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甘油铜试剂是一种对醛类和还原醣的试剂,发现已一年了。在实验室里屡次应用都获得良好的效果,并不亚于斐林和本乃狄试剂,有的地方还比它们好,尤其是甘油铜试剂所用药品的普遍性和经济上的价值是很值得推广应用的。在研究醛类和还原醣的时候,我们都知道有斐林试剂、本乃狄试剂和巴弗试剂,用来检定溶液内是否含有醛类和还原醣,或者鉴定溶液内所含的还原醣的量。可是当用斐林试剂时必须将硫酸铜溶液和酒 相似文献
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Summary Poly(4-vinylpyridine)(I) and poly(2-vinylpyridine)(II) supported silver dichromates are readily prepared and used as mild, efficient and easy to handle oxidizing agents for hydroxy compounds. Polymeric reagent (II) is more reactive than (I). 相似文献
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浮选药剂乳化工艺的应用及效果 总被引:1,自引:0,他引:1
分析了马家沟矿选煤厂浮选生产的基本情况 ,论证了乳化浮选对该选煤厂的意义和适用性 ,阐述了浮选药剂乳化站的安装设计、施工和调试过程 ;项目实施后 ,浮选精煤回收率同比提高 1 .65 % ,吨煤药耗同比降低 2 5 %左右 ,全年经济效益超过 1 1 4× 1 0 6元。 相似文献
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S. V. Kostin P. M. Krishenik S. A. Rogachev K. G. Shkadinsky 《International Journal of Self-Propagating High-Temperature Synthesis》2013,22(3):129-134
A mathematical model of two-zone infiltration-mediated combustion of a porous solid reagent (Ti) in an isobaric counterflow of three-component gaseous reagent (air) was constructed and numerically analyzed. We explored structural features, stability issues, and also the influence of inert impurity gas on the initiation and structure/stability of two-zone combustion waves. The relevant experimental results are also presented. 相似文献
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Summary A general reagent applicable to a wide range of thiocyanogen values and capable of reacting with practically all types of
fats and oils has been described.
The principal features of the method include rigorous purification of all reagents; replacement of 25% of the volume of glacial
acetic acid normally used in preparing the thiocyanogen reagent with an equal volume of carbon tetrachloride; use of finely
powdered, dry potassium iodide; increase in the amount of potassium iodide added prior to titration from 1.0 gram to twice
the equivalent weight calculated for the volume of standard reagent used; and complete exclusion of water from all reagents
and glassware.
The value of the modified reagent is attested by data indicating its improved stability, accuracy when applied to pure unsaturated
fatty acids, and its general applicability to a wide variety of fats and fat products.
One of the laboratories of the Bureau of Agricultural and Industrial Chemistry, Agricultural Research Administration, U. S.
Department of Agriculture. 相似文献
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