Process for the Preparation of Calcium Superoxide.
Authors
Ballou EV; Wood PC; Wydeven TJ; Spitze LR
Source
U S Pat 4 101 644 1978 Jul; :
Link
NIOSHTIC No.
10012041
Abstract
Calcium superoxide is prepared in high yields by spreading a quantity of calcium peroxide piperoxyhydrate on the surface of a container over an area of 18 to 300 cm2/g of diperoxyhydrate; positioning said container in a vacuum chamber on a support structure through which a coolant fluid can be circulated; partially evacuating the chamber, allowing the temperature of the diperoxyhydrate to reach approximately 0 deg to approximately 40 deg c with the use of external heating or cooling fluid as needed, maintaining the temperature for a sufficient time to complete the disproportionation of the diperoxyhydrate to calcium superoxide, calcium hydroxide, oxygen, and water; while maintaining a partial vacuum, constantly and systematically removing the water as it is formed by sweeping the chamber with a current of dry inert gas and/or by condensing the water on a cold surface; and finally recovering the calcium superoxide produced. Calcium peroxide diperoxyhydrate is prepared by adding to cao2.8H2o sufficient concentrated h2o2 to effect the chemical transformation. Maintain the temperature at -15.5 Deg to -15.0 Deg c for 0.75 to 2 h. Filter, wash with dry isopropanol at -15 deg to -18.5 Deg c. Filter again and dry in a stream of co2-free air at relative humidity of 0- 0.5 pct. Store at -10 deg c, or preferably at -195 deg c (liquid n2). Note: it is not clear why this patent is listed as a Bureau patent, as the inventors are not Bureau of Mines personnel, and the patent appears to have been assigned to the National Aeronautics and Space Administration.
Publication Date
19780701
Document Type
PA;
Fiscal Year
1978
Identifying No.
PAT 4,101,644
NIOSH Division
WO;
Source Name
U.S. Pat. 4,101,644, July 18, 1978; Chem. Abstr. Not Found
Links with this icon indicate that you are leaving the CDC website.
The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website.
Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
You will be subject to the destination website's privacy policy when you follow the link.
CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website.
For more information on CDC's web notification policies, see Website Disclaimers.
CDC.gov Privacy Settings
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.
Thank you for taking the time to confirm your preferences. If you need to go back and make any changes, you can always do so by going to our Privacy Policy page.