无溶剂自双相系统中酸性离子液体催化葡萄糖发酵液生产C-14乙酰丙酸酯,ACS Omega

当前位置： X-MOL 学术 › ACS Omega › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

无溶剂自双相系统中酸性离子液体催化葡萄糖发酵液生产C-14乙酰丙酸酯
ACS Omega ( IF 3.7 ) Pub Date : 2020-03-02 , DOI: 10.1021/acsomega.9b03517
Chandrakant Mukesh ₁ , Dariush Nikjoo ₂ , Jyri-Pekka Mikkola _{1,

3}

Affiliation

在这里，我们提出了2,3-丁二醇的C-14乙酰丙酸酯作为糖发酵液的产物。设计的布朗斯台德酸性离子液体（BAIL）催化剂可与酯产物进行自诱导相分离，并且已经研究了阴离子的作用。酯化反应是在无溶剂介质和低温（60-105°C）下通过2,3-丁二醇（2,3-BDO）和乙酰丙酸进行的。为了进行比较，在酯化反应中，使用具有不同阴离子的硫酸，Amberlite IR-120和磺酸官能化的吡啶鎓离子液体作为催化剂。在80℃下24小时内将2,3-BDO完全转化后，形成的二酯产物，即2,3-二丁基丁烷双（4-氧戊酸）丁酯，收率（85％）和选择性（85％）好℃。观察到单酯的产率低（8％）。单酯和二酯通过液-液萃取法分离。酯产物通过各种仪器技术进行表征，例如¹ H和¹³ C NMR，GC-FID，LC-MS和FT-IR光谱。BAILs的哈米特酸度功能通过紫外-可见光谱确定。催化剂已成功回收并在工艺中重复使用。用过的BAILs可在六个连续的循环中重复使用，而二酯的收率和选择性降低约7％。产生的乙酰丙酸酯将用作生物燃料添加剂，溶剂，增塑剂和其他应用。

"点击查看英文标题和摘要"

Production of C-14 Levulinate Ester from Glucose Fermentation Liquors Catalyzed by Acidic Ionic Liquids in a Solvent-Free Self-Biphasic System

Herein, we present the C-14 levulinate ester of 2,3-butanediol as the product of sugar fermentation liquors. The designed Brønsted acidic ionic liquid (BAIL) catalysts enable self-induced phase separation with ester products, and the role of anions has been investigated. Esterification reactions were carried out by 2,3-butanediol (2,3-BDO) and levulinic acid in solvent-free media and low temperatures (60–105 °C). For comparison, sulfuric acid, amberlite IR-120, and sulfonic acid-functionalized pyridinium ionic liquids with different anions were utilized as a catalyst upon esterification reaction. The diester product, namely, butane-2,3-diyl bis(4-oxopentanoate), was formed with a good yield (85%) and selectivity (85%) after complete conversion of 2,3-BDO in 24 h at 80 °C. The low yield (8%) of the monoester was observed. The monoester and diester were separated by a liquid–liquid extraction method. The ester products were characterized by various instrumental techniques such as ¹H and ¹³C NMR, GC–FID, LC–MS, and FT-IR spectroscopy. The Hammett acidity functions of BAILs were determined from UV–vis spectroscopy. The catalyst was successfully recycled and reused in the processes. The spent BAILs were reused in six consecutive cycles with only a ∼7% diminished diester yield and selectivity. The produced levulinate ester will be useful as biofuel additives, solvents, plasticizers, and other applications.

更新日期：2020-03-19

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>