A method for separating one or more triorganophosphite components from a crude phosphite mixture containing acidic hydrolysis products, said method comprising: contacting said crude phosphite mixture with a basic additive to produce a second mixture comprising a first phase and a second phase, wherein said first phase comprises the basic additive and one or more components independently selected from the group consisting of (R 2 O)(R 3 O)POH, (R 1 O) PO and H 3 PO 3, wherein R 1, R 2 and R 3 are independently selected from the group consisting of C 1 to C 18 alkyl, C 6 to C 18 aryl and hydroxyaryl, and C 3 to C 18 cycloalkyl and hydroxyalkyl radicals, and wherein R 2 and R 3 can optionally be connected to each other directly by a chemical bond or through an intermediate divalent group R 9; and said second phase comprises one or more triorganophosphite components independently selected from the group consisting of (R 4 O)(R 5 O)P(OR 6) and ((R 7 O)(R 8 O)PO) n A, wherein R 4, R 5, R 6, R 7 and R 8 are independently selected from the group consisting of C 1 to C 18 alkyl, C 6 to C 18 aryl and C 3 to C 18 cycloalkyl radicals, wherein each of R 4, R 5 and R 6 can optionally be connected to one or both of the other two directly by a chemical bond or through an intermediate divalent group R 10, wherein R 7 and R 8 can optionally be connected to each other directly by a chemical bond or through an intermediate divalent group R 11, wherein A is an optionally substituted or unsubstituted aliphatic, aromatic or heteroaromatic radical, wherein n is an integer greater than 1; and wherein R 9, R 10, and R 11 are independently selected from the group consisting of -O-, -S-, and -CH(R 12)-, wherein R 12 is selected from the group consisting of H, C 6 to C 18 aryl, and C 1 to C 18 alkyl; and wherein the basic additive comprises a strongly basic anion-exchange resin. contacting said crude phosphite mixture with a basic additive to produce a second mixture comprising a first phase and a second phase, wherein said first phase comprises the basic additive and one or more components independently selected from the group consisting of (R 2 O)(R 3 O)POH, (R 1 O) PO and H 3 PO 3, wherein R 1, R 2 and R 3 are independently selected from the group consisting of C 1 to C 18 alkyl, C 6 to C 18 aryl and hydroxyaryl, and C 3 to C 18 cycloalkyl and hydroxyalkyl radicals, and wherein R 2 and R 3 can optionally be connected to each other directly by a chemical bond or through an intermediate divalent group R 9; and said second phase comprises one or more triorganophosphite components independently selected from the group consisting of (R 4 O)(R 5 O)P(OR 6) and ((R 7 O)(R 8 O)PO) n A, wherein R 4, R 5, R 6, R 7 and R 8 are independently selected from the group consisting of C 1 to C 18 alkyl, C 6 to C 18 aryl and C 3 to C 18 cycloalkyl radicals, wherein each of R 4, R 5 and R 6 can optionally be connected to one or both of the other two directly by a chemical bond or through an intermediate divalent group R 10, wherein R 7 and R 8 can optionally be connected to each other directly by a chemical bond or through an intermediate divalent group R 11, wherein A is an optionally substituted or unsubstituted aliphatic, aromatic or heteroaromatic radical, wherein n is an integer greater than 1; and wherein R 9, R 10, and R 11 are independently selected from the group consisting of -O-, -S-, and -CH(R 12)-, wherein R 12 is selected from the group consisting of H, C 6 to C 18 aryl, and C 1 to C 18 alkyl; and wherein the basic additive comprises a strongly basic anion-exchange resin.