Article ID Journal Published Year Pages File Type
240353 Procedia Chemistry 2015 10 Pages PDF
Abstract

In this paper, hydrothermal carbonation of raw K–rich ash derived from a palm oil plant factory in West Kalimantan, Indonesia had been studied and evaluated at varying temperatures of 50 °C to 300 °C, initial CO2 pressure at between 2 MPa to 2.5 MPa and a maximum final pressure of 8.5 MPa and a residence time of 30 min. The yield of the solid products was about between 47 wt% and 66 wt% and the effective CO2 content which was captured by hydrothermally solid products was between 0.057 ton · ton–1 and 0.115 ton · ton–1 following hydrothermal carbonation. In addition, dehydration of solid product occurred at mostly 300 °C, while oxidation was started at 50 °C. Obviously, both the sorption–dissociation of CO2 in the solution and hydrothermal carbonation process produce a global pressure drop in the system resulting in CO2 mineral sequestration. The carbonation efficiency of solid–fluid interactions at 25 °C and after 24 h period was 25.36% and 0.05 954 mol of CO2 were consumed by the carbonation process. At the condition applied, observed several possibilities were observed such as: the pH (alkalinity), total inorganic carbon, direct precipitation of carbonates minerals as well as crystallization of carbonates in the solution and solid products.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)