Optimal Precipitation of Organotin Fluorides by Cation Exchange

Location

CSU

Student's Major

Chemistry and Geology

Student's College

Science, Engineering and Technology

Mentor's Name

Brian Groh

Mentor's Department

Chemistry and Geology

Mentor's College

Science, Engineering and Technology

Description

Organotin halides account for 10% of tin consumption worldwide. Known for their biocidal activity, trialkyltin compounds are the active components of agricultural fungicides and paint preservatives. Halogenated organotins and their derivatives have wide application and use in research and industry, and their use continues to grow. However, organotins are highly toxic compounds, often formed as by-products in reactions. Consequently, the removal and recycling of organotin halides from the waste stream is imperative. The focus of our research is the development of a cyclic reaction sequence to remove and recycle organotin halides. Treatment of soluble tributyltin chloride with fluoride ion causes the precipitation of tributyltin fluoride. We have examined the effects of substrate, solvent, time, and cation exchange to optimize removal of the precipitated compound from solution. In our process, it is then possible to convert tributyltin fluoride back to tributyltin chloride, the precursor of many organotin compounds used in industry.

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Optimal Precipitation of Organotin Fluorides by Cation Exchange

CSU

Organotin halides account for 10% of tin consumption worldwide. Known for their biocidal activity, trialkyltin compounds are the active components of agricultural fungicides and paint preservatives. Halogenated organotins and their derivatives have wide application and use in research and industry, and their use continues to grow. However, organotins are highly toxic compounds, often formed as by-products in reactions. Consequently, the removal and recycling of organotin halides from the waste stream is imperative. The focus of our research is the development of a cyclic reaction sequence to remove and recycle organotin halides. Treatment of soluble tributyltin chloride with fluoride ion causes the precipitation of tributyltin fluoride. We have examined the effects of substrate, solvent, time, and cation exchange to optimize removal of the precipitated compound from solution. In our process, it is then possible to convert tributyltin fluoride back to tributyltin chloride, the precursor of many organotin compounds used in industry.