\documentclass[class=book,preview=false,crop=false]{standalone}

\usepackage{../../fiche}

\pagestyle{empty}

\begin{document}

\newcommand*{\MyPath}{../7_methodes_separation_en_chimie}
\setcounter{part}{6}
\part{Méthodes de séparation en chimie}
\pagestyle{fancy}

\localtableofcontents
\input{\MyPath/chromatographies.tex}
\input{\MyPath/extraction_liquide_liquide.tex}
\input{\MyPath/precipitation_selective.tex}
\input{\MyPath/dedoublement_racemique.tex}

\end{document}