Influence of potassium salts on the decomposition of formaldehyde in supercritical water

ZHAO Liang; ZHANG Jun; ZHONG Hui; DING Qi-zhong; CHEN Xiao-wu; XU Cheng-wei; REN Zong-dang

Volume 41 Issue 03

Mar. 2013

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Article Navigation > Journal of Fuel Chemistry and Technology > 2013 > 41(03): 302-308

ZHAO Liang, ZHANG Jun, ZHONG Hui, DING Qi-zhong, CHEN Xiao-wu, XU Cheng-wei, REN Zong-dang. Influence of potassium salts on the decomposition of formaldehyde in supercritical water[J]. Journal of Fuel Chemistry and Technology, 2013, 41(03): 302-308.

Citation:

ZHAO Liang, ZHANG Jun, ZHONG Hui, DING Qi-zhong, CHEN Xiao-wu, XU Cheng-wei, REN Zong-dang. Influence of potassium salts on the decomposition of formaldehyde in supercritical water[J]. Journal of Fuel Chemistry and Technology, 2013, 41(03): 302-308.

Citation:

ZHAO Liang, ZHANG Jun, ZHONG Hui, DING Qi-zhong, CHEN Xiao-wu, XU Cheng-wei, REN Zong-dang. Influence of potassium salts on the decomposition of formaldehyde in supercritical water[J]. Journal of Fuel Chemistry and Technology, 2013, 41(03): 302-308.

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Influence of potassium salts on the decomposition of formaldehyde in supercritical water

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China

Received Date: 2012-09-02
Rev Recd Date: 2012-11-26
Publish Date: 2013-03-30

Abstract

Abstract

The influences of potassium salts on the decomposition of formaldehyde in supercritical water were investigated in a continuous reactor under 400～650℃, 23～29 MPa and a residence time of 4～12 s, as formaldehyde is one of the most important intermediate products for the gasification of biomass with supercritical water. The results showed that KHCO₃, K₂CO₃, KCl and mixed potassium salts are able to reduce the fraction CO in the gaseous product and increase the fraction of CO₂, which then depresses the heating value of the gaseous product. All these potassium ingredients exhibit an inhibitive effect on the formation of H₂, CO and CO₂ and the gasification efficiency; the inhibition strength of various potassium ingredients follows the order of mixed potassium salts > KHCO₃ > K₂CO₃ > KCl. The inhibitive effect on the formation of gaseous products is enhanced under high reaction temperature and long residence time, but is almost independent on the reaction pressure. Under high temperature, high pressure and long residence time, gas generation may be inhibited considerably by the mixed potassium salts, possibly due to a synergetic effect of different potassium salts.
- potassium salts,
- formaldehyde,
- supercritical water gasification,
- influencing rule

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References(24)

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