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A method for efficiently separating skin pulp and stalk core pulp

A stalk-core and high-efficiency technology, applied in the field of hemp pulp preparation, can solve the problems of hindered planting and promotion of hemp crops, difficult treatment of processing wastewater, and difficulty in the development and expansion of the hemp fiber industry. The effect of low residual lignin content

Inactive Publication Date: 2016-03-30
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of breakthrough in the processing technology for the use of hemp stalks, the planting and promotion of hemp crops has been hindered, and the high price of hemp husks has raised the threshold for its processing and utilization. At the same time, there are still many pollutants in the processing wastewater. the puzzle
If the efficient and clean production of hemp fiber cannot be achieved, it will be difficult for the industry using hemp fiber to grow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Transfer the 100×40×25 (cm) bundled marijuana stalks from the raw material storage yard to the steaming ball, fill them up in an orderly manner through the manipulator, add the pre-prepared cooking liquid, and the solid-liquid ratio 1:3, the cooking method is caustic soda-anthraquinone method, the cooking liquid includes NaOH with 21% dry weight of hemp stalks, and anthraquinone with 0.2% dry weight of hemp stalks, and the insufficient water is made up by water during preparation. digester;

[0034] (2) Turn the steaming ball idly for 40 minutes, put in steam to raise the temperature to 160°C, and then keep it warm for 120 minutes, then put the steam in the ball into the dilute black liquor tank and lye tank in the form of small deflation, when other steaming balls start to heat up It is also possible to feed in the heated steaming ball until the steam in the ball is released to the atmospheric pressure, open the steaming ball cover, and rotate the steaming ball so ...

Embodiment 2

[0040] (1) Transfer the hemp stalks in bundles of 120×50×35 (cm) from the raw material storage yard to the vertical pot, fill them up in an orderly manner through the manipulator, and add the pre-prepared cooking liquid. The cooking method is sulfuric acid Salt method, the solid-to-liquid ratio is 1:4, the degree of sulphurization of the cooking liquid is 10%, and includes 23% alkali (a mixture of NaOH and NaS) of the absolute dry mass of hemp stalks. Supplement the liquid and close the digester;

[0041] (2) After passing in steam and raising the temperature to 80°C, start the medicinal liquid circulation device and heat up to 155°C while circulating, then keep warm for 240 minutes. When the temperature drops below the boiling point of the atmosphere, open the pot cover, grab the bundled hemp stalks in the vertical pot with a manipulator, and transfer them to the chute until the hemp stalks are transferred, and the remaining black liquor in the pot is drawn to the front to dr...

Embodiment 3

[0047] (1) Transfer the flax stalks in bundles of 120×40×25 (cm) from the raw material storage yard to the steaming ball, fill them up in an orderly manner through the manipulator, and add the pre-prepared cooking liquid. The cooking method is caustic soda -Anthraquinone method, the solid-to-liquid ratio is 1:3.5, the cooking solution includes NaOH with an absolute dry mass of hemp stalks of 17%, and the addition of hydroanthraquinone with an absolute dry mass of hemp stalks of 0.5%, and the insufficient water is obtained from the pulp after washing Make up warm dilute black liquor, and seal the digester;

[0048] (2) Steam the ball idly for 15 minutes, pass in steam to raise the temperature to 150°C, and then keep it warm for 240 minutes, and then the operation to the pouring is the same as step (2) of Example 1;

[0049] (3) Step (2) The hemp stalks poured into the chute enter the extrusion zone through the wedge-shaped mouth for extrusion and spraying treatment. After cooki...

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Abstract

The invention discloses a method for efficiently separating hemp husk pulp and stalk core pulp. In the method, whole hemp stalks are put into a digester without being sliced ​​and cooked according to the cooking process described in the present invention. After cooking, the husk fibers and stalk core The fiber separation equipment crushes the hemp stalks, sprays and separates them, and washes them countercurrently in the pulp washer to obtain stalk core fibers and hemp sheath fibers with excellent quality; the invention saves the very inefficient separation of hemp sheath and stalk core beforehand , and the high-efficiency separation of the two is achieved after cooking; the obtained hemp pulp has less impurities and high cellulose purity, which can be used for both textile and papermaking, while the stalk core pulp is mainly used for papermaking; the same digester can increase the unit production capacity by one Hemp stalks do not need to be sliced, which avoids fatal operation problems such as entanglement and blockage of hemp fibers in the pulping process. The way of stalk pulping.

Description

technical field [0001] The invention relates to a method for preparing hemp pulp, in particular to a method for obtaining skin pulp and stalk core pulp by cooking non-sliced ​​whole hemp stalks and separating the skin and stalk core, and belongs to the technical field of papermaking. Background technique [0002] Hemp is an important crop. Except for the relatively short skin fibers (about 2-3 mm) of hemp such as kenaf, the average length of the skin fibers of ramie, hemp, flax, etc. is between one and twenty. mm or more. The ultra-long properties of hemp fiber have made it used for spinning cloth, rubbing rope, and weaving sacks since ancient times. Even today, the use of hemp fiber is limited to high value-added products, and it is an excellent quality natural fiber raw material. [0003] However, obtaining hemp fiber is not an easy task. Hemp fibers for textiles are obtained by stripping the hemp husks from the hemp stalks and a series of refining procedures for the he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/12D21C3/02
Inventor 陈克利黄晶晶陈海燕高欣张恒
Owner KUNMING UNIV OF SCI & TECH
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