JPS60123554A - Stabilized heavy oil composition - Google Patents

Abstract

PURPOSE:A stabilized composition that is obtained by combining visbreaking residue and heavy oil deasphalted with a solvent, thus resisting the formation of sludge. CONSTITUTION:(A) 99-70wt% of visbreaking residue and (B) 1-30wt% of heavy oil fraction from which asphalten is removed by means of solvent are combined. When the mixture of components A and B has high viscosity, a light oil fraction is preferably admixed as a cutter component, if necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stable heavy oil composition, and more particularly to a stable heavy oil composition comprising a visbreaking residual oil and a solvent-layered asphalt.

The visbreaking method is a type of thermal cracking process aimed at reducing the viscosity of heavy oil or producing light oil. Residual oil is produced by thermal cracking from the bottom of the distillation column or vacuum flash column located after the heating furnace. This produces heavy oil.

However, this heavy oil obtained as a visbreaking residual oil has a drawback that it has poor stability and tends to generate sludge over time.

As a result of repeated research aimed at overcoming this drawback of visbreaking residual oil, the present inventors found that sludge is less likely to be generated by blending solvent layer asphalt 1 to visbreaking residual oil. They discovered that a stable heavy oil composition can be obtained and completed the present invention.

That is, the present invention provides a stable heavy oil composition consisting of (A) 99 to 70% by weight of visbreaking residual oil and (B) 1 to 30% by weight of solvent-layered asphalt.

The contents of the present invention will be explained in more detail below. As mentioned above, component (A) in the present invention is a heavy oil obtained as a residual oil from the bottom of a distillation column or a vacuum flash column when crude oil 11 is cracked in a visbreaking process and the cracked oil is fractionated. It refers to the distillate.

The visbreaking method is a type of pyrolysis method that can reduce the viscosity of heavy oil and produce light oil without performing advanced cracking.
The raw material oil includes heavy oil, especially asphaltene-containing hydrocarbons, such as high viscosity vacuum distillation residual oil.

An example of the visbreaking method is as follows. The raw material oil is pressurized by a Chi-11 pump, and after preheating, it is sent to a heating furnace where it is heated to a temperature of about 410 to 500°C and a pressure of 7 to 3.
0k (J/C scrap/G, especially 10-25kg/crA/
Use G to carry out the thermal decomposition reaction. In this case steam, hydrogen or hydrogen donors can be added. The decomposition reaction can be carried out in a tube or in a soaker drum. The cracked oil that has left the reaction zone is rapidly cooled with, for example, Kuchinji oil to stop the cracking reaction and prevent over-decomposition. Furthermore, the cracked oil is fractionated in a distillation column and a vacuum flash column, and is separated into gas, naphtha, cracked oil, cracked residual oil, etc. Component (A) in the present invention refers to this cracked residual oil.

For details on the visbreaking method, please see, for example, ``Petroleum Refining Process (Popular Edition), edited by the Japan Society of Petroleum, New Edition'' (
Saiwai Shobo〉pages 44-47''.

On the other hand, component (B) as used in the present invention refers to asphalt that is produced as a by-product when raw oil is subjected to solvent film removal using a low molecular weight hydrocarbon solvent.

This solvent film cleaning method uses liquid propane, butane, pentane, etc., which have a low dissolving power for high molecular weight hydrocarbons, to extract raw oils such as atmospheric distillation residues, vacuum distillation residues, cracked residues, etc. This method separates the asphalt and resin components by precipitation to obtain deasphalted oil with high viscosity and low residual carbon, sulfur, and heavy metals. An example of this solvent film coating method is as follows.

Solvent JJf2 scree wrestling generally consists of a descaling section and a solvent recovery section, and the descaling section is a baffle tower Ab.
Using an extraction tower such as a rotating disk tower, feedstock oil is charged from near the top of the tower and a solvent such as propane, butane, pentane is charged from near the bottom of the tower, heated to approximately 50 to 200°C, and the solvent evaporates at that temperature. The most widely used method is a countercurrent extraction column, in which deasphalted oil is recovered from the top of the column and asphalt containing a solvent is recovered from the bottom of the column. In this way, the deasphalted oil and asphalt containing the solvent are separated from the solvent in the next solvent recovery section, and deasphalted oil and asphalt with a solvent film are obtained.

For details of this solvent IB, i-removal method, see
This is explained in the December 1976 issue of Kagaku Kogyo, pages 31-40.

In the heavy oil composition of the present invention, the component (A) and (B)
The blending ratio of the components is 1 to 30% by weight of the component (B) to 99 to 70% by weight of the component (A). In addition, in the present invention, when the viscosity of the mixture of (A>component and (B) component is high), the viscosity of the composition is determined according to the heavy oil standard (JIS K 2205).
If necessary, light oil fractions may be mixed as a cutter material in order to make it compatible with the cutter material.

The present invention will be described in more detail below based on Examples and Comparative Examples.

Example 1 and proportional examples 1 to 2 2. Blend visbreaking residual oil and propane deasphalt asphalt in the proportions shown in Table 1, and further add 24.8 volumes of light oil fraction to the mixture as a cutter material. % and the viscosity at 50'C is 180c3t as the invention product.
A heavy oil composition was prepared (Example 1).

For comparison, we present two examples: Chinoku Comparative Example 1) using only the same visbreaking residual oil, and Chinoku Comparative Example 1) in which Arabian Light vacuum distillation residual oil is blended with visbreaking residual oil instead of propane-deasphalted asphalt. 2) was also prepared.

However, in these Comparative Examples 1 and 2, similarly to Example 1, light oil fraction was added as a cutter material, and the viscosity at 50°C was 180°C.
Adjust so that it becomes cSt.

The compositions of Example 1 and Comparative Examples 1 and 2 are shown in Table 1. The properties of the visbreaking residual oil, propane deasphalt asphalt, Arabian Light vacuum distillation residual oil, and light oil fraction used as cutter material are shown below.

1, Visbray Viscosity 160℃ 36cSt King residual oil ioo℃ 480cSt Xylene equivalent 5 (i/130 Specific gravity 1,0113 2, Arabian Rye 1-

Claims (1)

[Scope of Claims] 1. A stable heavy oil composition comprising (Δ) 99 to 70% by weight of visbreaking residual oil and (B) 1 to 1 to 30% by weight of solvent-layered asphalt.