SU1393840A1 - Method of producing needle coke - Google Patents

Description

(21) 4006128 / 23-26

(22) 01/03/86

(46) 05/07/88. Bksh. Number 17

(71) Ufa Oil Institute

(72) V.Z. Gubaidullin, R.N.Gimaev, S.A. Akhmetov, G.A.Vedin, A.A. Dushin and R.A.Faskhutdinbv

(53) 665.777.4 (088.8)

(56) USSR author's certificate

No. 311950, class From 10 to 55/00, 1969.

(54) METHOD FOR OBTAINING A NEEDLE COKE

(57) The invention relates to a method for producing needle coke and to improve its quality. A delayed coking is subjected to a mixture of the oil distillate cracking residue and the extract of the selective purification of the oil fraction, boiling out of the C420C, in a ratio (80:50) - (20:50) wt.%. 2 tab.

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The invention relates to a method for producing needle coke and can be used in the refining industry.

The purpose of the invention is to improve the quality of coke.

Example 1. A distillate cracking residue and an extract for the selective purification of an oil fraction with a boiling point above 420 ° C, the compositions and properties of which are given in Table 1, are taken in a ratio of 90: 100 and subjected to coking in a flow-type coking unit with a capacity raw 1 l / h The capacity of the reactor is 4 l, the pressure in the reactor is 0.3 MPa, and the temperature in the reactor is maintained within 470–480 ° C. The output of coke is 30.4%, the density is 2135 kg / m, the sulfur content is 0.38%, the oxidability is 2.3%, the structure score is 5.7, the thermal expansion coefficient (MFC) is 0.45 1 / c10

Example 2: Same as Example 1. When the ratio of distillate cracking residue and extract is selective, the oil fraction is 80:20. The output of coke is 29.5%, the density is 2140 kg / m, the sulfur content is 0.40%, its oxyl content is 1.4%, the points structure is 6.5, and the CTE is 0.36.

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In other examples, the ratio of the distillate cracking residue and the extract for selective purification of oils is nflet 100: 0, 50:50, 20:80 and 0: 100, respectively.

Material balances and quality of coke are given in table. 2

As can be seen from the table. 2, - the output of coke from the extract for selective purification of the oil fraction is minimal and amounts to 14.2%; the yield of coke during the coking of the distillate cracking residue is 31.5%.

When coking mixtures containing the listed components, the coke yield is 20–30.4% and is higher than that calculated by additivity. The tabx (.2 also shows the quality indicators of calcined coke.

93840

The extracts for the selective purification of oils have chosen the boiling point above because, under the conditions of the delayed coking process (coking temperature 480-500 ° C, pressure 0.2-0.4 MPa) they are in the liquid phase and participate in the reaction x condensation and compaction, to actually coke formation.

The extracts having a boiling range below under these conditions are in the vapor phase and undergo mainly cracking reactions, 15 practically do not participate in the formation of coke and as a result do not affect the formation of its properties.

These data show that the coke obtained from the distillate cracking residue and the extract for the selective purification of the oil fraction boiling at a temperature above 420 C, taken in the ratio (80-50) :( 20-50), is superior in its qualities to coke derived from distillate cracking residue.

Thus, the proposed method allows to significantly increase the share of the needle 30 component in the resulting coke, which leads to an improvement in many of the operational characteristics of coke.

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Claims (1)

Claim method for producing needle coke, including delayed coking of an oil distillation cracking residue, characterized in that, in order to increase the quality of coke, a distillation residue is additionally introduced with an extract of selective purification of an oil fraction with a boiling point higher than 420 s ratio, wt.%: Distillation cracking residue 80-50 Extract of selective purification of an oil fraction with a boiling point of 4-20 from 20-50 Density, kg / m Coking ability, wt.% Molecular weight Sulfur content, May Ash content, wt.% Boiling start, C Boils: to zoo with Group hydrocarbon composition, wt.% paraffin naphthene high aromatic including polycyclic bicyclic monocyclic resin asphaltenes carbene and carboides 0.7 0.6 0.4 0.2 Anisometry: grain content with anisometry more than 1.5 relative units,% average anisometry. table 2 60 60 53 51