Process for the purification of an oxidation off gas with energy

Details Process for the purification of an oxidation off gas with energy Process for the purification of an oxidation off gas with energy

1995-04-10

1997-03-25

Langel, Wayne

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Organic component

60 3902, 95237, 560 77, 562414, F02C 320, C07C 5116

Patent

active

056141599

ABSTRACT:
In the purification of an off-gas stream originating from a process of oxidizing a liquid mixture of para-xylene with methyl para-toluate with an oxygen-containing gas under pressure, the off-gas being contaminated with at least one of an aliphatic and an aromatic impurity, which comprises expanding the off-gas stream in an expansion turbine for generating mechanical or electrical energy so as to obtain an at least partial recovery of the energy contained in the off-gas, the improvement comprising subjecting the off-gas to at least one absorption step under pressure to remove at least one component from the off-gas and subjecting the resultant off-gas stream to combustion under a pressure of more than 3 bar prior to expanding the off-gas stream in the expansion turbine.

REFERENCES:
patent: 3603085 (1971-09-01), Parmegiani et al.
patent: 3989600 (1976-11-01), Takahashi et al.
patent: 4102983 (1978-07-01), Yamase et al.
patent: 4172209 (1979-10-01), Vora
patent: 4464477 (1984-08-01), Buenger et al.
patent: 4642369 (1987-02-01), Modic et al.
patent: 4642377 (1987-02-01), Modic et al.
Official Translation of Nozaki, K., et al., Japanese Kokai 54-148,178, published Nov. 20, 1979.

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