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1.
双阳离子型离子液体的合成与性能   总被引:2,自引:0,他引:2  
以N-甲基咪唑、吡啶和二溴代烷为原料合成了一系列α,ω-亚烷基-双(N-甲基咪唑)型和α,ω-亚烷基-双(吡啶)型离子液体,并对其结构、熔点、溶解性、吸湿性和热性能分别进行了表征.结果表明,随着连接两个阳离子联接基的碳氢链长度的增加,离子液体的熔点先降低后升高,联接基的碳氢链长度为5个碳原子时最低;α,ω-亚烷基-双(N-甲基咪唑)型离子液体的熔点低于α,ω-亚烷基-双(吡啶)型离子液体;双阳离子溴盐型离子液体溶于水,双阳离子六氟磷酸盐型离子液体溶于丙酮和乙腈等;双阳离子溴盐型离子液体有一定的吸湿性,所合成的双阳离子型离子液体具有较高的热稳定性.  相似文献   

2.
以溴代或氯代醇或酯和吡啶为原料合成三个离子液体前体即溴化N-羟乙基吡啶、氯化N-羟己基毗啶和N-甲氧羰乙基吡啶氯代盐;分别将它们与四氟硼酸钠进行复分解反应得到相应的离子液体即N-羟乙基毗啶四氟硼酸盐、N-羟己基毗啶四氟硼酸盐和N-甲氧羰乙基毗啶四氟硼酸盐。利用核磁共振波谱对三个离子液体进行了表征。  相似文献   

3.
从离子液体用作纤维素溶剂的优势出发,介绍了已工业化的离子液体纤维素材料项目,详细综述了离子液体用于再生纤维素纤维、再生纤维素膜和纤维素复合材料的工业化进展,比较了1-烯丙基-3-甲基咪唑氯盐、1-乙基-3-甲基咪唑醋酸盐、四丁基醋酸铵等离子液体在工业上使用的可行性,分析了溶剂用离子液体工艺上的难点并提出优化对策,最后展望了纤维素溶剂用离子液体的发展。  相似文献   

4.
以N-甲基咪唑和溴乙烷为原料,合成中间体[Emim]Br,讨论原料配比、溶剂、反应时间和反应温度对[Emim]Br产率的影响,最高产率为94.63%。四氟硼酸钠与中间体[Emim]Br以等摩尔比进行反应,确定最优的合成条件,在最佳合成条件下目标离子液体的转化率为94.45%。浊点法测定溶解度表明甲苯等溶剂在[Emim]BF4离子液体中有较好的溶解性能。  相似文献   

5.
王赟  高丹  梁都 《广州化工》2011,39(15):81-83
以溴乙烷和N-甲基咪唑为原料合成了中间体溴化1-乙基-3-甲基咪唑,以中间体与NaBF4进行复分解反应制备了离子液体1-乙基-3-甲基咪唑四氟硼酸盐。探讨了投料比、反应时间、反应温度对中间体和1-乙基-3-甲基咪唑四氟硼酸盐产率的影响,确定了最佳合成条件。在此工艺条件下,1-乙基-3-甲基咪唑四氟硼酸盐产率可达94%以上。  相似文献   

6.
利用静态吸收法研究了体系温度、初始压强和离子液体质量分数对亲水性离子液体1-氨丙基-3-甲基咪唑溴盐[1-NH2-C3mim][Br]吸收CO2的影响。优化的吸收工艺条件为:离子液体的质量分数50%,体系温度303.15 K,体系初始压强为165.64 kPa。同时,文中摸索了吸收剂的"两段式"真空再生条件,第1段再生温度321.15 K,30min,第2段再生温度343.15 K,10 min,结果表明:该离子液体吸收CO2吸收效果良好,并且再生后的离子液体,吸收性能稳定不变,可反复使用。  相似文献   

7.
《应用化工》2019,(11):2542-2545
以N-乙烯基咪唑、溴代十六烷为原料,经亲核取代反应合成溴化1-十六烷基-3-乙烯基咪唑([HDVIM]Br)离子液体。并以该离子液体为单体,偶氮二异丁腈(AIBN)为引发剂,制备聚离子液体p[HDVIM]Br。采用红外光谱(FTIR)、核磁共振仪(~1H NMR)和元素分析、凝胶色谱仪(GPC)、热重分析仪(TGA)、X-射线衍射仪(XRD)及电导率对其进行结构与性能测试与分析。结果表明,[HDVIM]Br具有可聚性,且为无定形非晶结构。[HDVIM]Br的电导率随温度升高逐渐增大,随着浓度增加而增加;溴化1-十六烷基-3-乙烯基咪唑离子液体聚合物p([HDVIM]Br)的数均分子量为3.68×10~4 g/mol。  相似文献   

8.
《应用化工》2022,(11):2542-2545
以N-乙烯基咪唑、溴代十六烷为原料,经亲核取代反应合成溴化1-十六烷基-3-乙烯基咪唑([HDVIM]Br)离子液体。并以该离子液体为单体,偶氮二异丁腈(AIBN)为引发剂,制备聚离子液体p[HDVIM]Br。采用红外光谱(FTIR)、核磁共振仪(1H NMR)和元素分析、凝胶色谱仪(GPC)、热重分析仪(TGA)、X-射线衍射仪(XRD)及电导率对其进行结构与性能测试与分析。结果表明,[HDVIM]Br具有可聚性,且为无定形非晶结构。[HDVIM]Br的电导率随温度升高逐渐增大,随着浓度增加而增加;溴化1-十六烷基-3-乙烯基咪唑离子液体聚合物p([HDVIM]Br)的数均分子量为3.68×101H NMR)和元素分析、凝胶色谱仪(GPC)、热重分析仪(TGA)、X-射线衍射仪(XRD)及电导率对其进行结构与性能测试与分析。结果表明,[HDVIM]Br具有可聚性,且为无定形非晶结构。[HDVIM]Br的电导率随温度升高逐渐增大,随着浓度增加而增加;溴化1-十六烷基-3-乙烯基咪唑离子液体聚合物p([HDVIM]Br)的数均分子量为3.68×104 g/mol。  相似文献   

9.
考察离子液体溴化-1-乙基-3-甲基咪唑([emim]Br)作为提取溶剂对中草药中白桦脂酸衍生物的提取特性,并找到最佳提取条件。以中草药皂角刺为原料,以离子液体溴化-1-乙基-3-甲基咪唑为提取溶剂,选取提取温度、提取时间和液固比3个因素,进行正交试验,考察提取得率,并与乙醇回流提取方式作对比,找到离子液体提取最佳条件。结果表明:乙醇回流提取对目标成分的提取得率为0.050%,离子液体溴化-1-乙基-3-甲基咪唑在不同条件下对目标成分的提取得率为0.079%—0.107%。在室温(25℃)、液固比30∶1、提取时间2 h的条件下离子液体对目标成分的提取得率为0.105%。离子液体溴化-1-乙基-3-甲基咪唑对中草药皂角刺中白桦脂酸衍生物的提取得率明显高于乙醇回流提取方式的提取得率,最佳提取条件为室温(25℃)、液固比30∶1,提取时间2h。  相似文献   

10.
张海龙  李梦耀  王娜 《应用化工》2013,(10):1866-1869
以N-甲基咪唑和1-溴丁烷为原料,两步合成法合成碱性离子液体[Bmim]OH。考察了反应物摩尔比、反应温度、反应时间对碱性离子液体中间体产率的影响,碱化配比、碱化时间对碱性离子液体产率的影响。结果表明,合成碱性离子液体中间体的最佳条件为:反应温度70℃,反应时间20 h,物料比为1.2∶1,此时中间体产率最高,为92.64%;由中间体合成离子液体的最佳条件为:碱化时间为10 h,碱化配比为1.3∶1,此时碱性离子液体产率最高,为54.98%。用紫外光谱、红外光谱等对碱性离子液体的结构进行了表征和分析。  相似文献   

11.
溴代正丁烷的绿色合成   总被引:2,自引:0,他引:2  
以溴化钾、正丁醇为反应原料,水为溶剂,滴加浓硫酸合成溴代正丁烷。考察了反应条件对产率的影响,结果表明在溴化钾0.1 mol、正丁醇0.07 mol、浓硫酸5 mL、水2.5 mL,回流反应3 h条件下,产率为96.3%。该方法废液后处理简单,排放无污染。粗产品经气相色谱分析证明几乎不含副产物,对产品进行了密度及折光率测定、红外表征。  相似文献   

12.
An intensified process for carbon dioxide capture and conversion is proposed and analyzed, considering an electrochemical parallel plate reactor which processes a CO2-charged stream from an absorption unit at 40 °C and atmospheric pressure and where the target product of the conversion is methanol.The task-specific ionic liquid 1-(3-aminopropyl)-3-methylimidazolium bromide was selected, synthesized and characterized. This ionic liquid has shown a good absorption capacity, high ionic conductivity, high chemical–electrochemical stability and acts as a charged intermediate (CO2*−) stabilizer, enabling the electrochemical reduction of absorbed CO2.The electrical energy in the electrochemical reactor was estimated to be 8.683 kWh kg (CO2)−1 or 115.16 g (CO2) kWh−1, too high to ensure the environmental sustainability of the process. A low concentration of carbon dioxide in the liquid phase, at ambient conditions, implies the need for a high electrode area for the process and is a major hindrance to improving the economy of the process.  相似文献   

13.
刘红霞  徐群 《化学世界》2008,49(2):101-102,81,92
微波法合成溴化1-丁基-3-甲基咪唑,通过正交试验,对微波反应条件进行优化研究。考察原料配比、微波照射时间、微波功率对该反应的影响。结果表明:该反应以1∶1.3原料摩尔比、在200 W微波功率下照射180 s为较佳的微波反应条件,收率可达98.9%。  相似文献   

14.
The use of carbon dioxide in the synthesis of ionic liquids (ILs) has many advantages over conventional solvents. Here, the high-pressure phase equilibria (including CO2 solubility, volume expansion, and mixture critical points) are measured and modeled for the system involved in the synthesis of a model imidazolium ionic liquid 1-hexyl-3-methylimidazolium bromide ([HMIm][Br]) from 1-bromohexane and 1-methylimidazole. The global phase behavior of 1-methylimidazole was investigated and found to be a Type V system (or potentially IV) from the classification of Scott and van Konynenburg with regions of vapor–liquid equilibrium, vapor–liquid–liquid equilibrium, liquid–liquid equilibrium, an upper and lower critical endpoint and mixture critical points. The solubility and volume expansion of CO2 in 1-methylimidazole, 1-bromohexane, a 1:1 mixture of 1-methylimidazole and 1-bromohexane and [HMIm][Br] was determined at 313.15 K and 333.15 K for pressures ranging from 10 to 160 bar. The solubility of CO2 and the volume expansion increases in the order of [HMIm][Br]  1-methylimidazole < 1:1 mixture of reactants < 1-bromohexane. The Peng–Robinson equation of state with van der Waals 2-parameter mixing rules was used with estimated critical properties to well correlate the vapor–liquid equilibrium. The results have important ramifications on the kinetics and process constraints of an actual IL synthesis with CO2.  相似文献   

15.
建立了化妆品中西曲溴铵的高效液相色谱(HPLC)分离检测方法。采用ZORBAX SB C18反相色谱柱(150 mm×4.6 mm,5μm),流动相为甲醇-0.1 M NaClO4溶液(pH 3.0)(70/30,体积比),采用等度洗脱方式,检测波长为208 nm,流速0.7 mL/min,以保留时间定性,外标法定量。结果表明,在此条件下西曲溴铵在1.25~200μg/mL范围内线性良好,检出限为0.35μg/mL,不同类型淋洗类化妆品中西曲溴铵的平均回收率在82.0%~118.7%范围内。方法操作简便,分离速度快,检出限低,适用于化妆品中西曲溴铵的测定。  相似文献   

16.
对比了液氯中溴含量的测定方法,详细介绍了电感耦合等离子体分光光度ICP-AES法测定液氯中的溴含量及效果。  相似文献   

17.
In order to improve the selectivity of allyl phenyl ether (ROPh), the main product, in the etherification of allyl bromide (RBr) and sodium phenolate (NaOPh) with tetra-n-butylammonium bromide (QBr) as a phase-transfer catalyst, the technique of tri-liquid-phase phase-transfer catalysis, instead of the liquid-liquid one, was employed. The reaction was performed in a batch reactor, and the factors affecting the conversion and selectivity were investigated. The possibility of reusing the phase-transfer catalyst was also evaluated. Experimental results indicate that the addition of a small amount of Na2CO3 will benefit the formation of a third liquid phase and enhances both the conversion of RBr and the overall yield of ROPh. Both the conversion and the overall yield are maximal when the mole fraction of QBr in the mixture of NaOPh and QBr is about 0.3. A high reaction temperature enhances the conversion and the overall yield. Under optimal conditions, complete conversion and near 100% yield can be obtained within 10 minutes. Although the reaction rate by the tri-liquid-phase catalysis is slightly lower than that observed with the same amount of catalyst by conventional liquid-liquid phase-transfer catalysis, the selectivity of ROPh is higher and the catalyst can be easily reused by the reuse of the third liquid phase without any loss of its catalytic activity in the former case. Because the reuse of catalyst was found to be feasible, the production of ROPh with a continuous-flow reactor becomes possible.  相似文献   

18.
In order to improve the selectivity of allyl phenyl ether (ROPh), the main product, in the etherification of allyl bromide (RBr) and sodium phenolate (NaOPh) with tetra-n-butylammonium bromide (QBr) as a phase-transfer catalyst, the technique of tri-liquid-phase phase-transfer catalysis, instead of the liquid-liquid one, was employed. The reaction was performed in a batch reactor, and the factors affecting the conversion and selectivity were investigated. The possibility of reusing the phase-transfer catalyst was also evaluated. Experimental results indicate that the addition of a small amount of Na2CO3 will benefit the formation of a third liquid phase and enhances both the conversion of RBr and the overall yield of ROPh. Both the conversion and the overall yield are maximal when the mole fraction of QBr in the mixture of NaOPh and QBr is about 0.3. A high reaction temperature enhances the conversion and the overall yield. Under optimal conditions, complete conversion and near 100% yield can be obtained within 10 minutes. Although the reaction rate by the tri-liquid-phase catalysis is slightly lower than that observed with the same amount of catalyst by conventional liquid-liquid phase-transfer catalysis, the selectivity of ROPh is higher and the catalyst can be easily reused by the reuse of the third liquid phase without any loss of its catalytic activity in the former case. Because the reuse of catalyst was found to be feasible, the production of ROPh with a continuous-flow reactor becomes possible.  相似文献   

19.
N,N-二甲基二茂铁基甲胺分别与溴代辛烷、溴代十二烷、溴代十四烷和溴代十六烷反应,合成了4种二茂铁表面活性剂:N,N-二甲基二茂铁甲基辛烷基溴化铵(Fc8)、N,N-二甲基二茂铁甲基十二烷基溴化铵(Fc12)、N,N-二甲基二茂铁甲基十四烷基溴化铵(Fc14)和N,N-二甲基二茂铁甲基十六烷基溴化铵(Fc16)1。HNMR与元素分析结果表明,Fc8、Fc12、Fc14和Fc16的分子结构与理论结构吻合,质量分数96%;分别测定了4种化合物在还原态(I+)和氧化态(I2+)的表面张力,结果表明,该化合物在还原态具有良好的表面活性,其临界胶束浓度分别为5.92、0.67、0.46和0.07 mmol/L,仅为相应的直链季铵盐阳离子表面活性剂CMC值的1/40、1/25、1/5和1/15;而在氧化态时表面活性不明显。通过该化合物在氧化态和还原态的表面张力曲线的对比,表明该化合物具有良好的可逆变化能力。因而,可以调节化合物所处的氧化态或还原态,控制其表面活性。  相似文献   

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