粗苯酐与杂醇油综合利用制备增塑剂的研究

在固体酸催化下 ,粗苯酐与杂醇油直接酯化再经减压蒸馏制备邻苯二甲酸C4 ～C5混合酯增塑剂 ,经中试生产表明 ,该工艺技术是可行的 ,苯酐及C4 ～C5醇回收利用率均可达 90 %以上 ,且废水排放量很少。其最佳工艺条件为 :(1)酯化反应　 (C4 ～C5醇 )∶(苯酐 ) =2 6∶1 0 ,催化剂用量为反应物总质量的 1 5 % ,温度 110～ 16 0℃ ,时间 5h ,反应在搅拌下进行 ;(2 )减压蒸馏　蒸馏压力 <2 0kPa。

STUDY ON PREPARING PLASTICIZER BY COMPREHENSIVE UTILIZATION OF CRUDE PHTHALIC ANHYDRIDE AND FUSEL OIL

The preparation of qualified phthalic C 4～C 5 mixed ester plasticizer involves direct esterification of crude phthalic anhydride with fusel oil catalyzed by solid acid and distillation of the ester under reduced pressure.It was indicated by trial production that the technique is feasible.Both rate of recovery of phthalic anhydride and C 4～C 5 alcohol can exceed 90%, and the discharge of waste water is very little.Factors such as the ratio of feedings and catalyst,reaction temperature and time,agitation and the distilling pressure were studied in the test.The optimal technological conditions are as follows.(1) For esterification, n(C 4～C 5 alcohol)∶n(C 8H 4O 3)=2.6∶1.0, amount of catalyst is 1.5% of the total mass of reactants,and the reaction is carried out at 110～160℃ for 5 h with agitation.(2)The ester is distilled under reduced pressure <2.0 kPa. The exploitation of technology will inaugurate a new approach to the comprehensive utilization of crude phthalic anhydride and fusel oil.