共查询到20条相似文献,搜索用时 46 毫秒
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<正>"工欲善其事,必先利其器。"这是紫砂泰斗顾景舟一生中,说得最多的一句话。"工欲善其事,必先利其器。"这是紫砂泰斗顾景舟一生中,说得最多的一句话。顾景舟把自己的制壶工具拿出来,摆成长长一列,像冷兵器时代的战具,完全可以当工艺品来欣赏。他有一把德国造的"什锦锉子"。小巧、灵便、锋利。这是他当年在上海买的,非常好用。关于工具,顾景舟说,每个人不必完全一样。因为,各人的手势、力气、习惯不一样。但有一点,必须一样,那就是,得用。"得用"是一句宜兴方言。得,得手、顺劲、应心;用,不仅要好用,还要耐用。 相似文献
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《香行子.忆岁月》斗转星移,荏苒时光。忆岁月思绪迴荡。启蒙培才,一中成长。入高学府,学业奋,图自强。奔赴巴蜀,几经磨难。沐风雨意志更刚。乌云乍开,霞光万丈。饮欢庆酒,杯中泪,语中狂。返还津城,终回故乡。赴伊国重任担当。荒漠深处,现代工厂。恁技术难,生活苦,常思乡。走入仕途,人民为上。切不可怠慢松放。 相似文献
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张育川 《精细与专用化学品》2003,11(23):22-23
与丁二醇的其它异构体 1,3 丁二醇和 1,4 丁二醇相比 ,1,2 丁二醇的粘度和凝固点特别低。为了充分发挥 1,2 丁二醇的优势 ,其新开发的用途已经有用做生产聚氨酯的聚酯多元醇、生产不饱和聚酯类树脂、用做聚酯类增塑剂以及作为化妆品的保湿剂、农药稳定剂、医药、农药等其它精细化学品的生产原料。 2 0 0 1年日本神户工厂的产量为 2 0 0t,本文还介绍了 1,2 丁二醇的发展前景。 相似文献
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The synthesis of 1,2 dilinoleoylsn-3-glycerophosphorylcholine (1,2-18∶2-sn-3-GPC) and 1,2 dipalmitoylsn-3-glycerophosphorylcholine (1,2-16∶0-sn-3-SPC) is described. Synthesis was accomplished by acylating free glycerophosphorylcholine (GPC) with the anhydride and potassium
salt of the desired acid. Purification of 1,2-16∶0-sn-3-GPC was accomplished by crystallization, while purification of 1,2-18∶2-sn-3-GPC required the use of alumina column chromatography and then crystallization from acetone at −7C.
Scientific contribution N. 491, Agricultural Experiment Station, University of Connecticut, Storrs. 相似文献
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糠醛合成1,2-二乙酰氧基-1,2-双(2-呋喃基)乙烯的新工艺 总被引:1,自引:1,他引:0
以糠醛为原料 ,VB1 为催化剂 ,利用偶姻缩合合成了糠偶姻 ,并以此为原料 ,改变以往先溶解后降温 ,然后在低温下反应的传统工艺 ,使其醋酸酐化得到 1,2 二乙酰氧基 1,2 双 ( 2 呋喃基 )乙烯。讨论了反应温度、反应时间、催化剂用量以及投料比等因素对产物收率的影响 ,确定最佳合成工艺条件为 :反应温度 130~ 140℃ ,反应时间 3h ,催化剂、糠偶姻与醋酸酐的物质的量比为 0 0 2 88∶0 0 15 6∶0 0 85 3。产物的收率提高到 86 1% ,其熔点为 2 0 2~ 2 0 4℃。通过元素分析、GC -Mass谱、IR谱、1 HNMR谱对所合成的化合物进行了全面分析表征 ,证实了其分子结构式 相似文献
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1,2-butanediol (1,2-BDO) and 1,2-propanediol (1,2-PDO) are inevitably side produced in the ethylene glycol (EG) production processes from non-petroleum routes, but are very difficult to separate by the ordinary distillation method because of the closeness of their boiling temperatures to EG, thus compromise the economy of these processes. The azeotropic distillation process using 1-octanol (CPO) as an entrainer to separate EG and 1,2-BDO mixture with or without 1,2-PDO was studied in this paper. Four binary vapour–liquid equilibrium data of EG-1,2-BDO, EG-CPO, 1,2-BDO-CPO, and 1,2-PDO-CPO were measured using an Ellis equilibrium kettle and regressed with the thermodynamic model of non-random two liquid to obtain the corresponding binary interaction parameters. On this basis, azeotropic distillations with CPO as an entrainer were designed to separate EG and 1,2-BDO with or without 1,2-PDO. The complete separation processes, including the azeotropic distillation and CPO recovery process consisting of extraction with H2O and subsequent distillation, were simulated and optimized with Aspen Plus for both the EG-1,2-BDO binary mixture and the EG-1,2-BDO-1,2-PDO ternary mixture. The simulation results show that the azeotropic distillation method with CPO as an entrainer can effectively separate the mixture of EG-1,2-BDO and EG-1,2-BDO-1,2-PDO, achieving EG of 99.90% purity with 99.98% recovery and 1,2-BDO of 99.30% purity with 99.45% recovery for the binary mixture, and achieving EG of 99.90% purity with 99.80% recovery, 1,2-BDO of 99.35% purity with 99.35% recovery, and 1,2-PDO of 90.59% purity with 94.38% recovery for the ternary mixture. These processes are promising for industrial application and can significantly improve the economy of non-petroleum EG production. 相似文献
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分别以吡啶和三乙胺为催化剂,在传统加热和微波辐射两种条件下对5种目标产物进行了合成,其中目标产物Ⅱ、Ⅳ和Ⅴ经科技查新证实均属国内外文献未公开报道的新型化合物,其新颖性已为教育部科技查新工作站(吉林大学查新检索咨询中心)的200604311212号《科技查新报告》所证实。以吡啶为催化剂,目标产物产率由传统加热下的61.6%提高到微波辐射下的81.6%,反应时间缩短为传统的1/100;以三乙胺为催化剂,目标产物产率由传统加热下的75.2%提高到微波辐射下的94.4%,反应时间缩短为传统的1/15。通过元素分析、MS谱、1HNMR谱对所合成的目标产物分别进行了全面的表征,证实了其分子结构。并对5种目标产物进行了紫外测试,得出其最大吸收峰在315 nm左右。实验结果表明:当糠偶姻的用量为20 mmol时,最适宜反应条件为:n(糠偶姻)∶n(酰氯)=1∶2.2,有机碱三乙胺的用量为25 mL,微波工作功率为240 W,辐射时间10 min,产率94%以上。 相似文献