Method for Dehydrating Metal Chlorides

Details

• Personal Author:
  Bauer, Donald J. ; Eisele, Judith A.
• Description:
  A hydrated metal salt is dehydrated to its anhydrous form by dissolving the metal salt hydrate in an organic solvent and contacting the solvent solution of metal salt hydrate with a molecular sieve of a pore size sufficient to permit the absorption of water molecules but of a size too small to absorb solvent molecules. Thus, 2.79 G of hydrated ZnCl2 was dissolved in 250 ml of ethanol. Analysis of the solution showed it to be 0.046M in H2O and 0.076M in ZnCl2, thus indicating a hydrate composition of ZnCl2.1/2H2O. Fifty milliliters of the solution were contacted with 10 g of a commercial molecular sieve that is a type a synthetic zeolite having an effective pore size of 3 angstroms, which was activated by heating at 250 deg C. After 3 h, analysis of the solution indicated a salt composition of ZnCl2.1/7H2O. After 22 h, analysis showed anhydrous ZnCl2. Again, 1.53 G of hydrated MnCl2 was dissolved in ethanol. Analysis showed a content of 0.151M H2O and 0.060M MnCl2, for an overall composition of MnCl2.2-1/2H2O. After contracting with a molecular sieve for 2 h as described above, analysis showed a composition of MnCl2.1/2H2O and after 24 h the composition was MnCl2.0.12H2O. [Description provided by NIOSH]
• Subjects:
  Chemistry Metals Minerals Occupational Health Safety
• Keywords:
  Chemical-extraction Chemical-processing Chemical-reactions Metallic-compounds Metallic-salts Mineral-processing
• Series:
  Mining Publications
• Document Type:
  Text
• Genre:
  Other
• Place as Subject:
  Nevada ; OSHA Region 9
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  RERC - Reno Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-7
• NIOSHTIC Number:
  nn:10012042
• Citation:
  US Pat 4,105,747 1978 Aug; :1-7
• Federal Fiscal Year:
  1978
• Peer Reviewed:
  False
• Source Full Name:
  United States Patent 4,105,747
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:ab44d7e1e1fdadc2ec51e8db78005a1f5739009514e6105f2c8fa7dcca4e7807873f5e0569dc6c0b144fd015c8728cb28f95aaaba25390ca297e3e0ff2e2344d
• Download URL:
  https://stacks.cdc.gov/view/cdc/220223/cdc_220223_DS1.pdf
• File Type:
  [PDF - 445.78 KB ]