in neat (no solvent) kept for 3 h in porcelain boats contained in a quartz-glass elec. heated tube (150 - 300.degree) in an atm. of dried carbon dioxide; withdrawn from the furnace; cooled in a current of test gas; argentometric anal.;
参考文献
Journal of Applied Chemistry USSR (English Translation), , vol. 56, p. 649 - 651
Zhurnal Prikladnoi Khimii (Sankt-Peterburg, Russian Federation), , vol. 56, p. 681 - 683
in butan-1-ol byproducts: NH3; dissoln. of Na in butanol; addn. of dry urea to boiling soln. (containg a maximum of 0.04percent H2O; reflux) with shaking; boiling overnight at 140°C bath temp.; pptn.;; filtration; washing (ethanol, ether); separation from butanol in vac. at 140°C; impurities: 1-2percent Na2CO3 and 0-0.2percent urea;;
