprises the basic additive and one or more acidic hydrolysis products and the second phase comprises one or more triorganophosphite components.
Claims3
A method for preparing triorganophosphites, said method comprising:
- a) contacting an alcohol with PCl3 in the presence of a triorganoamine to produce a first reaction product comprising one or more organophosphites and triorganoamine hydrochloride;
- b) removing the triorganoamine hydrochloride from the first reaction product to produce a second reaction product optionally containing one or more triorganophosphites, diorganohydrogenphosphite (R2O)(R3O)POH, organodihydrogenphosphite (R1O)(HO)PO(H) and H3PO3, wherein R1, R2 and R3 are independently selected from the group consisting of C1 to C18 alkyl, C6 to C18 aryl and hydroxyaryl, and C3 to C18 cycloalkyl and hydroxyalkyl radicals, and wherein R2 and R3 can optionally be connected to each other directly by a chemical bond or through an intermediate divalent group R9, wherein R9 is selected from the group consisting of —O—, —S—, and —CH(R12)—, wherein R12 is selected from the group consisting of H, C6 to C18 aryl, and C1 to C18 alkyl;
- and
- c) removing at least a portion of one or more of the compounds diorganohydrogenphosphite (R2O)(R3O)POH, organodihydrogenphosphite (R1O)(HO)PO(H) and H3PO3 by contacting the second reaction product with a basic additive.
1 more element
Dependencies are inferred from the claim text.