【摘 要】
：
Non-α-tocopherols are hydroxymethylated and hydrogenated to produce α-tocopherol in one pot process bysimultaneously reacting with paraformaldehyde and hydrog
【机 构】
：
National Laboratory of Secondary Resources Chemical Engineering
论文部分内容阅读
Non-α-tocopherols are hydroxymethylated and hydrogenated to produce α-tocopherol in one pot process bysimultaneously reacting with paraformaldehyde and hydrogen in the presence of catalysts of benzenesulfonic acid and 5%Pd/C in an autoclave. Effects of various operation conditions have been studied. The preferable reaction conditions are: temperature 180 ℃ to 200 ℃, pressure 5.0 MPa, acid concentration 0.5 g/100 ml ethanol, mass ratio of Pd/C to tocopherols 7.1 g/100 g, and reaction time 5.0 h. A product with α-tocopherol content of 80% was obtained by using a raw material with a total tocopherols content of 80.54%. The conversion of non-α-tocopherols is almost 100%, and the mole yield ofα-tocopherol is more than 90%.
其他文献
Silicon physical unclonable function(PUF) is a popular hardware security primitive that exploits the intrinsic variation of IC manufacturing process to generate
Chip multiprocessor presents brand new opportunities for holistic on-chip data and coherence management solutions. An intelligent protocol should be adaptive to
A common method of prolonging the lifetime of wireless sensor networks is to use low power duty cycling protocol. Existing protocols consist of two categories:
Wellbore temperature field equations are established with considerations of the enthalpy changes of the natural gas during the deep-water gas well testing. A pr
In recent years, to maximize the value of software testing and analysis, we have proposed the methodology of cooperative software testing and analysis (in short
Designing eco-friendly system has been at the forefront of computing research. Faced with a growing concern about the server energy expenditure and the climate
Modern datacenter servers hosting popular Internet services face significant and multi-facet challenges in performance and power control. The user-perceived per
采用数值模拟方法分析了电磁连铸复合式结晶器内的流场．对静磁场磁感应强度不同时组合磁场下的流场进行了比较，在此基础上，分析了电磁连铸复合式结晶器的工作原理．分析结果表明：电
This study reports research on pesticide suspension rheology and a new rheological parameter, the relative value of approach, which has great advantage for judg
文章选取2000年以来新疆区域经济与环境数据,建立产业结构调整与环境污染指标的计量模型,重点估算出产业结构调整对环境污染的区域特征。实证结果发现:第一,在工业废水排放量