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Method and apparatus for controlling the catalytic oxidation of cellulose

一种催化氧化、纤维素的技术，应用在化学仪器和方法、纤维素纸浆后处理改性、使液体与液体反应的化学方法等方向

Active Publication Date: 2017-08-29
UPM-KYMMENE OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method and apparatus for controlling the catalytic oxidation of cellulose
  • Method and apparatus for controlling the catalytic oxidation of cellulose
  • Method and apparatus for controlling the catalytic oxidation of cellulose

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Embodiment Construction

[0026] Detailed description of the preferred embodiment

[0027] In the following disclosure, all percentage values ​​are by weight if not stated otherwise. Also, all numerical ranges given are inclusive of the upper and lower limits of that range, unless otherwise stated. All results shown and calculations performed, as they relate to the amount of stock, were obtained on a dry stock basis.

[0028] Principle of catalytic oxidation

[0029] The primary hydroxyl groups of cellulose are catalyzed by the oxidation of heterocyclic nitroxyl compounds (eg, 2,2,6,6-tetramethylpiperidinyl-1-oxy radical, "TEMPO"). Other heterocyclic nitroxyl compounds known to be selective in the hydroxyl oxidation of the C-6 carbon of the glucose unit of cellulose can also be used and are widely cited in the literature. Hereinafter, oxidation of cellulose refers to the oxidation of these hydroxyl groups to aldehyde and / or carboxyl groups. Preferably the hydroxyl group is oxidized to the carboxy...

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Abstract

The invention discloses a method and apparatus for controlling the catalytic oxidation of cellulose. The method for controlling the catalytic oxidation of cellulose comprises: using a heterocyclic nitroxyl compound as catalyst, oxidizing cellulose in a reaction mixture comprising liquid medium, the catalyst and hypochlorite as main oxidant, analyzing one or more oxidative chlorine species dependent on the hypochlorite concentration of the reaction mixture on line in the reaction mixture or in a gas composition which is in contact with the reaction mixture, and controlling supply of hypochlorite to the reaction mixture on the basis of the analysis.

Description

technical field [0001] The present invention relates to a method for the controlled catalytic oxidation of cellulose using heterocyclic nitroxyl compounds as catalysts. The invention also relates to a device for carrying out the method. Background technique [0002] Cellulose is a renewable natural polymer that can be converted into many chemical derivatives. Derivatization mostly occurs by chemical reaction of the hydroxyl groups in the β-D-glucopyranose units of the polymer. Through chemical derivatization, the properties of cellulose can be altered relative to the original chemical form while retaining the polymer structure. Reaction selectivity is important so that derivatives with the desired chemical structure can be obtained. [0003] Heterocyclic nitroxyl compounds are known as catalysts involved in the selective oxidation of the C-6 hydroxyl groups of cellulose molecules into aldehydes and carboxylic acids, and the corresponding oxoammonium salts are known as act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/04C08B17/06G01N27/416
CPCC08B15/04C08B17/06G01N27/4168Y02P20/582D21C9/14D21H11/16G01N1/22G01N35/08B01J14/00B01J19/0006B01J2219/00186
Inventor I·卡扬托M·诺珀宁
Owner UPM-KYMMENE OYJ