. Practical methods of organic chemistry . e filled with water at200. A current, not too rapid, ofcarbon monoxide and hydro-chloric acid gas is led in throughthe prong-shaped tube while the stirrer isset in motion (a small motor is convenient).The carbon monoxide, contained in a gas-ometer of about 10 litres, is passed firstthrough a solution of caustic potash (1:1)and then through a wash-bottle containingconcentrated sulphuric acid. The hydro-chloric acid is generated in a Kipp ap-paratus from fused ammonium chloride andconcentrated sulphuric acid. It is passed FlG- 75- through a wash-bottle
. Practical methods of organic chemistry . e filled with water at200. A current, not too rapid, ofcarbon monoxide and hydro-chloric acid gas is led in throughthe prong-shaped tube while the stirrer isset in motion (a small motor is convenient).The carbon monoxide, contained in a gas-ometer of about 10 litres, is passed firstthrough a solution of caustic potash (1:1)and then through a wash-bottle containingconcentrated sulphuric acid. The hydro-chloric acid is generated in a Kipp ap-paratus from fused ammonium chloride andconcentrated sulphuric acid. It is passed FlG- 75- through a wash-bottle containing concentrated sulphuric gas currents are so regulated that the volume of the carbonmonoxide is about twice as large as that of the hydrochloric escaping gas is led directly to the hood opening. In thecourse of an hour when about 1-2 litres of carbon monoxide havebeen passed into the mixture, the temperature rises to 25-300;the remainder of the gas is passed in during four to five hours. 1 B. 30, 1622; 31, 304 SPECIAL PART If the reaction-mixture should become so viscous before the lapseof this time that the stirrer revolves only with difficulty, the re-action may be stopped. The viscid product is then poured intoa large flask containing crushed ice; the aldehyde formed andany unattacked toluene is distilled over with steam. The distil-late— oil and water — is then shaken up with a sodium bisulphitesolution for a long time. The toluene, remaining undissolved, isseparated in a dropping funnel. If the aldehyde-bisulphite com-pound should crystallise out, water is added until it dissolves. Thefiltered water solution is then treated with anhydrous soda until itshows a decided alkaline reaction; the aldehyde is then againdistilled over with steam. It is extracted from the distillate withether. Upon evaporating the ether, from 20-22 grammes of per-fectly pure tolylaldehyde remains. Boiling-point, 2040. Preparation of Carbon MonoxideIn a round lit
Size: 1373px × 1819px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1900, bookpublishernp, bookyear1901
