JPS5936951B2 - Carbon black manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing reinforced carbon black for use in rubber compounds and the like.

A small number of limited petroleum fractions and extracts and coal tar distillates are widely used as liquid feedstocks used in oil furnace processes to produce carbon black, meeting a wide range of demands on concentration and properties. .

Since petroleum resources containing a large amount of aromatic hydrocarbons are quite limited, there is a need to develop new resources. It is known to produce carbon black by decomposing finely crushed rubber waste in special reactors, in which gas and coke-like residues are obtained together with carbon black (a Soviet invention). personal evidence 328, 605
The carbon black obtained by this method contains considerable amounts of coke particles and ash, and has a lower oil and lower content than that of standard carbon blacks of this type. Contains different substances. When this carbon black is added to the rubber compound, the vulcanization ability is somewhat improved. In other conventional methods of producing carbon black, comminuted rubber waste is added to crude oil to obtain furnace black. ('PolymerAge', Volume 3, Issue 7, 19
July 1972; U.S. Pat. No. 3,674,433, July 4, 1972; and U.S. Pat. No. 3,700,615, 197
The disadvantages of the conventional methods described above are that the rubber waste must be ground very finely, which inevitably increases power consumption, and that the quality of the carbon black is affected by the high ash content of the rubber waste. to be influenced by

The object of the invention is to obtain reinforced carbon blacks, in particular furnace blacks, lamp blacks and thermal blacks, by pyrolysis of waste or readily available raw materials.

This objective is achieved by the following method. The process involves the cracking distillation of a mixture of the following composition, which mixture is used to process waste rubber products such as tires, rubber conveyor belts, footwear, cable insulation, and all types of manufacturing waste arising from the rubber industry. 0-100% of sulfides
0 to 70% of plastics, synthetic resins, yarn and textile waste; coal tar, extracts from selective refining of pine oil, pine oil, semi-grown pine oil, and petroleum refining; 0-5 of hydrocarbons such as residues from petrochemical synthesis
0%.

The decomposition distillation is carried out in a reactor under continuous temperature rise in the range from 250 to 950°C. The vapor and gas mixture produced by this cracking distillation is passed through a water-cooled condensation system (18°C) to separate liquid hydrocarbons and gases, while at the end of this cracking distillation process, no Only a solid coke-like residue remains. If necessary, in order to increase the rate of aromatization of the separated liquid hydrocarbons (correlation index greater than 90), the vapor and gas mixture leaving the reactor by the pyrolysis may undergo another reaction. Further heat treatment at 400 to 900°C is applied inside the vessel. A significant amount of aromatic hydrocarbons having a boiling point of 200-500 (average boiling point not higher than 390°C) is extracted from the liquid hydrocarbons obtained by the above pyrolysis by means of distillation, extraction, etc. Containing fractions and extracts are obtained.

These fractions and extracts, alone or mixed with other liquid raw materials, can be used in reinforced furnace blacks,
It is used as a raw material for producing lamp blacks and thermal blacks by a known method (ie, by incomplete combustion of raw materials). The advantages of the method of the invention are as follows.

1. As starting material readily available waste materials are used.

2. By mixing and temperature control it is possible to prepare raw materials with the desired properties, so that high quality carbon black is obtained in high yields.

3. The equipment for processing the starting materials is not complex and conventional equipment can be used.

゛4. A variety of liquid hydrocarbon sources can be used and are therefore suitable for producing carbon black.

5. Raw materials for carbon black are available at low prices.

6. Effective use of waste materials becomes possible.

The invention will be better understood by the following examples.

Example 1 Torn truck tire waste was employed as feedstock for pyrolysis.

This thermal decomposition process was continued for 4 hours and 30 minutes in the 51 reactor, and the raw material in the reactor was gradually heated to 600°C. The generated steam and gas mixture is removed from the reactor and transferred to another reactor where a further 680-700
After being heated at °C, it was passed through a water-cooled condenser to separate the condensable hydrocarbons. By means of fractional distillation, a fraction with the following characteristics was separated. i.e. density 0.993
(at 20°C); refractive index 1.5976; distillation range - initial boiling point 280°C; 50% distillation up to 362°C; sulfur content 0.
98%; correlation index 92. The above fraction was mixed with oil in a 1:1 ratio and introduced into a stirring flame to obtain furnace carbon black.

The obtained furnace black has a specific surface area of 82.4 i/g.
;Oil number (0i1number) 92m1/1
The characteristics of 009 were shown. Example 2 A mixture of truck tire waste, polystyrene waste, PyrOllz resin and coal tar pitch in a ratio of 3:1:2:2.5, respectively, was pyrolyzed according to the method of Example 1. .

The obtained liquid product was subjected to fractional distillation to separate a fraction having the following characteristics. That is, density 1.026 (at 20°C); refractive index 1.6122 (at 20°C): distillation range - initial boiling point 253°C, 50% distillation up to 371°C: sulfur content 0
．． 97%; correlation index 93. Using a mixture of the above fraction and oil at a ratio of 1:1 as a raw material, carbon black obtained by incomplete combustion using a known method has a specific surface area of 86.3 i/fl; oil number 108 mj/100.
It showed 9 characteristics. Example 3 The liquid hydrocarbon fraction obtained in Example 2 was selectively extracted using a furfural extraction method to obtain an extract as a raw material for carbon black.

This extraction method was carried out using a continuous extraction device. The furfural used for extraction was recycled and reused. The above extract has a density of 1.041 at 20°C; a refractive index of 1
．． 634: Distillation range - initial boiling point 250℃, 50% distillation 38
up to 6°C; sulfur content 1.4%; correlation index 106.
The furnace black obtained by incomplete combustion of a mixture of this extract and oil (mixing ratio 1:1) has a specific surface area of 97.2 I/9; oil number 115 m1/10.
It showed the characteristics of 09.

Claims (1)

[Claims] 1.0 to 100% of rubber vulcanizate waste; 0 to 70% of plastic, synthetic resin, and knitting yarn waste; hydrocarbon products of coal coking, hydrocarbon products of petroleum refining, and 0-50% of hydrocarbon products of petrochemical synthesis
A polymeric substance mixture consisting of and ; is thermally decomposed at a temperature of 250 to 950°C, and the volatiles obtained by this thermal decomposition are further heat-treated at a temperature of 400 to 900°C, and a product obtained by the above heat treatment is obtained. A product containing hydrocarbons as a main component and having a correlation index of 90 or more is separated by means of fractional distillation, extraction and condensation, and the separated product is used alone or mixed with other liquid raw materials to obtain a known product. A method for producing a reinforced carbon black selected from furnace black, lamp black and thermal black, characterized in that carbon black is obtained by the method of