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Li‐Sheng Wang Xin‐Xin Wang Yi Li Kan Jiang Xian‐Zhao Shao Chao‐Jun Du 《American Institute of Chemical Engineers》2013,59(8):3034-3041
Ionic liquids (ILs) are innovative solvents for chemical processing. In this work, a database on activity coefficients of organic solutes at infinite dilution in ILs was collected from literature sources. The activity coefficients have been correlated by activity coefficient model for the regular solution and have been used to estimate the solubility parameter of ILs. The solubility parameters of ILs have been further correlated based on a concept of the group contribution method. Through the analysis of the database and the prediction results of selectivities, it was shown here that as compared with conventional organic solvents, higher selectivity can be achieved by using ILs as working solvents for separation of alkane/aromatic, aromatic/aromatic hydrocarbon mixtures via extraction or supported liquid membrane. © 2013 American Institute of Chemical Engineers AIChE J, 59: 3034–3041, 2013 相似文献
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The high pressure solubility of polyethylene standards (Mw = 2100, 16400, 108000 and 420000 and Mw/Mn = 1.14, 1.16, 1.32 and 2.66, respectively) in n-pentane has been studied. Concentrations of up to 15 wt% polymer have been investigated. For each polymer sample and concentration, pressures that are required to achieve single-phase solutions have been determined over a range of temperatures. The solutions are found to all show lower critical solution temperatures. Demixing pressures are observed to depend strongly on the molecular weight of the polymer. 相似文献
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溶解度参数的用途(英) 总被引:1,自引:0,他引:1
提供了溶解度参数的几种获取方法。论述了溶解度参数对配方师和化学家的重要性,以及它在产品配方、求HLB值、包装材料、选择防腐剂等方面的应用。溶解度参数可全部部分地反映所有物质的特性,它对保证和改善产品质量及其贷架寿命都有积极的指导意义。 相似文献
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An apparatus is described for measuring gas solubilities at high pressure for gases of moderate to high solubility. Solvent, supplied by a metering pump, is continuously saturated with gas as it flows down a spiral rod. Gas is continuously supplied by means of a calibrated piston pump to provide a constant pressure. The solubility is determined from the relation between the solvent rate and the gas consumption required to achieve saturation. The solubilities of two chemically reactive gases, propene and isobutene, are reported for the solvents n-butanol, chlorobenzene and n-octane for three temperaturres, 298, 323 and 343 K, and a range of pressures from 0.2 to 1.9 MPa. 相似文献
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变压吸附技术是工业上生产高纯氢气最常用的方法之一。然而,在实际生产过程中无法观察到塔内各组分在不同时刻的分布状态,因此借助模拟的手段来研究从投料至系统达到循环稳态期间各组分在塔内的动态变化规律,进而指导工艺改进是很有必要的。采用活性炭和5A分子筛为吸附剂,设计了八塔变压吸附工艺从蒸汽甲烷重整气中纯化氢气,模拟了变压吸附制氢开车过程,分析了开车过程中塔内各组分在吸附、顺放以及冲洗三个阶段以及循环稳态后吸附阶段瞬态吸附行为和塔内温度变化。结果表明,在吸附以及顺放等过程中重组分会随着循环周期向塔顶移动。这一现象是组分间竞争吸附和冲洗再生方式下重组分在床层底部累积两个作用因素共同导致的。这些因素在一定程度上也会造成CO的吸附前沿在吸附阶段就过多进入5A分子筛上,使得CO含量成为限制工艺性能的主要因素。 相似文献
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The solubility of hydrogen in a white mineral oil has been measured at pressures of 1.48 to 10.44 MPa at each of four temperatures (573, 603, 623, 643 K), in conjunction with a study of hydrodesulphurization in a trickle-bed reactor. The solubility varies from a hydrogen mole fraction of 0.056 at the lowest [T, P] to 0.262 at the highest. The solubility increases with increasing pressure and temperature. It can be represented by an equation suggested by using Krichevsky-Ilinskaya and van't Hoff expressions. 相似文献
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以杂萘联苯聚芳醚腈为研究对象,分别采用多种良溶剂和不良溶剂进行浊度滴定实验,由KY(Kumar and Yildirim)一阶算法对其产生的25个浊点数据进行最小体积闭包椭球拟合,从而确定椭球球心为三维溶解度参数(δd=17.50(MPa)1/2;δp=11.19(MPa)1/2;δH=10.96(MPa)1/2),椭球包围的区域为聚合物的溶解区域。采用THF作为鉴别溶剂,判定该拟合结果精确可靠。三维溶解度参数方法操作简便,计算简单、选用溶剂少,对聚合物溶剂的选择具有重要的指导意义。 相似文献
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通过对微型制氧流程的实验研究和分析,确定了单节流小流量反吹和均压工艺的最佳实验参数,在保证产氧浓度和氧气最大回收率的条件下,该工艺流程吸附压力最低。结果表明:小流量反吹工艺可以提高产品气中氧气浓度(体积分数),吸附塔出口端单向阀可以有效降低吸附压力;双节流反吹工艺虽然可以提高产品气中氧气浓度,但节流孔径限制了产品氧气输出,导致吸附压力升高;单节流小流量反吹工艺和均压工艺中均压时间与瞬洗时间均存在最佳值。 相似文献
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分析了目前加氢裂化装置空冷器普遍存在的管束结垢的原因;在垢物成分分析的基础上。有针对性地研制了NBT-3型专用清洗剂,配合优化后的清洗工艺,在实际应用中取得了满意的效果。目前此清洗技术已在多套加氩裂化装置得到成功应用。 相似文献
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为选择含高体积分数CO净化黄磷尾气变换制氢最佳工艺条件,对影响其变换率的反应温度、空速、汽气体积分数比、CO2体积分数几个主要因素进行了综合研究。采用均匀设计方法,以B112型高温变换催化剂为例,对含高体积分数CO净化黄磷尾气变换工艺条件进行了系统研究。研究结果表明:影响其变换效率的因素由大到小依次为反应温度、空速、汽气体积分数比、CO2体积分数;通过模型优化及实验验证,结合工业实际,得到优化的工艺条件为反应温度490℃,空速为1 000 h-1,汽气体积分数比为2.5,CO2体积分数为1%,可得CO变换率为88.9%;回归方程模型高度显著可信。 相似文献
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叙述了在温度155~175℃,14 MPa压力下使用的绝缘胶接体系研究情况,实物电子线圈8中线与线间绝缘电阻值、线与屏蔽层间绝缘电阻值都大于10Ω,该体系已应用在石油测井仪。 相似文献
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考察了高压均质提取柴达木枸杞叶有效成分的最佳工艺及对有效成分进行了纯化。在乙醇浓度、料液比、均质压力及提取时间四个单因素实验的基础上利用正交设计对实验进行优化,得出高压均质提取法的最佳工艺条件为:乙醇浓度80%,料液比1:10,均质压力60MPa,提取时间30min,在此条件下,提取物中芦丁含量为10.53%,总黄酮含量为32.61%。分离纯化工艺为:选用AB-8大孔树脂,水洗脱用量5BV,乙醇洗脱用量4BV,经纯化后的产物中,芦丁含量可达60.85%,总黄酮含量可达90.53%。 相似文献