Acetylation method for material containing cellulose, and...

C - Chemistry – Metallurgy – 08 – B

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C08B 3/06 (2006.01) C08H 8/00 (2010.01) C08H 5/04 (2006.01)

Patent

CA 2126614

A acetylating agent vapor is brought into contact with a material containing cellulose while continuously moving the acetylating agent, and thereby, the material containing cellulose is acetylated in a vapor phase. Solvents for dilution, catalysts, and an immersion process in an acetylating agent (liquid) are not necessary, and thereby, it is not merely the case that the process is simplified, but the acetylation period is shortened as a result of the increase in reaction efficiency, and the accumulation of excess heat of reaction in the material containing cellulose during the reaction is prevented, and thereby, the uniformity of acetylation is improved. Furthermore, in the present invention, wooden strips acetylated by this method are accumulated and modified wood is manufactured. This modified wood has superior resistance to moisture, possesses no acetic acid odor, and does not cause rusting.

Une vapeur d'agent acétylant est amenée en contact avec une matière contenant de la cellulose pendant que l'agent acétylant est continuellement en circulation; de ce fait, la matière contenant de la cellulose est acétylée dans une phase vapeur. Les solvants de dilution, les catalyseurs et un procédé d'immersion dans un agent acétylant (liquide) ne sont pas nécessaires et, ainsi, non seulement le procédé est-il simplifié, mais la période d'acétylation est raccourcie en raison de l'augmentation de l'efficacité de la réaction; de plus, on prévient ainsi l'accumulation d'un excès de chaleur de réaction dans la matière contenant la cellulose durant la réaction, ce qui améliore l'uniformité de l'acétylation. De plus, dans la présente invention, des bandes de bois acétylées par la présente méthode sont rassemblées pour fabriquer du bois modifié. Ce bois modifié possède une résistance supérieure à l'humidité, n'a pas d'odeur d'acide acétique et n'entraîne pas la corrosion.

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