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Method for producing Chinese red pine chemical pulp

A technology of chemical pulp and production method, applied in papermaking, textiles and papermaking, pulping with inorganic alkali, etc., can solve the problems of high energy consumption, low pulp quality, large production scale, etc., and achieve low energy consumption, Excellent slurry quality and stable kappa value

Inactive Publication Date: 2008-01-09
YUEYANG FOREST & PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The continuous production process requires a large production scale and high investment; while the traditional batch cooking has the defects of high energy consumption, relatively low and unstable slurry quality

Method used

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  • Method for producing Chinese red pine chemical pulp
  • Method for producing Chinese red pine chemical pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0026] Step 1, pot loading: 100% masson pine wood chips are put into the cooking pot 6, and the black liquor is fed into the cold black liquor tank 1 while loading the wood chips, and the pot cover valve is covered after being installed.

[0027] Step 2, primary cooking: Put the wood chips after step 1 in a sealed cooking pot, using a liquid ratio of 1:8.1 (the amount of warm cooking liquid per ton of dry wood chips is 8.1M 3 ) of the warm cooking liquor, replace the black liquor when filling the pot, and distribute to different black liquor tanks according to different temperature sections, the amount of alkali used in the warm cooking liquor is 6% of the absolute dry raw material (calculated by effective alkali and sodium oxide), The degree of sulfidation of the lye is 24%; the temperature of the warm cooking liquid is 140°C, and the black liquor at the time of filling the pot is replaced, and the black liquor b...

Embodiment 2

[0033] The production method of embodiment two is as follows:

[0034] Step 1, pot loading: 90% masson pine and 10% hardwood chips are packed into the cooking pot 6, and the black liquor is fed into the black liquor while loading the chips in the cold black liquor tank 1, and the lid valve of the pot is covered after being installed.

[0035] Step 2, primary cooking: the wood chips after step 1 are placed in a sealed cooking pot, and the liquid ratio is 1: 7.9 (the amount of warm cooking liquid per ton of dry wood chips is 7.9M 3 ) warm cooking liquid to replace the black liquor when it was loaded into the pot, and distribute it to different black liquor tanks according to different temperature sections. The degree of sulfidation of the liquid is 15%; the temperature of the warm cooking liquid is 135°C, and the black liquor in the pot is replaced, and the black liquor tank 1 below 95°C is used for the potting of the next pot and the recovery of alkali delivery; The 95°C black...

Embodiment 3

[0041] The production method of embodiment three is as follows:

[0042] Step 1, pot loading: 70% masson pine wood chips and 30% broad-leaved wood chips are packed into the cooking pot 6, and the black liquid is filled with the cold black liquor tank 1 while the black liquor is loaded and the lid valve is covered.

[0043] Step 2, primary cooking: put the wood chips after step 1 in a sealed cooking pot, and the liquid ratio is 1: 8.4 (the amount of warm cooking liquid per ton of dry wood chips is 8.4M 3 ) of the warm cooking liquid to replace the black liquor when it was loaded into the pot, and distribute it to different black liquor tanks according to different temperature sections. The amount of alkali used in the warm cooking liquid is 7% of the dry raw material (calculated by effective alkali and sodium oxide), The sulfidation degree of the liquid is 30%; the temperature of the warm cooking liquid is 145°C, and the black liquor when it is loaded into the pot is replaced, ...

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Abstract

The invention relates to Chinese red pine chemical pulp manufacturing method. It includes the following steps: filling chip and black liquor at the same time; replacing the black liquor with warm cooking liquor; replacing the hot cooking liquor with the warm one; utilizing the cooking liquor to heating up 165-172 deg.C and holding; replacing the warm cooking liquor with the filtered black liquor while H gene reach 800-1200; transmitting the slurry into blowing kettle.

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 masson pine chemical pulp. Background technique: [0002] In the kraft chemical pulping process, a variety of production processes have been developed, such as continuous cooking, vertical pot intermittent steam cooking, steaming ball direct steam cooking and other processes. [0003] Chinese Patent [Application No.] 90108267, entitled batch cooking method and method and equipment for displacing liquid from the digester, discloses a displacement cooking scheme: after cooking the cellulosic material, keep the delignified pulp While the column is substantially intact, it is quantified under pressure by means of a first volume fraction of cryogenic liquid pumped into the top of the digester pulp column in the digester and a second volume fraction of said cryogenic liquid pumped into the bottom of the digester displa...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21C7/00D21C7/10D21C7/08
Inventor 赵凌泉朱忠颖李西宝张素卫张爱军
Owner YUEYANG FOREST & PAPER CO LTD
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