State Key Laboratory of Pulp and Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
Bioresour Technol. 2012 Apr;110:715-8. doi: 10.1016/j.biortech.2012.01.093. Epub 2012 Jan 28.
Formaldehyde was used as a polymerization agent to perform hydrothermal carbonization of black liquor for solid fuel production from 220 to 285°C. Compared to hydrochar prepared without formaldehyde, hydrochar produced in the presence of a 2.8wt.% formaldehyde solution (hydrochar-F) had 1.27-2.13 times higher yield, 1.02-1.36 times higher heating value (HHV), 1.20-2.31 times higher C recovery efficiency, 1.20-2.44 times higher total energy recovery efficiency, 0.51-0.64 times lower sulfur content, and 0.48-0.89 times lower ash content. The HHV of hydrochar-Fs ranged from 2.2×10(4) to 3.0×10(4)kJ/kg, while the HHV of hydrochar-F produced at 285°C was 1.90 times greater than that of the raw material (black liquor solid). These considerable improvements indicated that formaldehyde was an effective additive in hydrothermal carbonization of black liquor.
甲醛被用作聚合剂，在 220 至 285°C 条件下对黑液进行水热碳化以生产固体燃料。与未经甲醛处理的水热炭相比，在含有 2.8wt.%甲醛溶液（水热炭-F）的条件下制备的水热炭的产率提高了 1.27-2.13 倍，高位发热量（HHV）提高了 1.02-1.36 倍，碳回收率提高了 1.20-2.31 倍，总能量回收率提高了 1.20-2.44 倍，硫含量降低了 0.51-0.64 倍，灰分含量降低了 0.48-0.89 倍。水热炭-Fs 的高位发热量在 2.2×10(4)至 3.0×10(4)kJ/kg 之间，而在 285°C 下制备的水热炭-F 的高位发热量比原料（黑液固）高 1.90 倍。这些显著的改善表明甲醛是黑液水热碳化的一种有效添加剂。
