Phenol → Phenol, aluminum salt (3:1)

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In a reactor was placed 19364 parts (206 moles) of phenol. The reactor was flushed with nitrogen and while stirring 114 parts (1 moles) of triethyl aluminum were added. The reactor was sealed and the mixture was reacted for 30 minutes to form aluminum triphenoxide. Then heat was applied while pumping isobutylene into the reactor. As the reaction became exothermic cooling was applied to hold the temperature in the range of 115°-125° C. Total isobutylene feed was 24282 parts over a 45 minute period. The maximum pressure was about 300 psig. Stirring was continued at about 115° C. as isobutylene reaction continued causing the pressure to drop to 105 psig over a 11/2 hour period. Analysis by GC showed the phenol content at this time to be 0.7 wt percent.

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