膨胀计法评价不同温度下苯乙烯精馏阻聚剂

利用膨胀计法分别对对苯二酚(HQ)、对叔丁基邻苯二酚(TBC)、4,6-二硝基-2-仲丁基苯酚(DNBP)、高效阻聚剂(PI-70)及其复配阻聚剂对苯乙烯的阻聚效果进行评价。在60,80℃时,考察了单组分阻聚剂和复配阻聚剂的阻聚效果。实验结果表明,60℃时,DNBP和PI-70对苯乙烯的阻聚效果较好,阻聚的有效时间都达到400min以上;60℃时m(TBC)∶m(DNBP)=1∶3和m(TBC)∶m(PI-70)=1∶3复配对苯乙烯的阻聚效果最佳,阻聚时间接近600min;80℃时DNBP对苯乙烯的阻聚效果较好,阻聚的有效时间为250min;80℃时m(DNBP)∶m(PI-70)=1∶1复配对苯乙烯的阻聚效果最佳,阻聚时间接近500min。

Evaluation of Inhibitors for Styrene Distillation at Different Temperatures by Dilatometer Method

Styrene distillation inhibitors,namely hydroquinone(HQ),4-tert-butylcatechol(TBC),4,6-dinitro-2-sec-butylphenol(DNBP) and PI-70,were evaluated by the dilatometer method.The inhibition effects of the inhibitors and their compound inhibitors at 60 ℃ and 80 ℃ were investigated with the inhibitor mass fractions of(3.0-5.0)×10-4.The results showed that for single-component inhibitors,the inhibition effects of DNBP with mass fraction of 5.0×10-4 and PI-70 with mass fraction of 3.5×10-4 were good and the effective inhibition time could reach more than 400 min at 60 ℃.The multi-component inhibitors m(TBC)∶m(DNBP) 1∶3 and m(TBC)∶m(PI-70) 1∶3 were also good in the inhibition and their inhibition times all were close to 600 min at 60 ℃.Among the single-component inhibitors DNBP with mass fraction of 3.5×10-4 is the best in the inhibition at 80 ℃ and its effective inhibition time is 250 min.Among the multi-component inhibitors inhibition of m(DNBP)∶m(PI-70) 1∶1 is best and its effective inhibition time can reach about 500 min at 80 ℃.