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Ph中和过程建模
2022-06-25 06:43:00 【studyer_domi】
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Ph中和过程建模
连续搅拌反应釜模型
图中:F(t)—入流酸的流量,单位:升/分钟,当做常数
U(t)—入流碱流量,即控制量,单位:升/分钟;
Xa—入流酸的浓度,单位:当量浓度(N),当做常数;
Xb—入流碱的浓度,单位:当量浓度(N),当做常数;
C1—出硫酸的总浓度,单位:当量浓度(N);
C2—出硫碱的总浓度,单位:当量浓度(N);
V—反应釜容积,单位:升,常数。
强酸强碱完全电离:C1=[H+],C2=[OH-],则:
流出容器的溶液总量=[F(t)+U(t)]C1;
流入酸的总量=F(t)Xa;
容器中总酸的变化量=VdC1/dt;
则入流溶液的总量与出流酸的总量之差为容器中总的酸的变化量
同样,碱也有如下的平衡方程式
由电离平衡得静态方程
对一元强酸强碱ai为1,其滴定方程为
令
,得
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