Method for treatment of fibrous semi-finished product

FIELD: fibrous materials.

SUBSTANCE: invention relates to method for production of fibrous semi-finished product with antibacterial properties, containing no heavy metals and useful in production of sanitary, domestic and hygienic paper as well as domestic articles (spoons, fogs, plates cups, etc.). Waste paper mass or mixture thereof with craft hardwood or coniferous cellulose is treated with potassium permanganate in amount of 0.1-0.5 % based on mass of dry cellulose in acidic medium using sulfur acid in amount of 3.1-18.6 % at 20-40°C until total reagent is absorbed.

EFFECT: semi-finished product of improved quality due to increased hygienic properties.

2 tbl, 25 ex

 

The invention relates to the field of pulp and can be used for aseptic processing and bleaching of fibrous semi-finished product for production of sanitary and hygienic kinds of papers, as well as products for domestic use (spoons, forks, plates, saucers, cups, trays) without the use of molecular chlorine and chlorine-containing reagents. In some cases, when paper products sanitary and domestic use must be in contact with open wounds, mucous membranes, skin, holding them to the highest standards of sterility and toxicity that are not provided by the existing technology of production of paper for sanitary purposes.

In contrast to polymeric materials, the use of biologically degradable waste paper and plant fibers makes it possible to solve the problem of disposal of products, environmental pollution, waste management, toxic dioxins, which are formed during the combustion of polymeric materials.

It is known that recently tightened requirements for cellulose for the production of tissue papers (Pulp and Paper International, 2001, №.3, p.21-24). Buyers prefer long fiber with enhanced softness and cellulose with a low content of "stuff", so increased demand for fiber you who will be about the quality, preference is given to primary fiber, and not secondary. Reduced the share of recycled fiber in the composition of tissue paper, because its use reduces the strength and softness of the paper. The addition of unbleached pulp reduces the concentration of chlorine-containing compounds remaining after bleaching and heavy metal ions, if the paper used paper after printing (newspaper, magazine, book).

Known methods of bleaching fibrous semi-finished product using potassium permanganate (Igt Pulp Bleach Conf., Vancouver is., June 15, 1994: Pollsters. - Monreal, 1994, - S. 141-145. - Kojim Transformer-Coupled Amplifier. Cjorine free bleaching og KR wich permanganatea. Method of bleaching cellulose / Fedorov AI, Smolev L.L., V.A. Demin, Kulkova E.V.; RU patent No. 2123261, class D 21 9/16).

The goal of this research is to develop a method of producing fibrous semi-finished product with antiseptic properties when handling acidic potassium permanganate solution as wastepaper pulp and composite material containing unbleached softwood and hardwood pulp. This reagent is of interest for high-speed processes without heating in an acidic medium, when the oxidizing properties are most pronounced. The choice of potassium permanganate for processing fibrous material due to the antimicrobial property, which is very important for obtaining the products is Unicorno domestic use.

The proposed method differs from all known that processing (flow rate of 0.1 to 0.5%) is conducted with a solution of potassium permanganate in acidic medium at a flow rate of sulfuric acid and 3.1-18.6% to total absorption of potassium permanganate at a temperature of 20-40°when processing of wastepaper pulp, composite material, containing softwood and hardwood pulp.

When the consumption of potassium permanganate 0.1 to 0.4% by weight of absolutely dry pulp during processing of wastepaper pulp) white fibrous semi-finished product reaches 70,8-74,2%, whereas for the composite material (at a flow rate of potassium permanganate 0.1 to 0.5% by weight of absolutely dry pulp) white reaches 53,2 was 59.9%.

The technical result, which is in causal connection with the essential features of the invention is to obtain a fibrous semi-finished product based on waste paper, compositions containing unbleached softwood and hardwood pulp, with antiseptic properties and do not contain heavy metal ions.

The essential features of the invention: method of bleaching pulp, comprising the treatment of pulp with a mass concentration of 5.0% solution of potassium permanganate in acidic medium (pH of 1.9 and 3.3), maintaining the pulp slurry at 20-40°C for 30-40 minutes (until complete absorption of potassium permanganate) consumption of potassium permanganate 0.1 to 0.5% and is asgodom sulfuric acid of 6.2 to 18.6%, the separation from the solution and washing (table 1).

Total bacterial count, coliform bacteria, spores of sulphite reducing clostridia, coliphages in the samples after permanganate treatment is not detected table 2.

Example 1

Paper weight white 69,3%, viscosity of 22.4 SDR subjected permanganate treatment, including treatment of waste with a concentration of mass of a 5% solution of potassium permanganate in acidic medium (pH 2.0) with a flow rate of KMnO40.4% in the presence of sulfuric acid (12.4 per cent), while maintaining the pulp slurry at 40°C for 30 minutes. Then the fibrous semi-finished product is washed and dried.

White pulp 74,2%, the viscosity of 16.6 SDR output 99,6%.

Example 2

Waste mass is treated as in example 1 at 30°C. Other conditions similar to example 1.

The white pulp is 73.5%, viscosity 16,8 SDR output 99,6%.

Example 3

Waste mass is treated as in example 1 at a flow rate H2SO418.6% and a temperature of 20°C. Other conditions similar to example 1.

White pulp 72,2%, the viscosity of 16.7 SDR output 99,6%.

Example 4

Waste mass is treated as in example 1 at a flow rate of H2SO4of 6.2% and a temperature of 20°C. Other conditions similar to example 1.

White pulp 71,0%, the viscosity of 20.0 SDR, the yield of 99.7%.

Example 5

Recycled mass process according to example 3 with RA the course of H 2SO4of 9.3%KMnO40,3%. Other conditions analogous to example 3.

The white pulp of 72.3%, viscosity 19,0 SDR, the yield of 99.7%.

Example 6

Recycled mass process according to example 3 at a flow rate H2SO46,2%, KMnO40,2%. Other conditions analogous to example 3.

White pulp 71,2%, the viscosity of 19.2 SDR, the yield of 99.7%.

Example 7

Recycled mass process according to example 3 at a flow rate H2SO43,1%, KMnO4of 0.1%. Other conditions analogous to example 3.

The white pulp of 70.8%, the viscosity of 19.4 SDR, the yield of 99.7%.

Example 8

Composite material containing recycled mass (70%) and unbleached softwood pulp (30%) with initial whiteness of 45.3% and a viscosity 39,6 SDR is treated with a solution of potassium permanganate in acidic medium (pH 2,35), the concentration of the suspension to 5% with the consumption of potassium permanganate 0.1% of absolutely dry mass of the pulp, the consumption of sulfuric acid of 3.1%, a temperature of 20°C. Bleached mass is separated and washed.

The white pulp of 53.2%, viscosity 38,9 SDR output 99,8%.

Example 9

Composite material is treated according to example 8 at a flow rate of H2SO46,2%, KMnO40,2%. Other conditions similar to example 8.

The white pulp of 55.6%, a viscosity of 38.3 SDR output 99,8%.

Example 10

Composite material is treated according to example 8 at a flow rate of H2SO4of 9.3%KMnO40,3%. Other conditions anal is Hecny example 8.

The white pulp of 57.8%, the viscosity of 37.8 SDR output 99,8%.

Example 11

Composite material is treated according to example 8 at a flow rate of H2SO412,4%, KMnO40,4%. Other conditions similar to example 8.

White pulp 58,5%, the viscosity of 37.3 SDR output 99,8%.

Example 12

Composite material is treated according to example 8 at a flow rate of H2SO415,5%, KMnO40,5%. Other conditions similar to example 8.

The white pulp of 58.8%, viscosity 36,8 SDR, the yield of 99.7%.

Example 13

Composite material is treated according to example 8 at a flow rate H2SO46,2%, KMnO40,4%. Other conditions similar to example 8.

The white pulp is 56.4%, viscosity 36,3 SDR, the yield of 99.7%.

Example 14

Composite material is treated according to example 8 at a flow rate of H2SO418,6%, KMnO40,4%. Other conditions similar to example 8. The white pulp of 59.5%, viscosity 37,0 SDR, the yield of 99.7%.

Example 15

Composite material is treated according to example 8 at a flow rate of H2SO412,4%, KMnO40,4%, temperature 30°C. Other conditions analogous to example 8. White pulp 59,2%, the viscosity of 36.5 SDR output 99,8%.

Example 16

Composite material is treated according to example 8 at a flow rate H2SO412,4%, KMnO40,4%, temperature 40°C. Other conditions analogous to example 8.

The white pulp was 59.9%, viscosity 29,6 SDR, the output of 9.8%.

Example 17

Composite material containing recycled mass (70%) and unbleached hardwood pulp (30%) with the original white 49.9% and a viscosity of 28.4 SDR, is treated with a solution of potassium permanganate in acidic medium (pH 2,4), the concentration of the suspension to 5% with the consumption of potassium permanganate 0.1% of absolutely dry mass of the pulp, the consumption of sulfuric acid of 3.1%, a temperature of 20°C. Bleached mass is separated and washed.

The white pulp was 59.9%, viscosity 24,4 SDR, the yield of 99.7%.

Example 18

Composite material is treated according to example 17 at a flow rate of H2SO46,2%, KMnO40,2%. Other conditions analogous to example 17.

The white pulp was 62.1%, viscosity 24,2 SDR, the yield of 99.7%.

Example 19

Composite material is treated according to example 17 at a flow rate of H2SO4of 9.3%KMnO40,3%. Other conditions analogous to example 17.

White pulp 63,8%, viscosity 24,3 SDR, the yield of 99.7%.

Example 20

Composite material is treated according to example 17 at a flow rate H2SO412,4%, KMnO40,4%. Other conditions analogous to example 17.

White pulp 64.1%, and the viscosity 24,0 SDR, the yield of 99.7%.

Example 21

Composite material is treated according to example 17 at a flow rate of H2SO415,5%, KMnO40,5%. Other conditions analogous to example 17.

White pulp 64,3%, the viscosity of 23.8 SDR output 99,6%.

Example 22

Composition career the first material is treated according to example 17 at a flow rate H 2SO46,2%, KMnO40,4%. Other conditions analogous to example 17.

The white pulp of 62.8%, viscosity 26,2 SDR, the yield of 99.7%.

Example 23

Composite material is treated according to example 17 at a flow rate of H2SO418,6%, KMnO40,4%. Other conditions analogous to example 17.

White pulp 65,6%, the viscosity of 23.5 SDR, the yield of 99.7%.

Example 24

Composite material is treated according to example 17 at a flow rate of H2SO412,4%, KMnO40,4%, temperature 30°C. Other conditions analogous to example 17. The white pulp of 66.7%, a viscosity of 23.9 SDR, the yield of 99.7%.

Example 25

Composite material is treated according to example 17 at a flow rate H2SO412,4%, KMnO40,4%, temperature 40°C. Other conditions analogous to example 17. The white pulp of 67.1%, the viscosity of 23.5 SDR, the yield of 99.7%.

Total bacterial count, coliform bacteria, spores of sulphite reducing clostridia, coliphages in the samples after permanganate treatment is not found.

3,15
Table 1

The METHOD of PROCESSING FIBROUS SEMI-finished product

(Cm=5%, the processing time 30 min)
No.Consumption KMnO4,%The consumption of H2SO4,%Temperature, °Performance is aloknath p/f PHOutput %
White,%Viscosity, centipoise
Composition 1: paper weight Original white 69.3%of the initial viscosity of 22.4 SDR
1.0,412,44074,216,62.099,6
2.0,412,43073,516,82,099,6
3.0,418,62072,216,71,999,6
4.0,46,22071,020,099,7
5.0,39,32072,319,02,099,7
6.0,26,22071,219,22,299,7
7.0,13,12070,819,42,2599,7
Song 2: (paper weight 70% + coniferous sulphate pulp 30%) of the original white 45,3%; initial viscosity 39,6 SDR
8.0,13,12053,238,92,3599,8
9.0,26,22055,6to 38.3Ȋ 99,8
10.0,39,32057,8of 37.899,8
11.0,412,42058,537,399,8
12.0,515,52058,836,899,7
13.0,46,220of 56.436,33,399,7
14.0,418,62059,537,099,7
15.0,412,43 59,233,599,8
160,412,44059,929,699,8
Composition 3: (paper weight 70% + of hardwood Kraft pulp 30%) of the original white 49.9%of the initial viscosity of 28.4 SDR
17.0,13,12059,924,42,499,7
18.0,26,22062,124,299,7
19.0,39,32063,824,399,7
20.0,412,42064,124,0 99,7
21.0,515,52064,323,899,6
22.0,46,22062,826,23,399,7
23.0,418,62065,623,599,7
24.0,412,43066,723,999,7
25.0,412,44067,123,599,7
Note: the maximum value of COD of the leachate 264 mg/l
Table 2

RESULTS of MICROBIAL ANALYSIS
The retention time sample Total bacterial count
Ed. dimensionMonthcolony-forming units / g
Composition 1 (Ref.)2,59,2·103
Composition 11,00,0
Composition 2 (Ref.)1,02,3·103
Composition 21,00,0
Composition 3 (Ref.)2,58,3·103
Composition 31,00,0
Note: flow KMnO40,1%.

The method of obtaining fibrous semi-finished product with antiseptic properties that do not contain heavy metal ions, including processing of wastepaper pulp, composite material, containing unbleached hardwood and softwood pulp, potassium permanganate at a flow rate of 0.1-0.5% by weight of absolutely dry pulp in an acidic medium at a flow rate of sulfuric acid and 3.1-18.6% and so is the temperature value 20-40° With up to full absorption of the reagent.



 

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