Coking inhibitor and preparation method and application thereof

A technology of coking inhibitors and catalysts, which is applied in the fields of corrosion/fouling treatment equipment, petroleum industry, and hydrocarbon oil treatment. It can solve the problems of low hydrogen content, low coking inhibition ability, and poor hydrogen supply capacity of coking inhibitors, and achieve Improve the critical decomposition temperature, improve the anti-coking ability, and increase the effect of hydrogen supply capacity

Inactive Publication Date: 2007-09-19
SINOPEC LUOYANG PETROCHEM ENG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Coking inhibitors used in the past used antioxidants such as sterically hindered phenols and sterically hindered amines as free radical terminators to inhibit free radical polymerization reactions; polyolefin succinimides were used as dispersants to inhibit small coke scale deposition; use polyolefin thiophosphates as detergents to clean the formed coke scale; or use detergents, dispersants and free radical terminators in combination, but this coking inhibitor can be used at 400 ° C ~ It will decompose rapidly at a high temperature of 600°C, making the effect of inhibiting coking poor
[0006] Patent CN1068623C adds a coking inhibitor with a boiling range of 350-550°C, an aromatic content of more than 60% by weight, and a bicyclic + tricyclic content of more than 30% by weight to the heavy oil and residual oil raw materials to slow down the coking of the heating furnace , the amount of coking inhibitor added accounts for 1-30% by weight of heavy oil or residual oil, but because the coking inhibitor has less hydrogen content and poor hydrogen supply capacity, the coking inhibitory ability is relatively small

Method used

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  • Coking inhibitor and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using coal tar fraction oil blended with partial ethylene tar mixed oil as raw material, adopts two-stage series connection, 30% full-fraction hydrotreating oil is recycled to the inlet process of hydro-upgrading section, and the refined catalyst is selected as Mo-Ni / Al 2 o 3 type, where MoO 3 It accounts for 15.62% of the total weight of the catalyst, and NiO accounts for 2.91% of the total weight of the catalyst; the hydrogenation modification catalyst is selected as W-Mo-Ni / Al 2 o 3 type, where WO 3 Accounting for 21.27% of the total weight of the catalyst, MoO 3 It accounts for 5.91% of the total weight of the catalyst, NiO accounts for 2.84% of the total weight of the catalyst, and accounts for 30% of the feed to the device. The full fraction hydrogenated oil is recycled to the reaction unit before the reactor. The properties of the raw oil, operating conditions and properties of the produced oil are shown in the table 1.

Embodiment 2

[0027] The distillate oil of coal tar is blended with part of the mixed oil from catalytic cracking and refined oil as the raw material, and the process of two-stage series connection and one-way operation is adopted, and the refined catalyst is W-Ni / Al 2 o 3 type, where WO 3 It accounts for 24.79% of the total weight of the catalyst, and NiO accounts for 3.05% of the total weight of the catalyst; the modified catalyst is selected as W-Mo-Ni / Al2 o 3 type, where WO 3 Accounting for 21.27% of the total weight of the catalyst, MoO 3 It accounts for 5.91% of the total weight of the catalyst, and NiO accounts for 2.84% of the total weight of the catalyst.

Embodiment 3

[0029] The whole distillate of the hydromodified oil produced in Example 1 was used as a coking inhibitor, added to the feed oil in an amount of 3% of the total weight of the feed oil, and tested on a medium-scale delayed coking test device. Tables 3 and 4 are Operating conditions and raw oil properties, when 3m% coking inhibitor is injected into the raw oil, the normal operation time of the device is increased by more than 1.5 times from 32.6 hours to 51.2 hours, and there is no adverse effect on product distribution and product properties.

[0030]

[0031] project

[0032] project name

[0033] project name

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Abstract

The invention discloses a agglomerating inhibiting agent, preparing method and application thereof. The agglomerating inhibiting agent is selected from one or more hydrogenizating upgrading products of hydrocarbon mixture of coal oil, ethylene tar oil, catalytic crackingre cycle stock, catalytic crackingre slurry oil, catalytic crackingre heavy oil, catalytic crackingre extract oil and coking hydrowax, which contain 65-100 wt% of cyclane and arene, boilingpoint is 150 DEG C to 500 DEG C. The agglomerating inhibiting agent is used for preventing, slowing and removing agglomerating of apparatus and pipilines in process of petroleum refining and petrochemical processing.

Description

technical field [0001] The invention belongs to an inhibitor for inhibiting the formation of coke scale in conversion hydrocarbon oil equipment, in particular to a coking inhibitor and its preparation method and application. Background technique [0002] As petroleum becomes heavier, the raw materials used in petroleum refining and petrochemical processing gradually become heavier and worse. The weight and deterioration of raw oil has brought great difficulties to petroleum refining and petrochemical processing, such as residual oil hydrotreating, hydrocracking, crude oil distillation and catalytic cracking, and some equipment and pipelines are easily formed. Coke fouling will block the pipeline and reduce the heat exchange efficiency of the heat exchanger. Some thermal cracking units (such as delayed coking and visbreaking, etc.) are easy to break in the heating furnace due to the heavy raw material, high asphaltene content or reaction at high temperature. The formation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G75/04
Inventor 黄新龙秦如意霍宏敏王洪彬王月霞潘延民赵晓青张亚西
Owner SINOPEC LUOYANG PETROCHEM ENG CORP
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