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Process of producing high-yield pulp

A high-yield, pulp-based technology, applied in cellulose pulp post-processing, papermaking, paper recycling, etc., can solve the problems of expensive capital investment and energy saving

Inactive Publication Date: 2011-08-17
NOURYON CHEM INT BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of EP 494 519 A1 involves expensive capital investment and does not result in sufficient energy savings while maintaining pulp yield and pulp properties

Method used

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  • Process of producing high-yield pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Black spruce (Picea mariana) wood is used to produce thermal mechanical pulp (TMP). Before preheating (4.14 bar steam pressure, 40s residence time) and refining operation, the logs are peeled and chopped and washed. Using a three-stage refining device, the input energy is changed in the last refining section to obtain pulp with different free (refining) levels. In the first refining section, a single-disc 36" pressurized refiner (36-1CP type operating at 1800rpm) is used, and in the second and third sections, a double-disc 36" atmospheric pressure refiner (type 401, 1200rpm) is used . The energy input is about 500 kWh / bdmt in the main refiner and about 1000 kWh / bdmt in the second refining section. In most cases, three third refining stages with target energy input of 400, 800, and 1200 kWh / bdmt are performed. All tests are performed under constant conditions, which means that specific energy consumption changes and pulp and paper properties are the result of the chemi...

Embodiment 2

[0055] According to the procedure of Example 1 above, the black spruce thermal mechanical pulp (TMP) was peeled, shredded, preheated and refined.

[0056] Produce TMP reference (labeled as TMP) in the same manner as in Example 1 without adding chemicals Ref1 ).

[0057] In the same manner as described in Example 1, by adding 0.19% by weight of sulfuric acid (H 2 SO 4 ) To the refiner eye (inlet) of the main refiner produces a reference TMP produced under more acidic conditions (marked as TMP Ref2 ).

[0058] Use acidic hydrogen peroxide (H 2 O 2 ) TMP prepared by adding 0.12% by weight of Na 4 EDTA and 0.08% by weight based on the weight of extremely dry wood (FeSO 4 ×7H 2 O) It is produced by mixing, and then adding the mixture to the refiner eye of the main refiner. The hydrogen peroxide (H 2 O 2 , 1.1% by weight based on the weight of extremely dry wood) is added to the discharge pipe of the main refiner. The pH of the obtained pulp was 3.7. The pulp is below Figure 2-4 And T...

Embodiment 3

[0076] According to the procedure of Example 1 above, the black spruce thermal mechanical pulp (TMP) was peeled, shredded, preheated and refined.

[0077] Produce TMP reference (labeled as TMP) in the same manner as in Example 1 without adding chemicals Ref1 ).

[0078] In the same manner as described in Example 1, by adding 0.19% by weight (of extremely dry wood) sulfuric acid (H 2 SO 4 ) To the refiner eye (inlet) of the main refiner produces a reference TMP produced under more acidic conditions (marked as TMP Ref2 ).

[0079] Use acidic hydrogen peroxide (H 2 O 2 ) TMP prepared by adding 0.08 wt% of iron sulfate (FeSO 4 ×7H 2 O) to the refiner eye of the main refiner, and add 2.2% by weight of hydrogen peroxide (H 2 O 2 ) To the discharge pipe of the main refiner. The pH of the obtained pulp was 3.3. The pulp is below Figure 5 And Table 5-6 marked as TMP HP3Fe .

[0080] Use acidic hydrogen peroxide (H 2 O 2 ) Prepared TMP by adding 0.14% by weight of iron sulfate (FeSO 4 ×7H ...

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Abstract

The present invention relates to a process for preparing a high-yield pulp comprising a) treating a lignocellulose containing material chemically by means of an oxidising system comprising at least one non-enzymatic oxidant substantially free from ozone and chlorine dioxide and an activator at a pH from about 2 to about 6.5; and b) treating the lignocellulose containing material mechanically for a time sufficient to produce a high-yield pulp, wherein the lignocellulose containing material is chemically treated prior to and / or during any mechanical treatment stage, and wherein the lignocellulose containing material is not chemically treated at a pH from about 11.5 to about 14 between stages a) and b).

Description

[0001] The invention relates to a method for producing high-yield pulp from lignocellulose-containing materials. Background technique [0002] The improved production and effective utilization of lignocellulose products are of high importance to the pulp and paper industry and society. Using natural sources in the world to produce mechanical pulping and chemical mechanical pulp is an effective way because these production methods have high yields and low environmental impact. Mechanical pulp and chemical mechanical pulp account for about 25% of the world's total fibril production. One disadvantage of the mechanical pulp method is high energy consumption, which accounts for about 20% of the world's papermaking energy requirements. Depending on the location of the mechanical pulp mill in the world, energy alone accounts for 25-50% of the total cost of thermal mechanical pulp (TMP) production. About 80% of the energy consumption in the TMP mill is in dry-line refining (main, secon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21B1/02
CPCD21C9/163D21B1/02
Inventor K·S·M·瓦尔特E·L·E·瓦克贝里M·L·保尔森
Owner NOURYON CHEM INT BV