DE2138009B2 - Process for soot extraction - Google Patents

Description

The invention relates to a method for extracting soot, which is used in tire, rubber and paint and paint industry can be applied.

It is a process for extracting soot from one consisting of coke oven gas and coal tar oil vapors Mixture known, which is burned in the slot burner diffusion flame. This is where the produced soot partially down on a separation surface, from which it is subsequently removed, the but the other part is carried away by the gaseous reaction products and separated in special filters (see DE-PS 8 41 316).

The disadvantages of the known process are as follows: low quality of the soot obtained, its low specific surface and poor homogeneity.

But there is also another method known for the production of gas duct soot of higher quality. However, this method is laborious and ineffective.

The invention aims to eliminate the disadvantages mentioned.

In accordance with the goal, the task was set to perfect the process for soot extraction, in order to increase the quality of the carbon black as well as the performance of the plants for its production.

The subject matter of the invention is evident from the preceding claim.

F i g. 1 explains the known process for soot extraction, whereby one anthracene black by incomplete Combustion in slot burners 1 of a mixture of coke oven gas and an anthracene fraction is obtained. The soot obtained in the flame settles on the rotating cooling surface 2 - usually one Cylinder surface - from which the soot is then removed with a special device.

So that the soot-forming flame 3 covers the largest possible area of the precipitation surface, and the greatest possible amount of carbon dioxide is deposited thereon, the slots of the burners 4 are under one Angle of 45 ° to the rotating cylindrical precipitation surface arranged (Fig. 2).

The task now was therefore to produce a carbon black of better quality, with the solution to this task two factors played a role, and once, if possible, the device previously used can be used and on the other hand a process can be developed that allows carbon black with

20th

25th

jo

35

50

55

b5 to establish various predetermined properties.

This problem was solved by changing the composition of the fuel gas once and also the angle of the burner slots in relation to the surface area of the rotating cylinder.

To reduce the oil factor or the degree of structuring of the soot obtained is proposed according to the invention, the slot of the burner in one To arrange an angle of 90 ° to the Tronimel surface axis 6 (Fig. 3). In this case the Soot precipitates a maximum time in the high temperature zone and becomes active the gasification subjected, which leads to an increase in its adsorption surface.

In order to obtain carbon black with practically undeveloped adsorption surface, it is proposed that the slots to arrange the burner at an angle of 90 ° to the drum surface axis 7, as shown in FIG. 4th shows. In this case, the soot on the drum surface is in the high temperature zone for a minimum time and is practically not subjected to gasification at all.

From what has been said above, it can be seen that for the production of soot, which is analogous to gas duct soot and differs from the usual anthracene black with a lower oil factor and a more developed adsorption surface differs according to the invention adding up to 50% natural gas to the coke oven gas and up to 50% weakly flavored petroleum distillates of the anthracene fraction and then also the burner slots in must set an angle of 90 ° to the drum surface axis 6.

For the production of carbon black, which is analogous to active furnace black and differs from the well-known anthracene black differs by an incompletely formed adsorption surface, one must after the invention Move only the slots of the burners at 90 degrees to the drum surface axis 7 and exclude the addition of natural gas and weakly flavored petroleum distillates.

F i g. 5 shows the side view from which the position of the burner slot device in relation to the drum surface axes 6.7 clearly shows.

F i g. 6 shows the top view.

For the sake of completeness, FIG. 7 which shows the front view of the device.

In detail, the F i g. 5 to 7 the burner slots 1, which are arranged in a gas collector 2, a pipe, and that below the rotating drum surface 3. The direction of the slots of the burners 1 in the line CD of FIG. 6, the top view, changes in various ways. They are either parallel to the drum axis or perpendicular to it, ie they both form an angle of 90 ° with the respective axis of the drum surface, depending on the type of carbon black to be obtained. In connection with this, as also indicated in the description, the composition of the combustion mixture that is supplied for incomplete combustion changes.

In practice, the method according to the invention is carried out in the following manner. One initiates Mixture of coke oven or natural gas through a gasifier, in which it is mixed with coal tar oil vapors and weakly flavored petroleum distillates is saturated. The working mixture obtained in this way is through a heated pipeline is fed to the slot burners, in which the mixture is discharged into the

Diffusion flame burns. To obtain a high quality soot that can replace the gas duct soot, the size of the angle between the torch slot direction and the drum surface axis is 70 °. To obtain a high quality carbon black that can replace an active furnace carbon black, the size of the Angle between the burner slot direction and the drum surface axis 6 90 °.

The invention makes it possible to improve the quality of the obtained carbon black and to increase the Maintain the performance of the systems.

10 To illustrate the invention the following examples are set forth.

Example I.

^{20% by volume and} / or natural gas are added to 80% by volume of coke oven gas. This mixture is then enriched in the gasifier by vapors from the anthracene fraction and the petroleum coke distillate. The composition of the components is given in Table 1.

Table 1
Components composition

Components composition

raw material

Coke oven gas natural gas

Anthracene fraction

Coke distillate

Methane, vol% 25.0 98.3 Ethane, Vol.-0 / o 0.3 Propane,% by volume 0.12 Butane, vol .-% 2.0 0.15 Pentane,% by volume Hexane,% by volume Hydrogen, vol .-% 58.0 Carbon monoxide,% by volume 7.0 Carbon dioxide,% by volume 3.0 0.1 Nitrogen, vol-0 / o 4.0 1.03 Hydrogen sulfide,% by volume U

Chemical group composition,% (chromatography)
Paraffinic hydrocarbons
Naphthenic hydrocarbons
Aromatic hydrocarbons

monocyclic

dicyclic

tricyclic

heterocyclic
Phenols, pyridines, resinous substances

Element composition,%
carbon
hydrogen
sulfur
nitrogen
oxygen

25.0 13.3 6.4 13.2 23.8 65.8 25.4 5.0 16.0 5.7 91.2 5.58 0.94 1.30 0.98

The resulting working mixture with a temperature of 320 ° C is passed through a collecting line Soot separating devices, each containing 32 slot burners, fed. The size of the angle between the direction of the burner slot and the axis of the surface of the drum is 7 90 °. The distance between the slots and the drum surface is kept equal to 70 mm. on a 1 mm thick layer of soot is formed on the surface by not placing a knife close to it

Table 2

maintain. The speed of the surface is assumed to be 0.5 rpm.

The total consumption of the mixture of coke oven and natural gas is 240 nmVhour, the consumption of anthracene fraction is 0.8 kg per 1 nm ^{3 of} gas, that of the coke distillate is 0.20 kg per 1 nm ^{3 of} gas. The physicochemical data are given in Table 2.

55

Physico-chemical data of the soot **)

According to the well-known law, according to the
invention

Gas duct soot

Specific geometric 82-86 95 92-98 Surface area, m ² / g Specific adsorption 90-95 140 130-140 surface area, m ² / g

21 5 continuation 38 009 6th According to the Gas duct Physico-chemical data of the soot **) invention soot 0.83 ·) 0.82-0.88 Oil factor, mm / g According to the be 3.8 3.5-4.5 pH knew procedures 0.00 0.00 Optical density of the soot 0.90-0.95 Gasoline oxidant 4.3-5.5 5.1 - Machine output, kg / hour 0.3 3.8

*) The oil factor is higher due to a higher consumption of anhracene fraction. »*) GOST 7885-63.

From Table 2 it can be seen that the crfindungsgemaß the soot obtained corresponds to its properties according to the high quality gas duct soot; in comparison but with the known method, the invention increases the performance of the production process and achieved an improvement in the quality of the carbon black.

Example 2

The coke oven gas is enriched in the gasifier by anthia / enfraktionsdämpfc. The resulting mixture with a temperature of 320 ⁰ C is through

Table 3

A collecting line for soot separating devices, each containing 32 slot burners, is supplied. The angle between Burner slot direction and drum surface axis 6 is equal to 90 °. The distance between slot and Surface is kept equal to 40 mm. There is no layer of soot on the drum surface. The drum speed is 2 rpm.

The consumption of coke oven gas is 240 nm ^J / hour, that of the anthracene fraction is 1 kg per 1 mn ^{1 of} gas. The data on the physicochemical properties are given in Table 3.

Physico-chemical data of the soot **) According to the be According to the More active knew procedures invention Furnace soot Specific geometric 82-86 99 95-105 Surface area, m ² / g Specific adsorption 90-95 101 95-105 surface, IT) ² / g Oil factor, mm / g 0.90-0.95 0.98 0.95-1.05 PH 4.3-5.5 7.2 7-9 Optical density of the soot 0.3 0.00 0.00 Gasoline oxidant Machine output, kg / hour 3.8 5.3 -

") GOST 7885-63.

From table 3 it can be seen that the angle between the burner flap and the drum

If carbon black has to be extracted, its properties according to the -Ti surface axis mean a high quality carbon black

corresponds to active furnace soot. It is thus proven that one can win and achieve a great deal of production

on one and the same equipment depending on the process.

For this purpose 2 putty drawings

Claims (1)

Claim: Process for extracting soot from a mixture of coke oven gas and coal tar oil vapors <; by burning them in the flame of diffusion slit burners and precipitating the Soot on a rotating drum, thereby characterized that the combustion is a mixture of coke oven gas, the 0 to 50 vol .-% Natural gas and coal tar oil vapors containing 0 to 50% weakly flavored petroleum distillates, is fed, the angle between the torch slot direction and the drum surface axis each is 90 °.