METHOD FOR PURIFYING TIN COMPOUNDS
A method for purifying a tin compound, including: making an inert gas pass through in, or on a surface of, a liquid containing a tin compound represented by a chemical formula RSnX 3 , where R represents a hydrocarbon group having 1 to 30 carbon atoms optionally substituted with a halogen atom, and X represents a hydrolysable substituent, to perform stripping, before or after a distillation step of the tin compound.
1 . A method for purifying a tin compound, comprising:
making an inert gas pass through in, or on a surface of, a liquid including a tin compound of formula RSnX 3 , where R is a hydrocarbon group having 1 to 30 carbon atoms optionally substituted with a halogen atom, and X is a hydrolysable substituent, to perform stripping, before or after a distillation of the tin compound.
2 . The method according to claim 1 , wherein the stripping is performed by applying ultrasonic vibration.
3 . The method according to claim 1 , wherein the inert gas is made to pass through such that the tin compound is stirred by a fine bubble of the inert gas.
4 . The method according to claim 1 , wherein an amount of the inert gas passing per unit volume with respect to a liquid surface of a container, in which the liquid is stored, is 0.1 to 4.0 m 3 (gas)/s·m 3 (liquid).
5 . The method according to claim 2 , wherein a frequency of the ultrasonic is 40 kHz to 3 M Hz, and an ultrasonic output is 0.1 to 240 W per 1 L of the tin compound.
6 . The method according to claim 1 , wherein, in the formula RSnX 3 , R is an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or an alkyl group having 1 to 10 carbon atoms substituted with a halogen atom, and X is a dialkylamino group having 1 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms.
7 . The method according to claim 1 , wherein the tin compound is at least one selected from the group consisting of t-butyltris(dimethylamino)tin, n-butyltris(dimethylamino)tin, t-butyltris(diethylamino)tin, sec-butyltris(dimethylamino)tin, n-pentyltris(dimethylamino)tin, isobutyltris(dimethylamino)tin, isopropyltris(dimethylamino)tin, t-butyltri-t-butoxy tin, n-butyltri-t-butoxy tin, and isopropyltri-t-butoxy tin.