Invention Grant
- Patent Title: Process and apparatus for the electrolysis of an aqueous solution of hydrogen chloride or alkali chloride in an electrolytic cell
- Patent Title (中): 在电解池中电解氯化氢或氯化碱水溶液的方法和装置
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Application No.: US13375327Application Date: 2010-05-28
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Publication No.: US08747647B2Publication Date: 2014-06-10
- Inventor: Walter Bachleitner , Christoph Erdmann , Joachim Rohovec , Andreas Bulan , Mathias Weis
- Applicant: Walter Bachleitner , Christoph Erdmann , Joachim Rohovec , Andreas Bulan , Mathias Weis
- Applicant Address: DE Sulzbach DE Leverkusen
- Assignee: Messer Group GmbH,Bayer Material Science AG
- Current Assignee: Messer Group GmbH,Bayer Material Science AG
- Current Assignee Address: DE Sulzbach DE Leverkusen
- Agent Laurence A. Greenberg; Werner H. Stemer; Ralph E. Locher
- Priority: DE102009023539 20090530
- International Application: PCT/EP2010/003253 WO 20100528
- International Announcement: WO2010/139425 WO 20100912
- Main IPC: C25B1/26
- IPC: C25B1/26 ; C25B1/46 ; C25B15/08 ; H01M8/04

Abstract:
In a process for chlorine-alkali electrolysis, use is made of an oxygen depletion cathode. The process is run with a high excess of oxygen. The oxygen needed for this is provided for a device of the gas separation, for example a VPSA plant or an air fractionation plant. The large quantities of oxygen produced lead to considerable costs of the process. According to the invention, the oxygen-rich atmosphere remaining after passing through the process is fed back into the device for gas separation as input gas. The device the gas separation is therefore operated with an oxygen-rich input gas and therefore produces a larger quantity of oxygen-rich gas, which in turn is fed to the oxygen depletion cathode. As a result of the circulation of the gas, the economy of the overall process is increased considerably.
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