Pulp and process for pulping

a technology of pulp and pulp pulp, applied in the field of pulp and pulping, can solve the problems of malodorous organic sulfur compounds, high energy consumption, and excessive pulp degradation, and achieve the effect of reducing cooking time and consumption of energy

Inactive Publication Date: 2010-01-14
DREAMWELL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024]Pulping is a significant and one of the most energy consuming industries in the world. Due to the climate change, continuously growing population, and thus energy consumption, there is a great demand for new, energy-efficient production technologies in all fields of industry. In pulping, elimination or minimization of malodorous sulfur compounds would be an additional asset.

Problems solved by technology

However, a portion of the cell-wall lignin is retained in the fiber, and an attempt to remove this during digestion would result in excessive degradation of the pulp.
Although the kraft process is a highly developed, adaptable, and efficient process, there are some problems and disadvantages for its use.
Additionally, there are two problems inherent in the chemistry of the process, namely low carbohydrate yield and the formation of malodorous organic sulfur compounds.
Apparently, the wooden material was softened by the rapid evaporation of water and thus, rapid rupture of the lignocellulosic material.
Since water is always present in excess volumes, said solvents are not practical in derivatization of cellulose.

Method used

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  • Pulp and process for pulping
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  • Pulp and process for pulping

Examples

Experimental program
Comparison scheme
Effect test

example 1

Treatment of Softwood in 40% Aqueous Tetrabutylammonium Hydroxide in Microwave Field—5 Minutes at 170° C.

[0081]Approximately 750 mg of softwood sticks were mixed into 4.5 ml of aqueous 40% tetrabutylammonium hydroxide solution and agitated for 5 minutes at 170° C. in a sealed reactor tube equipped with magnetic stirring bar.

[0082]The agitation resulted in dark brownish solution comprising long fiber fines. Washing with water gave both bunches of detached pale beige fibers as well as completely separate fibers.

example 2

Treatment of Softwood in 20% Aqueous Tetrabutylammonium Hydroxide in Microwave Field—5 Minutes at 170° C.

[0083]Approximately 750 mg of softwood sticks were mixed into 4.5 ml of aqueous 20% tetrabutylammonium hydroxide solution and agitated for 5 minutes at 170° C. in a sealed reactor tube equipped with magnetic stirring bar.

[0084]The agitation resulted in dark brownish solution comprising long fiber fines. Washing with water gave both bunches of detached pale beige fibers as well as completely separate fibers. The pulp composition was slightly more intact compared to that of example 1.

example 3

Treatment of Softwood in 10% Aqueous Tetrabutylammonium Hydroxide in Microwave Field—5 Minutes at 170° C.

[0085]Approximately 750 mg of softwood sticks were mixed into 4.5 ml of aqueous 10% tetrabutylammonium hydroxide solution and agitated for 5 minutes at 170° C. in a sealed reactor tube equipped with magnetic stirring bar.

[0086]The agitation resulted in dark brownish solution comprising long fiber fines. Washing with water gave both bunches of detached pale beige fibers and the pulp composition more intact compared to that of example 2.

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Abstract

The invention relates to a new pulp, which is derived from lignocellulosic material subjected to agitation in an aqueous tetra-alkylammonium salt solution under microwave irradiation. The invention relates also to a process for pulping lignocellulosic material and to a process for softening lignocellulosic material. The treated material is preferably wood, softwood or hardwood.

Description

FIELD OF THE INVENTION[0001]The present invention is directed to a new pulp, which is derived from lignocellulosic material subjected to agitation in aqueous tetra-alkylammonium salt solution under microwave irradiation. The invention is also directed to a process for pulping lignocellulosic material and to a process for softening lignocellulosic material.BACKGROUND ARTPulp[0002]Pulp is the raw material for the production of paper, paperboard, fiberboard, and similar manufactured products. In purified form, it is a source of cellulose for rayon, cellulose esters, and other cellulose derived products.[0003]Pulp is obtained from plant fiber and is, therefore, a renewable source. Fibrous plants have been used a source for writing materials, e.g., papyrus, since the earliest Babylonian and Egyptian civilizations. The origin of papermaking, which is the formation of cohesive sheet from the rebonding of separated fibers, has been attributed to Ts'ai-Lun in China in 105 AD, who used bamboo...

Claims

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Application Information

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IPC IPC(8): D21C3/00D21CD21C9/00
CPCD21C9/007D21C1/06
InventorMYLLYMAKI, VESAAKSELA, REIJO
OwnerDREAMWELL