RK3 - CHEMICAL ENGINEERING DEPARTMENT CHE - 409 HOMOGENEOUS...

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CHEMICAL ENGINEERING DEPARTMENT CHE - 409 HOMOGENEOUS CONTINUOUS STIRRED - TANK REACTORS RK-3 PREPARED BY: AL- ID, ABDULAZIZ ID# 909027 PARTNER: GHAZWI, MUFID ID# 913816 BEN ALSHAIKH, ESAM ID# 917086 SEC# 07 Group : C INSTRUCTOR: MR. ABU-SAUD, B. A SUBMMITTED DATE\: 13 Nov, 1996 ABSTRACT
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A reaction of 0.1 M Caustic Soda and 0.1 M Ethyl Acetate, which is found that it is a second order reaction, is studied using a continuous stirred tank reactor (CSTR). The reaction rate equation was determined and it was , -rA = 4.95 CA**2.16 mol/ l.min with 8% difference in the order and 23% in the rate constant with the literature values. The experimental and theoretical conversion were calculated and the difference between them was not too much. INTRODUCTION There are different kinds of mixed flow reactors. The continuos stirred tank reactor ( CSTR) is one of the most common known types. The reaction mixture is mixed by a stirrer in order to have a uniform composition and temperature through all the reactor 2
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CSTRs are used commonly in industries in large scales for production in large commercial quantity. However, they can be used for kinetics study of complex reaction. In this experiment, a CSTR will be studied to test the behavior of such reactors and to determine the time necessary to reach steady state. THEORETICAL BACKGROUND To study kinetics of a reaction in a CSTR it is important to make mass balance around the reactor. In + generation = Out +Acc for steady state, Acc =0 input of A = FA0 output of A = FAo (1-XA) then, V/FAo = XA/-rA , where XA= 1- CA/CAo V/FAo = (CAo-CA ) /[ CAo(-rA)] τ = V/vo = CAo XA/ -ra (1) (-rA) = KCA**n (2) The reaction accruing in the experiment is Na OH + CH3COOC2H5 C2H5OH + CH3COONa The time required to reach steady state can be calculated using the following equation S dt = 1/ α 2 dXA/ (XA**2- α 1XA + 1) (3) α 1 = FAo+2kVCAo**2 / kVCAo**2 (4) α 2 = kCAo (5) PROCEDURE 1- 20 liters of 0.1 M NaOH and 20 liter of 0.1 M ethyl acetate solutions was introduced into the feed tanks. 3
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RK3 - CHEMICAL ENGINEERING DEPARTMENT CHE - 409 HOMOGENEOUS...

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