\documentclass[paper=a4,12pt,version=last,landscape]{scrartcl}
 
\usepackage{pgfplots}


 
\begin{document}
\centering
	\begin{tikzpicture}
				\begin{axis}[width=1.1\textwidth, height=0.9\textheight,
				xmin=0, 
				xmax=6.5,
				ymin=0,
				ymax=20,
				legend style={font=\fontsize{7}{20}},
				title=\textbf {Variation of Hydrogenation Temperature},
				ylabel={Yield [wt.-\%]},
				xlabel={Time [h]},
				legend pos= north west]

				\addplot[ black,mark=*, very thick,,line join = round] table [x index=0,y index=1, col sep=comma] {VF.csv};
				\addlegendentry{$Xylitol\  90\  C$}

				\addplot[ blue,mark=*, very thick,,line join = round] table [x index=0,y index=1, col sep=comma] {VE.csv};
				\addlegendentry{$Xylitol\  100\  C$}

				\addplot[ brown,mark=*, very thick,,line join = round] table [x index=0,y index=1, col sep=comma] {VD.csv};
				\addlegendentry{$Xylitol\  110\  C$}

				\addplot[ red,mark=*, very thick,,line join = round] table [x index=0,y index=1, col sep=comma] {VG.csv};
				\addlegendentry{$Xylitol\  140\  C$}
				


 				\addplot [mark=none, dashed] coordinates {(2.0,0) (2.0,100)};
				
		\end{axis}
	\end{tikzpicture}
\end{document}