JPH0215668B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for reducing power consumption during defibration or beating when producing high-yield pulp or beating pulp. In recent years, high-yield pulps such as refined groundwood pulp (RGP), thermomechanical pulp (TMP), chemical ground pulp (CGP), and semi-chemical pulp (SCP) have become important as main raw materials for newsprint, magazine paper, and lower-grade printing paper. occupies a position.
RGP creates pulp by defibrating softwood chips using a disc grinder and using the grinding force of the grinding force. TMP is also under pressure (in some cases,
It is made by defibrating the chips with a discliff eyener (which involves pre-treatment of the chips with sodium sulfite or sodium hydrogen sulfite). CGP and SCP are pulps made by softening the tissue of hardwood chips with sodium sulfite or sodium hydroxide, and then turning them into fibers with discliner. These pulps are defibrated from wood chips into single fibers by the mechanical action of a disk stiffener. The power consumption for this is 200 to 300 KWH/ton when manufacturing chemical pulp, but
When producing high yield pulp, RGP1500~
1800KWH/ton, TMP2000~2200KWH/ton,
CGP1100~1200KWH/ton, SCP600~
The power consumption is extremely high at 800KWH/ton, and from the point of view of energy conservation, this power saving has become a major issue. On the other hand, chemical pulp, mainly unbleached and bleached kraft pulp, is processed mechanically using a refiner in most cases before being made into paper. Beating is an indispensable process because the fibers undergo hydration and swelling and bonding between fibers progresses during paper making, resulting in paper with excellent properties. Consumption is 200-4000KWH/ton
It extends to. Conventionally, various methods have been considered to reduce these power consumptions, such as adding direct dyes such as Congo Red and Chicago Blue 6B to the pulp and beating it (Centola; Fundamentals and Practice of Paper Manufacturing Fibers); A method of refining by adding carboxymethyl cellulose or carboxymethyl starch (Japanese Unexamined Patent Publication No. 1983-61092) is known.
However, the former method has high chemical costs and the pulp is dyed red or blue, so it has never been put to practical use and remains a laboratory interest. In addition, the latter generates bubbles when added, so it may be difficult to apply it to actual operations as it is. The present inventors conducted research with the aim of further reducing power consumption during defibration of high-yield pulp or beating of chemical pulp, and as a result, they made no changes to the equipment during the defibration or beating of chemical pulp. The present inventors have discovered a refining aid that can more effectively achieve the objective by adding a very small amount of the refining aid without adding any additives, and have accomplished the present invention. That is, the present invention uses the following refining aid having a sulfone group and an amino group in the same molecule when mechanically defibrating or beating pulp to produce high-yield pulp from wood chips. The present invention relates to a method for refining wood chips or pulp, which comprises adding a compound represented by the general formula or aminolignosulfonic acid, followed by mechanical defibration or beating. General formula H ₂ N(-X)- _o SO ₃ Y where X is CH ₂ ,

【formula】

【formula】

[Formula] represents any one of the following, and Y represents any one of H, Na, K, and NH ₄ . Further, n represents 0 to 2. The high-yield pulp of the present invention refers to pulp that needs to be mechanically defibrated during pulp production,
Examples include RGP, TMP, CGP, and SCP. In addition, in the present invention, the pulp to which a refining aid is added during beating mainly refers to chemical pulps such as kraft pulp, sulfite pulp, and soda pulp, but even high-yield pulps such as SCP can be used. If further beating is required before papermaking, it is of course included in the "pulp to which a refining aid is added during beating" in the present invention. Examples of the refining aid used in the present invention include compounds of the above general formula and aminolignosulfonic acid, but among them, sulfamic acid, taurine, sulfanilic acid, o- or m-aminobenzenesulfonic acid, and aminolignosulfonic acid are preferred. Lignosulfonic acid, naphthionic acid, delta acid (

[Formula]), alpha acid (

【formula】), H acid (

[Formula]) and their Na, K, NH ₄ salts. These refining aids can be used alone or in combination of two or more. The amount of refining aid added is 0.03 to 0.03 per bone dry weight of chips or pulp.
1%, preferably 0.05-0.5%. The location of adding the refining aid is not particularly limited as long as it can achieve the purpose of the present invention, but in RGP, it is added at the refiner inlet together with the chips, and in TMP, it is added at the preheating tube or primary refiner entrance together with the chips. , CGP and SCP, it is preferably added to the pretreatment device of the tube with chemicals or at the inlet of the refiner. For refining chemical pulp, it is desirable to add the pulp and auxiliary agents at a location where they can be uniformly mixed before entering the refiner. As described above, the present invention can greatly reduce the power consumption of the refiner by adding a small amount of refining auxiliary agent without requiring any changes to the equipment. If used, it will be possible to greatly increase the amount of pulp produced and processed. In either case, the quality of the pulp is not compromised in the slightest. Therefore, the present invention is of great importance to the pulp and paper industry, especially from the point of view of energy conservation. Example 1 600 g of coniferous wood chips were refined to 130 ml of freeness with water and descliff eyeliner at a concentration of 15%. At this time, sodium sulfamate, potassium sulfamate, and sodium sulfanilate were added as auxiliary agents at 0.3% each (based on absolute dry chip weight).
Added to the diskcliff einer inlet. For comparison, a sample without additives was also tested. For each, the refining power, pulp yield, and amount of bundled fibers of the pulp were determined, and the pulp was hand-papered to 60 g/m ² to determine the tear length and tear strength. The results are shown in Table 1.

[Table] Example 2 600 g of softwood chips were packed into a 4 autoclave, 2% sodium sulfite and auxiliary agents were added thereto, and the mixture was treated at 120°C for 10 minutes at a liquid ratio of 4. Auxiliary agents include sulfamic acid, sulfanilic acid, taurine,
Naphthionic acid was added at 0.2% each. For comparison, a sample without additives was also tested. After the pretreatment, the chips were defibrated to 100 ml of freeness using a disk-cliffing iner. The refining power at this time was determined, and the yield of the obtained pulp, amount of bundled fibers, and tearing length were determined. The results are shown in Table 2.

[Table] Example 3 700g of hardwood chips were packed into 4 autoclaves, and 10% sodium sulfite, 1% sodium carbonate, and 0.1% auxiliary agent (all relative to absolute dry chip weight) were added at a liquid ratio of 3, at 170°C, 15°C. Processed for minutes. After the pretreatment, the chips were defibrated to 300 ml of freeness using a disk-cliffing iner. As auxiliary agents, sodium sulfamate, sodium sulfanilate, sodium aminolignosulfonate, sodium δ acid, sodium hydrate,
Sodium alpha acid was used. For comparison, a similar test was conducted without adding any auxiliary agent. Table 3 shows the refining power, yield, binding fiber amount, and tearing length for each.

[Table] Example 4 The equivalent of 30g of pulp consisting of 30% NBKP and 70% LBKP was taken in absolute dry condition and 0.2% of auxiliary agent was added to make the pulp 10%.
It was beaten to a freeness of 200ml using a PFI mill. Ammonium sulfamate, taurine, sodium sulfanilate, sodium aminolignosulfonate, and sodium naphthionate were used as auxiliaries. In addition, for comparison, a test was conducted with no additives added. At this time, the rotation speed of the PFI mill, the tear length and tear strength of the obtained pulp were determined. The results are shown in Table 4.

[Table]

Claims (1)

[Claims] 1. A refining aid having a sulfone group and an amino group in the same molecule, used as a refining aid during mechanical defibration to produce high-yield pulp from wood chips or when pulp is beaten. Adding a compound represented by the following general formula or aminolignosulfonic acid,
A method for refining wood chips or pulp, which comprises subsequently mechanically defibrating or beating the wood chips or pulp. General formula H ₂ N (-X) - _o SO ₃ Y where X represents CH ₂ , [Formula] [Formula] [Formula], and Y represents either H, Na, K, or NH ₄ .
Further, n represents 0 to 2.