Process for making solid triphenylboron-pyridine or its adduct
View Patent ↗A process for producing solid triphenylboron-pyridine (TPBP) spherical particles by separately feeding into a vigorously agitated reaction zone (i) a stream of pyridine and a (ii) stream comprising a solution of sodium hydroxide adduct of triphenylboron (TPBA) whereby the total concentration of TPBA in the combined feed streams is in the range of from 1 wt % to 6 wt %, and simultaneously removing a product stream from said reaction zone and recovering the triphenylboron-pyridine (TPBP) particles.
1. A process for producing triphenylboron-pyridine (TPBP) comprising generally spherical solid particles which comprises:
(1) forming a suspension of solid TPBP particles in aqueous mother liquor in a vigorously agitated reaction zone,
(2) separately feeding into said vigorously agitated reaction zone (i) a stream of pyridine and a (ii) stream comprising a solution of sodium hydroxide adduct of triphenylboron (TPBA) whereby the total concentration of TPBA in the combined feed streams is in the range of from 1 wt % to 6 wt %, and
(3) simultaneously removing a product stream from said reaction zone at a rate whereby the original volume of said suspension in the reaction zone remains substantially constant, and the concentration of solid TPBP in the suspension is maintained at a value of less than 8 wt %.
2. The process of claim 1 the total concentration of TPBA in the combined feed streams is in the range of from 3.7 wt % to 5 wt %.
3. The process of claim 1 or claim 2 in which the temperature of the suspension of solid TPBP particles in aqueous mother liquor in the reaction zone is maintained in the range of from about 20° C. to about 60° C.
4. The process of claim 3 in which the temperature is maintained in the range of from 35° C. to 45° C.