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合成乙酸异戊酯材料的原理配置
来源:http://www.jnjrh.com 日期:2019-07-26 发布人:admin
氨基磺酸作催化剂,环己烷作带水剂,使乙酸与异戊醇反响合成乙酸异戊酯,在醇过量的条件下,可使产率到达97.6%。
Isoamyl acetate was synthesized by reaction of acetic acid with isoamyl alcohol using sulfamic acid as catalyst and cyclohexane as water carrier. Under the condition of excessive alcohol, the yield could reach 97.6%.
在装有恒压式滴液漏斗、分水器、冷凝管和温度计的三颈瓶中,参加催化剂氨基磺酸、冰醋酸和带水剂环己烷,在滴液漏斗中参加异戊醇。在油浴加热和搅拌下,滴加异戊醇并回流,环己烷循环带水至分水器中,直至水层不再增加,反响时间为2h。蒸去环己烷,将产物和催化剂别离,催化剂氨基磺酸留在三颈瓶底,可反复运用。产物用无水硫酸镁枯燥后蒸馏,将134℃以前的馏分作为反响循环物,134-142℃馏分再蒸一次。
Catalysts aminosulfonic acid, glacial acetic acid and water-carrying agent cyclohexane are used in the triple-necked bottle with constant pressure drop funnel, water separator, condensation tube and thermometer, and isoamyl alcohol is used in the drop funnel. Under the heating and stirring of oil bath, isoamyl alcohol was dripped and refluxed. Cyclohexane was circulated to the water separator until the water layer no longer increased and the reaction time was 2 hours. Cyclohexane was evaporated and the product was separated from the catalyst. The catalyst aminosulfonic acid was left at the bottom of the three-neck bottle and could be used repeatedly. The product was distilled with anhydrous magnesium sulfate after drying. The fraction before 134 C was used as a reaction cycle. The fraction at 134 - 142 C was steamed again.
酯化反响通常是比拟慢的,除参加氨基磺酸催化剂之外,还需加热才干加速反响的停止。由于反响生成的水分别与异戊醇和乙酸异戊酯生成恒沸混合物,恒沸点在93-95℃左右,需求用环己烷为带水剂,使生成的水不时被除去,从而反响温度升高有利于水的别离和进步产率。
Esterification reaction is usually comparatively slow. In addition to taking part in Sulfamic Acid catalyst, heating is needed to accelerate the stop of reaction. Because the water generated by the reaction reacts with isoamyl alcohol and isoamyl acetate to form an azeotropic mixture, the azeotropic point is about 93-95 C. Cyclohexane is needed as a water-carrying agent to remove the generated water from time to time. Therefore, the increase of the reaction temperature is beneficial to the separation of water and the improvement of the yield of water.
氨基磺酸
由于酯化反响是可逆反响,参加带水剂可使均衡向生成酯的方向挪动,并且可起到控制温度的作用,从而进步产率。传统办法用苯、甲苯为带水剂,思索到苯和甲苯的毒性对环境有影响,作者采用环己烷为带水剂收到了良好的效果。带水剂用量的几影响着酯化反响的水平,过少不利于别离水,过多会使反响温度降落,酯的产率降低。
Since the esterification reaction is reversible, the participation of water carriers can shift the equilibrium to the direction of esterification and control the temperature, thus improving the yield. The traditional method uses benzene and toluene as water carriers, and considers that the toxicity of benzene and toluene has an impact on the environment. The author uses cyclohexane as water carriers and achieves good results. The amount of water-carrying agent affects the level of esterification reaction, too little is not conducive to water separation, too much will reduce the reaction temperature and the yield of esters.
氨基磺酸能够将羧酸活化成为亲核加成底物,这时醇作为亲核试剂就可进攻底物,稍过量的醇可循环运用以进步收率。
Aminosulfonic acid can activate carboxylic acid into nucleophilic addition substrates. Alcohol as nucleophilic reagent can attack substrates. A little excess of alcohol can be recycled to improve yield.
氨基磺酸能够替代硫酸作酯化反响的催化剂,采用环己烷作带水剂,避免了氨基磺酸高温合成,并能及时移去反响生成的水,进步乙酸异戊酯产率可达97.6%,的产率。
Aminosulfonic acid can replace sulfuric acid as catalyst for esterification reaction, and cyclohexane as water carrier, avoiding high temperature synthesis of amino sulfonic acid, and removing the water generated by reaction in time. The yield of isoamyl acetate can reach 97.6%.
有了氨基磺酸上面的小总结,希望对广大客户有所帮助,如果有什么不理解的或者寻求帮助的请点击我们的网站:http://www.jnjrh.com或者来电咨询,我们会尽全力为您解决
With the above summary of aminosulfonic acid, I hope it will be helpful to our customers. If you don't understand or ask for help, please click on our website: http://www.jnjrh.com or call for consultation. We will try our best to solve it for you.