Processing method of tinpot oil

Abstract

The invention relates to a processing method of tinpot oil, comprising the following steps: a, an oil-soluble catalyst and a heavy oil raw material are uniformly mixed and the mixture is then sent into a hydrogenation reactor to carry out a hydrogenation reaction under the existence condition of hydrogen; b, a liquid product obtained from the hydrogenation reaction enters a distiller to be cut into light oil and tail oil; c, the tail oil from the step b undergoes general hydrocyclone separation to obtain slag-removed tail oil and tailings; d, the slag-removed tail oil from the step c is sent into a delayed coker to undergo thermal cracking so as to obtain light distillate oil, dry gas and coke; and e, the tail oil from the step c is roasted and metal in the oil-soluble catalyst is recovered. By the above method, residual oil conversion rate is raised; green coke during the process is avoided; the problem that it is difficult to hydrotreat tail oil and metal in the catalyst cannot be recovered is solved; and the problem that coke obtained by coking of a high-sulfur raw material cannot be used is solved. Light distillate oil yield is raised by 10%. The technology is simple; the method is convenient to operate; investment is low; and the method is environmentally friendly.

Description

technical field [0001] The invention relates to a treatment method for processing low-quality heavy oil, which includes a combined process of hydrogenation treatment-tail oil coking-tail residue roasting. Background technique [0002] Crude oil resources are increasingly scarce in the world, and the quality of crude oil is becoming heavier and worse, while the demand for petroleum products is increasing, which requires the full and effective use of limited crude oil resources. Among them, the effective utilization of inferior heavy oil is the key to make full use of crude oil. In addition to the production of a small amount of asphalt in the utilization of inferior heavy oil, most of it needs to be lightened to produce light distillate products. At present, the main technologies for lightening heavy oil in the existing technology include decarburization and hydrogenation. The decarburization process is greatly affected by the properties of the raw oil, especially when the ...

AI Technical Summary

Problems solved by technology

Although this process increases the conversion rate of light oil, it does not fundamentally solve the problem of reducing the coke production of the unit and reducing the dry gas output

[0007] In addition, when the suspension bed hydrocracking and coking process are combined, due to the high impurity content in the inferior raw material, the value suspension bed catalyst cannot be separated and enters the coking raw material, so that the solid petroleum coke obtained in the coking process is of poor quality and difficult to use and handle

[0008] Hydroprocessing of inferior heavy oil can increase the yield of liquid products, but the quality of the generated tail oil is poor and difficult to handle, which is also one of the main problems restricting the development of inferior heavy oil hydrogenation process

The tail oil after hydrotreatment of inferior heavy oil contains a large amount of impurities such as residual carbon, ash, sulfur, nitrogen and metals, and cannot directly enter the coking unit, because directly entering the coking unit will lead to high sulfur content in the coke product, which cannot be used and is easy to cause environmental pollution

In addition, because there are many impurities in the tail oil, it is easy to block the bed and poison the catalyst. Therefore, it is not possible to use a fixed bed for hydrofining to desulfurize and denitrify.