Patent ES-8603342-A1 (ES)
Title: Hydrogen peroxide process.
IPC: C01B15/023
Filed: 1984-10-02
Abstract: The process of manufacturing hydrogen peroxide including the steps of reducing, oxidising, and extracting a working com-pound selected from a substituted anthraquinone, the equivalent 5,6,7,8-tetrahydro anthraquinone, the anthrahydro-quinone derivatives and mixtures thereof, the working compound being dissolved in an inert solvent to comprise a working solution, said oxidising step comprising contacting the working solution from the reducing step with a gas containing oxygen at a pressure of at least 275 kilopascals thereby converting at least part of the hydroquinone form of the working compound to hydrogen peroxide and the corresponding anthraquinone form of the working compound, characterised byrecovering solvent from effluent gas from said oxidising step by : (a) adjusting the energy content of the effluent gas so that the temperature after step (b) is greater than the temperature at which ice crystals can be formed, (b) converting part of the energy content of the effluent gas from the oxidising step into mechanical energy by causing the effluent gas to expand and be reduced in temperature below the dewpoint of the solvent thereby condensing solvent, and (c) collecting the condensed solvent. - (5pp) EPAB- EP-174411 B The process of manufacturing hydrogen peroxide including the steps of reducing, oxidising, and extracting a working com-pound selected from a substituted anthraquinone, the equivalent 5,6,7,8-tetrahydro anthraquinone, the anthrahydro-quinone derivatives and mixtures thereof, the working compound being dissolved in an inert solvent to comprise a working solution, said oxidising step comprising contacting the working solution from the reducing step with a gas containing oxygen at a pressure of at least 275 kilopascals thereby converting at least part of the hydroquinone form of the working compound to hydrogen peroxide and the corresponding anthraquinone form of the working compound, characterised byrecovering solvent from effluent gas from said oxidising step by : (a) adjusting the energy content of the effluent gas so that the temperature after step (b) is greater than the temperature at which ice crystals can be formed, (b) converting part of the energy content of the effluent gas from the oxidising step into mechanical energy by causing the effluent gas to expand and be reduced in temperature below the dew point of the solvent thereby condensing solvent, and (c) collecting the condensed solvent. - EP-174411 B The process of manufacturing hydrogen peroxide including the steps of reducing, oxidising, and extracting a working com-pound selected from a substituted anthraquinone, the equivalent 5,6,7,8-tetrahydro anthraquinone, the anthrahydro-quinone derivatives and mixtures thereof, the working compound being dissolved in an inert solvent to comprise a working solution, said oxidising step comprising contacting the working solution from the reducing step with a gas containing oxygen at a pressure of at least 275 kilopascals thereby converting at least part of the hydroquinone form of the working compound to hydrogen peroxide and the corresponding anthraquinone form of the working compound, characterised byrecovering solvent from effluent gas from said oxidising step by : (a) adjusting the energy content of the effluent gas so that the temperature after step (b) is greater than the temperature at which ice crystals can be formed, (b) converting part of the energy content of the effluent gas from the oxidising step into mechanical energy by causing the effluent gas to expand and be reduced in temperature below the dewpoint of the solvent thereby condensing solvent, and (c) collecting the condensed solvent. (5pp) USAB- US4485084 A H2O2 is made by a cycle involving (1) reducing a working soln. (contg. a substd. anthraquinone (I), the corresp. 5,6,7,8-tetrahydro cpds. and/or anthrahydroquinone deriv) (2) oxidising the reduced soln. with O2-contg. gas at at least 275 kPa to convert the hydroquinone form to H2O2 and (I), then (3) extracting. - This is improved when solvent is recovered from the effluent gas of the oxidn. step by expanding the effluent so that it is cooled to below the dew point of the solvent, which is thus condensed. The heat content of the effluent is controlled so that after expansion its temp. is still high enough to prevent formation of ice crystals.