Patent GB-401531-A (GB)
Title: Separation of acetylene
IPC: B01D53/14
Filed: 1933-01-27
Abstract: Acetylene is absorbed selectively from gases containing it by means of alkyl carbonates, and is subsequently recovered by heating the resulting solution.  To obtain acetylene of high purity, low temperatures are employed, the absorbed gases are expelled fractionally or the gases are subjected to repeated absorption and expulsion.  High pressures increase the preferential solubility of the acetylene.  Diethyl carbonate, methylethyl carbonate, ethylpropyl <PICT:0401531/III/1> carbonate, n-propyl carbonate, and n-butyl carbonate are specified solvents.  In the Figure the gaseous mixture, e.g. that obtained by cracking hydrocarbons, enters near the foot of a bubble tower 1 which is supplied with alkyl carbonate through a pipe 6 and the resulting solution of acetylene passes through a heat-interchanger 9 to the boiler 13, a pressure-reducing valve or a pump being employed depending upon whether the bubble tower 1 is at high or at atmospheric pressure.  The solvent leaving the boiler 13 is pumped to the heat-interchanger 9 and after further cooling in a device 17 again enters the tower 1.  The washed gases leave the tower 1 after meeting the cooler 23, and the expelled gases leave the boiler 13 after meeting the cooler 22.  When further purification is necessary, a part or the whole of the acetylene leaving the boiler 13 is pumped into a tower 1a, the unabsorbed gases being passed, if desired, through pipe 27 to the raw gas stream entering the tower 1. The solution of acetylene leaving the tower 1a passes through a heat-interchanger and boiler as before.  Specification 331,654, [Class 1 (i), Chemical processes &c.], is referred to.ALSO:Acetylene is absorbed selectively from gases containing it by means of alkyl carbonates, and is subsequently recovered by heating the resulting solution.  To obtain acetylene of high purity, low temperatures are employed, the absorbed gases are expelled fractionally or the gases are subjected to repeated absorption and expulsion.  High pressures increase the preferential solubility of the acetylene.  Diethyl carbonate, methylethyl carbonate, ethylpropyl carbonate, n-propyl carbona e and n-butyl carbonate are specified solvents.  In the figure <PICT:0401531/IV/1> the gaseous mixture, e.g., that obtained by cracking hydrocarbons, enters near the foot of a bubble tower 1 which is supplied with alkyl carbonate through a pipe 6 and the resulting solution of acetylene passes through a heat interchanger 9 to the boiler 13, a pressure reducing valve or a pump being employed depending upon whether the bubble tower 1 is at high or at atmospheric pressure. The solvent leaving the boiler 13 is pumped to the heat interchanger 9 and after further cooling in a device 17 again enters the tower 1.  The washed gases leave the tower 1 after meeting the cooler 23, and the expelled gases leave the boiler 13 after meeting the cooler 22.  When further purification is necessary, a part or the whole of the acetylene leaving the boiler 13, is pumped into a tower 1a, the unabsorbed gases being passed, if desired, through pipe 27 to the raw gas stream entering the tower 1.  The solution of acetylene leaving the tower 1a passes through a heat interchanger and boiler as before.  Specification 331,654, [Class 2 (i), Acetylene], is referred to.