School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People's Republic of China.
School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People's Republic of China.
Bioresour Technol. 2018 Sep;263:289-296. doi: 10.1016/j.biortech.2018.05.008. Epub 2018 May 4.
The typical properties and yield of the refined hydrothermolytic acid (RHTA) and refined hydrothermolytic oxidation acid (RHOA) respectively prepared from cotton stalk by the hydrothermolysis process with and without hydrogen peroxide at 180-280 °C were investigated. The pH of RHOA at 180-260 °C is lower than that of RHTA. The yield of RHOA prepared at 180-280 °C is higher than that of RHTA except 230 °C. Besides, the variation trend of RHOA yield at 180-260 °C is in accordance with that of RHTA yield at 200-280 °C. The composition of RHTA and RHOA were determined using gas chromatography and mass spectrometry. The acids content of RHOA at 200 °C reaches the maximum. The phenols of RHOA at 200-230 °C is significantly higher than that of RHTA. Under oxidation atmosphere, the formation of ketones is inhibited and the secondary reactions of furan derivatives is promoted. Overall, the oxidation processing can alleviate the severe hydrothermolysis conditions for preparing post-hydrothermolysis acid.
分别采用水热法在 180-280°C 下、有无双氧水条件下从棉秆制备精制水热酸（RHTA）和精制水热氧化酸（RHOA），考察其典型性质和产率。RHOA 在 180-260°C 时的 pH 值低于 RHTA。除 230°C 外，在 180-280°C 下制备的 RHOA 的产率均高于 RHTA。此外，RHOA 在 180-260°C 时的产率变化趋势与 RHTA 在 200-280°C 时的产率变化趋势一致。采用气相色谱和质谱法确定 RHTA 和 RHOA 的组成。RHOA 在 200°C 时的酸含量达到最大值。在 200-230°C 时，RHOA 的酚含量明显高于 RHTA。在氧化气氛下，酮的生成受到抑制，呋喃衍生物的次级反应得到促进。总的来说，氧化处理可以缓解制备后水热酸的苛刻水热条件。
