METHOD FOR SEPARATION AND COLLECTION OF DIALKYL TIN DIALKOXIDE

摘要

An alkyl tin alkoxide catalyst composition used in the production of a carbonate ester has such a problem that the composition undergoes a thermal modification by heating during the production process and converted into an alkyl tin alkoxide catalyst composition which contains a high-boiling-point inactive component and an active component and therefore cannot be separated by distillation. Then, disclosed is a method for separating and collecting the active component from the alkyl tin alkoxide catalyst composition as a useful dialkyl tin dialkoxide. The method comprises the steps of: reacting an alkyl tin alkoxide catalyst composition that contains a high-boiling-point inactive component and an active component and cannot be separated by distillation with an alcohol and/or a carbonate ester to yield a reaction solution containing a produced derived from the active component; and distilling the reaction solution to separate and collect a dialkyl tin dialkoxide from the product derived from the active component.