A kind of production process of APMP

A production process and wood chip technology, which is applied in the field of fabric bleaching, can solve the problems affecting the production efficiency of the workshop and the overall pulp supply output, and achieve the effect of solving the scaling problem of the main mill and the system, reducing consumption and avoiding loss

Active Publication Date: 2021-12-03
SHANDONG TAIYANGZHIYE +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will inevitably affect the production efficiency of the workshop and the overall pulp output
[0003] At present, there is a waste paper deinking technology that uses polyhydroxysodium polyacrylate instead of silicate, but there is no technology disclosure that polyhydroxypolyacrylate sodium is applied to APMP production

Method used

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  • A kind of production process of APMP
  • A kind of production process of APMP
  • A kind of production process of APMP

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A production process of APMP, using sodium polyhydroxyacrylate instead of sodium silicate, the raw materials are sequentially passed through the chip bin, belt conveyor, chip scrubber, chip mixing tank, chip pump, inclined dehydration screw, pre-steaming bin, 1#, 2#MSD, vertical prepreg, reaction chamber, 1#, 2# horizontal conveying screw, 1#, 2# plug feeding screw, 1# main mill, cyclone separator, PSD, cooling screw, bleaching tower, 1 #Medium Consistency Pump, 1#SCP, 1# Dilution Spiral, De-submergence Pool, 1#, 2# Low Consistency Mill, Intermediate Slurry Tank, 1#, 2#F50 Pressure Screen, Multi-Disc Thickener, 3# Medium Consistency The pump reaches the slurry tower; the waste liquid generated in the production process is dried by the evaporator, and the remaining concentrated waste liquid is sent to the alkali recovery for treatment.

[0024] Add sodium polyhydroxyacrylate to 1#MSD, 2#MSD and bleaching tower respectively, the dosage ratio is 1.5:1.5::4, the total dosag...

Embodiment 2

[0032] 1. Development of wood flour:

[0033] The chemical-mechanical slurry field takes old poplar wood, puts it in a wood powder grinder and grinds it into wood powder, and measures the dryness of the wood powder.

[0034] 2. Application experiment

[0035] 1) Take 40g of absolute dry wood powder, put it in a strong thick plastic bag, do the first dosing, add according to 40% of the total dosage, prepare the dilution water first, add caustic soda, chelating agent, penetrating agent, 1 #Add sodium silicate, 2#, 3# respectively add 4kg / t and 6kg / t sodium polyhydroxyacrylate, mix evenly and add to the plastic bag together. Adjust the slurry concentration to 28%, knead repeatedly evenly, add hydrogen peroxide, and knead repeatedly evenly.

[0036] 2) Put the kneaded above-mentioned slurries in the pre-prepared water bath, and set the heat preservation temperature at 92°C to ensure that all the slurries in the bag are immersed in the water. The reaction time after the first stage...

Embodiment 3

[0050] In the production process, the output is controlled at about 115-120admt / shift, and the raw material is 100% new poplar wood, and the whiteness standard of the pulp is 75.0-77.0%. The original process uses sodium silicate (5kg / admt in the presoaking section + 18kg / admt in the bleaching section), and the addition amount is 23kg / admt. The current addition of sodium polyhydroxyacrylate is 7kg / admt (prepreg section 3kg / admt+bleach section 4kg / admt).

[0051] 1. The consumption of hydrogen peroxide is shown in Table 3 (random data testing for workshop application)

[0052] table 3

[0053]

[0054]

[0055] It can be seen from the above table that after using sodium polyhydroxyacrylate, the amount of hydrogen peroxide has increased to a certain extent, but the whiteness of the pulp has not decreased, which shows that sodium polyhydroxyacrylate has a good role in promoting the bleaching of hydrogen peroxide .

[0056] 2. System refresh cycle

[0057] From January to...

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Abstract

The invention discloses a production process of APMP, which uses sodium polyhydroxyacrylate to replace sodium silicate in chemical mechanical pulp APMP and applies it to the bleaching process. Because sodium polyhydroxyacrylate does not contain silicon and other substances that are easy to scale, the scale problem is significantly reduced under the condition that the amount of hydrogen peroxide does not increase significantly; the cleaning cycle can be extended from about ten days to more than one month, greatly improving Improve production efficiency and effective protection of production equipment.

Description

technical field [0001] The invention relates to the technical field of fabric bleaching, in particular to a production process of APMP. Background technique [0002] APMP is the English abbreviation of Alkaline peroxide mechanical pulp, which means alkaline hydrogen peroxide mechanical pulp. The characteristic of APMP pulp production is that it can be made into fully bleached pulp without separate bleaching, through NaOH and H 2 o 2 The combination of dosage changes can also make pulp with different quality characteristics, which is suitable for the needs of different papermaking. Therefore, during the whole pulping process, pulping and bleaching are accompanied. In the process of chemical-mechanical pulp production, many metal ions will greatly interfere with bleaching and destroy the bleaching effect of hydrogen peroxide. As a bleaching aid, sodium silicate can provide a certain degree of alkalinity for the entire bleaching environment; second, it can act as a penetrat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/10D21C9/16
CPCD21C9/10D21C9/163
Inventor 孙世杰刘泽华刘纪营钟洪霞张淑侠
Owner SHANDONG TAIYANGZHIYE
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