共查询到19条相似文献,搜索用时 512 毫秒
1.
2.
3.
4.
《精细化工原料及中间体》2006,(2):47-48
三乙烯二胺(TEDA)又称三乙撑二胺。可以从哌嗪、N-氨乙基哌嗪、N-羟乙基哌嗪和乙二胺等原料出发进行合成。但是,工业上用哌嗪、N-氨乙基哌嗪和N-羟乙基哌嗪为原料合成三乙烯二胺存在原料稀缺和成本高的问题,而用乙二胺为原料生产三乙烯二胺则存在环境污染严重的问题。 相似文献
5.
用Aspen Plus软件对乙二胺(EDA)合成三乙烯二胺(TEDA)体系中涉及到的主要化合物的热力学参数进行估算,并对涉及到的主、副反应的焓变、吉布斯自由能变和平衡常数随温度的变化进行了计算。以氯化钾为前驱体,用离子交换法改性HZSM-5制备KZSM-5催化剂,通过XRD,吡啶吸附红外光谱(Py-IR)表征,KZSM-5没有氯化钾晶体生成,骨架B酸位消失,L酸位变丰富。在温度340℃常压下,进料浓度5. 90 mol/L,停留时间88. 06 min下,原料转化率和三乙烯二胺的选择性分别为85%和51%。对催化机理进行分析,气相主体的乙二胺分子进入KZSM-5孔道,被K~+活化生成二乙烯三胺,经分子内环合生成哌嗪。哌嗪从分子筛孔道中脱附进入气相主体在瓷环层与乙二胺反应生成三乙烯二胺。 相似文献
6.
7.
8.
9.
在确定气固相合成无水哌嗪的最佳工艺条件、筛选出最佳催化剂活性组分、确定催化剂制备的最佳工艺条件后,为了进一步研究中试放大,需对在确定工艺条件及所采用催化剂的结构和粒径的条件下催化合成无水哌嗪的宏观动力学进行研究。实验采用改性后的ZSM-5分子筛Φ2 mm×2 mm柱状催化剂,以工业品乙二胺(EDA)为原料,选用平推流反应器,气固相催化法合成无水哌嗪和副产物三乙烯二胺。在350—370℃下,建立了合成无水哌嗪和三乙烯二胺的宏观动力学模型。此模型的建立可以指导中试放大和工业化生产。 相似文献
10.
11.
聚环氧氯丙烷胺的制备及其脱色性能 总被引:8,自引:0,他引:8
以环氧氯丙烷和二甲胺为原料,加入交联剂乙二胺制得了一系列有机阳离子聚合物,研究了乙二胺加入量、反应温度、环氧氯丙烷和二甲胺摩尔比、聚合时间等对产品黏度的影响。利用红外光谱,1HNMR和13CNMR对聚合物的结构进行了表征。并对模拟染料废水和实际印染废水进行了脱色效果实验。结果表明,反应温度为70℃,n(环氧氯丙烷)/n(二甲胺)=1.5,n(乙二胺)/n(环氧氯丙烷+二甲胺)=0.03,反应时间7 h时,聚合物黏度最大达750 mPa.s,对实际印染废水的脱色率达75%。 相似文献
12.
Adriana Barsanescu Rodica Buhaceanu Viorica Dulman I. Bunia Violeta Neagu 《应用聚合物科学杂志》2004,93(2):803-808
Adsorption of Zn(II) ions from diluted aqueous solutions by the acrylic copolymer based on ethylacrylate : acrylonitrile : divinylbenzene matrix with different crosslinking degrees and ethylenediamine and triethylenetetramine functional groups was investigated. Adsorption experiments were carried out by batch method. The effects of the pH, initial concentration of zinc, time of contact, and the crosslinking degree of the copolymers were studied. On the basis of Langmuir and Freundlich isotherms, the parameters that characterize the adsorption were determined. The maximum Zn(II) retention capacity value (500 mg g?1) was obtained for the acrylic copolymer with 2% crosslinking degree and ethylenediamine, as functional groups. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 803–808, 2004 相似文献
13.
Krishnamoorthy Jayaraman David Velayutham Ramanujam Kanakam Srinivasan Sankaranarayanan Chidambaram 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2003,78(6):626-631
An industrial solution of ethylenediamine hydrochloride which contains about 18% chloride and 12% amine was electrodialysed in a five‐compartment cell to obtain pure ethylenediamine. Different parameters such as alkali concentration and current density were studied to optimise conditions of maximum current efficiency for amine recovery and chloride removal from the feed solution. The Suitabilities of different ion‐exchange membranes for electrodialysis were compared. Variation in current efficiency for amine recovery with increases in the concentration of amine during electrodialysis was also studied. Current efficiency for amine recovery and chloride removal is about 78% and 91% respectively under optimum conditions. The amount of electrical energy consumed is 12.1 kWh kg?1 for ethylenediamine recovery and 8.6 kWh kg?1 for chloride removal. The concentration of pure amine obtained after the electrodialysis was around 20%. The results are encouraging for industrial applications whereby ethylenediamines free from chlorides can be isolated. Copyright © 2003 Society of Chemical Industry 相似文献
14.
由乙二胺和对甲苯磺酰氯反应制得N,N′-双(对甲苯磺酰基)乙二胺。此步最佳工艺条件为:n(对甲苯磺酰氯)∶n(乙二胺)=2.2∶1,反应溶剂为苯,反应温度为40~45℃,反应时间为6h,收率80%。由丙烯酸甲酯和溴反应制得α,β-二溴丙酸甲酯,收率为88%。再由上述二种中间体反应合成标题化合物,此步省略了N,N′-双(对甲苯磺酰基)乙二胺的二钠盐制备,收率为73%。 相似文献
15.
It was found that platinized-platinum ethylenediamine (EDA) is extremely selective (ca 93%) for the partial hydrogenation of 1,3-butadiene, given three isomeric butenes in a ratio of 1-butene: trans-2-butene: cis-2-butene = 13.2:2.5:1. Such a highly selective partial hydrogenation would be due to a specific adsorption of EDA on pt-Pt giving rise to the replacement of the adsorbed butenes which were formed from the partial hydrogenation of 1,3-butadiene. 相似文献
16.
以乙二胺和环氧乙烷为原料,在具有特殊微结构的连续流微反应器内发生乙氧基化反应合成羟乙基乙二胺。考察了原料物质的量比、乙二胺含水量、反应温度、停留时间等对反应的影响。确定了最佳工艺条件为:n(乙二胺) : n(环氧乙烷) = 3:1、乙二胺含水量控制在5%(质量分数)以内、反应温度为80 ℃、停留时间为60 s。在此条件下,环氧乙烷转化率接近100%,羟乙基乙二胺的选择性为87.4%,二羟乙基乙二胺的选择性为9.2%。间歇釜式反应工艺在相同物料比和反应温度条件下,羟乙基乙二胺的选择性为83.5%,二羟乙基乙二胺的选择性为15.9%,与之相比,连续流微反应器能有效提高羟乙基乙二胺的选择性,降低副反应的发生,同时大大缩短了反应时间,提高了反应效率。 相似文献
17.
18.
以自制1,4-二羟基丁烷-2-磺酸钠为亲水单体,聚己二酸己二醇新戊二醇酯(PHNA)、异佛尔酮二异氰酸酯(IPDI)、1,4-丁二醇(BDO)和乙二胺(EDA)为原料,采用丙酮法合成了固含量超过50%的PUD(聚氨酯分散体)。研究结果表明:PUD胶膜的断裂伸长率超过1 500%、最大拉伸强度为47.3 MPa,具有高强度、高弹性之特点;PUD胶膜具有良好的热稳定性(起始分解温度超过280℃,490℃完全分解)和耐水性(吸水率低于10%)。 相似文献
19.
Vijay Kale H. Sumathi Vedanayagam K. Sita Devi S. Venkob Rao G. Lakshminarayana M. Bhagwant Rao 《应用聚合物科学杂志》1988,36(7):1517-1524
Kinetic studies were carried out on the reaction between ethylenediamine and dimeric fatty acids in melt phase. The reaction was performed at 124, 130, 145, 160, 174, and 190°C and followed by determining the acid value of the product. The polyamidation reaction was found to be of overall second order with an activation energy of 18.2 kcal/g mol up to 90% conversion and of overall third order with an activation energy of 16.4 kcal/g mol above 90% conversion. 相似文献