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矿井提升机电控设备专用控制器(DL-10〈PK〉)席纪常
dl-&agr;-Tocopherol is prepared by condensing trimethylhydroquinone with phytyl halide in a chlorinated lower aliphatic hydrocarbon solvent, in the presence of metallic tin and a Friedel-Crafts catalyst.Manzo ShionoYoichi NinagawaYoshiaki Omura
Indoeuropean languagesetymologyHamp, Eric PHrvatsko filološko društvoSuvremena Lingvistika
蕾丝花边(DL1449V)李财弟
本发明属于饲料添加剂制备的技术领域,具体为DL蛋氨酸锌的制备方法.该法是将蛋氨酸水溶液,加热至60~80℃,保持恒温,加入锌盐,搅拌后加入蛋氨酸金属盐和对应碳酸盐的水溶液调节pH,加热至60~110℃,反应0.5~1.0小时,然后过滤,常温水洗涤得到蛋氨酸锌产品.本发明所提供的制备方法不用催化剂,在水相中直接合成,工艺简单...
一种DL-泛解酸内酯的制备方法本发明提供了一种D泛醇的制备方法,所述制备方法包括如下步骤:D泛解酸内酯和3氨基丙醇在溶剂中进行酰化反应,得到含有D泛醇的混合液;其中,所述酰化反应的反应温度为1035℃.本发明提供的制备方法得到的D泛醇收率较高,并且纯度较高;同时,回收的溶剂可以继续套用,安全环保.赵安全...
Past, Present, Future | Kamal Khurana: The marriage counsellorBy Cordelia Jenkins
集成电器(DL-01)蔡斌