| abstract |
PURPOSE: To recover methyl mercaptan, economically, from the exhaust gas of a methionine synthesis process containing hydantoin reaction process, by washing the exhaust gas containing methyl mercaptan with methyl mercaptopropionaldehyde. n CONSTITUTION: In the methonine synthesis containing hydantoin reaction in the process, the gas containing methyl mercaptan (MM) exhausted from the hydantoin synthesis reactor 3 is introduced into the water scrubber 1 through a pipe 4 to remove a slight amount of ammonia. The washed gas is introduced through a pipe 7 to an absorber 2, in which it is washed with methylmercaptopropionaldehyde (MA) to absorb and remove the MM. The washing liquid is returned to the MA synthesis reactor to recover the MM in high efficiency. Both of the water scrubber 1 and the absorber 2 are operated under a pressure of ≤2kg/cm 2 G and a temperature of 0W50°C. n COPYRIGHT: (C)1980,JPO&Japio |