Experiments and Correlations of the Vapor-Liquid Equilibria for Carbon Monoxide + Propionic Acid and Carbon Monoxide + Methyl Formate Systems Yanfen, L.; Pingfang, Y.; Jia, J.; Jianguo, Z.; Rongjiao, Z.; Yiling, T.; Journal of Chemical & Engineering Data 2012, 57, 1887-1893