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Tributyl phosphate
Tributyl phosphate, known commonly as TBP, is an organophosphorus compound with the chemical formula (CH3CH2CH2CH2O)3PO. This colourless, odorless liquid finds some applications as an extractant and a plasticizer. It is an ester of phosphoric acid with n-butanol. Tributyl phosphate is manufactured by reaction of phosphoryl chloride with n-butanol. POCl3 + 3 C4H9OH → PO(OC4H9)3 + 3 HCl Production is estimated at 3,000–5,000 tonnes worldwide. TBP is a solvent and plasticizer for cellulose esters such as nitrocellulose and cellulose acetate.

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