SU1247381A1 - Method of producing carbon black - Google Patents

Description

The invention relates to the production of carbon black, namely carbon black, imparting improved reinforcing properties to rubber, and can be used in rubber and polymer production.

The purpose of the invention is to increase the strength properties of polymer compositions using carbon black.

Example. The process of producing carbon black is carried out in a reactor, the schematic diagram of which is shown in the drawing.

The reactor consists of a metal casing 1 lined with two layers of lining-heat insulating 2 and refractory 3. The reactor has a sequentially and coaxially arranged air chamber 4, a combustion chamber 5, three mixing chambers 6-8 and a reaction chamber 9.

The diameter of the mixing chamber 6 is smaller than the diameter of chamber 7, the diameter of chamber 7 is smaller than the diameter of chamber 8, and the diameter of chamber 8 is smaller than the diameter of the reaction chamber 9.

The air chamber 4 is provided with an air inlet 10. Air chambers parallel to the longitudinal axis of the reactor are mounted fuel; burner 11. T

In the lining of the mixing chambers 6–8 and in the initial section of the reaction chamber 9, pipes 12–15 are mounted, respectively, to install syphonic nozzles 16 and supply co-axially to the feedstock streams of oxygen-containing gas.

At the end of the reaction chamber 9, pipes 17 are mounted to install water nozzles. By successively installing the raw nozzles 16 in the pipes 12-15, it is possible at a constant feed rate of the combustion products of the fuel and the raw materials to change the ratio of the velocity head of the flow of raw materials and combustion products of the fuel at the point of entry of the raw materials. The ratio of velocity head can also be adjusted by changing the linear feed rate of raw materials and products of combustion of fuel.

The oxidizer-air, preheated to 400 ° C, through the pipe 10 and the air chamber 4 is fed to the burners 11 with a flow rate of 5800. The fuel-propanbutane fraction of refined gas at a rate of 125 m / h is also fed to the burners. Mixture

fuel and air are burned and the combustion chamber 5 with an excess air ratio ot 1, 66 is burned to obtain combustion products with a temperature of 1400 ° C,

which are directed through the mixing chambers 6-8 to the reaction chamber RU 9.

Consistently install syf nozzles 16 in pipes 12-15,

Pre-heated to 200-210 ° C - a mixture of anthracene oil and thermogas oil - is introduced into the combustion product flow stream in the cross section of mixing chambers 6-8 or the beginning of reaction chamber 9. ratio

50:50 with a consumption of 1350 kg / h. Raw materials are introduced into the reactor in a spray form. The disintegration of the raw material is carried out by mechanical nozzles.

In the mixture with the raw material, 1.0–15.0 mg KC1 per 1 kg of raw material is introduced into the reactor.

In the reaction chamber 9, the sprayed SFU is decomposed in the combustion products of the fuel with the formation of carbon black gas reaction products. The temperature in the reaction chamber is 1570-1590 ° C.

At the end of the reaction chamber 9, the reaction products are quenched by cooling them to 650-700 ° C by injecting water sprayed with mechanical nozzles installed in pipes 17. Reaction products cooled to 650-700 ° C are removed from the reactor,

It is cooled again with water injection to 250-300 ° C and sent to a bag filter where the carbon black is separated from the gaseous reaction products. I Required speed ratio

heads of the flow of raw materials and the flow of products of combustion of fuel are provided by installing nozzles 16, respectively, in pipes 12-15, as well as by changing the linear feed rate of the raw materials,

Do not change the flow of sf.

The relationship between velocity head and flow rate is expressed by the following formula

l L1 sk 2g

where htK is the velocity head; W is the flow rate; g - free fall acceleration.

The velocity head h characterizes the kinetic energy of the flow, referred to the unit mass of the liquid or gas.

The addition of alkali to the feedstock is provided to reduce the rate of coagulation of the particles in the early stages of formation.

In tab. 1 presents data on the properties of the proposed carbon black for various process parameters.

The method makes it possible to produce carbon black with a lower degree of intergrowth of particles in aggregates and having a higher external surface available for interaction with polymers. When this soot from the raw material in the proposed method is not reduced.

. The soot obtained by the proposed method (experiments 1-5) were tested as a reinforcing filler of styrene rubber SKMS-30 ARK in a standard formulation (GOST 15627-70). For this purpose, rubber mixtures are prepared on laboratory rollers using soot experiments, 1-5, the composition of which is as follows, parts: Rubber SKMS-30 ARK 100 Stearin2.0

Zinc oxide. 5.0

Altax2.0

Sulfur.2,0

Soot50

The mixtures were vulcanized in a steam section, after which the strength characteristics of the calcined vulcanizates were determined. .

In tab. 2 presents data on

strength indicators of vulcanizates.

35

The data show a significant improvement in the strength properties of vulcanizates using the proposed soot.

Example 2. In accordance with the experiments of this example, carbon black with a specific surface area was obtained using an electron microscope of about 100.

s

ten

5 0 5

about

five

The oxidant (air), preheated before, through the nozzle 10 and the air chamber 4 serves

to burners 11 with a flow rate of 6500-7000 мз / h.

The burners are supplied with a fuel-propane-butane fraction of refined gases with a flow rate of 150. The mixture of fuel and air is burned in the combustion chamber 5 with an excess air ratio of 1.54 to produce combustion products with temperature, which are then passed through the mixing chamber 6-8, into the reaction chamber 9.

Consistently installing the raw nozzles in Pipes 12-15 in the combustion product flow stream in the cross section of the mixing chambers 6-8 or the beginning of the reaction chamber 9, the preheated to .220-220 ° C is introduced — a mixture of anthracene oil and thermo-soyl in a ratio of 40:60 with a flow rate of 1700 kg / g. In the mixture with raw materials, potassium chloride is also added to the reactor.

Next, the process is similar to example 1.

In tab. Figures 3 and 4 show the properties of carbon black for various process parameters and, accordingly, the properties of the vulcanizates.

The data table. show that with a uniform specific surface area by an electron microscope (of equal average particle size), the soot obtained by the proposed method has a higher external surface available for. interactions with polymer molecules, which leads to higher strength properties of vulcanizates.

Indicators Vulcanizates with soot obtained from experience

Prototype I 1 2 3 45

Stress at 300% elongation, Sha. . 12.0 12.8 12.9 12.9 12.8 12.6

Tensile strength, MPa 28.5 31.4 31.8 32.2 31.9 31.6 Abrasion on SR-1 cm kWh 220 210 205 200 200 210 Relative elongation,% 480 480 485 485 475 480

Table3

Process parameters and properties of carbon black Prototype The proposed method, experience

1 2 I 3 1. „

Process Parameters Place of entry, raw materials

The velocity head of the flow of products of combustion of fuel, kg / m

The flow velocity of the raw material,

kg / m2.

The rate of products burning fuel

in. section of input syf, m / s

Input speed, m / s

The ratio of the velocity head of the flow of raw materials and the flow of products of fuel combustion

Soot yield from raw materials,%

Properties of carbon black Udelna surface, 71.8

Specific surface by electron microscope,

Blend-Blend-Blend- Start of the reaction

telna tel cameras

camera camera

6 7 89

3950 2690 1890 78 55

180 520520520

231,194 39.4 33.2

58 100100100

1: 151: 3.61: 0.151: 0.105

52.5 52,852.6 52.5

75.5 77,375.7 73.3

98.8 101.2 99.2 98.1 99.9

Process parameters and properties of carbon black

The ratio of the specific external surface and the surface of the electron microscope

Absorption of dibutyl phthalate, MP / 100 g

". Specific adsorption surface

m2 / g

pH of water suspension

The residue content on the sieve with the grid 0,14K,% 0,003

T a b l and c a 4

Indicator Vulcanizates with soot obtained from experience

Prototype 1 I

Voltage at 300% elongation.

No, ZH11.8 12.0 12.2 12.0 11.8

i

Tensile strength, MPa 24.1 26.8 27.2 26.9 24.0 Abrasion on MIR-1, h 240 225 225 230. 236 Relative elongation,% 500 520 520 515 510

Compiled by L.Romantseva i. Editor N.Kishtulinets Tekhred I.Popovich Proofreader M.Sharoshi

Order 4075/24 Circulation 644Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

. Production and printing company, Uzhgorod, Projecto st., 4

Continuation of table 3

Prototype

The proposed method, the experience

Nep

0.7420,7790,7720,734

J02106106108

81.6 79.8 80.2 81.0 7.2 7.5 7.2 7.9

0,0040,0020,0030,026

Claims (1)

1. A METHOD FOR PRODUCING SOOT, including burning fuel with an oxidizing agent with the formation of a high-temperature one in that a stream of hydrocarbon feed is introduced at a speed of 15-100 m / s. 1 1247381 2