The 13th issue of the journal Engineering Chemistry includes articles based on research results in the conversion of carbon dioxide into methanol through carbon dioxide hydrogenation, enhancement of a humidity sensor based on the zinc oxide-doped thin film, a review of mechanical and physicochemical pretreatments in essential oil extraction, biochar production, optimising co-firing ratios of solid waste-coal in industrial applications, modelling of some processes of chemical engineering etc. This journal's volume will be beneficial for many specialists in chemical engineering.