| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to a method of producing methyl chloride, which involves reacting methanol with hydrogen chloride in a synthesis reactor to obtain a vapour-gas mixture and partial condensation thereof, where methyl chloride is removed from the system in vapour form. The condensate is fed into a fractionation column using calcium chloride as an agent which decomposes the hydrochloric acid azeotrope. The still liquor from the column is fed for evaporation of water, which is removed from the process, and the evaporated still liquor is returned into the column at the feed level, wherein the vapour-gas stream collected from the top of the column is returned into the synthesis reactor, and the still liquor is partially removed from the system while simultaneously feeding fresh aqueous calcium chloride solution into the system. The method is characterised by that the still liquor is neutralised with an aqueous suspension of calcium hydroxide before evaporation to pH 6.5-8, and then clarified.EFFECT: method which enables production with more complete recycling of hydrogen chloride and also enables to recycle chloride and salt wastes from other processes of an organosilicon complex, while preventing loss of hydrogen chloride and formation of waste water.6 cl, 4 ex, 1 dwg |
