Snamprogetti S.p.a.

Gianfranco Soldati

Carlo Rescalli

Luigi Gazzi

Alessandro Vetere

Alessandro Ginnasi

Giancarlo Cotone

A process is described for stripping acidic gases, mainly hydrogen sulphide and carbon dioxide, from natural gas or synthesis gas, especially when the percentages of such acidic gases are high and the conventional processes become economically objectionable. The process is based on the use of a number of selective solvents, generally belonging to the class of esters, ethers, mixed ester-ethers and lactones, in combination with sequential absorbing cycles which start from the stripping of hydrogen sulphide, and comprise the regeneration of the solvents used by several expansion cycles: H.sub.2 S and CO.sub.2 are recovered and the regenerated solvents recycled.

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S. Donato Milanese, Italy

Gianfranco Soldati