DE1278815C2 - PROCESS FOR THE REMOVAL OF PRINTED NEWSPAPER - Google Patents

Description

3 * 4

Cardboard, in which this is added to the surrounding air with an aqueous solution, since previous dissolution of soaps or soap-like agents, obviously dampen the printing inks and harden their z. B. Fettaikoholsulfonaten, Mersolaten or alkyl removal from the paper fiber difficult,
arylsulphonates, the solvent or solvents Preferably the treatment solution will wemittelgemische such as tetralin, Methylhexalin, per- 5 niger than 6.0, such as about 4 to 6 weight percent, and chloroethylene od. ä., contain, heated to about 100 ⁰ C, preferably about 5 to 5.5 percent by weight. Apart from the solution to the problem, which is completely different from that of the preprinted paper, based on the weight of the processes involved. The treatment time until the removal of the hydrocarbon compounds with the help of organic solvents to a substantial defibration of the paper is usually between about 10 and 50 minutes in the known process, the latter generally leads between about 20 and 40 minutes,
Previously known methods not usable. Following the treatment, the decolorization of printed paper is removed as a result of fibrous material, whereupon it is expedient to use water or organic solvents to a solids content which is often dangerous for the personnel. 15 see about 0.5 and 1.5%, preferably about 1.0%>,

The object of the present invention is therefore, based on the weight of the solution, is diluted, the deficiencies of the known processes listed above. After dilution, the paper stock is removed from the drive to eliminate and in an economical way solution separated, washed and after known adequate decolorization of printed paper methods thickened. The resulting material will to achieve this in papermaking ao then, z. B. with sulfuric acid or sulfurous acid, to be able to reuse without the fact that the pH value between about 4 and 6.5 is preferably generated Papers inferior in color or firmness between about 4.5 and 5.5, acidified, deterioration appear. thick and then shaped into a ribbon. It has

The process of decolorizing printed matter showed that this acidification removed the gloss of the

Newsprint according to the invention by processing paper produced from the decolored paper stock

tion in one an adduct of an alkylphenol and k significantly increases and makes bleaching superfluous.

Ethylene oxide-containing aqueous solution at- In addition, it was found that acidification was about

higher temperature, separation of the pulp fiber from existing residual color particles precipitates, whereby

The dissolution and washing is characterized by preventing such particles from settling on the

net that the printed newsprint settle in water, that, 30 felts and rollers.

based on the weight of the paper, about 1 to 2.5 times.

weight percent of an adduct of alkylphenol and ren explanation of the invention.
Ethylene oxide of the formula

ROC ₂ H ₄ - (- OC ₂ H ₄ -) "OH example

contains, where R is an alkylphenyl radical city water with a pH of 7.9 and

and η is a number from 4 to 30, at a temperature a carbonate hardness of 119 ppm is reduced to about

heated to a temperature below the cloud point of the mixture of 54 ° C and fed to the reaction vessel,

to a slurry of less than 10 weight percent. This is for a single batch process

Put on paper and essentially set up the paper in it, although the method according to the invention

lichen is shredded and separated from the solution. dung also continuously or semi-continuously

One advantage of this method is that you cannot become one with _o 2füi> .i. The reaction vessel takes special care in the choice of the treatment - it has to use a motor-driven stirring water, as it is also a hard mechanism and is equipped with a hood, water, for example with a carbonate hardness of 45, to retain the heat. Also contains 20 to 350 ppm or higher, can use. it is a steam pipe to get through heat exchange

It is advisable to use adducts to maintain a temperature of about 54 ° C, where R is an alkylphenyl group in which the relative to the weight of the paper to be decolored, Alkyl radicals between 9 and 19 carbon atoms result in 1.6 percent by weight ethylene oxide adduct of holds, and particularly suitable is an adduct of 50 dodecylphenol added to the reaction vessel and Dodecylphenol and ethylene oxide. The used dissolved in the water. To the solution one gives The amount of adduct is then preferably between about 5 percent by weight of non-comminuted 1.5 and 2.0, preferably around 1.5 weight dry newsprint. While maintaining Percent, based on the weight of the dry at a temperature of 57 ° C, is the reaction paper. 55 container contents with defibration of the paper 35 min

The treatment temperature can be stirred between space slots. Then the pulp is in a vat temperature and cloud point of the mixture subtracted and diluted with water to vary one fiber, with a temperature range of about 43 suspensions with about 1 weight percent solids too to 60 ° C is preferred. result. Then the fiber suspension is through

In the method according to the invention, a three-stage washer and a thickener are used

Next, light up the water to the desired temperature using a mesh wire sieve of about 0.323 mm

brought, whereupon the adduct of alkylphenol expanded, thickened and washed. The festival-

and ethylene oxide and then the printed material content of the withdrawn paper pulp is about

Paper can be added. A benefit of the process 5.0 percent by weight. Now the pulp becomes

is that it is not necessary to acidify this 65 to pH 5.0 by

Shred paper before adding. Appropriate- SO ₂ -GaS initiates. Then again

wisely, the paper is also thickened in its natural state and the pulp is deformed into a band. This

dry state, d. H. with the moisture content is practically white and has a suitable composition

that is, to be processed together with fresh paper stock in papermaking.

Goodness tests of the deinked paper stock showed that the acidification resulted in additional lightening. According to the method T 452 m-58 the Technical Association of the Pulp and Paper Industry was at the after the third wash paper pulp peeled off with a pH of 6.5 has a T.A.P.P.- brightness of 56, at the After acidification, the paper wet removed had a T.A.P.P.I. brightness of 58. From this it follows found that a preferred embodiment of the present process is acidification of the pulp after washing.

Claims (3)

** sation product, based on the dry weight of the patent claims: paper to be treated, so that this process is extremely uneconomical. In addition, the 1. Process for decolorizing printed, precipitated condensation products only with difficulty and not completely separating newsprint from the paper pulp by processing in a 5.
Adduct of an alkylphenol and ethylene oxide From the publication "Third International Kon-containing aqueous solution at increased temperature for surface-active substances from 12 to temperature, separation of cellulose fibers from September 17, 1960 in Cologne / Rhein", Vol. 4, sec-solution and Waschung., Thereby marked D, pp. 113 and 114, it is known to decolorize that the printed newsprint is wetting and dispersing printed paper in water with a content of about 1 to medium, in particular non-ionic wetting agents, in 2 To use 5 percent by weight, based on the paper, presence of caustic soda at reduced cooking weight, an adduct of alkylphenol and temperature or room temperature. There is ethylene oxide of the formula but there is no reference to the invention Tj _n ρ ti (r \ rvf \ np ¹ S according to the wetting agent used, nor to the fact uu ₂ n ₄ (, uu ₂ n ₄ ) "un ^^ _{that the temperature is below} half of the turbidity where R is an alkylphenyl radical and η point is to be kept. is a number from 4 to 30, at a temperature The reference Tappi, Vol. 43 (1960), pp. 928 bis below the cloud point of the mixture to 933, US-PS 27 16058 and DT-PS 871 666 to a pulp with less than 10 percent by weight ao relate to the resin removal from pulp pulp, i.e. the Putting on the paper and removing the natural resins found in the wood, substantial fiberised and stripped from the solution with adducts of alkylphenols and ethylene oxide, separates. but with these procedures neither a decolorizing 2. The method according to claim 1, striving for waste paper in which synthetic resins, indicates that an adduct is used, dyes, printing inks and binders are removed in which R is an alkylphenyl group, in which den, nor can these references be accepted Alkyl radical between 9 and 19 carbon atoms, refer to the information that below the turbidity contains the printed dry paper in which the point is to be worked, rather the Solution within about 10 to 50 minutes in specific temperature information about the cloudiness pulp is converted, then place the mixture on 3 "dots of the compounds in question. about 0.1 to 1.5% dry matter by addition In TAPPI, Vol. 40 (1957), p. 124 A, the Vervon Water is diluted, the resulting pulp is turning before. Detergents for discoloring old laundry and thickened and mentioned in a tape without any changes to the chemical structure. door of the connections used as well as their 3. The method according to claim 1 and 2, thereby 35 concentration something is said and without that characterized in that the pulp can be found after a teaching that one below the Wash acidified to pH about 4.0 to 6.5. Cloud point must remain. Again lie the specifically specified temperatures far above the cloud points of the inventively used 40th adducts. Finally, DT-PS 10 88 336 relates to a method for the regeneration of waste paper by means of a If printed waste paper in the papermaking alkaline aqueous liquor, the water glass, a is to be reused for a long time, this previously oxygen-releasing compound, such as hydrogen tinted to remove the inks. 45 peroxide, sodium peroxide, perborate or percarbonate, With the previously known processes, one obtained there- and at least one nitrogen-free organic compound As a rule, there is no paper material of inferior quality that contains dung with a wetting and washing effect. Neither tias only for colored papers, such as wrapping paper, among the wetting agents are those according to the invention. could be used, since the printing inks were only called adducts, there is still a backward were difficult and incomplete to remove. Instruction on maintaining the temperature range animal known methods are in practice host according to the invention. »Not feasible from a business point of view, as it is in relation to the Aus of Austrian patent specification 1 91 250 Treatment materials and equipment are too expensive to continue a process for the regeneration of AIt- tind. For example, German Patent 7 40 664 describes paper known in which the paper is evacuated a process for obtaining white paper 55 state is treated with water until an im ttoff from waste paper, in which the waste paper is swollen in a substantially uniform degree of swelling of the paper aqueous medium with condensation products from pier fibers is reached, whereupon the pre-swollen up- Alkylene oxides or di- or polyglycol ethers and loosened fiber structures without tearing the fibers higher molecular weight organic compounds is handled by mechanical action. At the- delt, which should only be used below certain temperatures. Completely soluble in water, at a higher temperature calculated on the dry weight of the paper however, wetting agents such as soda are insoluble or only sparingly soluble in water. Sodium hydroxide or and the mass can then be added to soft soap at a higher temperature. Such wetting agents warmed up. In this process, in which the named but not suitable, a usable discoloration th to cause condensation products by heating the waste paper above 65. The cloud point of the mixture is precipitated. Finally, one knows from the DL patent and should include the printing inks, 6 116 a process for the preparation of bituminous However, if you need between 20 and 140% condensed, tarred and paraffinized papers or