Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1973-12-21
1976-04-06
Hart, Charles N.
Gas separation
Means within gas stream for conducting concentrate to collector
55 52, 55 84, 2603468M, 203 42, B01D 1900, B01D 4700, C07D30760, B01D 4702
Patent
active
039486230
ABSTRACT:
In a process for separating maleic anhydride or phthalic anhydride from a gaseous mixture by absorption into an organic absorbent flowing downwardly and countercurrently to the gaseous mixture in an absorption column having at least 4 stages, the improvement is made which comprises removing heat from a zone of the absorption column above the gaseous mixture feed point and below the top 2 stages of the column in a sufficient amount so that more than half of the temperature gradient for the absorbent liquid in the column is across at least 2 stages above the gaseous mixture feed point and below the top 2 stages of the column. Preferably said heat is removed from the absorber column by withdrawing a stream of absorbent from the lower part of the column, cooling the stream and then recycling the resulting cooled absorbent to the column.
REFERENCES:
patent: 2574644 (1951-11-01), Landau
patent: 3818680 (1974-06-01), Marquis
Perry's Chemical Engineers Handbook, pp. 14-33, 4th Ed. 1963.
Separation Processes, King, McGraw-Hill, 1971, p. 343.
Lind Wilton H.
Paradis Stephen G.
Chevron Research Company
DeJonghe T. G.
Hart Charles N.
Lander Ferris H.
Magdeburger G. F.
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