摘要:
Conventional plant to produce peroxomonosulphuric acid (Caro's acid) is large and emphasises extensive cooling, so that it is awkward to transport, can be cumbersome to install beside existing plant and can suffer from relatively expensive capital and/or running costs. In the present invention, Caro's acid is generated continuously in relatively small plant adiabatically, by introducing concentrated hydrogen peroxide (8) into a stream of concentrated sulphuric acid in a reaction chamber (5) dimensioned so that the throughput is very fast. In particularly suitable embodiments, the reaction chamber is annular at the points of introduction of the reagents, its width being greater in the vicinity of the hydrogen peroxide inlet than in the vicinity of the sulphuric acid inlet (7). The hydrogen peroxide inlet (8) is preferably angled backwardly so that its encounter angle with the sulphuric acid stream is over 90 to about 165°.
摘要:
Transition metal ions have the ability to increase the oxidation performance of the inorganic peroxy salts at room temperature by possibly lowering their activation energy or by producing more reactive free radicals. When two transition metal salts are used togeher to decompose dipersulfate, it provides synergistic oxidati on activity, better than that obtained by dipersulfate or dipersulfate with either copper or zinc alone. The transition metals mentioned are the water soluble salts of copper and zinc. Oxidation performance of sodium dipersulface in presence of catalytic amou nt of copper and zinc salts was determined by measuring the dest ruction of crystal violet dye at a wavelength of 589 nm.
摘要:
A device, comprising a conduit for an aqueous stream, a mixing tube located inside the conduit, having a static mixer inside the mixing tube, an outlet open to the conduit and an inlet, a sulphuric acid supply tube connected to the inlet of the mixing tube and a hydrogen peroxide supply tube, arranged inside the sulphuric acid supply tube and having an outlet for hydrogen peroxide at the inlet of said mixing tube, and a method, where an aqueous stream is passed through the conduit of the device, 85 to 98 % by weight sulphuric acid is introduced to the sulphuric acid supply tube of the device and 50 to 80 % by weight aqueous hydrogen peroxide solution is introduced to the hydrogen peroxide supply tube of the device, provide a dilute aqueous solution of peroxomonosulphuric acid without a risk of exposing operating personnel to concentrated peroxomonosulphuric acid.
摘要:
A process is disclosed for producing Caro's acid by introducing hydrogen peroxide of at least 50 % by weight through a first feed line (7) into a first reactor conduit and sulfuric acid having a concentration of at least 85 % by weight through a second feed line (15) through a second reactor conduit so that the hydrogen peroxide and sulfuric acid are independently injected into a baffled, plug flow mixing reactor (22) without substantial premixing of the hydrogen peroxide and sulfuric acid, and removing a Caro's acid reaction mixture from the exit end (26) of the plug flow mixing reactor.
摘要:
A process for reducing or eliminating Caro's acid mist, created when producing a hot mixture containing Caro's acid by reaction of sulfuric acid and hydrogen peroxide, is carried out by quenching the hot Caro's acid mixture with water to both cool and dilute the Caro's acid.
摘要:
Production of peroxomonosulphuric acid (Caro's acid) by reaction between concentrated hydrogen peroxide and sulphuric acid solutions can be impaired substantially when substoichiometric amounts of sulphuric acid are employed. The problem is ameliorated or removed by first forming a body of sulphuric acid-rich fluid (usually the smaller volume) and thereafter introducing into that body of fluid the hydrogen peroxide solution (usually the larger volume). The reaction mixture progressively becomes sulphuric acid-lean. The body of fluid is advantageously either concentrated sulphuric acid itself, or a premix formed by reaction between hydrogen peroxide and at least an equimolar amount of sulphuric acid. The process is particularly suitable for making Caro's acid when from 0.02 to 0.5 moles of sulphuric acid is employed per mole of hydrogen peroxide.