CS261290B1 - Raw material for technical black production - Google Patents

Abstract

Raw material for the production of carbon black retort form is homogenized and filtered raw coal tar or homogenised and filtered crude mixture coal tar and aromatic oils of coke-chemical or petroleum origin.

Description

The invention relates to a raw material for the production of technical carbon black produced by the retort process.

The growing consumption of technical carbon blacks and the development of their assortment required an intensification of research activities in the area, the construction of new carbon black plants and the expansion of existing plants. However, it turns out that in the vast majority of industrialized countries, the main limiting factor for the development of the soot industry is the raw material base. Generally speaking, carbon black can be made from any carbonaceous material, but the quality requirements of the technical carbon blacks produced and the reasonable economic relations, however, greatly reduce the choice of raw materials for the production of technical carbon blacks. The carbon black produced must have parameters which fully satisfy its further industrial use. The following overview lists the main quality parameters prescribed for the basic types of technical carbon black.

The type of carbon black

Qualitative indicator GPF FEP HAF ISAP

Iodine adsorption mg I ₂ / g 30-40 45-60 80-95 110-125 Oil number ml DBF / 100g 80-95 95-110 95-115 100-120 PH 6.5-8.0 6.5-8.0 6.5-8.0 7,0-8,5 Grit content max% over 0.200 0.05 0.03 0.04 0.04 over 0.071 0.200 0.200 0.200 0.100 Bulk weight 350 320 320 320 Dust content max. » - dry granulation 15 Dec 20 May 25 - wet granulation - - 8 8 Water content max% 0.8 0.8 0.8 0.8 Abrasion max% wet granulation 7 5

Furthermore, the raw material used for industrial production of industrial carbon black must be affordable and the yield of the carbon black must be as high as possible. Numerous research papers have found that the best results in the area of carbon black quality and yield can be achieved if automatic series hydrocarbons are used to produce technical carbon blacks, preferably hydrocarbons having two or three cumulated cores (naphthalene, anthracene, phenanthrene). The suitability of the raw material for the production of carbon black is evaluated by the correlation index BMCI (Bureau of Mines correlation index), whose value is defined by ^I BMCI ^A , 20 ^{B +} fe where ^{T BMCI} correlation index value constant A = 473.7 constant B = 455.3 constant C = 48 640 = density in g / cm 2 at 20 ° C

Ts = mean boiling point in ° K

The condition of high carbon black yield is met very well for a raw material with a BMCX correlation index above 158. Oil fractions obtained directly from coal tar distillation, in particular anthracene oil II and anthracene oil III, and tar fractions resulting from anthracene isolation from anthracene oil Even after isolation of naphthalene from naphthalene oil. However, these conventional coke-chemical raw materials for the production of technical carbon black are generally inadequate, therefore, they also seek and use raw materials of petroleum origin, which are similar in nature. The prerequisite is the highest possible content of aromatic hydrocarbons with cumulated nuclei. A disadvantage is the need for a relatively complicated treatment of raw materials of this origin, such as, for example, in U.S. Pat. Nos. 2,794,710 or 2,800,394, or in Canadian Patent No. 568,145. delayed coking of pitch or pyrolysis oil from olefin production, as described in Czechoslovakian Patent No. 205,746. The disadvantage of the prior art is the lack of technically suitable and affordable raw materials for the production of technical carbon black. Moreover, at present, the sources of crude coal tar are significantly higher than the processing possibilities of crude coal tar by fractional distillation in a certain period. In such cases, tar surpluses are used in the metallurgy as a substitute method, mainly as auxiliary fuel.

These disadvantages are greatly mitigated by the use of the raw material according to the invention. By virtue of the fact that the raw material for the production of technical retorts is a homogenized and filtered crude coal tar or a homogenized and filtered mixture of crude coal tar and aromatic oils of coke-chemical or petroleum origin, it has been found that a mixture composed of 20 to 60 parts by weight of crude coal tar at a temperature of 40 to 70 ° C and 40 to 80 parts by weight of aromatic oils of coke-chemical or petroleum origin at a temperature of 80 to 140 ° C. The aromatic oils used are, in particular, anthracene oil II, anthracene oil III, phenanthrene residue after isolation of anthracene from anthracene oil I, drained oil from the isolation of naphthalene from naphthalene oil or a heavy pyrolysis oil from olefin production, most often a mixture of several components.

The raw material according to the invention extends the range of raw materials suitable for the production of technical carbon black. The use of the carbon black feedstock of the present invention results in cost savings for the production of the carbon blacks, while at the same time increasing the carbon black feedstock. It is advantageous to use crude coal tar as a feedstock for the production of technical carbon black, in particular by substituting the most expensive components of petroleum origin and, moreover, usually providing the lowest-yielding technical carbon black or substituting for coke-chemical oils, saving the processing costs associated with fractional distillation tar. Of particular importance is the use of the invention in cases where coal tar sources are higher than the possibilities of fractional distillation, since its use for the production of technical carbon black is significantly more economical than its substitute use in metallurgy.

The following examples illustrate the practical composition of the raw material of the present invention and the effect achieved by treating this raw material on soot.

Example 1

The raw material for the production of 897 t was prepared by mixing 192 t of coal tar at 52 ° C, 105 t of heavy pyrolysis oil at 131 ° C and 600 t of anthracene oil III at 109 ° C. After perfect homogenization, a raw material with the following properties was obtained:

distillation start 224 ° C middle distillation temperature 355 ° C density at 20 ° C 1.145 g / cm ³ correlation index BMCI 164.5

This feedstock was injected through a filter into retorts for the simultaneous production of HAF and ISAF type carbon blacks. A total of 223 tonnes of HAF-type carbon black and 209 tonnes of ISAF-type carbon black were produced from the stated amount of raw material, which had the following quality parameters after wet granulation:

HAF ISAF iodine adsorption - mg IU / g 88.2 114.1 oil number - ml DBF / 100 g ' 103 104 pH 7.5 7.4 water content% 0.3 0.4 grit content - over 0.200 mm% 0.024 0 0.025 0 - over 0,071 mm% 0,095 0,085 Dust content% 1.47 1.58 abrasion% 2.33 3.46 bulk density g / l 358 356

Example 2

For the production of the carbon black, 320 t of crude coal tar at 48 ° C and 280 t of anthracene oil XII at 112 ° C were mixed. 600 t of raw material with the following properties were obtained:

distillation start 222 ° C middle distillation temperature 347 ° C density at 20 ° C 1.163 7 g / cm ³ BMCI correlation index 174.6

The perfectly homogenized raw material was injected through the filter into the retort and a total of 282 t of ISAF was obtained with the following qualitative parameters:

iodine adsorption - mg I ₂ / g 115,2 oil number - ml DBF / 100 g 108 pH 7,4 water content% 0,3 content, grit - over 0,200 mm% 0,020 5

- Above 0.071 mm% 0.080 Dust content% 1.26 Abrasion% 4.72 Bulk density g / 1,362

Example 3

The carbon black feedstock was assembled as a mixture of 190 tons of crude coal tar at 44 ° C, 166 tons of anthracene oil II at 112 ° C, 240 tons of anthracene oil III at 124 ° C. After homogenization, 596 t of raw material with the following properties were obtained: distillation start 228 ° C middle distillation temperature 340 ° C density at 20 ° C 1.131 5 g / cm ³ BMCI correlation index 162.6

The raw material was injected through the filter into the retort and gradually produced 95 t GPF carbon black, 105 t HAF carbon black and 70 t FEF carbon black, which after dry granulation had the following qualitative indicators:

GPF FEF HAF iodine adsorption mg ₁₂ / g 34.8 52 88 oil number - ml DBF / 100 g 86.3 106 106.5 pH 6.77 7.1 6.6 water content% 0.4 0.2 0.3 grit content - over 0.200 mm% 0,032 0 0,022 0 0,021 9 - over 0,071 mm% 0.09 0.08 0.07 Dust content% 12 17 18 bulk density g / l 371 343 341

Example 4

For the production of ISAF carbon black raw coal tar was used as a raw material and had the following properties after homogenization at 65 ° C:

start of distillation 216 ° C middle distillation temperature 414 ° C density at 20 ° C 1,182 g / cm ^{2 3} BMCI correlation index 175,4

A total of 96 tonnes of this raw material was processed and by spraying into the retort through the filter, 46 tonnes of ISAF were obtained with the following quality parameters:

iodine adsorption - mg I ₂ / g 115.2 oil number - ml DBF / 100: g 106

PH 7.4 water content% 0.35 grit content - over 0.200 mm% 0.024 0

Above 0.071 mm% 0.075 Dust content% 1.49 Bulk density g / 1,359 Abrasion% 3.28

Claims (2)

SUBJECT OF THE INVENTION 1. Raw material for the production of technical carbon black produced by the retort process, characterized in that it consists of a homogenized and filtered coal tar or a homogenised and filtered mixture of crude coal tar and aromatic oils of coke-chemical or petroleum origin. 2. The raw material according to claim 1, comprising 20 to 60 parts by weight of crude coal tar at a temperature of 40 to 70 ° C and 40 to 80 parts by weight of aromatic oils of coke-chemical or petroleum origin at a temperature of 80 to 140 ° C.