单元操作不但适用于许多物理工艺过程,对化学工艺过程也同样如此.
例如,生产普通食盐的工艺过程包含以下依次进行的单元操作：运输固体/液体原料；传递热量；蒸发；结晶；干燥；筛渣.这些步骤中并不产生化学反应.
另一方面来说,不管是否用到催化剂,石油的裂解都是典型的化学反应.对于裂解石油而言,其涉及的单元操作（运输液体/固体原料；蒸馏；各种机械分离法）都是不可或缺的,少了这些步骤,裂解反应根本无法实现.这些单元操作所服务的化学工序主要通过控制原料/能量流入流出反应区而实现.
英语翻译The unit operations are as applicable to many physical p
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