Methods for carbonate pretreatment and pulping of cellulosic material

A cellulose pulp and carbonate technology, which is applied in the fields of cellulose raw material pulping, pulping with inorganic alkali, multi-stage pulping process, etc., can solve the problems of non-implementation and the like

Inactive Publication Date: 2009-08-19
THE RES FOUND OF STATE UNIV OF NEW YORK
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Problems solved by technology

Although the patents cited above disclose the use of sodium carbonate pretreatment at about 165 degrees Celsius, the high temperature treatment disclosed in the '241 patent (issued in 1932) has not been accepted by the pulping industry for various reasons, typically not currently available. implement

Method used

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  • Methods for carbonate pretreatment and pulping of cellulosic material
  • Methods for carbonate pretreatment and pulping of cellulosic material
  • Methods for carbonate pretreatment and pulping of cellulosic material

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Embodiment Construction

[0027] Applicants have found that by treating comminuted cellulosic fibrous material, such as wood chips, with a carbonate compound, such as substantially sulfur-free sodium carbonate, in a first pretreatment stage, and then in a second pulping stage, e.g. in the presence of anthraquinone (AQ stands for any anthraquinone) during soda pulping, - improved pulp can be produced. Improved pulp can also be produced if the pulp is acid treated before the first pretreatment stage, followed by kraft pulping in the presence of anthraquinone. For example, the pulp produced can be characterized by increased pulp yield, increased bleaching rate, higher strength, and lower off-grades, among other favorable properties.

[0028] In addition, treating the wood chips with a carbonate-containing solution prior to treating the chips with pulping chemicals can reduce the amount of pulping chemicals required for the required treatments in the pulping process. This development could have a signific...

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Abstract

A method of pretreating comminuted fibrous material with sodium carbonate and then cooking the pretreated material in the presence of anthraquinone (AQ) is provided. The resulting pulp produced has a higher yield, enhanced strength, and better bleachability compared to pulp produced by prior art methods. AQ may also be introduced to the carbonate pretreatment stage. The method may further include an acid pretreatment providing further enhanced properties to the pulp produced.

Description

technical field [0001] The present invention relates to a method for the treatment of comminuted cellulosic fibrous material, eg wood chips, comprising a carbonate pretreatment prior to cooking the cellulosic material with a cooking chemical in the presence of anthraquinone (AQ). Background technique [0002] In the field of chemical pulping, cellulosic materials such as wood chips are treated with pulping chemicals to produce pulp for the manufacture of paper and other products. It is well known in the art to use caustic soda (ie, sodium hydroxide [NaOH] as the pulping chemical) in both batch and continuous digesters, known as soda cooking. Soda cooking has many advantages, including the ability to increase recovery boiler design pressure, improve recovery boiler efficiency, and sulfur removal in the process. As an added benefit, sulfur removal in the cooking process allows the use of black liquor gasification systems. The use of black liquor gasification can lead to incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/22D21C3/26
Inventor R·弗朗西斯申楠熙
Owner THE RES FOUND OF STATE UNIV OF NEW YORK
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