化学研究
化學研究
화학연구
CHEMICAL RESEARCHES
2015年
1期
19-22
,共4页
碱性离子液体%碳酸甲乙酯%碳酸二乙酯%酯交换反应
堿性離子液體%碳痠甲乙酯%碳痠二乙酯%酯交換反應
감성리자액체%탄산갑을지%탄산이을지%지교환반응
basic ionic liquid%ethyl methyl carbonate%diethyl carbonate%transesterification
以碱性离子液体为催化剂，对碳酸二甲酯（DMC）和碳酸二乙酯（DEC）酯交换反应合成碳酸甲乙酯进行了研究．筛选出高催化活性的碱性离子液体1‐丁基‐3甲基咪唑丁酸盐（[C4 mim][CH3（CH2）2 COO]）为催化剂，详细考察了反应时间、温度、催化剂用量、原料配比等因素对酯交换反应的影响．实验结果表明，在反应温度为90℃，催化剂用量为6％（占反应物总质量百分数），n（DMC）∶ n（DEC）＝1．5∶1，反应时间为5 h 时，DEC 的转化率高达48％．[C4 mim][CH3（CH2）2 COO]重复利用5次后仍保持较高的催化活性．
以堿性離子液體為催化劑，對碳痠二甲酯（DMC）和碳痠二乙酯（DEC）酯交換反應閤成碳痠甲乙酯進行瞭研究．篩選齣高催化活性的堿性離子液體1‐丁基‐3甲基咪唑丁痠鹽（[C4 mim][CH3（CH2）2 COO]）為催化劑，詳細攷察瞭反應時間、溫度、催化劑用量、原料配比等因素對酯交換反應的影響．實驗結果錶明，在反應溫度為90℃，催化劑用量為6％（佔反應物總質量百分數），n（DMC）∶ n（DEC）＝1．5∶1，反應時間為5 h 時，DEC 的轉化率高達48％．[C4 mim][CH3（CH2）2 COO]重複利用5次後仍保持較高的催化活性．
이감성리자액체위최화제，대탄산이갑지（DMC）화탄산이을지（DEC）지교환반응합성탄산갑을지진행료연구．사선출고최화활성적감성리자액체1‐정기‐3갑기미서정산염（[C4 mim][CH3（CH2）2 COO]）위최화제，상세고찰료반응시간、온도、최화제용량、원료배비등인소대지교환반응적영향．실험결과표명，재반응온도위90℃，최화제용량위6％（점반응물총질량백분수），n（DMC）∶ n（DEC）＝1．5∶1，반응시간위5 h 시，DEC 적전화솔고체48％．[C4 mim][CH3（CH2）2 COO]중복이용5차후잉보지교고적최화활성．
The synthesis of ethyl methyl carbonate (EMC) by transesterification of dimethyl carbonate (DMC) and diethyl carbonate (DEC) in the presence of alkaline ionic liquids as cata‐lysts was studied ,in which alkaline ionic liquid 1‐butyl‐3‐methylimidazolium butyrate ([C4 mim][CH3 (CH2 )2 COO ]) was selected due to its good catalytic performance compared with other alkaline ionic liquids .The effects of reaction time ,temperature ,catalyst loading and mo‐lar ratio of reactants on the conversion of the DEC were examined .Under the suitable reaction conditions of reaction temperature 90 ℃ ,catalyst dosage 6% (based on the total mass of the re‐actants) ,n(DMC) ∶ n(DEC) = 1 .5 ∶ 1 ,reaction time 5 h ,the conversion of DEC was 48% . After alkaline ionic liquid [C4 mim ][CH3 (CH2 )2 COO ] was recovered and reused five times without obvious loss of its catalytic activity .
