From 71813e027f5a31b796435edce395da399eec2eb6 Mon Sep 17 00:00:00 2001 From: mtod92 Date: Tue, 19 Dec 2023 17:04:08 -0500 Subject: [PATCH] added biblio --- paper.md | 46 ++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 44 insertions(+), 2 deletions(-) diff --git a/paper.md b/paper.md index 0d32b4b..5fcf055 100644 --- a/paper.md +++ b/paper.md @@ -54,12 +54,54 @@ In the first section of this work, we define the general problem, in the second # Problem Definition Let’s start with a simple example of interacting species: \begin{equation}\label{eq:1} -\frac{[AB_2]}{[A][B]^2}=K1 +\frac{[AB_2]}{[A][B]^2}=K_1 \end{equation} \begin{equation}\label{eq:2} -\frac{[AB_2C]}{[AB_2][C]}=K2 +\frac{[AB_2C]}{[AB_2][C]}=K_2 \end{equation} +And their associated equilibrium constants, defined as the ratio between forward and backward reaction rates: +\begin{equation}\label{eq:3} +\frac{[AB_2]}{([A][B]^2)} = K_1 +\end{equation} +\begin{equation}\label{eq:4} +\frac{[AB_2C]}{([AB_2][C])} = K_2 +\end{equation} + +And the associated mass conservations: +\begin{equation}\label{eq:5} +[A]_{tot} = [A] + [AB_2] + [AB_2C] +\end{equation} +\begin{equation}\label{eq:6} +[B]_{tot} = [B] + 2[AB_2] + 2[AB_2C] +\end{equation} +\begin{equation}\label{eq:7} +[C]_{tot} = [C] + [AB_2C] +\end{equation} + +We can define a system comprising these equations to be simultaneously solved. +In this system, we can see that chemical equilibria consist of nonlinear functions, meaning that they cannot be expressed as a sum of their variables each raised to the power of one. A common approach to solve this problem is to linearize these equations first to make them suitable to be solved employing numerical methods. + +Common solutions in literature revolve around the so-called kinetic approach and thermodynamic approach, which involves finding the extent of reaction at the energy minimum of the system. + +The algorithm presented here the advantage of operating on a user-friendly set of equations that is intuitively employed by any user with a basic chemistry knowledge. These equations are solved with an approach equivalent to the Newton search of the logarithmic equations over the logarithm of the variables. + +# Mathematical Treatment +In a system with n different species $X_{1…n}$, the mass conservation relationship for the $i^{-th}$ species can be stated as the sum over all the species contributions with their relative stoichiometries (a). We can define the conservation of mass for species $X_i$ as: +\begin{equation}\label{eq:8} +a_1[X_1] + a_2[X_2] + ... + a_n[X_n] = [X_i]_{tot} +\end{equation} + +Or equivalently: +\begin{equation}\label{eq:9} +\sum_{j=1}^n a_j[X_j] = [X_i]_{tot} +\end{equation} + +In order to express such conservation of mass as a linear function of the logarithm of concentrations of the reactants, following the approach by Wall we must first transform the summations to products using the theory of the arithmetic-geometric mean inequality from Passy 3 as applied by Baker 4. We reorganize Eq. 7 so that the summation over all strictly positive terms *a* and *X* is rewritten as the following: + +\begin{equation}\label{eq:9} +\frac{[X_i]_{tot}}{\sum_{j=1}^n a_j[X_j]} = 1 +\end{equation} # Old Stuff