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Coking method to increase liquid yield

A technology for liquid and coking raw materials, applied in the field of coking process, can solve problems such as low liquid yield

Active Publication Date: 2017-03-15
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Based on this, it is necessary to provide a coking method for increasing the liquid yield to solve the problem of low liquid yield in the coking process of heavy oil

Method used

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  • Coking method to increase liquid yield
  • Coking method to increase liquid yield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The vacuum residue is mixed with 10wt% hydrogenated catalytic distillate oil and then enters the visbreaking-coking unit. The visbreaking reaction conditions are: reaction temperature 410°C, residence time 30min, reaction pressure 0.5MPa, and the visbreaking product passes through the visbreaking flash tank Vis-reduced oil and gas and vis-reduced residue are separated (see Table 2 for properties). The vis-reduced oil and gas enter the coking fractionation tower, and the vis-reduced residue enters the delayed coking unit. The coking reaction conditions are: reaction temperature 490°C, coke tower top pressure 0.18 MPa, the coking cycle ratio is 0.

[0088] Investigate the pressure drop of the coking heating furnace tube and the oil and gas temperature at the top of the coke tower. During the test, coking gas, coking liquid products and coke were collected, and the yield of coking products using visbreaking residue as raw material was calculated. The results are shown in T...

Embodiment 2

[0090] The vacuum residue enters the visbreaking-coking unit, and 10wt% hydrogenated catalytic distillate oil is heated to 520°C and then injected into the coke tower. The visbreaking-coking process conditions are the same as in Example 1.

[0091] Investigate the pressure drop of the coking heating furnace tube and the oil and gas temperature at the top of the coke tower. During the test, coking dry gas, coking liquid products and coke were collected, and the yield of coking products using visbreaking residue as raw material was calculated. The results are shown in Table 2.

Embodiment 3

[0093] The vacuum residue is mixed with 5wt% hydrogenated catalytic distillate oil and then enters the visbreaking-coking unit. At the same time, the 5wt% hydrogenated catalytic distillate oil is heated to 525°C and then injected into the coke tower. The visbreaking-coking process conditions are the same as in Example 1 same.

[0094] Investigate the pressure drop of the coking heating furnace tube and the oil and gas temperature at the top of the coke tower. During the test, coking dry gas, coking liquid products and coke were collected, and the yield of coking products using visbreaking residue as raw material was calculated. The results are shown in Table 2.

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Abstract

The invention provides a coking method for improving liquid yield. The method includes the steps of: mixing a coking raw material with hydrogenation catalytic distillate oil to obtain mixed oil; and subjecting the mixed oil to visbreaking-coking or coking to obtain coked liquid. The invention also provides other two coking methods for improving liquid yield. According to the coking method for improving liquid yield, hydrogenation catalytic distillate oil is added, the hydrogenation catalytic distillate oil contains a lot of hydrogenated aromatic hydrocarbon and can improve the nature of coking raw materials, hydrogenated aromatic hydrocarbon can release a lot of active hydrogen free radicals under high temperature, and active hydrogen free radicals can combine with aromatic ring free radical, asphaltene free radical, olefin and the like to form stable hydrocarbons (distillate oil component), thereby effectively terminating free radical thermal cracking and condensation reaction, making the thermal cracking reaction mainly stay in the homolytic reaction stage, and increasing the yield of coking liquid.

Description

technical field [0001] The invention relates to a coking process, in particular to a coking method for increasing liquid yield. Background technique [0002] With the increasing degree of crude oil deterioration and increasingly stringent environmental protection requirements for oil products, how to convert heavy oil into light oil with high efficiency and high quality has become an urgent problem to be solved in the oil refining industry. Although delayed coking has the advantages of low investment and operation costs and mature technology, it has problems such as easy coking of preheating furnace tubes and low yield of coking liquid. Visbreaking belongs to mild thermal cracking, which mainly produces fuel oil and some middle distillates. Due to the restriction of reaction conditions, the conversion rate of raw materials is not high. The hydrogen visbreaking process and the hydrogen visbreaking process developed in recent years have improved the product quality while incr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/00
Inventor 李华佘喜春朱国荣黄华田娟王波
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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