Gas absorbtion is commom unit operation, determination of mass transfur constant in packet tower have important significance for the hight of mass transfor unit aswellas caculation of the hight packet tower in order to determine mass transfer constant in packet tower , many related expert establish standard constant equation from unit analysis strategy.

Effect of unit operations on physical and chemical parameters and pulp particle size ofcarrot juice was investigated.

To make green chemical engineering to be true, many methods should be taken to improve Green Chemical Technology, Unit operation and Process system integration related with environmental input minimization, The paper comments on the deve lop ment of these aspects and points out the corres.

Such unit operations as fluid flow,the opera- tion .

At the same time,key operation unit and equipmentses are determine.

This paper introduces the features o f the computer -aided experimental t eaching system for chemical unit operations,and connecting with the concrete application of the compute r -aided experiment in chemical unit operations experiment,discusses on the instru ctional mode of combining the comput er -aided experiment with the lab fie ld experi-ment.

Basic study methods in unit operation of heat transfer;