Method of producing fir chemical pulp

A technology for chemical pulp and production methods, which is applied in papermaking, textile and papermaking, and the manufacture of thin wood chips, etc., can solve the problems of reduced pulp production capacity, long cooking cycle, and high alkali consumption, and achieves improved utilization efficiency, short cooking cycle, Low alkalinity effect

Active Publication Date: 2007-10-24
YUEYANG FOREST & PAPER CO LTD
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Problems solved by technology

In "Journal of Fujian Forestry University", Volume 18, No. 2, 1998, an 8×1L rotary air bath cooker was used for sulfate cooking. The cooking conditions were: 20% alkali (Na 2 O meter), vulcanization degree 30%, liquid ratio 1:4, maximum temperature 170±2°C, heating time from 40°C to 170°C is 2.5 hours, holding time 140min, temperature rising to 120°C for 30 minutes to make fir pulp According to the technical report, the technical scheme uses 20% alkali (Na 2 O meter, 25.8% by NaOH), the cooking time is as long as 5 hours and 20 minutes, the amount of alkali used is high, and the cooking cycle is long, because the proportion of Chinese fir is smaller than that of commonly used pulping wood, under the premise of a certain volume of the digester , leading to a decrease in pulp production capacity

Method used

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  • Method of producing fir chemical pulp
  • Method of producing fir chemical pulp

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Embodiment 2

[0025] The production method of embodiment 2 is as follows:

[0026] (1) Material preparation: choose peeled fir, send it to the chipper to cut into wood chips, and the wood chips are screened by a swing screen to select qualified wood chips with a length of 12-45mm, a width of 10-50mm, and a thickness of 2-9mm, and send them to the silo or feeder. On-site storage, the pass rate of tested wood chips is 73%;

[0027] (2) Pot loading: After the cooking pot 5 has been sprayed, open the pot cover and the gate 3 of the wood chip bin 1, and the wood chips after the process (1) will be packed into the cooking pot 5 through the wood chip bin 1. In the process, add 23.5% (NaOH meter, weight ratio to absolute dry wood chips), degree of sulfidation 20%, kraft method cooking liquid with liquid ratio 1: 3.2, close feed bin gate 3 after installing, and cover the pot cover;

[0028] (3) Cooking: The material in the pot after the process (2) is directly heated from the steam inlet pipe and ...

Embodiment 3

[0031] The production procedure of embodiment 3 is as follows:

[0032] (1) Material preparation: choose peeled fir, send it to the chipper and cut it into wood chips, and the wood chips are screened by a swing screen to select qualified wood chips with a length of 12-45mm, a width of 10-50mm, and a thickness of 2-9mm, according to the dry weight ratio Mix less than 30% Chinese fir chips and more than 70% masson pine chips with the same specifications, and send them to the silo or stockyard for storage. The passing rate of the tested wood chips is 82%;

[0033] (2) Pot loading: After the cooking pot 5 has been sprayed, open the pot cover and the gate 3 of the wood chip bin 1, and the wood chips after the process (1) will be packed into the cooking pot 5 through the wood chip bin 1. In the process, add 24% (NaOH meter, weight ratio to absolute dry wood chips), degree of sulfidation 22%, and kraft method cooking liquid with a liquid ratio of 1: 2.7, close the feed bin gate 3 aft...

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Abstract

A production method of fir wood chemical pulp uses fir as raw materials and sulphate process for boiling, the alkali amount 20-24% (measured on NaOH), the sulfide degree 10-23%, liquid ratio 1:2-1:3. 2, the total cooking time is 2 hours and 50 minutes to 3 hours and 10 minutes, Kappa number of prepared pulp is between 36 to 60, it is suitable for producing high-intensity wrapping paper in original color. The present invention shortens the boiling time and improves the availability ratio of boiler, solves the technical issues of pulp amount is lowered caused by fir small specific density, small pot capacity and bin door easy to be blocked up, it can prepare chemical pulp using the fir processing residual sideboard, resolve the issue of a large number of fir sideboard have to be wasted and has advantages of saving timber resources and reducing energy consumption.

Description

Technical field: [0001] The invention relates to a production method of chemical cellulose pulp in the papermaking process, in particular to a production method of Chinese fir chemical pulp. Background technique: [0002] In the process of pulping and papermaking, there are many pulping processes for different fiber raw materials, such as kraft method, sulfite method, stone ground wood pulp method, chemical mechanical pulp method, among which the kraft method is made of Pulp has the advantages of high physical strength when making paper, mature pollutant treatment technology in the production process, and recycling of chemicals, etc., and has been widely used. The kraft method has been developed to this day, and there have been traditional production methods such as batch steaming ball or vertical pot cooking, displacement cooking, continuous cooking, etc., which have wide applicability to chemical pulping of different fiber raw materials. But for producing chemical pulp ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21B1/06D21C7/00B27L5/00D21C7/08D21C7/02
Inventor 朱杰秦瑞华梁好新凌宏才李声开
Owner YUEYANG FOREST & PAPER CO LTD
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