Thermodynamics and Process Improvement of Synthesis of Diphenylamine
The liquid-phase synthesis process of diphenylamine from aniline was introduced.Catalyst DQ-23 was prepared to investigate its catalytic properties of diphenylamine synthesis.Thermodynamic research on the condensation reaction of aniline to produce diphenylamine and the problem of decreased aniline conversion rate during the reaction process were considered.The process improvements were explored.DQ-23 could catalyze the synthesis of diphenylamine from aniline,catalytic efficiency of which were equal to that of the reference agent.The thermodynamic calculation results indicated that the liquid-phase synthesis of diphenylamine from aniline was not thermodynamically controlled.In addition,the study found that the high polymer generated by the polymerization of diphenylamine was an important reason for the decrease in aniline conversion rate.When 0.1%free radical scavengers were added to the reaction system,the rate of decline of aniline conversion would slow down,which could prolong the service life of the catalyst.
NETL
NSTL
万方数据
