Absorption media for irreversibly gettering thionyl chloride

Patent · Mon Dec 31 23:00:00 EST 2001

OSTI ID:874836

Buffleben, George ^[1]; Goods, Steven H ^[2]; Shepodd, Timothy ^[2]; Wheeler, David R ^[3]

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1. Tracy, CA
2. Livermore, CA
3. Albuquerque, NM

Thionyl chloride is a hazardous and reactive chemical used as the liquid cathode in commercial primary batteries. Contrary to previous thinking, ASZM-TEDA.RTM. carbon (Calgon Corporation) reversibly absorbs thionyl chloride. Thus, several candidate materials were examined as irreversible getters for thionyl chloride. The capacity, rate and effect of temperature were also explored. A wide variety of likely materials were investigated through screening experiments focusing on the degree of heat generated by the reaction as well as the material absorption capacity and irreversibility, in order to help narrow the group of possible getter choices. More thorough, quantitative measurements were performed on promising materials. The best performing getter was a mixture of ZnO and ASZM-TEDA.RTM. carbon. In this example, the ZnO reacts with thionyl chloride to form ZnCl.sub.2 and SO.sub.2. The SO.sub.2 is then irreversibly gettered by ASZM-TEDA.RTM. carbon. This combination of ZnO and carbon has a high capacity, is irreversible and functions effectively above -20.degree. C.

• Research Organization: SANDIA CORP
• DOE Contract Number: AC04-94AL85000
• Assignee: Sandia National Laboratories (Livermore, CA)
• Patent Number(s): US 6471886
• OSTI ID: 874836
• Country of Publication: United States
• Language: English

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