TERMIUM Plus®

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METHYL MAGNESIUM CARBONATE [1 record]

Record 1 2011-01-24

English

Subject field(s)
  • Chemical Elements and Compounds
  • Paper Manufacturing Processes
Universal entry(ies)
CH3OMgOCO2CH3·xCO2
formula, see observation
OBS

An organic compound, CH3OMgOCO2CH3·xCO2, with x being variable depending on the solvent used. It is prepared by treating a solution of magnesium methoxide with carbon dioxide until saturation is attained. The resulting solution is clear, colorless, and has a pH of approximately 7.0. It has been recommended as a non-aqueous deacidifying agent for paper, preferably in low concentrations, e.g., 0.7 to 1.0%. Its advantages are said to be: 1) a mild pH, due to the neutral character of the solution and direct conversion to magnesium carbonate upon hydrolysis; and 2) convenience of use due to the decreased sensitivity of the solution to water, which assists in preventing premature precipitation.

OBS

Chemical formula: (CH3OMgOCO2CH3·xCO2) with x being variable depending on the solvent used.

French

Domaine(s)
  • Éléments et composés chimiques
  • Fabrication du papier
Entrée(s) universelle(s)
CH3OMgOCO2CH3·xCO2
formula, see observation
DEF

Produit chimique utilisé dans la désacidification du papier ainsi que pour préserver ce dernier.

CONT

Pour éliminer l'acidité interne des papiers, les bibliothèques ont recours à la désacidification de masse du papier. Il s'agit de neutraliser l'acide fort ou faible par une base forte. [...] Les procédés de désacidification de masse sont nombreux : - procédé au carbonate de méthylmagnésium, utilisé par la Bibliothèque Nationale. - procédé Bookkeeper. - procédé au diéthyl-zinc. - procédé lithco-FMC. - procédé Booksaver. - procédé de la British library.

OBS

Formule chimique : CH3OMgOCO2CH3·xCO2, la variable «x» étant fonction du solvant utilisé.

Spanish

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