普通蒸馏和闪蒸的区别.ppt

2023/9/11,Principies of Chemical Engineering_ Distillation,1,9.3 简单蒸馏与平衡蒸馏,一、简单蒸馏,简单蒸馏也称微分蒸馏，间歇非稳态操作(unsteady batch operation)，在蒸馏过程中系统的温度和汽液相组成均随时间改变。,y,原料液,x,蒸气,冷凝器,1、定义,2023/9/11,Principies of Chemical Engineering_ Distillation,2,9.3 简单蒸馏与平衡蒸馏,2023/9/11,Principies of Chemical Engineering_ Distillation,3,2、特点 间歇操作过程是一动态过程；易挥发组分更多地传递到气相中去，釜液温度不断升高；产品与釜液组成随时间而改变(降低）；瞬时蒸气与釜中液体处于平衡状态。,9.3 简单蒸馏与平衡蒸馏,2023/9/11,Principies of Chemical Engineering_ Distillation,4,二、平衡蒸馏,定义,闪蒸罐,塔顶产品,yA,xA,加热器,原料液,塔底产品,Q,减压阀,9.3 简单蒸馏与平衡蒸馏,2023/9/11,Principies of Chemical Engineering_ Distillation,5,9.3 简单蒸馏与平衡蒸馏,2023/9/11,Principies of Chemical Engineering_ Distillation,6,(2)特点 连续操作；组成和温度恒定不变；气、液两相平衡。,温度和压力对平衡蒸馏的影响,9.3 简单蒸馏与平衡蒸馏,