CS220705B1 - A method for producing high conductivity carbon black - Google Patents

Abstract

The invention relates to products of gasification of petroleum and tar raw materials using a mixture of oxygen and water vapor. The invention solves the problem of preparing highly conductive carbon black, i.e. carbon black with high electrical conductivity, which has extensive application use primarily for products made of plastic and rubber with antistatic treatment and for the preparation of non-metallic conductors in electrical engineering. The essence of the invention lies in controlling the technological regime of the gasification process to form two equivalent products - producer gas and special highly conductive carbon black. By controlling the operating conditions of the regime, high quality of carbon black is achieved and a new desired product of highly conductive carbon black is obtained.

Description

The invention relates to gasification products of petroleum and tar raw materials using a mixture of oxygen and water vapor.

The invention solves the problem of preparing highly conductive carbon blacks, i.e. carbon blacks with high electrical conductivity, which have extensive application applications especially for products of plastics and rubbers with antistatic treatment and for the preparation of non-metallic conductors in electrical engineering.

The essence of the invention consists in controlling the technological mode of the gasification process to produce two equivalent products - generator gas and special highly conductive carbon black. By controlling the operating conditions of the mode, a high carbon black quality is achieved and a new desired high conductive carbon black product is obtained.

BACKGROUND OF THE INVENTION The present invention relates to a process for the production of carbon black with high electrical conductivity by the partial oxidation of petroleum and tar feedstocks with a mixture of oxygen and water vapor as an equivalent product of the gaseous components of the gasification process.

So far, the main product of the gasification process is raw generator gas, which is the raw material for the production of technical hydrogen and synthesis gases. In the treatment of petroleum feedstocks in the gasification process, atmospheric or vacuum distillation residues or pyrolysis residues of liquid hydrocarbons are usually used as feedstock - pyrolysis oil; High-boiling tar fractions are used in the gasification of tar raw materials.

A by-product of the partial oxidation of high-boiling hydrocarbon mixtures is soot, which is removed from the stream of generated gas by scrubbing with water to form an aqueous suspension - so-called soot water. Carbon black, which usually contains 8 to 15 g of carbon black in 1 liter, is a hitherto undesirable ballast product and is processed using water oil and soot pellets, which are disposed of by incineration.

It has now been found and experimentally verified that by suitable control of the working conditions of the technological process, besides the gaseous products of the gasification process, special high-conducting carbon blacks can be obtained as a new desired product. non-metallic conductors in electrical engineering.

In service tests, it has been verified that on the gasification reactors used so far, at defined temperatures in the oxidation zone and reactor pressures and at defined proportions of oxygen-vapor mixture in m _n ³ oxygen per kg water vapor, highly conductive carbon black is obtained as new desired product. surface determined by low temperature nitrogen adsorption between 900 and 1400 m ² / g, specific surface area determined by adsorption of cetyltrimethylammonium bromide between 500 and 1000 m ² / g, ash content less than 1.5% / weight, iodine value between 800 and 1500 mgj / g, dibutyl phthalate adsorption value, the so-called oil number in the range of 3 to 5 ml dibutyl phthalate / g, determined by means of a Brabender absorptometer.

The above drawback has no process for producing high conductive carbon black by partial oxidation of petroleum or tar feedstocks with a mixture of oxygen and water vapor followed by water scrubbing and isolation, for example pelletizing with hydrocarbon solvents, according to the invention. , is contacted with a mixture of oxygen and water vapor in a ratio of 1.25 to 1.50 m _n ^{3 of} oxygen per kg of water vapor at temperatures in the oxidation zone of 1380 to 1600 ° C, preferably 1400 to 1500 ° C, gasification pressure at in the range of 3.2 to 3.6 MPa and a residence time in the gasification space of 5 to 15 s, preferably 8 to 12 s, producing two equivalent products, namely generator gas and soot particles, characterized by a mean particle size agglomeration of 100 to 100 s. 200 µm, specific surface area determined by adsorption of nitrogen of at least 900 m ² / g, specific surface area determined by by adsorption of cetyltrimethylammonium dibromide of more than 500 m ² / g and an ash content of less than 1,5% by weight, which after removal from the gasification chamber is removed from the gas stream by scrubbing the treated soft water with a hardness ranging from 5 to 70 µl / l and conductivity in the range of 300 to 600 μδ / οιη, optionally with fresh demineralised water, to form an aqueous suspension of the carbon black from which the carbon black is isolated, for example by pelletizing with hydrocarbon solvents.

An advantage of the process according to the invention is that high-conductive carbon black is obtained from the waste material.

The carbon black yield, based on the gasified feedstock, is in the range of 0.5 to 2.5% by weight. The invention is illustrated by the following example.

Example 1

Operational tests of high-conducting carbon black production were carried out on the process gasification generator by controlling the technological mode of the gasification process. The gasification raw material used in the tests was the residue from atmospheric distillation of petroleum - oil and the residence time in the reactor ranged from 10.1 to 10.4 seconds. The pressure in the gasification chamber was maintained in the range from 3 to 3 bar. The results of operational tests are shown in the following table. The table also shows the normal operation of the gasification generator.

gasification temperature O2: H2O ratio specific surface specific surface ash content medium size soot yield

N2 determined by adsorption of cetylmethyl-

Claims (1)

SUBJECT A process for producing highly conductive carbon black by partial oxidation of petroleum or tar feedstocks with an oxygen-water vapor mixture followed by water scrubbing and isolation, for example pelletizing with hydrocarbon solvents, characterized in that the gasified feedstock, e.g. water vapor in a ratio of 1.25 to 1.50 m _n ³ oxygen per kg water vapor at temperatures in the oxidation zone of 1380 to 1600 ° C, preferably 1400 to 1500 ° C, a gasification pressure in the range of 3.2 to 3.6 MPa and a residence time in the gasification space of 5 to 15 s, preferably 8 to 12 s, to produce two equivalent products, i.e. generator gas and soot particles, characterized by INVENTION mean particle size aggregates in the range of 100 to 200 μιη, specific surface area determined by adsorption of nitrogen of at least 900 m ² / g, specific surface area determined by adsorption of cetyltrimethylammonium bromide higher than 500 m ² / g and an ash content of less than 1.5 percent by mass at the outlet of the gasification chamber removes from the generator gas stream by scrubbing the gas with soft water treated, characterized by a water hardness in the range of 5 to 70 µl / l and a conductivity in the range of 300 to 600 µS / cm, or fresh demineralized water the soot is isolated.