请问，间歇精馏和连续精馏有什么差别，间歇精馏用在什么地方
请问，间歇精馏和连续精馏有什么差别，间歇精馏用在什么地方，，谢谢，不太明白间歇精馏一般用于珍贵物料，或者连续生产不了的物料。一般间歇精馏投资低于连续精馏。 看看下面这段话的介绍吧！
Processing mode refers to the way in which feed and product are introduced and withdrawn from the process. Distillation occurs in two modes, continuous distillation and batch distillation.
Continuous distillation is feed is sent to the still all the time and product is drawn out at the same time. The idea in continuous distillation is that the amount going into the still and the amount leaving the still should always equal each other at any given point in time.
Batch distillation is when the amount going into the still and the amount going out of the still is not supposed to be the same all the time. The easiest example to use is like old fashioned spirit making. The distiller fills a container at the start, then heats it, as time goes by the vapors are condensed to make the alcoholic drink. When the proper quantity of overhead (drink) is made, the distiller stops the still and empties it out ready for a new batch. This is only a simple case, in industrial usage what goes on gets very complex.
Both continuous and batch distillation are very important to industry. Continuous distillation is most often used with big volume products like jet fuel, benzene, plastic monomers. Batch distillation is most often used with smaller volume products and in plants that make lots of different things and use the same still for many products (in different batches).
327845876 发表于 2013-5-6 22:02 static/image/common/back.gif
间歇精馏一般用于珍贵物料，或者连续生产不了的物料。一般间歇精馏投资低于连续精馏。
马哥，在aspen模拟过程中有什么区别呢@tdl522 @罗修绝
supercaosong 发表于 2013-5-6 22:23 static/image/common/back.gif
马哥，在aspen模拟过程中有什么区别呢@tdl522 @罗修绝
这得自己捉摸了！
本帖最后由 罗修绝 于 2013-5-7 08:49 编辑
间歇精馏又称分批精馏。将原料分批加入釜内，每蒸馏完一批原料后，再加入第二批料。所以，对批量少，品种多，且经常改变产品要求的分离，常采用间歇精馏。
间歇精馏有两种操作方式：
（1）恒定回流比R
（2）恒定塔顶组成xD
在实际操作中常将两者结合起来进行操作
间歇精馏有以下特点：
a. 动态过程
b. 只有精馏段
可以看看这个，也许有帮助
http://wenku.baidu.com/view/27739725192e45361066f559.html 罗修绝 发表于 2013-5-7 08:45 static/image/common/back.gif
间歇精馏又称分批精馏。将原料分批加入釜内，每蒸馏完一批原料后，再加入第二批料。所以，对批量少，品种多 ...
非常感谢回答{:1106_389:}
连续精馏为稳态操作，塔内温度分布、组成分布、回流等保持不变。
间歇精馏随着轻组分的采出，塔釜沸点逐渐升高，塔顶回流比也需逐渐升高，操作过程呈非稳态
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