二甲基双环氧乙烷环氧化低相对分子质量聚异丁烯

采用过硫酸氢钾复合盐(Oxone)/丙酮体系制备二甲基双环氧乙烷(DMD)环氧化LMPIB(低相对分子质量聚异丁烯)。探讨了反应体系中溶剂、n(Oxone)∶n(NaHCO3)比例、V(H2O)∶V(丙酮)比例、反应温度和反应时间等对产物的双键转化率、环氧值和环氧收率的影响。结果表明:采用单因素试验法优选出DMD环氧化LMPIB的适宜工艺条件是"0~5℃反应0.5 h→25℃反应1.5 h"、n(Oxone)∶n(NaHCO3)=1∶2.40和V(H2O)∶V(丙酮)=5∶4,即反应体系中水150 mL、丙酮120 mL、Oxone和NaHCO3分别为23.05 g和15.12 g;此时,环氧化LMPIB的环氧值0.138 8 mol/100 g、双键转化率62.68%和环氧收率67.10%。     

环氧化低分子聚丁二烯改性白炭黑在SBR中的应用

研究环氧化低相对分子质量反式聚丁二烯(ELMTPB)改性白炭黑在SBR中的应用效果。结果表明，环氧度为10．6％的ELMTPB改性白炭黑填充SBR硫化胶的综合性能较好；硅烷偶联剂Si69改性白炭黑对SBR硫化胶性能的改善效果明显优于ELMTPB改性白炭黑，且Si69用量为8份时，硫化胶拉伸强度和撕裂强度较高；在ELMTPB／Si69并用比不超过4／4时，所得SBR硫化胶拉伸强度和拉断伸长率优于Si69改性白炭黑填充SBR硫化胶；当Si69用量为4份且并用12份ELMTPB时，所得SBR硫化胶性能最佳，表现在300％定伸应力提高28％，拉伸强度提高38％，且拉伸强度和拉断伸长率超过8份Si69改性白炭黑填充SBR硫化胶。     

离子交换树脂催化酯化反应的研究

本文叙述了用强酸性阳离子交换树脂催化酯化反应的研究以及酯类香料合成工艺、工业化生产的意义。     

CO2+离子交换NaX分子筛催化苯乙烯环氧化

将5次固态交换制备的Co²⁺-NaX于500 ℃焙烧6 h,再进行一次固态交换制备高稳定性催化剂,ICP分析表明其Co²⁺含量为9.13%,高于5次固态交换Co²⁺-NaX的平衡Co²⁺含量（8.42%）。采用XRD、N₂吸附-脱附对催化剂进行表征,结果表明,分子筛离子交换后其骨架结构没有受到破坏,然而随交换进入分子筛Co²⁺含量增多,其有序性下降越明显。通过正交实验对该催化剂催化苯乙烯环氧化进行考察,确定了优化的反应条件：苯乙烯用量6 mL,催化剂1.0 g,溶剂48 mL,反应温度80 ℃,反应时间6 h。在此条件下,环氧苯乙烷平均收率为39.5%。采用该法制备催化剂其活性能够进一步提高,且重复使用活性保持不变。     

离子交换树脂催化法制备硬脂酸丁脂

硬脂酸丁脂是一种用途广泛的精细化工产品。它可以作为硝酸纤维素、乙基纤维素的增塑剂使用,也可以添加到涂料中用以改善漆膜的光泽性、耐水性、耐寒性及耐划痕性。目前国内该产品主要用于聚氯乙烯、聚苯乙烯等合     

离子交换树脂催化酯化研究进展

与传统的无机催化剂相比,离子交换树脂表现出良好的催化性能并且能回收再利用。本文简单介绍了离子交换树脂的种类,重点介绍了离子交换树催化剂在酯化反应中的应用进展。     

浅析离子交换树脂的处理与再生

0 引言 离子交换树脂是一种不溶性固体的多价酸或多价碱的高分子化合物,其结构表面上具有能与溶液中的阳离子或阴离子进行离子交换的一种基,它具有酸或碱的反应性能。树脂还具有耐磨、耐热以及耐化学浸蚀的性能。目前,在水泥化学分析中,广泛应用离子交换法测定水泥及石膏中SO_3,主要是交换CASO_4中的Ca~(2 ),而对Ca~(2 )的选择性好、离解度大、受酸效应影响较小的则为强酸性阳离子交换树脂。所以,操作中选择732苯乙稀型强酸性阳离     

离子交换树脂催化合成苯甲酸甲酯

对制备苯甲酸甲酯的树脂催化剂进行了研究,考察了催化剂种类、用量、原料物质的量比、反应时间、反应温度等对酯化收率的影响。结果表明,阴离子交换树脂有更好地催化性能,在IRA410氯型交换树脂催化作用下,苯甲酸酐用量5g,醇酸摩尔比10∶1,催化剂/苯甲酸酐质量比1∶5,105°C反应3.5h,酯化收率可达85.3%。     

离子交换树脂在工业催化中的应用

主要介绍了离子交换树脂的基本知识。重点介绍了离子交换树脂作为催化剂在工业催化中的应用,探讨了离子交换树脂作为工业催化剂在有机合成应用中的机理。     

低相对分子质量聚异丁烯热降解制备遥爪聚异丁烯

高温时将LMPIB[低Mn(数均相对分子质量)聚异丁烯]热降解,用黏数测定产物的Mn,用碘量法测定产物的双键含量,用红外光谱(FT-IR)法和核磁共振碳谱(13C-NMR)法分析产物的分子结构,并研究了反应条件对产物双键官能度的影响。结果表明:当温度≥285℃时,LMPIB降解并生成了不饱和β-末端双键,提高了LMPIB的双键官能度;经315℃反应1.00 h后,产物的双键官能度达到1.57,n(末端α-双键)∶n(末端β-双键)=1∶3,并得到含α-、β-末端双键的遥爪齐聚物与含β-末端双键的齐聚物的混合物,n(遥爪齐聚物)∶n(单官能度齐聚物)≈1∶2。     

Kinetics of in situ epoxidation of soybean oil in bulk catalyzed by ion exchange resin

The kinetics of the epoxidation of soybean oil in bulk by peracetic acid formed in situ, in the presence of an ion exchange resin as the catalyst, was studied. The proposed kinetic model takes into consideration two side reactions of the epoxy ring opening involving the formation of hydroxy acetate and hydroxyl groups as well as the reactions of the formation of the peracid and epoxy groups. The catalytic reaction of the peracetic acid formation was characterized by adsorption of only acetic acid and peracetic acid on the active catalyst sites, and irreversible surface reaction was the overall rate-determining step. Kinetic parameters were estimated by fitting experimental data using the Marquardt method. Good agreement between the calculated and experimental data indicated that the proposed kinetic model was correct. The effect of different reaction variables on epoxidation was also discussed. The conditions for obtaining optimal epoxide yield (91% conversion, 5.99% epoxide content in product) were found to be: 0.5 mole of glacial acetic acid and 1.1 mole of hydrogen peroxide (30% aqueous solution) per mole of ethylenic unsaturation, in the presence of 5 wt% of the ion exchange resin at 75°C, over the reaction period of 8 h.     

碱性离子交换树脂催化碳酸丙烯酯水解反应研究

本文研究了碱性离子交换树脂催化碳酸丙烯酯水解反应制备1,2-丙二醇.详细考察了催化剂种类及其用量、酯水比、反应温度与反应时间对碳酸丙烯酯水解反应的影响.在最佳反应条件下碳酸丙烯酯的转化率和1,2-丙二醇的选择性均大于99%;同时考察了最佳反应条件下催化剂的重复使用性.     

Liquid phase synthesis of methyl tert-butyl ether catalyzed by ion exchange resin

Synthesis of methyl tertiary butyl ether (MTBE) from methanol and isobutene was studied using macroporous cation exchange resin, Amberlyst 15 in the hydrogen form, as a catalyst in the temperature range of 313-328 K. The reaction was carried out in a batch reactor at a pressure of one atmosphere in the liquid phase. A high degree of agitation was maintained in order to eliminate film diffusion resistance. The effect of catalyst loading, catalyst particle size and reaction temperature on reaction rate were studied. The reaction rate increased with increase in catalyst concentration and reaction temperature. Resin particle size had virtually no effect on the rate under the experimental conditions. The reaction rate data were analysed using homogeneous kinetics and heterogeneous models based upon Langmuir-Hinshelwood rate expressions. The apparent activation energies using homogeneous and heterogeneous models were determined and found as 79.0 kJ/mol and 76.7 kJ/mol respectively.     

Kinetics of methyl tertiary butyl ether synthesis catalyzed by ion exchange resin

This paper presents the results of an experimental investigation of the kinetics of liquid phase reaction between methanol and isobutene, catalyzed by an acidic ion-exchange resin, to form methyl tertiary butyl ether (MTBE). A one litre Parr batch reactor was used. Experiments were carried out at 70, 80, 90 and 100°C and at pressures sufficient to maintain liquid phase at those temperatures. Initial methanol/isobutene mole ratios of 1.0 and 2.0 were used. The catalyst amount was also varied. These kinetic data were used to model the reaction kinetics, by non-linear least squares regression technique. The reaction was found to follow Rideal-Eley kinetics. The values of the rate constants are reported.     

改性离子交换树脂催化合成醋酸仲丁酯

采用几种金属离子和阳离子交换树脂反应,制备了不同的改性树脂催化剂,并考察了其催化活性。研究结果表明:分别以SnCl4、AlCl3和ZnCl2为改性剂制得的催化剂活性均较未改性树脂催化剂活性有较大的提高,其中以SnCl4为改性剂的效果最好,醋酸转化率由未改性的35%提高到70%左右。催化剂稳定性实验表明,随着反应次数的增加,醋酸转化率逐渐提高并趋于稳定,说明改性催化剂稳定性良好。     

胜利油田污水回注井管线腐蚀因素研究

针对胜利油田回注污水引起的管线腐蚀及结垢问题,通过对现场失效部位进行X射线衍射(XRD)及扫描电子显微镜(SEM)分析技术,探讨了管线腐蚀的可能性因素,通过室内静态挂片实验法,确定了回注污水引起管线腐蚀的主要原因。结果表明,溶解氧、二氧化碳、pH值、硫酸盐还原菌(SRB)及高矿化度离子组成是管线腐蚀的主要因素,造成腐蚀主要因素是高矿化度离子、碳酸钙结垢与溶解氧的协同作用。建议今后采取适当的加药措施及定期进行水质检测,减少结垢和细菌腐蚀的风险。     

阳离子交换树脂吸附Fe~(3 )催化合成乙酸丙酯的研究

本文研究了阳离子交换树脂吸附Fe3 的制备及其在合成乙酸丙酯反应中的催化作用 ,结果发现其具有较高的催化能力 ,乙酸丙酯的产率可达 76 %以上。     

阳离子交换树脂吸附Fe^3＋催化合成乙酸丙酯的研究

本文研究了阳离子交换树脂吸附Fe^3 的制备及其在合成乙酸丙酯反应中的催化作用，结果发现其具有较高的催化能力，乙酸丙酯的产率可达76％以上。