Abstract: The invention relates to a process for treating a waste lye of a lye scrub using an oxidation reactor (100), the waste lye and oxygen or an oxygen-containing gas mixture being introduced into the oxidation reactor (100) and steam being introduced into the oxidation reactor (100). It is provided that the steam is at least partially introduced by means of a steam feeding device (10), which has a cylindrical section (11) with a centre axis (12) and a wall (13), the centre axis (12) being aligned perpendicularly, a number of groups of openings (14) being formed in the wall, each of the groups comprising a number of the openings (14), and the number of openings (14) of each of the groups being arranged in one or more planes (15) that is or are in each case aligned perpendicularly to the centre axis (12). A corresponding installation and also a corresponding oxidation reactor (100) are likewise the subject of the present invention.

Abstract: The invention relates to a process for treating a waste lye of a lye scrub in which the waste lye is fed with oxygen or an oxygen-containing gas mixture and steam to an oxidation unit (1) and in the latter is subjected to a wet oxidation for a reaction time period at a first temperature level and a first pressure level, a three-phase component mixture, which comprises a gas phase, a liquid phase and solid particles, being removed from the oxidation unit (1) and subjected to a cooling and phase separation. It is provided that the three-phase component mixture in an unchanged composition is first subjected to an expansion from the first pressure level to a second pressure level and thereby cooled down to a second temperature level, and that the three-phase component mixture expanded to the second pressure level and cooled down to the second temperature level is subsequently subjected at least partly to a further cooling to a third temperature level and after that to a phase separation.

Abstract: The invention relates to a process for treating a waste lye of a lye scrub using an oxidation reactor (100), the waste lye and oxygen or an oxygen-containing gas mixture being introduced into the oxidation reactor (100) and steam being introduced into the oxidation reactor (100). It is provided that the steam is at least partially introduced by means of a steam feeding device (10), which has a cylindrical section (11) with a centre axis (12) and a wall (13), the centre axis (12) being aligned perpendicularly, a number of groups of openings (14) being formed in the wall, each of the groups comprising a number of the openings (14), and the number of openings (14) of each of the groups being arranged in one or more planes (15) that is or are in each case aligned perpendicularly to the centre axis (12). A corresponding installation and also a corresponding oxidation reactor (100) are likewise the subject of the present invention.

Abstract: The invention relates to a process for treating a sulfide-containing waste lye from a lye scrub in which the waste lye and oxygen or an oxygen-containing gas mixture is fed to an oxidation reactor (10) and in the latter is subjected to a wet oxidation, steam being fed into the oxidation reactor (10). It is provided that an oxidation reactor (10) with a number of chambers (11-19), of which a first chamber (11) has a greater volume than a second chamber (12), is used, the waste lye and the oxygen or the oxygen-containing gas mixture being fed to the first chamber (11), fluid flowing out of the first chamber (11) being transferred into the second chamber (12), the steam quantity and/or steam temperature of the steam fed into the oxidation reactor (10) being controlled by a control device (TIC), and the steam fed into the oxidation reactor (10) being at least partially fed into the first chamber (11) and into the second chamber (12).