CAJ | 학술논문

采用萃取精馏和连续多级结晶相结合的分离集成技术从C_(10)芳烃中提取均四甲苯.选择甘油为萃取剂,考察实际塔板数、回流比、萃取剂与原料液的体积比(溶剂比)、进料量、结晶温度、结晶时间、抽滤时间等因素对分离均四甲苯的影响.萃取精馏条件:实际塔板数为106块、原料进料位置为第75块塔板、萃取剂进料位置为第5块塔板、溶剂比为1.0、回流比为4、原料进料量为2 mL/min,在此条件下,萃取塔顶馏分中均四甲苯的质量分数为42.7%,收率达到98.4%.连续多级结晶条件:结晶温度-6℃、结晶时间5 h、抽滤时间20 min,在此条件下,可将均四甲苯质量分数从42.7%提纯到99.18%,收率为90.95%.
채용췌취정류화련속다급결정상결합적분리집성기술종C_(10)방경중제취균사갑분.선택감유위췌취제,고찰실제탑판수、회류비、췌취제여원료액적체적비(용제비)、진료량、결정온도、결정시간、추려시간등인소대분리균사갑분적영향.췌취정류조건:실제탑판수위106괴、원료진료위치위제75괴탑판、췌취제진료위치위제5괴탑판、용제비위1.0、회류비위4、원료진료량위2 mL/min,재차조건하,췌취탑정류분중균사갑분적질량분수위42.7%,수솔체도98.4%.련속다급결정조건:결정온도-6℃、결정시간5 h、추려시간20 min,재차조건하,가장균사갑분질량분수종42.7%제순도99.18%,수솔위90.95%.
Separation of durene from C_(10) aromatics was carried out by integrated separation technologies of combining extractive distillation with multistage crystallization. Glycerol was selected as extractant. Effects of actual plate number, reflux ratio, volume ratio of extractant to feedstock (solvent ratio), feedstock flow rate, crystallization temperature, crystallization time and filtration time on separation of durene were investigated. Under optimal extractive distillation conditions: actual plate number 106 plate, feedstock position 75th plate, extractant feeding posion 5th plate, solvent ratio 1.0, reflux ratio 4 and feedstock flow rate 2 mL/min, mass fraction of durene in overhead and yield of durene can reach 42.7% and 98.4%, respectively. Under optimal multistage crystallization conditions: crystallization temperature -6 ℃, crystallization time 5 h and filtration time 20 min, mass fraction of durene crystal can reach farther from 42.7 % to 99.18 % and yield of durene is 90.95 %. The overall yield of the integrated separation technologies (by combining extraction distillation with multistage crystallization) is 89.49 %.