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(CH3)2-CO2 [1 record]

Record 1 2011-04-20


Subject field(s)
  • Chemical Elements and Compounds
  • Pulp Preparation (papermaking)
Universal entry(ies)
formula, see observation

An activated oxygen compound which was] developed at Paprican [Pulp and Paper Research Institute of Canada], but not in commercial use, which appears under the form of] a three-membered ring peroxy compound, [which is] produced by various means, [one of them being by] the reaction of monoperoxysulphate with a dilute aqueous solution of acetone, [a solution which can be used to bleach] pulp.


DMD is the most selective non-chlorine bleaching agent known, and reacts with residual lignin in a way similar to chlorine and chlorine dioxide. In particular, DMD has the selectivity equivalent to chlorine dioxide in the bleaching of low-Kappa pulp, for example, a Kappa of less than 7 to 8 units.


DMD: This might be an in-house or a non-recognized abbreviation; not to be used alone, to avoid any risk of confusion.


Chemical formula: (CH3)2-CO2


  • Éléments et composés chimiques
  • Préparation de la pâte à papier
Entrée(s) universelle(s)
formula, see observation

Peroxyde cyclique [utilisé] dans un procédé de blanchiment développé par Paprican [Institut canadien de recherches sur les pâtes et papiers, qui] est synthétisé lors de la réaction entre l'acide peroxymonosulfurique et l'acétone à pH 7-8, [mais qui n'est pas utilisé dans le commerce à l'heure actuelle].


Le DMD est l'agent de blanchiment non chloré le plus sélectif connu à ce jour. Il réagit avec la lignine résiduaire de façon similaire au chlore et au bioxyde de chlore. Le DMD possède une sélectivité équivalente à celle du dioxyde de chlore en ce qui concerne le blanchiment des pâtes de faibles indices kappa (moins de 7-8).


DMD : abréviation non officielle; ne pas l'utiliser seule, pour éviter tout risque de confusion.


Formule chimique : (CH3)2-CO2


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