CN114409536A - 一种基于低共熔溶剂催化合成肉桂酸异丁酯的方法 - Google Patents
一种基于低共熔溶剂催化合成肉桂酸异丁酯的方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/08—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
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- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/0215—Sulfur-containing compounds
- B01J31/0225—Sulfur-containing compounds comprising sulfonic acid groups or the corresponding salts
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Abstract
本发明公开了一种以酸性低共熔溶剂ChCl‑DES为催化剂制备肉桂酸异丁酯的方法,其中,催化剂ChCl‑DES是由氯化胆碱和对甲苯磺酸按1:1的摩尔比混合制备而成;肉桂酸异丁酯是由肉桂酸与过量异丁醇在一定温度下进行酯化反应,并依次经过相分离、常压蒸馏和减压蒸馏等过程制备而得。本发明运用低共熔溶剂作为酯化反应的催化剂,相比于传统质子酸催化剂,低共熔溶剂具有对设备腐蚀性小、无废酸排放、易回收重复利用和反应条件温和等优点,在降低生产成本的同时,也符合绿色合成工艺的要求。
Description
技术领域
本发明属于有机化工合成领域,涉及一种香料肉桂酸异丁酯的制备方法,具体涉及一种利用低共熔溶剂催化合成肉桂酸异丁酯的方法。
背景技术
肉桂酸酯类衍生物是香精香料的主要配料,而且还具有抗病毒活性,抗紫外线活性,抗氧化活性,抗酶活性和抗癌活性,使其在医药、食品以及日用品中具有广泛的应用和开发价值。肉桂酸异丁酯是一种具有甜蜜的水果和香脂香,类似辛香料、膏甜琥珀香气略带可可豆及果香底韵的油状液体。因此,肉桂酸异丁酯潜在的市场需求使它的合成制备备受关注。
肉桂酸异丁酯制备方法有四种:一是传统的质子酸催化加热合成法,所用催化剂主要为浓硫酸等强酸,该法存在反应时间长、副反应多、环境污染大和生产成本高等缺点。二是采用肉桂酰氯与异丁醇加热反应制取,但酰氯价格较高,反应放出的氯化氢有严重的腐蚀性且污染环境。三是固体酸催化剂直接酯化法催化合成肉桂酸异丁酯,优点是反应迅速,对环境友好的,但不足之处在于所用醇的量很大,后期分离所需能耗较大,且微波运用于大规模生产能耗较大。四是在离子液体中催化肉桂酸和醇的酯化反应,但离子溶液并不完美,具有合成繁琐,提纯复杂,成本昂贵,毒性较强等不可避免的缺点,大大限制了其进一步的规模化应用。
随着人们对环保意识的增强及相关环保例律的管制,寻求催化效率高、热稳定性好、环境污染少的酯化反应催化剂具有重要的理论意义和工业应用前景。近年来,低共熔溶剂作为催化剂不断被开发出来,本发明提出用低共熔溶剂ChCl-DES作为催化剂,其制备方法简单容易,对设备腐蚀性小,反应条件温和,易回收重复利用,极大克服了传统催化剂的缺点,具有较大的工业应用价值及发展潜力。
发明内容
本发明的目的是针对现有技术的不足,公开一种利用低共熔溶剂催化合成肉桂酸异丁酯的方法。并通过控制反应工艺条件,在较低成本下获得酯化反应产品,以满足相关领域需要。
本发明的方法包括如下步骤:
(1)按1:1的摩尔比分别称取适量的氯化胆碱和对甲苯磺酸,将两者分别在75℃下真空干燥50 min,再将两者混合并加热搅拌反应至澄清透明溶液,反应温度为60℃~78℃,反应所得产物即为低共熔溶剂催化剂ChCl-DES,将催化剂密封并放置在硅胶干燥箱中,备用;
(2)按1:1~2.2的摩尔比分别称取适量反应物肉桂酸和异丁醇,将两者均加入三口烧瓶中,搅拌加热至80℃~110℃后,再向三口烧瓶中加入适量步骤(1)所得的催化剂ChCl-DES并在该温度下进行反应,加入的催化剂质量为反应物中酸的质量的40%~70%,反应时间为1~7 h;
(3)反应结束后将反应液经分液漏斗分为水油两相,对水相在75℃下进行真空干燥以回收催化剂; 对油相先进行常压蒸馏以除去过量异丁醇,再减压蒸馏调节液相温度为91℃~93℃,压力为1.6 KPa,收集馏分,经无水氯化钙干燥,得到成品肉桂酸异丁酯。
本发明的创新点在于运用低共熔溶剂ChCl-DES作为酯化反应的催化剂,相比于传统质子酸催化剂,低共熔溶剂具有对设备腐蚀性小、无废酸排放、易回收重复利用和反应条件温和等优点,在降低生产成本的同时,也符合绿色合成工艺的要求。
具体实施方式
低共熔溶剂催化剂ChCl-DES的制备
分别称取 16.7556g(0.12 mol)氯化胆碱和22.8252g(0.12 mol)对甲苯磺酸一水合物,将两者分别在75℃下真空干燥50 min,再将两者混合并加热搅拌反应至澄清透明溶液,温度为60℃~78℃,将所得的低共熔溶剂催化剂ChCl-DES密封并放置在硅胶干燥箱中,备用。
实施例1
分别称量8.8902(0.06 mol)肉桂酸和5.3368g(0.072mol)异丁醇,均加入三口烧瓶中,搅拌加热至100℃后,再向三口烧瓶中加入4.4451g催化剂ChCl-DES并在该温度下进行反应,反应时间为7 h;反应结束后将反应液趁热经分液漏斗分为水油两相,对水相在75℃下进行真空干燥以回收催化剂。对油相先进行常压蒸馏以除去过量异丁醇,再减压蒸馏调节液相温度为91℃~93℃,压力为1.6 KPa,收集馏分,经无水氯化钙干燥,通过GC-MS鉴定为肉桂酸异丁酯,其收率为85.41%。
实施例2
分别称量8.8902g(0.06 mol)肉桂酸和6.2262g(0.084mol)异丁醇,均加入三口烧瓶中,搅拌加热至80℃后,再向烧瓶中加入6.2231g催化剂ChCl-DES并在该温度下进行反应,反应时间为3h;反应结束后将反应液趁热经分液漏斗分为水油两相,对水相在75℃下进行真空干燥以回收催化剂。对油相先进行常压蒸馏以除去过量异丁醇,再减压蒸馏调节液相温度为91℃~93℃,压力为1.6 KPa,收集馏分,经无水氯化钙干燥,通过GC-MS鉴定为肉桂酸异丁酯,其收率为86.06%。
实施例3
分别称量8.8902g(0.06 mol)肉桂酸和8.8946g(0.12 mol)异丁醇,均加入三口烧瓶中,搅拌加热至110℃,再向三口烧瓶中加入4.4451g催化剂ChCl-DES并在该温度下进行反应,反应时间为1 h;反应结束后将反应液趁热经分液漏斗分为水油两相,对水相在75℃下进行真空干燥以回收催化剂。对油相先进行常压蒸馏以除去过量异丁醇,再减压蒸馏调节液相温度为91℃~93℃,压力为1.6 KPa,收集馏分,经无水氯化钙干燥,通过GC-MS鉴定为肉桂酸异丁酯,其收率为90.26%。
实施例4
分别称量8.8902g(0.06 mol)肉桂酸和9.7841g(0.132 mol)异丁醇,均加入三口烧瓶中,搅拌加热至100℃,再向三口烧瓶中加入3.5561g催化剂ChCl-DES并在该温度下进行反应,反应时间为3 h;反应结束后将反应液趁热经分液漏斗分为水油两相,对水相在75℃下进行真空干燥以回收催化剂。对油相先进行常压蒸馏以除去过量异丁醇,再减压蒸馏调节液相温度为91℃~93℃,压力为1.6 KPa,收集馏分,经无水氯化钙干燥,通过GC-MS鉴定为肉桂酸异丁酯,其收率为92.04%。
Claims (3)
1.一种利用低共熔溶剂催化合成肉桂酸异丁酯的方法,其特征在于包括以下步骤:
(1)按1:1的摩尔比分别称取适量的氯化胆碱和对甲苯磺酸,将两者分别在75℃下真空干燥50 min,再将两者混合并在60℃~78℃温度下搅拌至澄清透明溶液,反应所得产物即为低共熔溶剂催化剂ChCl-DES,将ChCl-DES密封并放置在硅胶干燥箱中,备用;
(2)分别称取适量反应物肉桂酸和异丁醇,将两者均加入三口烧瓶中,搅拌加热至指定温度后,再向三口烧瓶中加入适量步骤(1)所得的催化剂进行反应,反应时间为1~7 h;
(3)反应结束后趁热将反应液经分液漏斗分为水油两相,对水相在75℃下进行真空干燥以回收催化剂;对油相先进行常压蒸馏以除去过量异丁醇,再减压蒸馏调节液相温度为91℃~93℃,压力为1.6 KPa,收集馏分,经无水氯化钙干燥,得到成品肉桂酸异丁酯。
2.根据权利要求1所述的方法,其特征在于所述的肉桂酸与异丁醇的摩尔比为1:1~2.2,所述的催化剂质量为肉桂酸质量的40%~70%。
3.根据权利要求1所述的方法,其特征在于所述步骤(2)的酯化反应温度为80℃~110℃。
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