间歇法合成2,4-二叔丁基苯酚的反应工艺研究——苯酚与异丁烯的烷基化反应

以异丁烯为烷化剂 ,在间歇反应釜中研究了苯酚烷基化反应合成 2 ,4二叔丁基苯酚的反应工艺。结果表明 :在强酸性阳离子交换树脂的催化下 ,反应可以在较温和的条件下顺利进行。在温度 3 66K,压力 0 .0 84MPa(常压 ) ,催化剂 /苯酚 (质量比 ) =7.0 %∶ 1 ,以苯酚计的通烯速率为 0 .84 kg/ (kg· h) ,反应器高径比为2 .1∶ 1时 ,2 ,4二叔丁基苯酚的单程收率可达 70 % (以苯酚计 )。将烷基化产物分离后 ,利用副产物间的歧化反应可使主产物的总收率达到 95%

STUDY ON THE SYNTHETIC PRPOCESS OF 2,4Di tertBUTYLPHENOL BY BATCH PROCESS The Alkylation of Phenol with Isobutylene

The synthetic process of 2,4ditertbutylphenol was studied in a batch reactor, while isobutylene was used as alkylating agent. The results demonstrated that this reaction can be carried out successfully under temperate conditions over a catalysis of strong acidic eation exchange resin. The onebatch yield of 2,4ditertbutylphenol is about 70%(referred to phenol) on the conditions of temperature 366 K, pressure 0.084 MPa, m(catalyst)∶m(phenol)=7.0%, reactor's H∶ D=2.1 , feeding speed of isobutylene 0.84 kg/(kg·h), reaction time 90 min, the total yield can be improved to 95% approximately by the dispropertionation reactions among byproducts.