SU887604A1 - Method of producing granulated carbon black - Google Patents

Description

sulphite liquor - can be transported in tanks at any time of the year, has a lower tendency to fermentation, as it does not contain hexose monosaccharides and is stored for a year. Concentrate BDB consists mainly of salts of ligiosulfonic acids and a mixture of mono- and iolisaccharides. The monosaccharides in this mixture Vs-V4 are part by weight and consist of zeitozoarabinose and xylose; polysaccharides belong to the rough sugar-like polysaccharides that dissolve well in water. Polysaccharides are built from 2-7 molecules of monoses. Such polysaccharides include, for example, cellobiose, cellogentaose, and others. The average molecular weight of mono polysaccharides is 500-800. The average molecular weight of the actual polysaccharides is 1000-1200. Due to the presence of polysaccharides in the SDB, its solution has a better drying effect than the slit liquor solution, which contributes to the increase in the mass strength of the carbon black granules obtained using the SDB solution as a binder during wet granulation of carbon black.

Experimentally, the optimal content of mono- and polysaccharides in the RRT was found, which is 10–12 wt. . When the content of mono - and polysaccharides less than 10 weight. hours per 100 weight. including the dry residue of the BDB, the adhesive properties of the binder deteriorate; when the content of more than 12 weight. hours per 100 weight. The dry residue of the BDN binder exhibits a tendency to ferment, since it contains hexose polysaccharides. It should be noted that all mono- and polysaccharides included in the RRM belong to the class of reducing ones (such as reducing substances). They exhibit aldehyde properties in solution and have a positive effect on soot wetting with water.

Concentrates of DBB contain up to 1.3% of insoluble matter of lignin, which is formed during sulphite cooking of wood. Therefore, 1.0-2.0 wt. including sodium alkyl bepzolsulfonate per 100 weight. h. RRT. The sodium alkyl benzene sulfonates extract the lignin and convert it into solution. This is of great importance for carrying out the process of granulating carbon black, since the presence of insoluble substances makes it difficult to meter the aqueous solution of the binder fed into the granulator. The expediency of using sodium alkyl benzene sulphonate is also due to the fact that it is a low molecular weight surfactant, improving its wetting with a soot solution, as well as an antiseptic, which prevents fermentation. In an alternative way, it was found that when the content of sodium alkylbenzene sulfonate is less than 1.0 wt. hours per 100 weight. including the dry residue of the BD does not occur complete extraction of insoluble lignin, and when its content in the amount of more than 2.0 weight. h are going down

properties sdb.

An important advantage of the proposed method is the low cost of RR concentrate (15 rubles per ton, but the price list is 05-18). CTOH.viocTb it in unprecedented dry

substance below the sulphite selling price

liquor and significantly lower cost of all

other known binders,

irimen elm granulated soot.

It was experimentally established that

To pelletize soot, use 1.0–5.0% aqueous solutions of DM concentrate containing 50% solids with the addition of 1–2 wt.% sodium alkyl benzene sulfonate.

When the content of the binder in the solution is less than 1%, it is not possible to achieve the desired mass erosion of the granule, and if the content of the binder in the solution is more than 5%, the strength of individual granules increases, which negatively affects the distribution of soot in rubber compounds.

Example 1. Concentrate SDB with a content of mono - and polysaccharides 11.0 weight. hours and sodium alkylbenzenesulfonate 1.5 weight. h

per 100 weight. including the dry residue of the concentrate is prepared by blending 50% of the concentrates of the DRU of the Kotlas PPM and desalinated c) lfopol. To do this, take 200 g of concentrate BD grade B with a content of reducing substances (mono- and polysaccharides) 12.0%, add 34 g of concentrate BAT grade A with a content of reducing substances 5.2% and 3.5 g 50% and desalted sulfonol. Then to 1 l

WATER at 25 ° C is added, respectively, 10 g, 20 g, 30 g, 40 g, 50 g of the prepared 50% solution of the RR concentrate and an aqueous solution of the binder concentration from 1.0% to 5.0% is obtained.

A laboratory granulator O 200 ml / 400 mm is charged with 1 kg of PM-50 dusty soot and 1 liter of prepared solution. Soot granulation was carried out for 3 minutes at a rotational speed of calcaceous

rotor 370 rpm at 40 ° C.

Then the granulate is discharged, BE1 dried at 150 ° C and the mass strength of the granules is determined according to ASTM D 1937-76, the strength of individual granules according to ASTM 3313-74

and the bulk density of the granules according to GOST 7885-77.

The results of the experiments are given in table. 1. Example 2 (prototype). Szlfitny lye Arkhangelsk pulp and paper mill

with a solids content of 15% dilution Table 1

with water, respectively, 7.5 to 10, 15 and 25 times to obtain solutions with a binder concentration of 2.5%, 2.0%, 1.5%, 1.0%, 0.6%.

Under the conditions of Example 1, PM-50 soot was granulated with sulphite liquor solutions of the indicated concentrations.

The quality indicators of granulated carbon black are presented in table. one.

Example 3. Under the conditions of example 1, 1% solutions of concentrates containing reducing substances (mono- and polysaccharides) and alkyl benzene sulfo are prepared by varying the ratios of concentrates for DBS grades A and B and sulfonol. 1 and 2, it can be seen that when 0 is used as a binding additive, a sulphite-yeast mash with the addition of

at extreme and average values, granulation was performed under the conditions of Example 1.

The results of the experiments are presented in table 2.

It can be seen from table 1 that the use of sulphite-yeast mash concentrate with the addition of sodium alkyl benzene sulphonate allows, in comparison with the irotype, to increase the mass strength and bulk density of soot.

The data table. 2, the extremes of sodium alkyl benzene sulphonate, as well as mono- and polysaccharides in sulphite-yeast, are justified.

Table 2 1-2 wt. % sodium alkyl benzene sulfonate with wet granulated carbon black can increase the mass strength of the granules in

Compared with the prototype by 10-12% and slightly increase the bulk density of the granulate soot.

Claims (3)

1. A method of producing granulated carbon black, comprising mixing dust H1, carbon black with an aqueous solution of an organic binder additive in a weight ratio of 0.9-1.3: 1 and the subsequent structure of wet granules, characterized in that it does not increase the mass strength of the granules and reducing the cost of the granulate, as a binding additive, a sulfite yeast mash with the addition of 1-2 wt.% sodium alkyl benzene sulfonate is used. 2. Method according to n. 1, that is, with the use of a 1-5% aqueous solution of a sulphite-yeast brew. 3. Method according to n. 1, about tl and ch and yu n; and with the fact that the sulfite draw 1 brew contains 10-12 weight. % my and polysaccharides. Sources and forms of scientific research institutes taken into account during the examination 1. US Patent L 2639225, cl. 23-314, 1953. 2. Authors certificate of the USSR but application L1 2813454 / 23-26, cl. C 09C 1/58, 1979 (prototype).