SU433198A1 - METHOD OF PREPARATION OF SULFUR FEED | FOR COXIATIONI - Google Patents

Description

one

The invention relates to the refining industry and can be used in refineries that process sour crude oil.

Coking processes are known in which the predominant types of feedstock are petroleum residues: tar, cracking residues of diasphalting bitumen. As a rule, during the processing of sulfur residues, not the sulfur content in coke exceeds that of raw materials by about 1.2-1.7 times. For example tar Tuymazinskoy Devonian oil with a sulfur content of 2.4% gives coke with a sulfur content of 3.6%.

Methods of preparing sulfur raw materials for coking are not described in the literature.

The proposed new method of preparing raw materials for coke ovens is based on the fact that sulfur compounds contained in the heavy aromatic hydrocarbon fraction} are the least thermally stable,

despite the fact that the concentration of sulfur in this fraction is most significant. Using this fact reduces the sulfur content in coking products.

In order to reduce the sulfur content, the light and medium aromatic hydrocarbons (n 1.560O-1.590O) are removed from the extract by distillation or adsorption and the concentrate of heavy aromatic hydrocarbons is directed to coking.

If the feedstock is tar and there is oil production at the plant: in, then the resulting extract is a waste product.

Preliminary removal of the asphalt, seeded portion of the original residue serves to improve the structure of the coke, since it is known that coking asphaltenes produces porous, spongy coke. Since the concentration of heavy aromatics. most significant in residues of secondary origin, coking of these types of raw materials is preferable in terms of reducing sulfur in the resulting coke.

x) Hereinafter, under aromatic aroma. skimk hydrocarbons are understood to be isolated on silica gel by standard

using a standard technique with ® more than 1.59

J.

Jd

In tab. 1 shows the coke yield and sulfur content in the coke from the components of the deasphaltic acid cracking residue.

Table

Confirmation of the data obtained in the table. 1 is also the effect of thermal desulfurization of the cracking residue in the process.

The proportion of heavy aromatic (wt.%) Of the amount of 62.0

78.9

Table 2

24.9 of its low-temperature heat treatment to obtain a binder for an anode mass {tab. 2)

During heat treatment of the cracking residue (Sample 1, Table 2) at a temperature of the invention. A method for preparing a sulfur feedstock for coking, characterized in that, in order to reduce the content of ceI

pe 420 ° C, the duration of treatment from 15 minutes to 2 hours, the following results were obtained (Table h).

Table 25 in the target product, coke, cracking / residues that bind, remove the light fractions with a refractive index of 1.56-1.59 from the previously deasphalted coal. 30 I