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- Activity of alkali methoxide catalysts (sodium methoxide and potassium methoxide) in carbonylation of methanol was studied.IR, GC and GC-MS were used to identify products and changes of the catalysts. 利用红外、气相色谱、色谱-质谱联用方法对甲醇羰基化反应过程中甲醇钾和甲醇钠催化剂的失活情况进行了研究。
- Keywords methanol carbonylation;sodium methoxide catalyst;propylene oxide promoter;methyl formate; 甲醇羰化;甲醇钠催化剂;环氧丙烷-助催化剂;甲酸甲酯;
- sodium methoxide catalyst 甲醇钠催化剂
- In the function of sodium methoxide, several factors effecting on alcoholysis of urea by zinc oxide catalyst were obtained. 探讨了在甲醇钠作用下,氧化锌催化尿素醇解的影响因素。
- Methyl 3-methoxypropionate(MMP)was prepared from methanol and methyl acrylate(MA) using sodium methoxide as catalyst. 以甲醇和丙烯酸甲酯(MA)为原料,甲醇钠为催化剂,合成了3-甲氧基丙酸甲酯(MMP)。
- Sodium methoxide used as catalyst for the synthesis of methyl formate by carbonylation of methanol was studied, and effect of three kinds of promoter was investigated. 在间歇釜式反应器中,进行一氧化碳与甲醇羰基化合成甲酸甲酯的合成,考察甲醇钠碱性催化体系对反应的影响。
- TAKE CARE when handling the sodium methoxide -- full safety precautions! 小心地处理醇盐!
- Sodium formate is much less active for the carbonylation of methanol than sodium methoxide. 甲酸钠对甲醇羰基化反应也具有一定的催化作用,但其活性远远低于甲醇钠。
- A new method of preparing intercalated and amorphous kaolinite with sodium methoxide was introduced in this article. 利用甲醇钠强烈的夺氢作用,介绍了一种制备插层和无定形高岭土的方法。
- In the function of sodium methoxide, several factors effecting on alcoholysis of u... 探讨了在甲醇钠作用下,氧化锌催化尿素醇解的影响因素。
- We investigated relationships between the reaction and concentration of sodium methoxide or temperature by XRD analysis. 利用XRD为主要检测手段研究了甲醇钠的质量分数、反应温度等因素对反应的影响。
- Replacement of potassium hydride by sodium methoxide,replacement of hydrogen chloride by HCl-ethanol,and replacement of ether by toluene were in the improved procedure. 以甲醇钠代替氢化钾作为缩合剂;以盐酸乙醇代替氯化氢气体;以甲苯代替乙醚;对此工艺进行了改进。结果:得到较好的工艺条件;总收率达到47.;4%25。
- The factors on isomerization such as reaction temperature, time, amounts of sodium methoxide and ethyl glycol have been researched.The optiomal condition has been set. 研究了反应温度、反应时间、甲醇钠用量、溶剂量对异构效果和收率的影响,确定了优化工艺条件。
- Sodium methoxide is a DANGEROUS CHEMICAL. Take full safety precautions when working with methanol, lye and sodium methoxide, wear safety goggles, protective gloves and clothing, have running water nearby. 小心用碱!使用防护衣和安全手套。临近自来水管。
- Vanillin is synthesized via bromination, methoxylation and purification processes with p-hydroxybenzalde-hyde, bromine and sodium methoxide as raw materials, and the yield is up to 76% . 以对羟基苯甲醛、溴素和甲醇钠为原料,经过单溴化、甲氧基化反应和精制过程合成香兰素,收率可达76%25。
- The spirocyclopropane derivatives were readily converted into the corresponding methyl esters in nearly quantitative yields by treatment with absolute methanol containing catalytic amounts of sodium methoxide. 螺环化合物经甲醇钠催化下的甲醇解开环,定量得到氨基和羧基均被保护的6个开环产物;
- It showed that kaolinite was easy to be expanded at low concentration of sodium methoxide or low temperature and to be amorphous on the contrary.IR analysis proved the change of kaolinite structure. 结果表明:在反应温度较低、质量分数较低的甲醇钠溶液中,高岭土容易被插层而膨胀,反之高岭土的层状结构被破坏而无定形化。
- The title compound was prepared from monomethyl sulfate and sodium acetyl ethenoxide, which was obtained from the reaction of acetone, sodium methoxide and methyl formate.The overall yield was 71.8%? 丙酮、甲醇钠与甲酸甲酯反应得乙酰基乙烯醇钠;再与硫酸氢甲酯反应得到目标产物;收率可达71.;8%25。
- Keywords lard;interesterification;sodium methoxide; 猪油;酯交换;甲醇钠;
- Keywords sodium methoxide;triethylamine;molecular sieve;silica;polymer;supported catalyst;methanol;diethylamine;carbonylation;transesterificati; 甲醇钠;三乙胺;分子筛;硅胶;高聚物;负载型催化剂;甲醇;二乙胺;羰化;酯交换;