Distillation: processes – separatory – Plural distillations performed on same material – One a distillation under positive pressure or vacuum
Patent
1982-01-26
1983-05-31
Sever, Frank
Distillation: processes, separatory
Plural distillations performed on same material
One a distillation under positive pressure or vacuum
203 78, 203 82, 203 84, 203 94, 203 98, 568594, 568913, B01D 326
Patent
active
043859658
ABSTRACT:
In a process for recovering pure methylal from methanol-methylal mixtures, which can optionally contain still further compounds, the separation conducted in a rectification device comprising two rectifying columns. In the first rectifying column, the mixture to be separated is rectified under a pressure lower than that in the second column, into a methylal-rich, methanol-poor distillate, and into a practically methylal-free, methanol-rich sump product. The methylal-rich distillate of the first rectification is then separated in a second rectifying column, operated under a higher pressure than the first rectification column, into a compound stream containing methanol and methylal, which is then recycled to the first rectifying column, and into pure methylal as the sump product. In a specific refinement, the first rectification is preferably operated under a pressure of 1-22 bar absolute and the second rectification preferably under a pressure of 9-30 bar absolute, with the second rectification being operated under a pressure which is at least 8 bar higher than that of the first rectification.
REFERENCES:
patent: 1850836 (1932-03-01), Guinot
Robinson and Gilliland, Elements of Fractional Distillation, 4th Edition, pp. 196-212.
Kaufhold Manfred
Muller Wolfgang H. E.
Chemische Werke Huls A.G.
Sever Frank
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