Open AccessExperimental study of the hydrothermal reactivity of oxalic acid under high pressure
Author(s) -
Kefei Chen,
Yuanju Li,
Chen Zhang,
Shengyang Zhou,
Jing Li,
Pengpeng Li,
Zexiang Sun,
Bingkun Meng,
Deliang Fu
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/600/1/012003
Subject(s) - oxalic acid , dissolution , feldspar , hydrothermal circulation , decomposition , chemistry , thermal decomposition , thermal stability , decarboxylation , mineralogy , inorganic chemistry , materials science , chemical engineering , catalysis , organic chemistry , metallurgy , quartz , engineering
The thermal stability of organic acids has a close relationship with the formation mechanism of secondary pores in deep reservoirs. Experiments were conducted to investigate the thermal stability of oxalic acid under high pressure and the influence of K-feldspar on oxalic acid decomposition. The experiment temperatures were set in the range of 130-330°C and each experiment was performed for 72h under 60MPa. Results show that both temperature and K-feldspar have significant influence on the decomposition of oxalic acid. The oxalic acid decomposed slowly at temperatures less than 180°C, and most of the oxalic acid decomposed at temperatures between 180°C and 230°C. Besides, the decarboxylation reaction proceeded more slowly in the presence of K-feldspar than the mineral-free experiments, which is most likely attributed to the increasing pH caused by dissolution. In addition, because the decomposition rate of oxalic acid was low, the K-feldspar dissolution was not affected at temperatures lower than 230°C.