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Combined process for delayed coking and hydrotreating

A hydrotreating and delayed coking technology, applied in the combined process field, can solve the problems of heavy distillation range of coking wax oil, complex fractionation tower process, high aromatics content, etc., achieve process optimization, ensure long-term operation, reduce coke yield and The effect of gas yield

Active Publication Date: 2012-07-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coker gas oil obtained under the condition of low circulation ratio or zero circulation ratio has the characteristics of heavy distillation range, high impurity content and high aromatic content
At the same time, such a conventional process is not suitable for the maximum production of liquid products, and the fractionation tower process is complicated

Method used

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  • Combined process for delayed coking and hydrotreating
  • Combined process for delayed coking and hydrotreating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The raw material oil used in Example 1 is high-sulfur residue reduction, and its properties are listed in Table 1.

[0033] The reaction conditions of delayed coking are that the temperature at the outlet of the heating furnace is 500°C, the coke tower top pressure is 0.17MPa, and the circulation ratio is 0. The coke tower top oil gas is separated into gas components and liquid components after heat exchange and cooling. Coking whole distillate liquid components (including naphtha, diesel oil and wax oil fractions) are pressurized and carried out with hydrogen in a reactor under hydrotreating conditions, and the reactor is filled with a hydrotreating agent and a hydrotreating catalyst , the ratio of the two is 15:85, and the specific reaction conditions, product distribution and product properties are listed in Table 2-Table 4 respectively.

[0034] As can be seen from Table 2, the coking liquid product yield is 63.7% by weight, and as can be seen from Table 4, the sulf...

Embodiment 2

[0036] The feedstock oil used in Example 2 is acid-containing naphthenic residue, and its properties are listed in Table 5.

[0037] The reaction conditions of delayed coking are that the temperature at the outlet of the heating furnace is 500°C, the coke tower top pressure is 0.17MPa, and the circulation ratio is 0. The coke tower top oil gas is separated into gas components and liquid components after heat exchange and cooling. Coking whole distillate liquid components (including naphtha, diesel oil and wax oil fractions) are pressurized and carried out with hydrogen in a reactor under hydrotreating conditions, and the reactor is filled with a hydrotreating agent and a hydrotreating catalyst , the filling ratio is 15:85, and the specific reaction conditions, product distribution and product properties are listed in Table 6-Table 8 respectively.

[0038] As can be seen from Table 6, the coking liquid product yield is 71.23% by weight, and as can be seen from Table 8, the sulf...

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Abstract

The invention discloses a combined process for delayed coking and hydrotreating, which comprises the following steps that: a coking raw material is heated to enter a coking tower to react, oil gas escapes from the top of the coking tower, gas components and liquid components are separated, and the cycle ratio in a coking process is 0; and the liquid components are mixed with hydrogen to react in a hydrogenation reactor, then the obtained hydrogenated reaction effluent is distilled to obtain hydrogenated naphtha, hydrogenated diesel oil and hydrogenated wax oil, and the hydrogenated wax oil used as a high-quality raw material is fed into a catalytic cracking device or a hydrocracking device. By adopting the process flow of zero circulation of a coking device, the method provided by the invention furthest improves the yield of a liquid product, improves the processing depth of heavy oil, saves a coking fractionating tower, and achieves the aims of optimizing the flow and reducing the investment; and by adopting reasonable graduation of a hydrogenation catalyst, the method can furthest take account of the running period and the refining depth of each coking product fraction.

Description

technical field [0001] The invention belongs to a multi-step process for treating hydrocarbon oil in a thermal conversion step and a multi-step process for treating hydrocarbon oil in the presence of hydrogen, more specifically, it is an organic combination of two processes of delayed coking and coking whole distillate hydrotreating combined process method. Background technique [0002] At present, the world is facing the trend of crude oil becoming heavier and worse. People's demand for heavy fuel oil is gradually decreasing, while the demand for light oil is greatly increasing. Therefore, the lightening of heavy oil is the key to how to use limited oil resources to produce light products in a large amount. Because asphaltenes, metals, and residual carbon are almost all concentrated in the vacuum residue (residue reduction), the residue reduction is the most difficult to deal with. The main processes for processing and reducing slag include residual oil hydrotreating, cat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G69/06
Inventor 胡志海蒋东红张毓莹王子文龙湘云王子军
Owner CHINA PETROLEUM & CHEM CORP
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