Prediction of gaseous, liquid and solid mass yields from hydrothermal carbonization of biogas digestate by severity parameter

Abstract

The product yields of hydrothermal carbonization of digestate as well as the degree of carbonization of hydrochar are quantified as functions of process parameters by using a severity approach. In contrast to other studies, a logarithmic dependence on process severity was applied. Process severity itself was calculated from temperature, retention time and catalyst concentration. Data gained from batch experiments (190–245 °C, 140–560 min) was used to fit the model parameters. By these models basing on few selected reaction conditions, a wide range of process conditions can be covered and the yields for the solid, liquid and gaseous product phase can be predicted. Moreover, the paper delivers model equations for the prediction of the H/C and O/C ratios for the solid product phase. Such model equations can be used for process optimization and are the foundation for proper LCA calculations. For the first time, the quantitative impact of the difference in reaction conditions on the product phase yield is described and analysed

Hydrothermal Carbonization: Modeling, Final Properties Design and Applications: A Review

“…Janga et al [19] applied a more complex severity model for the prediction of the monosaccharide yield via hydrolysis of different wood by concentrated sulfuric acid. Suwelack et al [20] applied this severity model to predict the gaseous, liquid, and solid mass yield in the HTC of wheat straw.…”

“…Iryani et al [11] described the development of a shrinking core model that was ultimately used to describe the hydrolysis process and HC yields. Suwelack et al [20], and Guo et al [58] modeled HC properties based on process severity factors. Suwelack et al [20] developed a model to predict HC yields, degree of carbonization, and H/C and O/C ratios resulting from the HTC of digestate and wheat straw based on the logarithmic dependence on process severity, which was calculated based on batch experiment data.…”

“…Suwelack et al [20], and Guo et al [58] modeled HC properties based on process severity factors. Suwelack et al [20] developed a model to predict HC yields, degree of carbonization, and H/C and O/C ratios resulting from the HTC of digestate and wheat straw based on the logarithmic dependence on process severity, which was calculated based on batch experiment data. Guo et al [58] developed models to predict HC yield, carbon content, and energy content using process severity and a dose-response function for data from the carbonization of corn stalk, longan shell, NaOH-pretreated longan shell, wood, olive stone, and grape marc.…”

Hydrothermal Carbonization of Organic Waste and Biomass: A Review on Process, Reactor, and Plant Modeling

“…Several functions have been reported in literature. For example, Suwelack et al [84] demonstrated through statistical analysis that the solid, gaseous, and liquid yields follow the pattern expressed by Eq. 14.…”

Effect of hydrothermal carbonization on dewatering performance of dyeing sludge

“…(2016) 25 revealed that the temperature was the main inuential factor on HTC solid yield and carbonization, followed by citric acid (adjusting pH) and residence time. Therefore, the rst part of the study only focused on how the temperature affects the dehydration performance of sludge.…”