Societe Nationale Elf Aquitaine (production)

Elf Aquitaine Production

Institut Francais Du Pe'trole

Jacques Tournier-Lasserve

Jean Elgue

Charles Cameron

Patrick Chaumette

Jacques Bousquet

Quang Dang Vu

Guy Desgrandchamps

Henri Gongora

The invention concerns steps in a process for the synthesis of at least one alkyl tertiobutyl ether, preferably respectively MTBE or ETBE, from at least one alcohol and from isobutene, each synthesized at least partially from natural gas. The alcohol, preferably methanol or ethanol respectively, is synthesized at least partially from synthesis gas, a portion of said synthesis gas being prepared in a natural gas steam prereforming zone. The isobutene is synthesized in a series of processes which includes direct transformation of natural gas to ethylene, known as oxidative coupling of methane (OCM), dimerisation of ethylene to normal butene, isomerisation of n-butene to isobutene, and the separation units associated therewith.

Steps in a process for the production of at least one alkyl tertiobutyl

Process for removing hydrogen sulfide at low concentration in a gas containing water vapor. The gas is cooled to a temperature below the dew point of water, which condenses and separates the water. The dry gas is scrubbed free of hydrogen sulfide by an H.sub.2 S-absorbent solvent forming a purified gas. The purified gas is contacted and rehydrated with heated water so that the water content as water vapor corresponds to a mass flow rate of water substantially equal to the mass flow rate of the water present in the H.sub.2 S-containing gas before cooling. An apparatus for carrying out the process is disclosed.

Process and device for removal of H.sub.2 S

Process and device for the removal of H.sub.2 S

Continuous manufacture of an alkane sulphonyl chloride by the action of chlorine on the dialkyl disulphide corresponding to the alkane, in the presence of water or an aqueous hydrochloric acid solution. Firstly, a fine emulsion of the dialkyl disulphide is prepared with water or with an aqueous hydrochloric acid solution, after which the emulsion is treated with chlorine under constant agitation. Preferably, separation of the alkane sulphonyl chloride formed is effected in two different zones, the second of which operates under reduced pressure.

Manufacture of alkane sulphonyl chlorides

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Pau, France

Jacques Tournier-Lasserve