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

林产化学与工业 ›› 2016, Vol. 36 ›› Issue (4): 113-120.doi: 10.3969/j.issn.0253-2417.2016.04.016

桉木循环强化预水解过程中有机酸变化规律

郭怀泽^1,2, 马明帅¹, 李海明^1,2, 郭延柱¹, 周景辉¹, 崔金龙¹

1. 大连工业大学轻工与化学工程学院, 辽宁大连 116034;
2. 华南理工大学制浆造纸工程国家重点实验室, 广东广州 510640

收稿日期:2015-10-22 出版日期:2016-08-25 发布日期:2016-09-01
通讯作者: 李海明,副教授,硕士生导师,主要从事生物质精炼研究;E-mail:charley1114@163.com。 E-mail:charley1114@163.com
作者简介:郭怀泽(1991-),男,河南光山人,硕士生,主要从事制浆造纸清洁生产研究
基金资助:
国家自然科学基金资助项目（31370584）

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

GUO Huai-ze^1,2, MA Ming-shuai¹, LI Hai-ming^1,2, GUO Yan-zhu¹, ZHOU Jing-hui¹, CUI Jing-long¹

1. School of Light Industry Engineering and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China;
2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China

Received:2015-10-22 Online:2016-08-25 Published:2016-09-01

摘要/Abstract

摘要： 以桉木为原料，将桉木经热水预水解后，将预水解液按不同比例循环回用于桉木的预水解，在桉木粉（8 g）与不同水解介质6：1（mL：g）的条件下，探讨了循环强化预水解过程中，主要的有机酸（乙酸、甲酸和乙酰丙酸）及总糖的生成和变化情况。结果表明：反应温度190℃，在不同保温时间下，循环强化预水解液中的甲酸和乙酰丙酸浓度随着保温时间的延长而增加，而乙酸浓度则先增加，后期虽有波动，但是稳定在较高水平，而总糖则呈现先增加后下降的趋势；保温时间60 min，在不同预水解温度下，循环强化预水解液中的有机酸和总糖质量浓度随着预水解温度的升高呈现增加的趋势；在上述两种效应研究中，循环比的增大均对循环强化预水解液中的有机酸质量浓度提升有正面效应。循环强化预水解工艺的水解过程自产酸得以富集，利于其资源化利用，而自产酸具有催化水解进程的功能。

关键词: 桉木, 循环, 预水解, 有机酸

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

中图分类号:

TQ351

郭怀泽, 马明帅, 李海明, 郭延柱, 周景辉, 崔金龙. 桉木循环强化预水解过程中有机酸变化规律[J]. 林产化学与工业, 2016, 36(4): 113-120.

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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桉木循环强化预水解过程中有机酸变化规律

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

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