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水泵离甲醇罐区的安全距离? 罐区都有防火堤,防爆区域在防火堤内。建议设置在罐区防火堤外5m即可。查看更多
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离心泵的所有部件的讨论? 不知道楼主想表达什么意思! 想了解离心泵的结构和材质?想了解朋友的知识储备?……查看更多
关于一道注化考试真题? 回复 1# zjwmcl 答案应该是a,b,c.我们讨论的结果也是入口管线漏气。查看更多
请问谁有SmartPlant 3D Administration培训教程? 没有时间去培训,想自学。谢谢!查看更多
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说说银法甲醛? 反应是在氧化器的触媒框进行的,触媒框下面是列管式换热器,反应以后气体进入换热器与水换热产生蒸汽,反应气温度降到150度去吸收塔。氧化器和管道都是不锈钢的。查看更多
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现场磁翻板液位计使用不起来的问题? 我认为浮子与磁翻版的配合有问题 因为浮子可以更换磁翻版 再试试查看更多
Ⅰ级管束和Ⅱ级管束的区别? 我知道标准上是这么写的,所以我用了个简单常用。碳钢管束可能很少会用到i级管束,常见的也许是升降膜换热器?查看更多
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求国内外高效低能耗精馏技术及塔设备? 来天津大学看看吧查看更多
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计算接管局部应力的标准WRC107 WRC297? 以后没事儿就要发贴 不然下载不了啊查看更多
请教:丁基锂的 pka值 谢谢各位大虾? 如下数据请参考: entry name: butyllithium, 9ci, 8ci synonym(s): lithium butyl. 1-lithiobutane chapman hall number: hdj11-o cas registry number: 109-72-8 type of compound code(s): bb0080, bb0170, bb0260, bb0266, ba0625, ba0550, bb0332, bb0370, bb0380, bb0410, bb0430, bb0450, bb0650, bb0701 h3cch2ch2ch2li molecular formula: c4h9li molecular weight: m 64.056. general statement: tetrameric in ethers, hexameric in hydrocarbons. dimer-tetramer equilib. in thf at low temps.. source/synthesis: synth. from li and 1-chlorobutane. use/importance: reagent for org. and organomet. synth. polym. initiator. commercially available. reagent for metal-halogen exchange; metallation of active hydrogen compds., 1,3-pentadiyne, allene; with kobut, allylic metallation of alkenes; elimination of acetals to give alkenes; directed metallation of arenes, aryl ethers, methylated pyridines and quinolines; effects 2,3-wittig rearrangement; used for ylid formation in wittig reaction; effects payne rearrangement of primary cis-2,3- epoxy alcohols to secondary 1,2-epoxy alcohol; adds to aldehydes, ketones; reagent for stereospecific desulfurisation of episulfides. adds to ketenes to give an enolate, which can be alkylated; adds with excellent syn-diastereoselectivity to .alpha.-chiral acyl silanes, protiodesilylation gives product of addn. to the aldehyde. substitutes trialkyl phosphates; with wcl6, catalyst for romp; with nibr2 catalyses subst. of aryl iodides, vinyl bromides by various organolithium compds. tert- butyl lithioacetate #frq15-z, licme2cooet, lich2ch=chcooet). physical description: liq. stable at r.t., eliminates lih on heating. solubility: sol. ethers, hydrocarbons. density: d25 0.765. melting point: mp -76 deg. boiling point: bp 0.0001 80-90 deg. other data: dipole moment 0.97d. forms complexes with ethers, amines, sulfides. supplier(s): aldrich 18617-1; fluka 20164; sigma b6011. derivative: tmed complex chapman hall number: lxt29-z cas registry number: 121412-27-9 use/importance: widely used but rarely isol. and not fully characterised. addn. of tmed activates buli for metallation, polym. and other reactions. derivative: 1,4-diazabicyclo[2.2.2]octane complex chapman hall number: lxt30-t physical description: cryst.. derivative: dimer synonym(s): dibutyldilithium chapman hall number: frl20-y molecular formula: c8h18li2 molecular weight: m 128.112. derivative: dimer, bis-tmed complex synonym(s): tmed complex (2:2) chapman hall number: lxc18-o physical description: colourless square monoclinic cryst. (hexanes at -92 deg). derivative: tetramer synonym(s): tetrabutyltetralithium, 8ci chapman hall number: fsc53-y cas registry number: 12277-46-2 molecular formula: c16h36li4 molecular weight: m 256.224. derivative: tetramer, tmed complex chapman hall number: lxc17-n physical description: colourless long rectangular orthorhombic cryst. (hexanes at -20 deg). other data: complex with composition (buli)4. 3/2 tmed also descr.. derivative: tetramer, tetrakis-thf complex chapman hall number: lxc16-m physical description: colourless square monoclinic cryst (hexanes at -92 deg). other data: crystal lattice also incorporates hexane. derivative: tetramer, tetrakis-dme complex synonym(s): dme complex (4:4) chapman hall number: lxc15-l physical description: colourless square tetragonal cryst. (hexanes at -40 deg). derivative: tetramer, tetrakis-methoxybenzene complex synonym(s): anisole complex (4:4) chapman hall number: frl21-z physical description: not isol., but stable in toluene at r.t.. solubility: sol. toluene. other data: anisole rapidly metallated on addn. of tmed to soln. of complex. derivative: hexamer synonym(s): hexabutylhexalithium chapman hall number: fsc71-c molecular formula: c24h54li6 molecular weight: m 384.337. references: gilman, h. et al.,j.o.c.,1958, 23, 1476 (use, metallation of aryl ethers) org. synth.,1960, 40, 66 (use, wittig reaction) screttas, c.g. et al.,j.a.c.s.,1965, 87, 3276 (derivs) dessy, r.e. et al.,j.o.c.,1965, 30, 3857 (reactions) hines, j.n. et al.,chem. comm.,1968, 1593 (reactions) kaiser, e.m. et al.,j.o.c.,1973, 38, 71 (use, metallation of pyridines, quinolines) buhler, j.d., j.o.c.,1973, 38, 904 (use, addn to aldehydes, ketones) trost, b.m. et al.,j.o.c.,1973, 38, 932 (use, desulfurisation) slocum, d.w. et al.,j.o.c.,1973, 38, 1675 (use, metallation of arenes) wakefield, b.j., the chemistry of organolithium compds.,pergamon, 1974, (rev) narasimhan, n.s. et al.,synthesis,1975, 796 (use, metallation of arenes) mitchell, r.h. et al.,tet. lett.,1975, 219 (use, wittig rearrangement) katz, t.j. et al.,j.a.c.s.,1976, 98, 605; ,606 (use, romp catal) parham, w.e. et al.,j.o.c.,1976, 41, 1184 (use, metallation) millard, a.a. et al.,j.a.c.s.,1977, 99, 4833 (use, subst of aryl, vinyl halides) hoffmann, r.w., angew. chem., int. ed.,1979, 18, 563 (use, wittig rearrangement) bates, r.b. et al.,j.o.c.,1979, 44, 3800 (use, allylic metallation of alkenes) tidwell, t.t., tet. lett.,1979, 4615 (use, addn to ketenes) kminek, i. et al.,coll. czech. chem. comm.,1981, 46, 1124 (derivs, thermodyn) compr. organomet. chem.,pergamon, 1982, 7, 1; ,1995, 11, 1 (rev) michelot, d. et al.,synth. commun.,1982, 12, 739 (use, metallation of allene) seebach, d. et al.,helv. chim. acta,1983, 66, 308 (cmr, struct) org. synth.,1983, 61, 42 (reactions) bauer, w. et al.,helv. chim. acta,1984, 67, 1972 (struct) heinzer, j. et al.,helv. chim. acta,1985, 68, 1848 (cmr, struct) mcgarrity, j.f. et al.,j.a.c.s.,1985, 107, 1805; ,1810 (pmr, li-7 nmr) plavsic, d. et al.,j. phys. chem.,1986, 90, 2075 (ms) marshall, j.a. et al.,j.o.c.,1986, 51, 4316; ,1987, 52, 3860; ,3883 (use, wittig rearrangement) thomas, r.d. et al.,j. organomet. chem.,1987, 328, 239 (cmr) bauer, w. et al.,j.a.c.s.,1987, 109, 970; ,1989, 111, 7191 (deriv, props, cmr, pmr, li-6 nmr) thomas, r.d. et al.,organometallics,1987, 6, 565 (cmr, li-6 nmr) teulade, m.p. et al.,tet. lett.,1987, 28, 405 (use, subst of alkyl phosphates) bulman page, p.c. et al.,chem. comm.,1988, 356 (use, payne rearrangement) nakada, m. et al.,j.a.c.s.,1988, 110, 4826 (use, addn to acyl silanes) nakai, e. et al.,tet. lett.,1988, 29, 5409 (use, wittig rearrangement) abdul-sada, a.k. et al.,j. organomet. chem.,1989, 375, c17 (ms) eppers, o. et al.,tet. lett.,1989, 30, 6155 (cmr, li-6 nmr) bailey, w.f. et al.,j.o.c.,1990, 55, 5404 (synth) arnett, e.m. et al.,j.a.c.s.,1991, 113, 7068 (thermodyn) rawson, d.j. et al.,tet. lett.,1991, 32, 2095 (synth) stanetty, p. et al.,j.o.c.,1992, 57, 6833 (props) nichols, m.a. et al.,j.a.c.s.,1993, 115, 1568 (derivs, cryst struct) barnett, n.d.r. et al.,j.a.c.s.,1993, 115, 1573 (deriv, cryst struct) bergander, k. et al.,tetrahedron,1994, 50, 5861 (props, cmr, li-6 nmr) lewis, r.j., sax's dangerous properties of industrial materials,8th edn., van nostrand reinhold, 1992, brr739 [00076048-6] 更多还在寻找中........查看更多
防冻功能的地面消火栓和消防水炮的内部结构,如何保证防 ...? 我们在南方,不存在防冻问题,进来学习学习...查看更多
默克领导研究财团以提高染料敏化太阳能电池效率? 染料敏化太阳能电池通常将不同强度的光转化为电力。在漫射光和直射日照中,电力可以在不影响性能、甚至在高温条件下产生。由于透光率可以灵活调整,他们非常适用于建筑外立面,并且可以对为办公建筑等提供能源。 将这个和建筑节能结合,太阳能墙体本身也起到一个隔热的作用 查看更多
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问题解决了给个结果好吗?!感谢? 有道理,建议得到解决或者根据坛友提供的思路经过实施后有明显效果和出现问题的帖子,要加强回访或类似情况反馈的行为,以便大家共同提高和交流、研讨,同时也能对得起大家的热情;不过这种方式很难实现了。查看更多
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低温甲醇洗水联运? 第一次水联运直接排地沟呀。 一般低温甲醇洗水联运时,经过水循环后系统水温都会升高,趁温度高时排,冬天没有结冰就流走了。查看更多
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谁有降低冷油器油温的好方案? 以上各位所说的方法都可以试试,另外可以联系降低循环水进水温度、提高循环水进水压力,提高冷油器冷却效果。查看更多
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致全体市民的一封信? 非常深刻 如果所有人都能做到 中国的环保很快就能解决 建议发给环保部长学习一下 到环保部的网站上查一下 查看更多
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化工防腐四氟板衬焊接? 如果是聚四氟乙烯焊接,的确是比较难的。查看更多
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真空碳酸钾脱硫? 主流焦化现在都用这个,好多单位都是,正常的时候很爽,不正常的时候…………哎…也爽…腐蚀啦,堵管啦…仪表故障什么的…频发…查看更多
多晶硅生产技术对比? rec 和memc都有流化床硅烷法的,只是国内“偷”不到相关技术而已查看更多
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求助脱盐水问题? 我公司有二级反渗透装置,第一级出来的就是一级脱盐水查看更多
简介
职业:北京吉星工程项目管理有限公司 - 实习生-操作员
学校:洛阳大学 - 环境与化学工程学院
地区:河南省
个人简介:上上网逛逛街上上网逛逛街看电视上上网.查看更多
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