JP2665059B2 - Treatment method for heavy oil cracking residual oil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating heavy oil-cracked residual oil, and aims at effectively utilizing the residual oil after cracking heavy oil and recovering a light fraction.

[0002]

2. Description of the Related Art Pyrolysis is one of the techniques for lightening heavy oils, and the number of pyrolysis residual oils remaining in the lightened products is reduced by the number of pyrolysis residues.
It contains sludge, a precursor of coke, which is as small as 10 microns or more, and cannot be sold as general heavy oil or used as a raw material for further processing such as hydrocracking. Did not. Conversely, in order to sell the pyrolysis residual oil as heavy oil, the intensity of pyrolysis must be kept low in order to keep sludge generation low, and thus the low light oil yield must be maintained. Items to be satisfied by the fuel oil include a flash point, a viscosity, and the like. These must be within a certain range for external sales and the like, but the viscosity, the density, and the like can be satisfied by mixed dilution. On the other hand, for the purpose of using it for external sales, etc., there is no special rule item, but the EDS value (Exis
ting Dry Sludge; According to Shell Method SMS-2696-83. same as below. Is important to be less than 0.15% by weight. However, the EDS value is not improved by the mixed dilution, but rather worsens. Therefore, in terms of increasing the yield of light oil, efficient cracking residual oil has a high EDS value, and it can be used as it is as a raw material for further processing such as hydrocracking, etc. Can not. Therefore, EDS
The task of processing a residual oil having a high value into an oil having a sufficiently low EDS value and effectively utilizing any by-products from the processing has not been achieved.

[0003]

The present invention has been proposed as a result of studies to achieve the above object. That is, the present invention provides an EDS
The value 0.15 wt% or more of heavy oil cracking residual oil, LCO (Light C
ycle Oil), CLO (Clarified Oil) and diesel oil
After mixing with distillate oil selected from Diesel Oil and performing the following centrifugation at a viscosity of 25 cP (centipoise) or less, the temperature is 200-250 ° C, gravitational acceleration 1,000-2,000G, (gravitational acceleration) × (residence time) = Continuous centrifugation under conditions of 40,000-100,000 G · sec.
This is a method for treating heavy oil cracking residual oil that obtains an oil component having a DS value of less than 0.15% by weight.

The residual oil to be treated by the present invention has an EDS value of 0.15% by weight or more, which is unsuitable for external sales. Contains about 1 to 4% by weight. As mentioned above, it is virtually impossible to reduce this by simple dilution. Although centrifugation at 200 to 250 ° C. Such residual oil in the present invention, in order to carry out this centrifugation efficiently flow fluidized bed catalytic cracking (FCC, Fluidized Catalytic Cracking) called LCO from (Light Cycle Oil), CLO (Clarified O
il) and diesel oil (Diesel Oil),
The viscosity at the centrifugal separation temperature in a specific distillate oil rich in aromatic components is 25 cP or less, preferably 20 cP or less, more preferably 15 cP or less.
Perform dilution after the following. These distillates are
Although the flash point is 60 ° C. or higher, distillate oil having a flash point of less than 60 ° C. is not used because the oil sold outside has a property uncommon as a so-called heavy oil. Centrifugal acceleration is 1,000
~ 2,000G, preferably 1,400 ~ 1,800G, more preferably
1,500 to 1,600 G, (gravitational acceleration) × (residence time) [hereinafter referred to as G × T] = 40,000 to 100,000 G · sec, preferably 60,000 to 75,000 G · sec. Centrifugation is E
Since the gravitational acceleration is 1,00
If it is less than 0 G, the separation is insufficient. Also, the gravitational acceleration is 2,000G
Beyond the above, there is no effect corresponding to the increase in equipment and operation costs. This is the same for G × T.

The present inventor studied the effective use of the residue of the method of the present invention.
The fuel for heavy oil fired burners with a temperature of 200-250 ° C and a viscosity of 40 cSt (centistosox) or less obtained by mixing heavy oil cracking residual oil with an EDS value of 0.15% by weight or more is used for heavy oil burners used in factories. We have confirmed that it is fully available.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Patent No. 1454959 (JP-B-62-56)
No. 917) (so-called HS).
C: High-Severity Soaker Cracking) was used to treat the visbreaking residual oil as a heavy oil to obtain the light components and residues (HSC-R) shown in Table 1. The properties of the raw material visbreaking residual oil are shown in the rightmost column of Table 1. Table 2 shows the properties of HSC-R. This was mixed with the components shown in Table 2 in the proportions shown in Table 2 to obtain treated oils I to III having the properties shown in Table 2. This at 220 ° C for 15
When continuous centrifugation was performed at 00G and G × T = 60,000 G · sec, the EDS value was less than 0.15% by weight in all cases. This residue
Mix 2,000 parts by weight of HSC-R with 100 parts by weight to obtain a viscosity of 35 cSt (250 ° C).
Supplied and utilized at 50 ° C.

[0007]

[Table 1]

[0008]

[Table 2]

[0009]

According to the present invention, the heavy oil cracking residue having a high EDS value and which is difficult to use effectively can be effectively used by centrifuging under specific conditions, and the obtained residue can be mixed with the residue to obtain an effective residue. It can be used, and the efficient use of heavy oil cracking residual oil has been made possible.

Claims (2)

(57) [Claims] 1. An EDS value (Existing Dry Sludge; Shel
l According to Method SMS-2696-83) 0.15% by weight or more of heavy oil cracking residual oil is converted to LCO (Light Cycle Oil), CLO (Cla
rified Oil) and diesel oil (Diesel Oil).
The viscosity at temperature at which the following centrifugation by mixing barrel distillate from the following 25 cP (centipoise), the temperature 200 to 250 ° C., the gravitational acceleration 1,000 ~2,000G, (gravitational acceleration) × (retention time) = 40,000 Perform continuous centrifugation under conditions of ~ 100,000 Gsec.
A method for treating heavy oil-cracked residual oil, which obtains an oil having a DS value of less than 0.15% by weight. 2. The viscosity at a temperature of 200 to 250 ° C. obtained by mixing the centrifugal sludge obtained in claim 1 with a heavy oil cracking residue having an EDS value of 0.15% by weight or more as a raw material in claim 1. 40
Fuel for heavy oil-fired burners up to cSt (Centistosox).