Patent ID: 7678906

Claim:
A process for producing triphenylboron-pyridine (TPBP) comprising generally spherical solid particles which comprises: (A) providing a product slurry comprising solid TPBP particles in an aqueous mother liquor in a vigorously agitated reaction zone; (B) separately feeding into said vigorously agitated reaction zone (i) a stream of pyridine and (ii) a stream comprising a solution of an alkali hydroxide adduct of triphenylboron (TPBA), whereby the total concentration of TPBA in the combined feed streams is in the range of from about 1 wt % to about 6 wt %, to form additional TPBP in the product slurry; (C) adding to the product slurry a sufficient amount of acid to adjust pH of the product slurry to a value of about 8.5 to about 12.0; and (D) removing a product stream from said reaction zone at such a rate that the volume of said product slurry in the reaction zone remains substantially constant, and the concentration of solid TPBP in the product slurry is maintained at a value of less than about 8 wt %.