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Combined process for cogeneration of needle coke and light oil

A light oil product and combined process technology, which is applied in the petroleum industry, coke ovens, and hydrocarbon oil treatment, can solve the problems of needle coke raw materials shortage, limited range of raw materials, and difficult-to-manufacture enterprises.

Inactive Publication Date: 2008-11-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Obviously, the range of raw materials targeted by these methods is relatively limited, and it is difficult to be widely used in production enterprises.
At present, heavy hydrocarbons (such as straight-run gas oil, coker gas oil, heavy oil, atmospheric and vacuum residue, ethylene tar, etc.) Serious shortage of high value-added needle coke raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: The hydrocarbon raw material A (a kind of atmospheric residue, wherein the content of saturated hydrocarbons, aromatic hydrocarbons, asphaltenes are respectively 50.0wt%, 49.8wt%, 0.2wt%, metal calcium content 350μg g -1 , sulfur, nitrogen content are respectively 0.1wt% and 0.4wt%) carry out thermal pretreatment, device feed rate 0.6kg·hr -1 , the inlet and outlet temperatures are 440°C and 430°C respectively, the outlet pressure is 0.4MPa(G), and the residence time is 30min. As a result, 45wt% vacuum gas oil (VGO, distillation range 360-520°C) and 40wt% gasoline and diesel oil are obtained. And chemical light oil fraction (distillation range 36 ~ 360 ℃), 13wt% heavy residue (VR, distillation range> 520 ℃). Then the intermediate product VGO is used as needle coke raw material for delayed coking reaction, wherein the coke tower inlet temperature is 430-505°C (programmed temperature rise), the coke tower top pressure is 0.6MPa(g), the circulation ratio is 0...

Embodiment 2

[0014] Embodiment 2: the hydrocarbon raw material B (a kind of coker wax oil, the content of saturated hydrocarbon, aromatic hydrocarbon, asphaltenes wherein is respectively 65.0wt%, 34.9wt%, 0.1wt%, sulfur, nitrogen content are respectively 0.3wt% % and 0.5wt%) for thermal pretreatment, device feed rate 0.6kg·hr -1 , the inlet and outlet temperatures are 450°C and 435°C respectively, the outlet pressure is 0.4MPa(G), and the residence time is 35min. As a result, 52wt% vacuum gas oil (VGO, distillation range 360-530°C) and 36wt% gasoline and diesel oil are obtained. And chemical light oil fraction (distillation range 36~360°C), 10wt% heavy residue oil (VR, distillation range> 530°C). Then the intermediate product VGO is used as needle coke raw material for delayed coking reaction, wherein the coke tower inlet temperature is 420-495°C (programmed temperature rise), the coke tower top pressure is 0.9MPa(g), the circulation ratio is 0.5, and the feed rate is 1kg·hr -1 , the coke...

Embodiment 3

[0016] Example 3: The hydrocarbon raw material B mixed with 10wt% industrial hydrogen-donating agent was processed according to the combined process, and the processing conditions were carried out according to Example 2. Results The obtained coke showed a well-developed streamlined needle-like structure, and its thermal expansion coefficient CTE was 2.33×10 after being calcined at 1400°C. -6 ℃ -1 , obviously a qualified needle coke. The solid content of the intermediate product VR is less than 0.1wt%, and it is transferred into a common delayed coking feed for processing.

[0017] The present invention has the advantage that:

[0018] (1) Expand the raw material adaptability of refinery enterprises;

[0019] (2) The product structure of oil refining enterprises is optimized;

[0020] (3) Each process in the combined process is a well-known mature technology;

[0021] (4) The combined process operation has a cost advantage over other heavy oil lightening processes.

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Abstract

The invention provides a technique for combining joint needle coke and light oil products, comprising the following steps that: firstly, thermal pretreatment of hydrocarbon raw materials is performed, and rapid cracking reaction compositions and rapid condensation reaction compositions are respectively cracked and condensed into light oil fractions (with a distillation range of 360 DEG C below zero) and heavy residual fuel oil (with a distillation range of 540 DEG C); secondly, the needle coke is prepared by delayed coking of residual hydrocarbon-enriched vacuum gas oil fractions (with a distillation range of between 360 and 540 DEG C), wherein, the heavy residual fuel oil obtained during the process of thermal pretreatment is taken as common delayed coking mixing feeding materials, and the light oil fractions obtained during the two stages can be distilled so as to obtain gasoline and diesel oil fractions with high added-value. The hydrocarbon raw materials used comprise mixture of one type or a plurality of types among virgin wax oil, coked wax oil, dense oil, atmospheric and vacuum residue, ethylene char oil an so on. The combination technique is characterized by mild thermal pretreatment condition (with a reaction temperature of between 380 and 495 DEG C). The technique has the advantage of simultaneously enlarging the source of needle coke raw materials and the means of converting heavy inferior raw oil into light inferior raw oil.

Description

technical field [0001] The invention relates to a combined process for producing needle coke and light oil products in the technical field of chemical engineering, in particular to process one or more hydrocarbon raw materials and their mixtures through a combined process of thermal pretreatment-delayed coking to obtain high Value-added qualified needle coke products can also produce high-quality gasoline and diesel oil and chemical light oil fractions. Background technique [0002] Although the parameters of the delayed coking process have a certain influence on the properties of the prepared needle coke, the needle coke industry has strict restrictions on the composition and properties of the raw materials. Therefore, people have aroused great interest in upgrading raw materials for needle coke production. Chinese patent CN1118537C uses vacuum flash method to remove quinoline insoluble matter in coal tar, CN1180056C uses solvent extraction method to remove catalyst powder...

Claims

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Application Information

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IPC IPC(8): C10G57/00C10B55/00
Inventor 郭爱军王宗贤任志惠田凌燕赵红涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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