ASPEN PLUS: LANGMUIR KINETICS (LHHW)
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In this video we will see how to implement Langmuir-Hinshelwood-Hougen-Watson Kinetics. \r
Langmuirs reions usually occur when we have adsorption on a surface, that is tipical of catalysts. As example we use the kinetics of the partial oxidation of methanol to give formaldheyde and water over a Fe-Mo catalyst. The rate of reion is made of a kinetic for multiplied for teta methanol and teta oxygen that are the following. For every costant we have the pre exponential value and the ivation energy in the table. The problem is that in Aspen we have to insert Langmuir kinetics as the combination of three terms: a kinetic for, the driving force expression and an adsorption expression.\r
For this reason we have to combine the teta fors to obtain this expression. Now we need also the value for costants that are the products of constants because aspen requires only one input. An other problem is that Aspen wants the K in the logarithmic form. So we have to insert A e B values for every costant, where A is the log of the pre exponential for. We have to convert the value in the internation system and apply the logarithm. B instead is the ratio of the ivation energy and the universal costant with the opposite sign.
Channel: \r
TUTORIALS ASPEN: \r
Info: lascuolatech@gmail.com\r
\r
In this video we will see how to implement Langmuir-Hinshelwood-Hougen-Watson Kinetics. \r
Langmuirs reions usually occur when we have adsorption on a surface, that is tipical of catalysts. As example we use the kinetics of the partial oxidation of methanol to give formaldheyde and water over a Fe-Mo catalyst. The rate of reion is made of a kinetic for multiplied for teta methanol and teta oxygen that are the following. For every costant we have the pre exponential value and the ivation energy in the table. The problem is that in Aspen we have to insert Langmuir kinetics as the combination of three terms: a kinetic for, the driving force expression and an adsorption expression.\r
For this reason we have to combine the teta fors to obtain this expression. Now we need also the value for costants that are the products of constants because aspen requires only one input. An other problem is that Aspen wants the K in the logarithmic form. So we have to insert A e B values for every costant, where A is the log of the pre exponential for. We have to convert the value in the internation system and apply the logarithm. B instead is the ratio of the ivation energy and the universal costant with the opposite sign.