CS201143B1 - Process for preparing binding carbon black - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to a process for the production of binder furnace carbon black, which is used as a binder in rubber compositions or for other purposes known per se.

Certain, clearly defined petroleum fractions and coal tar tar distillation products and distillation products are used worldwide in the form of liquid furnace feedstocks for the production of carbon black. The choice of these starting products must ensure that all the requirements for consistency and other properties of the resulting carbon black are met. For this purpose, special types of petroleum fractions with the desired hydrocarbon composition are used. Given that the resources of these highly aromatic raw materials are limited and are likely to be depleted in the near future, it is necessary to look for new raw materials suitable for the production of binder carbon black.

There is a known method of producing carbon black directly from finely ground or crushed rubber waste, which is decomposed in a special reactor, at the output of which soot, gaseous products and carbonaceous residues are obtained (see Soviet author's certificate No. 328 605). The carbon blacks obtained in this way, however, contain a considerable amount of carbonaceous particles and ash and exhibit further deviations from the desired properties of the standard type of carbon black. The use of the carbon black thus obtained in rubber compositions results in a relative deterioration in the properties of the vulcanizate obtained.

201 143

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According to another known process, the finely ground rubber waste is added to an oil charge fed to a furnace for furnace carbon black (see Polymer Age, sn. 3, no. 7, July 1972, p. 237) U.S. Patent No. 3,674,433. , U.S. Patent No. 3,700,615).

The disadvantage of this method is that it is necessary to use very finely ground rubber waste, which is associated with a high energy consumption. In addition, the quality of the resulting carbon black is largely influenced by the high ash content of the rubber particles.

It is therefore an object of the present invention to provide a process for producing binder furnace soot, lamp soot and thermal soot, starting from readily available waste materials capable of thermal decomposition treatment.

SUMMARY OF THE INVENTION The present invention provides a process for the production of binder furnace carbon black, lamp carbon black and thermal carbon black by thermally decomposing polymer-based compositions comprising waste rubber vulcanizates, optionally in the presence of up to 70% by weight of plastic, synthetic resin waste , yarns and textiles or up to 50% by weight of hydrocarbons in the form of products resulting from coal coking, petroleum refining and petrochemical eynthesis processes, where thermal decomposition is carried out at temperatures in the range of 250 to 950 ° C and optionally followed by further treatment of the volatile products obtained at The fractions and extracts, mainly containing cyclic hydrocarbons with a correlation index above 90, are separated by fracoionation, extraction and condensation and the products are fed to the carbon black production stage.

The released steam and gas mixture are passed through a water-cooled condensation system (18 ° C) in which liquid hydrocarbons and gases are removed, while only a solid carbon residue remains after decomposition.

If desired, the steam and gas mixture triggering the reactor in which thermal decomposition occurs may be subjected to further heat treatment in another reactor at a temperature of 400 to 900 ° C. This treatment is carried out to increase the degree of aromatization of the obtained liquid hydrocarbons (correlation index higher than 90).

From the liquid thermal cleavage product mixture consisting of waste polymer and other substances by distillation, extraction and the like, certain fractions and extracts containing a considerable amount of aromatic hydrocarbons having a wide boiling range of 200 to 500 ° C are obtained, the mean boiling point not higher than 390 ° C, which, alone or in combination with another feed current, serves as a liquid feed for the production of binder furnaces, lamp and thermal carbon black in a manner known per se.

The process according to the invention has the following advantages over the prior art: in the form of starting products using readily available waste materials by selecting the composition of the mixture and controlling the decomposition temperature to obtain a liquid feed for producing binder furnace carbon black of desired properties

- 3,281,143 of the desired quality} simple equipment is used and the liquid batch obtained is processable on a known carbon black production plant} utilizes new sources of liquid hydrocarbons suitable for the production of binder blacks} batch production is associated with low production costs} utilizes waste materials .

In order that the invention may be more fully understood, the following examples are given by way of illustration and are not intended to limit the scope of the invention in any way.

Example 1

A batch consisting of fully chopped worn tires is subjected to thermal decomposition. The thermal cleavage is carried out in a five-liter reactor for four and a half hours, the batch being heated to 600 ° C. The reactor contents are gradually heated to this temperature. The vapors and gas mixture containing the thermal decomposition products are removed from the reactor and then subjected to a heat treatment at 680 to 700 ° C to another reactor, followed by a water-cooled condenser to separate the condensable hydrocarbons in the final product.

Distillation range:

Fractionation with the following physical properties is separated by fractional distillation of the final product: density at 20 ° C: 0,993} refractive index: 1,5976} initial boiling point 280 ° C}% of the fraction distills at a temperature greater than 362 ° C}

0.98% by weight sulfur content: correlation index:

To produce furnace carbon black, the fraction is mixed with oil in a ratio of 1: 1 and introduced into a turbulent flame. The carbon black obtained exhibited the following properties:

specific surface: 82,4 m / g} oil number: 92 ml / 100g :,

Example 2

A mixture consisting of worn truck tires, waste polystyrene, waste resin and coal tar pitch in a weight ratio of 3: 1: 2: 2.5 was subjected to thermal decomposition according to Example 1.

The liquid thermal decomposition product of the mixture obtained by condensation of the vapors and the gaseous mixture escaping from the thermal decomposition reactor is subsequently subjected to fractionated distillation in which fractions having the following physical properties are separated for the production of carbon black:

density at 20 ° C: 1,026} refractive index: 1.6122 at 20 ° C}

The distillation range has an initial boiling point of 253 ° C % fraction distilled at a temperature higher than 371 ° C 1, sulfur content 0.97 wt% correlation index »93

The carbon black obtained from a mixture of the described fraction with oil in a weight ratio of 1 t 1 exhibits the following properties. speo-fi surface »86.3 m / g oil figures 108 ml / 100g.

Example 3

The liquid hydrocarbon fraction obtained by the procedure of Example 2 and selective furfurol extraction is used to prepare an extract to serve as a liquid feed to the furnace in which the furnace carbon black is produced. The columns and furfurol are then distilled to separate the furfurol, which is further regenerated and re-oxygenated after optional purification.

distillation distill

The extract obtained by the process described has the following physical properties! density at 20 ° C: 1 * 041) refractive index: 1,634) initial boiling point 250 ° C,% frakoe distills above 386 ° C)

1.4% by weight)

106, content hiding correlation indext content hiding

The carbon black obtained from said frakoe, mixed with oil in a 1: 1 ratio by weight, exhibits the following characteristics:

specific surface »oil numbers

97.2 m / g) 115 ml / 100 g)

Claims (1)

SUBJECT OF THE INVENTION Process for the production of binder furnace carbon black, lamp carbon black and thermal carbon black by thermal decomposition of mixtures based on polymeric materials, characterized in that waste rubber vulcanisates are used, optionally in the presence of up to 70% by weight of plastic, synthetic resin, yarn and textile waste 50% by weight of hydrocarbons in the form of products resulting from coal coking, petroleum refining processes and petro-chemical syntheses, the thermal decomposition being carried out at temperatures of from 250 to 950 ° C, optionally followed by further treatment of the volatile products obtained at 400 to 900 ° C, followed by separation of fractions and extracts, mainly containing cyclic hydrocarbons with a correlation index above 90 by fractionation, extraction and condensation, and the products are fed to the carbon black production stage.