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Anti-coking agent, and its preparation and use method

A coke inhibitor and reaction technology, applied in the field of new coke inhibitor, can solve the problems of poor thermal stability, single function of coke inhibitor, and decreased use effect, so as to achieve improved coke inhibitor effect, enhanced coke inhibitor efficiency, and simple and easy production. row effect

Inactive Publication Date: 2005-12-21
LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 4. Corrosion product deposition caused by equipment corrosion
The previous scorch inhibitors had only one function, and antioxidants such as hindered phenols and hindered amines were used as free radical terminators to inhibit free radical polymerization; polyolefin succinimides were used as dispersants to inhibit small Deposition of coke scale; use polyolefin thiophosphate as detergent to clean the formed coke scale; or simply compound detergent, dispersant and free radical terminator
For example, in the prior art US4835332, US4900426, US5171421 and US5183555, polyisobutylene succinimide or its derivatives are used to disperse and solubilize the formed coke scale; but these products have poor thermal stability, The use effect will decrease when it is greater than 300°C; US4927519 and US4828674 disclose the use of polysulfide alkylphenol compounds to inhibit the formation of coke scale; JP 3115589 discloses the use of thiophene and thiazole compounds to control the formation of coke scale; US4775458 and US4927561 discloses compounding detergents and antioxidants to control the formation of coke scale

Method used

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  • Anti-coking agent, and its preparation and use method
  • Anti-coking agent, and its preparation and use method
  • Anti-coking agent, and its preparation and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Structures and preparation methods of novel compounds A1 and B1.

[0041] 1. The structural formula of novel compound A1 is formula (6), and the structural formula of B1 is formula (7):

[0042]

[0043] 2. Preparation method

[0044] (1) Add 24.4g 2,6-dimethylphenol, 12.2g monoethanolamine and 180ml xylene in a 500ml four-neck flask equipped with a stirrer, a thermometer, a water separator and a dropping funnel, start stirring, and put the oil bath heating. When the temperature rises to 92°C, formaldehyde solution (37-38%, 16.0g) is added dropwise, and the dropwise addition of formaldehyde is completed after 1 hour; the temperature rises to 120-150°C and reacts for 3 hours until no more water comes out of the water separator. Reaction product (theoretical amount 13.6 ml).

[0045] (2) Add 22.2g of phosphorus pentasulfide and 100ml of mixed xylene in the flask equipped with agitator, thermometer, and dropping funnel, start stirring, after heating to 60°C, start to...

Embodiment 2

[0047] Structures and preparation methods of novel compounds A2 and B2.

[0048] 1. The structural formula of novel compound A2 is formula (8), and the structural formula of B2 is formula (9)

[0049]

[0050] 2. Preparation method

[0051] (1) Add 41.2g 2,6-dibutylphenol, 12.2g monoethanolamine and 180ml xylene in a 500ml four-neck flask equipped with a stirrer, a thermometer, a water separator and a dropping funnel, start stirring, and put the heating. When the temperature rises to 92°C, formaldehyde solution (37-38%, 16.0g) is added dropwise, and the dropwise addition of formaldehyde is completed after 1 hour; the temperature rises to 120-150°C and reacts for 3 hours until no more water comes out of the water separator. Reaction product (theoretical amount 13.6 ml).

[0052] (2) Add 22.2g of phosphorus pentasulfide and 100ml of mixed xylene in a flask equipped with a stirrer, a thermometer, and a dropping funnel, start stirring, and after heating to 60°C, start to add...

Embodiment 3

[0054] Structures and preparation methods of novel compounds A3 and B3.

[0055] 1. The structural formula of novel compound A3 is formula (10), and the structural formula of B3 is formula (11)

[0056]

[0057] 2. Preparation method

[0058] (1) Add 44g of nonylphenol, 12.2g of monoethanolamine and 180ml of xylene into a 500ml four-neck flask equipped with a stirrer, thermometer, water separator and dropping funnel, start stirring, and heat in an oil bath. When the temperature rises to 92°C, formaldehyde solution (37-38%, 16.0g) is added dropwise, and the dropwise addition of formaldehyde is completed after 1 hour; the temperature rises to 120-150°C and reacts for 3 hours until no more water comes out of the water separator. Reaction product (theoretical amount 13.6 ml).

[0059] (2) Add 22.2g of phosphorus pentasulfide and 100ml of mixed xylene into a flask equipped with a stirrer, a thermometer, and a dropping funnel, start stirring, heat up to 60°C, then start to drop...

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Abstract

This invention discloses a kind of burnt hinder and preparing and application, it is that a kind of structure general formula is the chemical composition of the type (l): R1 and R2 are the alkyl of hydrogen or C1- C20 respectively in the type, R3 and R4 are the alkyl of hydrogen or C1- C12 respectively, and R4 and R3 can't be the hydrogen while, n is the integer of 2-6, A is S or O atom. The invention offer burnt hinder for petroleum refining and petrochemical industry processing course, in order to prevent, delay and dispel the equipment and pipeline to accumulate the dirt burnt or knot effectively.

Description

technical field [0001] The invention belongs to the field of petroleum refining and petrochemical industry, and relates to a novel coking retarder used for related equipment in petroleum refining and petrochemical processing and its preparation and application method. Background technique [0002] With the continuous deepening of the trend of petroleum heavy quality, the raw materials used in petroleum refining and petrochemical processing gradually become heavier and worse. The weight and deterioration of raw oil brings great difficulties to petroleum refining and petrochemical processing, such as certain equipment such as pipelines and heat exchangers in residual oil hydrotreating, hydrocracking, crude oil distillation and catalytic cracking. It is very easy to form coke scale, block the pipeline, and reduce the heat transfer efficiency of the heat exchanger. Some thermal cracking units (such as delayed coking, distillate oil cracking to ethylene, etc.) Furnace, cracking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G75/00
Inventor 杨莹潘延民赵东明刘志龙田淑梅
Owner LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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