Classifications

• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
  • C25B1/00—Electrolytic production of inorganic compounds or non-metals
  • C25B1/01—Products
  • C25B1/28—Per-compounds
  • C25B1/30—Peroxides

Definitions

• the present invention relates to an improvement in the manufacture of hydrogen peroxide by cathodic reduction of oxygen, more particularly it relates to a process in 5 which the same current of oxygen or of the oxygneg-containing gas, for the wor g ofthe electrol ic cell, is used for the concentration or distillation of the h drogen peroxide solution produced in t electrolytic cell.
• the cost of concentrating is considerabl reduced, if the current of oxygen or o the oxygen-containin gas required to produce a thorough stirring in the electrolytic cell is utilized in the manner known per se forthe concentration or distillation of the hydrogen peroxide solutions produced in the electrolytic cell.
• the concentration can be effected in the electrolysis vessel during the electrolysis by drying the oxygen or the oxygen-containing gas or at any rate taking precautions that it reaches the electrolytic cell containing less water than corresponds to the degree of saturation at the temperature of the electrolytic cell.
• the 0' gen or t e oxygen-congas is cooled fore entering the electrolytlc cell to the temperature of the latter.
• the temperature in an electrolytic cell amounts to 13 C. and more than C. in the evaporation apparatus (cons of a trickling tower, which can be hea and that the current of gas is cooled to 13 C. after leaving the trickling tower, the quantity of gas necessary for stirring suflices to concentrate a one per cent. hydrogen peroxmall ide solution, flowing continually from the electrolytic cell, to a 30 per cent solution.
• Anotherpracticable mode of working consists in keeping the temperature in the electrolysis and concentration apparatus, at least in parts thereof, substantially uniform, in which case the oxygen or oxygen-containing for example air, is dried before entermg the concentration vessel. In this manner, for example, it is possible to concentrate a certain quantity of a one percent solution produced in the electrolysis vessel to 30% y the stream of oxygen needed for its production. Finall it may be advantageous to work in suc a manner that the water evaporating in the concentration apparatus is condensed in'the suitably cooled electrolysis apparatus. With this mode of execution the constant replenishing of the cathode liquor required for continuous working becomes to arlal'ge extent automatic.
• the production, concentration and distillation of the hydrogen peroxide solution may be carried out simultaneously in a single cycle p9 of operations.
• the process thus offers the possibility of producing in a very economical manner and in one process highly concentrated and pure hydrogen peroxide solutions by the cathodic 85 reduction of oxygen.
• the steps which comprise concentrating the hydrogen peroxide solution produced in the'electrolytic cell by passing through it p 10 the same current of oxygen which is required for the working of the electrolytic cell, said concentration or distillation step being carried out in an apparatus separate from the electrolytic cell, and maintaining the eva ration apparatus or parts thereof at a high r temperature than the electrolysis apparatus.

Landscapes

• Chemical & Material Sciences (AREA)
• Inorganic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6581999

Family Applications (1)

Country Status (2)

Cited By (1)

• 1928
  • 1928-05-23 FR FR654592D patent/FR654592A/fr not_active Expired
  • 1928-06-21 US US267347A patent/US1847492A/en not_active Expired - Lifetime

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