US 11,555,158 B2Granted

Process and plant for producing a plurality of gas products from shifted and unshifted crude synthesis gas

AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude

InventorsAlfred Gubrinski, Pankaj Puri, Sharon Corbet, Dorit Rappold

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Abstract

The invention relates to a gas scrubbing process and a corresponding plant for removal of acidic gas constituents from crude synthesis gas which make it possible by treatment of shifted and of unshifted crude synthesis gas in the gas scrubbing process and by combination of the thus-obtained partial product streams to produce a plurality of gas products having different compositions. In addition, the invention ensures that the flash gases obtained during decompression of the laden scrubbing medium are utilized materially and/or energetically in advantageous fashion.

Claims7

Dependent claims

A process for purifying a shifted crude synthesis gas and an unshifted crude synthesis gas by gas scrubbing with a scrubbing medium and for producing a plurality of synthesis gas product streams having different H2/CO ratios comprising:

(a) providing and supplying the shifted crude synthesis gas and the unshifted crude synthesis gas to respective separate prescrubbers for removal of trace components
(b) supplying the gaseous tops products from the prescrubbers to respective separate H2S scrubbers for removal of H2S,
(c) supplying the gaseous tops products from the H2S scrubbers to respective separate CO2 scrubbers for removal of CO2,
(d1) dividing the gaseous tops product stream from the CO2 scrubber for the unshifted crude synthesis gas into a first synthesis gas partial product stream and into a second synthesis gas partial product stream which for pressure reduction is passed through a multi-stage expander to recover mechanical work and refrigeration and to obtain an expanded second synthesis gas partial product stream,
(d2) dividing the gaseous tops product stream from the CO2 scrubber for the shifted crude synthesis gas into a third synthesis gas partial product stream and into a fourth synthesis gas partial product stream,
(e) supplying the liquid bottoms products from the separate prescrubbers to an intermediate-pressure prescrubbing flash vessel, supplying the gaseous tops product from the intermediate-pressure prescrubbing flash vessel to a recompressor, supplying the liquid bottoms product from the intermediate-pressure prescrubbing flash vessel to a low-pressure prescrubbing flash vessel, supplying the gaseous tops product from the low-pressure prescrubbing flash vessel to the recompressor, supplying the liquid bottoms product from the low-pressure prescrubbing flash vessel to at least one apparatus for flash regeneration and/or hot regeneration of the scrubbing medium,
(f) supplying the liquid bottoms products from the separate H2S scrubbers to an intermediate-pressure H2S flash vessel, supplying the gaseous tops product from the intermediate-pressure H2S flash vessel to the recompressor, supplying the liquid bottoms product from the intermediate-pressure H2S flash vessel to a low-pressure H2S flash vessel, supplying the gaseous tops product from the low-pressure H2S flash vessel to the recompressor, supplying the liquid bottoms product from the low-pressure H2S flash vessel to at least one apparatus for flash regeneration and/or hot regeneration of the scrubbing medium,
(g) supplying the liquid bottoms products from the separate CO2 scrubbers to an intermediate-pressure CO2 flash vessel, supplying the gaseous tops product from the intermediate-pressure CO2 flash vessel to the recompressor, supplying the liquid bottoms product from the intermediate-pressure CO2 flash vessel to a low-pressure CO2 flash vessel, supplying the gaseous tops product from the low-pressure CO2 flash vessel to the low-pressure H2S flash vessel and/or to the recompressor, supplying the liquid bottoms product from the low-pressure CO2 flash vessel to at least one apparatus for flash regeneration and/or hot regeneration of the scrubbing medium, and
(h) recycling the gas stream compressed by the recompressor to the prescrubber for the unshifted crude synthesis gas and/or the shifted crude synthesis gas.

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Dependencies are inferred from the claim text.

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Abstract

(a) providing and supplying the shifted crude synthesis gas and the unshifted crude synthesis gas to respective separate prescrubbers for removal of trace components
(b) supplying the gaseous tops products from the prescrubbers to respective separate H2S scrubbers for removal of H2S,
(c) supplying the gaseous tops products from the H2S scrubbers to respective separate CO2 scrubbers for removal of CO2,
(d1) dividing the gaseous tops product stream from the CO2 scrubber for the unshifted crude synthesis gas into a first synthesis gas partial product stream and into a second synthesis gas partial product stream which for pressure reduction is passed through a multi-stage expander to recover mechanical work and refrigeration and to obtain an expanded second synthesis gas partial product stream,
(d2) dividing the gaseous tops product stream from the CO2 scrubber for the shifted crude synthesis gas into a third synthesis gas partial product stream and into a fourth synthesis gas partial product stream,
(e) supplying the liquid bottoms products from the separate prescrubbers to an intermediate-pressure prescrubbing flash vessel, supplying the gaseous tops product from the intermediate-pressure prescrubbing flash vessel to a recompressor, supplying the liquid bottoms product from the intermediate-pressure prescrubbing flash vessel to a low-pressure prescrubbing flash vessel, supplying the gaseous tops product from the low-pressure prescrubbing flash vessel to the recompressor, supplying the liquid bottoms product from the low-pressure prescrubbing flash vessel to at least one apparatus for flash regeneration and/or hot regeneration of the scrubbing medium,
(f) supplying the liquid bottoms products from the separate H2S scrubbers to an intermediate-pressure H2S flash vessel, supplying the gaseous tops product from the intermediate-pressure H2S flash vessel to the recompressor, supplying the liquid bottoms product from the intermediate-pressure H2S flash vessel to a low-pressure H2S flash vessel, supplying the gaseous tops product from the low-pressure H2S flash vessel to the recompressor, supplying the liquid bottoms product from the low-pressure H2S flash vessel to at least one apparatus for flash regeneration and/or hot regeneration of the scrubbing medium,
(g) supplying the liquid bottoms products from the separate CO2 scrubbers to an intermediate-pressure CO2 flash vessel, supplying the gaseous tops product from the intermediate-pressure CO2 flash vessel to the recompressor, supplying the liquid bottoms product from the intermediate-pressure CO2 flash vessel to a low-pressure CO2 flash vessel, supplying the gaseous tops product from the low-pressure CO2 flash vessel to the low-pressure H2S flash vessel and/or to the recompressor, supplying the liquid bottoms product from the low-pressure CO2 flash vessel to at least one apparatus for flash regeneration and/or hot regeneration of the scrubbing medium, and
(h) recycling the gas stream compressed by the recompressor to the prescrubber for the unshifted crude synthesis gas and/or the shifted crude synthesis gas.

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