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US 7,842,828 B2Granted
Method for separating out and recovering dialkyltin dialkoxide
AssigneeAsahi Kasei Chemicals Corporation
InventorsBudianto Bijanto, Nobuhisa Miyake
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AssigneeAsahi Kasei Chemicals Corporation
InventorsBudianto Bijanto, Nobuhisa Miyake
Estimating the term…
For an alkyltin alkoxide catalyst composition used in carbonate production, there is a problem that the alkyltin alkoxide catalyst composition is thermally decomposed by being heated in the production process, changing into an undistillable alkyltin alkoxide catalyst composition containing a high boiling deactivated component and an active component. The present invention provides a method for separating out and recovering the active component from the alkyltin alkoxide catalyst composition as a useful dialkyltin dialkoxide. According to the present invention, there is disclosed a method in which such an undistillable alkyltin alkoxide catalyst composition containing a high boiling deactivated component and an active component is reacted with an alcohol and/or a carbonate, so as to obtain a reaction liquid containing a product originating from the active component, and then the reaction liquid is subjected to distillation, so as to separate out and recover a dialkyltin dialkoxide from the product originating from the active component.
A method for separating out and recovering an active component, by converting the active component into a dialkyltin dialkoxide, from an undistillable alkyltin alkoxide catalyst composition for use in a carbonate production, which contains a high boiling deactivated component and the active component, the method comprising the steps of:
Dependencies are inferred from the claim text.
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Preparation of esters of carbonic or haloformic acids: from carbon dioxide or inorganic carbonates
Containing organo-metallic compounds or metal hydrides: metal aryl or alkyl compounds
Regeneration or reactivation: of catalysts containing metals
Regeneration or reactivation of catalysts, in general: heat treatment
About 1 year 1 month of term left · ends 18 Nov 2027 (estimated)
The present application is a U.S. National Phase Application of International Application PCT/JP2007/053254 (filed Feb. 22, 2007) which claims the benefit of Japanese Patent Application No. 2006-046596 (filed Feb. 23, 2006), both of which are hereby incorporated by reference in their entirety.
The present invention relates to separating out and recovering a dialkyltin dialkoxide from an alkyltin alkoxide catalyst composition used as a catalyst in ester or carbonate production.
A dialkyltin dialkoxide is very useful as a catalyst such as a carbonate synthesis catalyst, a transesterification reaction catalyst, a silicone polymer or urethane curing catalyst.
FIG. 1 illustrates a conceptual diagram showing a method for separating out and recovering a dialkyltin dialkoxide in the present invention;
FIG. 2 illustrates a conceptual diagram showing a continuous carbonate production apparatus using an alkyltin alkoxide catalyst composition in the present invention; and
FIG. 3 illustrates a conceptual diagram of an example of a column reactor used in the present invention.
101, 107: distillation column; 102, 201: column reactor; 103, 106 thin film evaporator; 104: autoclave; 105: carbon dioxide removal tank; 111, 112, 117: reboiler; 121, 123, 126, 127: condenser; 211: lower portion of reactor; 221: upper portion of reactor; 1, 9, 21, 22: supply line; 2, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14 transfer line; 3, 15, 23: recovery line; 16: withdrawal line; 17: feed line; 24: low boiling component recovery line.
An embodiment of the present invention will now be described in detail. The following embodiment is merely illustrative for explaining the present invention, the present invention not being intended to be limited to only this embodiment. So long as the gist of the present invention is not deviated from, various modifications are possible.
In the present invention, an undistillable alkyltin alkoxide catalyst composition containing a high boiling deactivated component and an active component is reacted with an alcohol and/or a carbonate, and the reaction liquid thus obtained is subjected to distillation, so as to separate out and recover a dialkyltin dialkoxide from a product originating from the active component.