L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des

Commissariat a L'energie Atomique

Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges

L'air Liquide, Societe Anonyme Pour L'etude L'exploitation Des Procedes

Guy Simonet

Leon Hay

Rene Dupont

Laurent Ferenczi

Claude Pivard

Pierre Faugeras

Pierre Miquel

Didier Crozel

Hubert Rouyer

Yvonne Baudouin

Robert Eluard

Pierre Lecoq

In a process for manufacturing fatty alcohols comprising hydrogenating the corresponding fatty acid methyl esters, the hydrogen used for the hydrogenation reaction is regenerated from impure methanol as a by-product of the reaction. The impure methanol recovered from the hydrogenation reactor is conducted to a steam reformer reactor, from whence the regenerated hydrogen is recycled back to the hydrogenation reactor.

Process for manufacturing fatty alcohols

A method and apparatus are provided for reforming impure methanol wherein residual gas produced during the reforming reaction is combusted simultaneously with residual gas coming from the purification of the hydrogen produced. The apparatus includes a tubular reactor in which the steam reforming is performed, a vaporizer for the reaction mixture, a heat exchanger to exchange heat between the outgoing gases and the feed liquid, a separator, a purification unit, and a combustion furnace for the residual purification gas. The apparatus further comprises a pipe for bringing in the condensed water-alcohol mixture to the combustion furnace, this pipe being equipped with two heat exchangers.

Process for reforming impure methanol

Process for separating a gaseous mixture by adsorption includes the steps of: (a) a cocurrent isobaric production (f.sub.p1 -f.sub.p2); (b) a pressure equalization between the adsorber undergoing decompression and another adsorber undergoing countercurrent recompression (f.sub.c1 -N.sub.4); (c) a cocurrent partial emptying to a reservoir (f); (d) a final countercurrent decompression (f.sub.a); (e) a countercurrent scavenging by the gas of the reservoir (f.sub.b); (f) a countercurrent partial recompression by at least one pressure equalization (f'.sub.e); (g) a countercurrent final recompression (f'.sub.di -F'.sub.d2); in which process the sum of the duration of the operations according to (c) and (d) is less than said phase shift and the sum of the durations of the operations according to (c), (d) and (e) is less than twice said phase shift; (h) at least two adsorbers are simultaneously in isobaric production, wherein: (i) the number of adsorbers is at least equal to four and less than 3+x+y, x and y being respectively the number of adsorbers in production and the number of pressure equalizations; (j) the emptying is introduced into the storage reservoir; (k) each pressure equalization is 'direct'.

Process and plant for separating a gaseous mixture by adsorption

The gas originating from the expansion during the stage (T.sub.6) is directed into a buffer tank and each adsorber has an operating cycle delayed by 1/nth of the cycle period (T) with respect to a preceding one, and each production stage has a duration of (x/n)T, 'n' being greater than or equal to 6, and 'x' greater than or equal to 2, and each expansion stage at an intermediate pressure has a shorter duration than each elution stage.

Adsorption processes

The method of treatment of a mixture of air and at least partially radioactive gases such as xenon and krypton in particular, especially gaseous effluents derived from the reprocessing of irradiated nuclear fuels, comprises a stage of concentration of the rare gases in solution in liquid oxygen by cryogenic distillation of the light gases and especially nitrogen from the liquefied mixture.

Method of treatment of a mixture of air and at least partially

An improved method of fractionation of a gaseous mixture by adsorption, in which the efficiency of extraction and the content of the desired constituent in the gaseous fraction extracted are increased, the method utilizing two or more adsorption lines, each including at least one adsorber comprising an adsorbent mass which preferentially adsorbs at least one constituent of the gaseous mixture, the first adsorption line comprising:

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Paris, France

Guy Simonet