The invention relates to a method for selective desulphurisation of a synthetic raw gas. The invention relates to a method for operating a gas scrubbing plant, wherein a feed gas (1) containing hydrogen, carbon monoxide, carbon dioxide and carbonyl sulphide and/or hydrogen sulphide is scrubbed in a scrubbing facility (A1) by a scrubbing agent (3, 4) pre-charged with carbon dioxide in order to largely remove the sulphur components selectively from the feed gas and produce a desulphurised gas stream (5, 9). The invention is characterised in that a sulphur-free scrubbing agent (3, 4) is used that has a carbon dioxide partial pressure upon its introduction into the scrubbing facility (A1) which is greater than or equal to the carbon dioxide partial pressure in the feed gas (1) to be desulphurised.