桉木循环强化预水解过程中有机酸变化规律

doi:10.3969/j.issn.0253-2417.2016.04.016

Abstract

Abstract: The generation and variations of organic acids during circulation-enhanced pre-hydrolysis of eucalyptus were in present study. The time effects of eucalyptus circulation-enhanced pre-hydrolysis were examined with a 6:1 (mL:g) liquid-solid ratio at 190℃ under varied holding time, and then the hot water pre-hydrolysate obtained under the corresponding conditions was used in the circulation-enhanced pre-hydrolysis process with different ratios. The results showed that formic acid and levulic acid contents in the circulation-enhanced pre-hydrolysate firstly increased with the prolonged time and acetic acid content , and then fluctuated at a relative high level. At the same time, total sugars in pre-hydrolysate show a trend of firstly increasing and then declining.The eucalyptus circulation-enhanced pre-hydrolysis was conducted with a 6:1 liquid-solid ratio for 60 min under different temperature, and then the obtained pre-hydrolysates were used in the circulation-enhanced pre-hydrolysis process with different ratios. The results showed that formic acid, acetic acid , levulic acid and total sugars contents in the circulation-enhanced pre-hydrolysate increased with the increase of hydrolytic temperature. Among the studies mentioned above, organic acid contents increased with the rising of circulation ratio. Enrichment of organic acids during circulation-enhanced pre-hydrolysis process was beneficial for their utilization and their catalytic actions of pre-hydrolysis process.

Key words: eucalyptus, circulation, pre-hydrolysis, organic acid

CLC Number:

TQ351

GUO Huai-ze, MA Ming-shuai, LI Hai-ming, GUO Yan-zhu, ZHOU Jing-hui, CUI Jing-long. Organic Acids Variations during Circulation-enhanced Pre-hydrolysis of Eucalyptus[J]. Chemistry and Industry of Forest Products, 2016, 36(4): 113-120.

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Organic Acids Variations during Circulation-enhanced Pre-hydrolysis of Eucalyptus

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