Benzophenone purity reference material and preparation method thereof
A technology for reference material and benzophenone, applied in the field of benzophenone purity reference material and its preparation, can solve problems such as differences in delivery, difficulty in comparing data, and difficulty in arbitration of disputed data, so as to improve the consistency of comparison , reduce the uncertainty, and fill the gap of research and development
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Embodiment 1
[0025] (1) Buy crude benzophenone product from the market, take 50 grams of acetonitrile to make a nearly saturated solution, and prepare sample crystals by freezing crystallization. The specific conditions are: refrigerator 10℃ for 2 hours, according to 0.2℃ reduction / h cooling rate to -18℃ for 48 hours. Select the single crystal particles generated therein, and make a total of about 20 grams of pure product by batch; use acetonitrile to dissolve it, and add 20-100 micrograms of BHT stabilizer at the same time, and remove the solvent by rotary evaporation to obtain a pure product with uniform content; in powder form , Weigh and dispense into brown sample storage bottles under nitrogen protection, and prepare 200 bottles in one batch;
[0026] (2) The determination and uncertainty evaluation of pure benzophenone; determine the evaporation residue a of each pure product according to GB / T 9740-2008 "General Method for the Determination of Evaporation Residues of Chemical Reagents"...
Embodiment 2
[0047] (1) Buy crude benzophenone products from the market, take 50 g of ethyl acetate to make a nearly saturated solution, and prepare sample crystals by freezing crystallization. The specific conditions are: refrigerator at 10°C for 2 hours, according to the reduction The temperature is lowered to -18°C at a rate of 0.2°C / h for 48 hours. Select the single crystal particles generated in it, and make a total of about 20 grams of pure product by batch; use ethyl acetate to dissolve it, add 20-100 micrograms of BHT stabilizer, and remove the solvent by rotary evaporation to obtain a pure product with a uniform content; nitrogen Weigh and pack into brown sample storage bottles under protection, and prepare 200 bottles in one batch;
[0048] (2) The fixed value and uncertainty evaluation of pure benzophenone; same as in Example 1.
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