查询词典 dimethyl ether

The dimethyl sulfate, a substance that is used to produce industrial dyes and pesticides, can be corrosive and irritative to human skin, eyes and the upper respiratory tract.

硫酸二甲酯是用来生产燃料和农药的物质。它对于人类的皮肤，眼睛和上呼吸道系统具有腐蚀和刺激作用。

Through mechanism analyzing on the process of producing HMT , it was known that because the resistance of isobutylene was small ,the yield of outgrowth in such a reaction system was little and the yield of reaction was as high as 86%. 2,3-dimethyI-butene-2 had the biggest resistance and lowest yield of reaction of 18%. 2,3-dimethyl-butene-l had bigger resistance than isobutylene and more outgrowth than isobutyles but its yield of reaction could reach 70%.

通过对上述三种烯烃合成HMT的研究可知，由于新己烯位阻小，反应中副反应少，收率高达86％：而2，3—二甲基—丁烯—2的位阻最大，反应中副反应最多，反应收率最高仅为18％；2，3—二甲基—丁烯—1的位阻比新己烯大，反应副产物比新己烯多，但反应收率仍可达70％。

Ketenes, notably dimethyl ketene, readily undergo oligomerization and polymerization

烯酮，特别是二甲基烯酮，很容易齐聚和聚合。

AB glue and polyethylene were disperse systems, in which Rhoda-mine 6G, lactoflavin and 2, 9-dimethyl, 4, 4-diphenyl, 1, 10-phenanthroline were dispersed with different concentrations. A heat-melt method was used to prepare organic light transform films. Excited at 460nm and 500nm, fluorescence spectrums of these films were measured.

以AB胶及线性低密度聚乙烯为分散系，将诺丹明6G、核黄素及溴甲酚紫染料以不同浓度分散在其中，用热熔法制备了光转换膜，测量了它们在460nm及500nm激发下的荧光光谱。

Result succinylation modified, trypsin hydrolysis, SDS and β-mercaptoethanol treatment greatly reduced lectin from gill of bighead carp; dimethyl sulfoxide, NaCl, tri fluoroacetic acid at a given treated concentration had no effect on its activity; lectin from gill of bighead carp agglutinated Haenatcoccus pluvialis, vibrio harveyi and Vibrioauguil larum specifically.

结果］琥珀酰化修饰、胰蛋白酶水解、SDS及β-巯基乙醇处理均使鳙鳃凝集素活性大大降低；在设定的处理浓度下，二甲基亚砜、NaCl及三氟乙酸对其活性没有影响；鳙鳃凝集素能专一地凝集雨生红球藻及哈维氏弧菌和鳗弧菌。

As a professional sales company, to meet customer demand, we need a stable supply of quality and quantity, so we and the international well-known chemical companies: ExxonMobil, Shell, BASF, Leander, Mitsubishi Chemical to establish a good cooperation relations; more access Jinxi Natural Gas Chemical Co., Ltd. dimethyl carbonate, propylene glycol, methanol and other products qualified agent.

作为专业的销售公司，满足客户的需求，我们必需稳定保质保量的供应，所以我们与国际知名化工公司：埃克森美孚、壳牌、巴斯夫、利安德、三菱化学建立良好的合作关系；更获得锦西天然气化工有限公司碳酸二甲酯、丙二醇、甲醇等产品代理资格。

Cantharidin(exo,exo-2,3-Dimethyl-7-oxabicyclo[2,2,1]heptane-2,3-dicar- boxylic anhydride ) is an active principle of Lytta caragarae, Mylabris Phalerata and Epicauta gorhami, and exists in various other insect species.

中文摘要斑蝥素( Cantharidin； exo，exo-2，3-Dimethyl-7-oxabicyclo [2，2，1]heptane- 2，3-dicarboxylic anhydride )是一个来自昆虫的天然物。

Using ethylenediamine, urea, methanal and formic acid as base material, 1, 3-dimethyl-2-imidazolidinone was prepared via cyclization reaction and methylation.

以乙二胺、尿素、甲醛和甲酸为原料，经过环化和甲基化反应制得目标产物1，3-二甲基－2-咪唑啉酮(1，3-DMI)。

Green environmental protection, harmful solvents are free such as dimethyl benzene, methanal ect.

自身具备非常优秀的消泡能力，制漆过程中无需加入大量的消泡剂。·绿色环保，不含二甲苯、甲醛等有害溶剂。

Separation and recovery process principles of tail gases in producing dimethyl phosphite were introduced; Separation and recovery courses of hydrogen chloride and methyl chloride in tail gases were also analyzed. The percent recovery for hydrogen chloride and methyl chloride is over 99.9% and 93%, respectively, by using the process of combining stage recycle of solvent with lower temperature.

介绍了亚磷酸二甲酯生产中尾气回收的工艺原理，对尾气中氯化氢及氯甲烷的分离回收过程进行了分析；提出了采用吸收剂分段循环和降温相结合的回收工艺，将此工艺应用于3万t/a的亚磷酸二甲酯的生产装置的尾气回收上，可使氯化氢的回收率达99.9%，氯甲烷的回收率达93%以上，盐酸质量分数大于30%，尾气中氯甲烷的质量分数小于5%。

The use of the web to spread fears that flicking the switch on the LHC could create a Black Hole that could swallow up the Earth particularly concerned him, he said.

他说，使用互联网散布恐慌说启动LHC会生成一个可能吞噬地球的黑洞的做法让他感到忧虑。

Not a single word have I written down.

我一个字也没有写下来。