共查询到19条相似文献,搜索用时 78 毫秒
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在实验测定乙二醇单叔丁醚(TMBE)与乙二醇二叔丁醚(TDBE)相平衡数据的基础上,回归得到了Wilson方程的相互作用参数Λ12和Λ21,并利用回归参数的Wilson方程预测了TMBE和TDBE共沸组成随压力降低,TMBE的摩尔分数降低。根据此特性,文中设计了利用差压精馏分离TMBE和TDBE的流程,并在Pro/II流程模拟软件上,建立了差压精馏分离TMBE和TDBE的模型并进行了模拟计算。模拟结果表明:利用差压精馏可分别获得纯度(摩尔分数)大于99%以上的TMBE和TDBE。 相似文献
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采用活性阴离子聚合方法,以四氢呋喃(THF)/环己烷(CYX)为溶剂、正丁基锂为引发剂,苯乙烯与4-叔丁氧基苯乙烯为单体合成4-叔丁氧基苯乙烯-苯乙烯共聚物,并表征了其结构与性能。结果表明:-78℃,THF为溶剂时,4-叔丁氧基苯乙烯-苯乙烯共聚物相对分子质量分布指数(PDI)为1.23,共聚过程中4-叔丁氧基苯乙烯活性高于苯乙烯;m(THF)∶m(CYX)=5∶5的THF/CYX为溶剂,-30℃下所得4-叔丁氧基苯乙烯-苯乙烯共聚物的PDI为1.10,相对分子质量分布更窄且有利于降低聚合成本;4-叔丁氧基苯乙烯-苯乙烯共聚物的玻璃化转变温度(tg)均低于4-叔丁氧基苯乙烯均聚物,4-叔丁氧基苯乙烯含量越高,4-叔丁氧基苯乙烯-苯乙烯共聚物的tg越高。 相似文献
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含2—甲基丁烷,甲醇,甲基叔戊基醚体系汽液平衡的测定 总被引:1,自引:0,他引:1
含2-甲基丁烷、甲醇、甲基叔戊基醚体系汽液平衡的测定秦金平钱仁渊云志李志宝史美仁(南京化工大学化工分离研究所,南京210009)关键词2-甲基丁烷甲醇甲基叔戊基醚汽液平衡1前言随着对汽油的质量要求越来越高,对无铅汽油抗爆剂进行的研究发现,醚类物质是... 相似文献
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叔丁酚类的性质,用途及合成 总被引:1,自引:0,他引:1
本文综述了由酚类进行叔丁基化后得到的一系列叔丁酚的性质和用途,包括对叔丁基苯酚、2,6-二叔丁基对甲苯酚、对叔丁基邻苯二酚、2,4-二叔丁基苯酚、2,6-二叔丁基苯酚及3-甲基-6-叔丁基苯酚等6种化合物。对了解它们在化学过程中的重要性具有一定的参考意义。 相似文献
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无醇甲基叔丁基醚的实验室制备 总被引:1,自引:0,他引:1
用甲醇和叔丁醇在稀硫酸催化下脱水得甲基叔丁基醚粗产物,经反复水洗后干燥,再经金属钠回流除去微量水分及甲醇后,蒸馏得到无醇甲基叔丁基醚。 相似文献
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Alkylation of phenol was carried out using methyl tert-butyl ether, mono tert-butyl ether of mono ethylene glycol, tert-butanol and isobutylene in the presence of cation exchange resins, acid treated clay and para-toluene sulfonic acid as catalysts. The selectivity with respect to 2- and 4-tert-butyl phenol was studied. 相似文献
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The simultaneous etherification of isobutene and isoamylenes with ethanol has been studied using macroreticular acid ion-exchange resins as catalyst. Most of the experiments were carried out over Amberlyst-35. In addition, Amberlyst-15 and Purolite CT-275 were also tested. Chemical equilibrium of four chemical reactions was studied: ethyl tert-butyl ether formation, tert-amyl ethyl ether formation from isoamylenes (2-methyl-1-butene and 2-methyl-2-butene) and isomerization reaction between both isoamylenes. Equilibrium data were obtained in a batchwise stirred tank reactor operated at 2.0 MPa and within the temperature range from 323 to 353 K. Experimental molar standard enthalpy and entropy changes of reaction were determined for each reaction. From these data, the molar enthalpy change of formation of ethyl tert-butyl ether and tert-amyl ethyl ether were estimated. Besides, the chemical equilibrium between both diisobutene dimers, 2,4,4-trimethyl-1-pentene and 2,4,4-trimethyl-2-pentene, was evaluated. A good agreement between thermodynamic results for the simultaneous etherification carried out in this work and those obtained for the isolated ethyl tert-butyl ether and tert-amyl ethyl ether systems was obtained. 相似文献
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采用液相本体聚合法考察了原料丙烯中的微量液态杂质对NG和DQ催化剂聚合性能的影响。结果表明,异丙醇、丙醛和甲基叔丁基醚对丙烯聚合催化剂影响不同。其中,异丙醇和丙醛主要影响NG和DQ催化剂的聚合活性,甲基叔丁基醚对活性影响不明显。3种液态含氧杂质对NG和DQ催化剂的定向能力的影响有区别,但总体影响不显著。工业生产中,应控制3种杂质含量低于60×10-6,以保证催化剂有优良的活性和较高等规度的聚丙烯产物。含氧液态化合物杂质对NG催化剂聚合活性的影响顺序为:异丙醇甲基叔丁基醚丙醛;对DQ催化剂聚合活性的影响顺序为:丙醛异丙醇甲基叔丁基醚。 相似文献
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根据测定1-丁烯中微量甲基叔丁基醚和甲醇的分析方法中存在的问题,分别对进样方式、毛细管色谱柱和仪器操作条件作了改进,建立了一次进样便可同时检测甲基叔丁基醚和甲醇的气相色谱法。改进后的方法操作简便,分离效果及重复性良好。 相似文献
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The aim of this work was to study the reaction of ozone and combined ozone/hydrogen peroxide on oxygenated additives such as methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE) in dilute aqueous solution using controlled experimental conditions. Experiments conducted in a semi-continuous reactor with MTBE and ETBE in combination (initial concentration: 2 mmol/L of each) showed that ETBE was better eliminated than MTBE with both ozone and combined O3/H2O2. Batch experiments led to the determination of the ratio of the kinetic constants for the reaction of OH°-radical with MTBE and ETBE [kOH°/ETBE/kOH°/MTBE = 1.7). Tert-butyl formate and tert-butyl acetate were identified as the ozonation byproducts of MTBE and ETBE, respectively, while tert-butyl alcohol was found to be produced during the ozonation of both compounds. 相似文献