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A method for rapid evaluation of willow kraft pulping process

A sulfate method and willow technology, applied in the field of pulping and papermaking, can solve the problems such as inability to adjust the pulping process in a timely and effective manner, unqualified paper, and long detection period, and achieve a suitable promotion, strong practicability, simple and efficient method. Effect

Active Publication Date: 2016-02-17
HAIMEN CANGYUN MACHINERY CO LTD
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Problems solved by technology

[0006] However, the current evaluation of the quality of the pulping process is mainly based on the physical properties of the paper that is finally made. In the process of actual process exploration, the pulp after cooking must first balance the moisture for 24 hours, and then paper is made, and the paper obtained is balanced. The physical performance indicators can only be tested after 24 hours of moisture, and the whole process takes more than 3 days
In the process of large-scale single factor and orthogonal experiments, the entire detection period is too long, and the pulping process cannot be adjusted in a timely and effective manner, resulting in continuous unqualified problems in the produced paper, causing huge economic losses to the enterprise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Evaluation of kraft cooking process of willow willow

[0027] 1. Preparation of Willow Chips

[0028] Preparation steps:

[0029] (1) Washing: The willow wood is first washed with tap water several times to remove a small amount of white powder and dirt attached to the surface of the willow wood, so as to prevent the metal and other components on the surface from causing adverse effects on the subsequent pulping and bleaching process;

[0030] (2) Pressing: use an ax to crack the willow wood into strips with a width of about 4 to 5 cm, and then press the bamboo strips through a press to remove the air in the cell cavity and part of the bamboo filtrate. After being pressed, the willow wood forms radial stripes on the surface, which is easy to penetrate the cooking liquid evenly during the cooking process, and speeds up the reaction rate of the willow wood and the cooking liquid.

[0031] (3) Air-drying: Expose the above-mentioned willow wood strips to the sun...

Embodiment 2

[0050] Embodiment 2 Yunnan willow sulfate cooking process evaluation

[0051] 1. Preparation of Willow Chips

[0052] Preparation steps:

[0053] (1) Washing: The willow wood is first washed with tap water several times to remove a small amount of white powder and dirt attached to the surface of the willow wood, so as to prevent the metal and other components on the surface from causing adverse effects on the subsequent pulping and bleaching process;

[0054] (2) Pressing: use an ax to crack the willow wood into strips with a width of about 4 to 5 cm, and then press the bamboo strips through a press to remove the air in the cell cavity and part of the bamboo filtrate. After being pressed, the willow wood forms radial stripes on the surface, which is easy to penetrate the cooking liquid evenly during the cooking process, and speeds up the reaction rate of the willow wood and the cooking liquid.

[0055] (3) Air-drying: Expose the above-mentioned willow wood strips to the sun ...

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Abstract

The invention provides a method for quickly evaluating the quality of a willow sulfate pulping technology. The method comprises the following steps: (a) measuring the lignin content X (%) of a willow raw material; (b) stewing by a sulfate method to prepare willow pulp, wherein the alkali amount Y (%) is metered by NaOH; (c) measuring the alkali residue content A (%) of stewing waste liquid and the kappa value K of the pulp; (d) calculating the quality of the willow sulfate pulping technology according to the following formula, if K is smaller than or equal to Z1=X*35.7+Y*66.4 and A is smaller than or equal to Z2=X*0.29+Y*0.14, judging that the technology is qualified, otherwise, judging that the technology is disqualified. The method is simple, high in efficiency, high in practicability and suitable for being popularized, and a novel method is provided for quickly adjusting a willow sulfate pulp stewing technology.

Description

technical field [0001] The invention belongs to the field of pulping and papermaking, and relates to a method for rapidly evaluating willow kraft pulping technology. Background technique [0002] Papermaking industrial wastewater is one of the sources of industrial pollution, accounting for about 10% of the total industrial wastewater in my country. Pulp and paper industry wastewater mainly contains high-concentration organic wastewater, and also contains lignin, sulfide, chloride and other pollutants. The biggest feature of papermaking wastewater is its large volume of wastewater and high concentration of COD. However, with the strengthening of environmental protection in the papermaking industry, the pollution of papermaking wastewater has been reduced year by year. In 2010, the total amount of COD produced in papermaking wastewater was about 952,000 tons. ; The pollution discharged by different types of papermaking enterprises varies greatly. The concentration of COD in ...

Claims

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Application Information

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IPC IPC(8): G01N33/00
Inventor 周栋
Owner HAIMEN CANGYUN MACHINERY CO LTD
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