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Preparation of sodium methoxide test samples and reagents
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Preparation of sodium methoxide test samples and reagents

[Abstract]:
甲醇钠实验试样和试剂的制备:(1)甲醇钠—甲醇溶液,从生产车间的成品槽中取甲醇钠,按“标准”测定其含量,甲醇钠28.15%,水份0.084%,密度0.9620g/cm3。(2)工业无水甲醇,水份<0.1%;(3)无水醋酸,取分析纯冰醋酸,先用卡尔费休试剂准确测定其水分,然后按水量1:1(摩尔比)加入醋酐加0.01%浓硫酸,放置2h后使用;(4)醋酸甲醇溶液,按1:5配置(体积比);(5)卡尔*费休

Preparation of sodium methoxide test samples and reagents:

(1) Sodium methoxide-methanol solution, sodium methoxide was taken from the finished product tank of the production workshop, and its content was determined according to "standard", sodium methoxide 28.15%, moisture 0.084%, density 0.9620 g/cm3.

(2) Industrial anhydrous methanol, water <0.1%;

(3) Anhydrous acetic acid, the analytical pure glacial acetic acid was taken, and the water was accurately determined by Karl Fischer reagent, then the acetic acid anhydride was added with 0.01% concentrated sulfuric acid according to the water amount of 1:1 (molar ratio), and it was used after being placed for 2 hours;

(4) Acetic acid methanol solution, according to 1:5 configuration (volume ratio);

(5) Karl Fischer reagent;

Take 9 1000ml dry volumetric flasks, then weigh the specified amount of water (accurate to 0.0002 g) into the volumetric flask, immediately add the measured sodium methoxide solution to the mark, shake well, and then pour into a 30ml titration bottle. Weigh 1 to 2 g (accurate to 0.0002 g) and measure in a KF-1 moisture analyzer, and take the average of 2 times.