Anti-coking agent for delaying coking and preparation method of anti-coking agent

A technology of delayed coking and coke inhibitor, which is applied in cracking, non-catalytic thermal cracking, petroleum industry and other directions, can solve the problems of not fully satisfying the delayed coking unit, low coke scale inhibition rate of coke inhibitor, etc. The effect of inhibiting free radical chain reaction and reducing coke generation

Inactive Publication Date: 2017-03-08
JIANGSU KECHUANG PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many kinds of coking inhibitors used in China, but these coking inhibitors have low coking scale inhibition rate and cannot fully meet the needs of delayed coking units.

Method used

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  • Anti-coking agent for delaying coking and preparation method of anti-coking agent
  • Anti-coking agent for delaying coking and preparation method of anti-coking agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A delayed coking retarder, comprising the following components in mass percentage: 25% pyrolysis activity accelerator, 35% free radical chain reaction inhibitor, 10% anti-scorch agent, 8% antioxidant, and the balance is solvent; After the free radical chain reaction inhibitor is mixed with the solvent, the thermal cracking activity accelerator, the anti-scorch agent and the antioxidant are added to the mixture, and then mixed.

[0026] Wherein, the thermal cracking activity promoter is propylene glycol block polyether with a molecular weight of 8000, the free radical chain reaction inhibitor is pentaerythritol polyoxypropylene ether, and the anti-scorch agent is N-cyclohexyl-2- Benzothiazole sulfenamide, the 2,6-di-tert-butyl-4-methylphenol, and the organic solvent are a mixed solvent of diesel oil and kerosene at a mass ratio of 1:1.

[0027] The delayed coking retarder prepared in this example is named as KC-1 retarder. KC-1 coking inhibitor is a dark oily liquid wit...

Embodiment 2

[0029] A delayed coking retarder, comprising the following components in mass percent: 23% pyrolysis activity accelerator, 32% free radical chain reaction inhibitor, 15% anti-scorch agent, 8% antioxidant, and the balance is solvent; After the free radical chain reaction inhibitor is mixed with the solvent, the thermal cracking activity accelerator, the anti-scorch agent and the antioxidant are added to the mixture, and then mixed.

[0030] Wherein, the thermal cracking activity promoter is propylene glycol block polyether with a molecular weight of 8000, the free radical chain reaction inhibitor is pentaerythritol glycidyl ether, and the anti-scorch agent is N-tert-butyl-2- Benzothiazole sulfenamide and N-cyclohexyl-2-benzothiazole sulfenamide are mixed in a mass ratio of 1:1, the 2,6-di-tert-butyl-4-methylphenol, the organic The solvent is a mixed solvent of diesel oil and kerosene with a mass ratio of 1:1.

[0031] The delayed coking retarder prepared in this example is nam...

Embodiment 3

[0033] The coking retarding effect of the delayed coking retarder of the present invention will be illustrated through experiments below, and an empty package test group is set up to compare with the SB-19 coking retarder commonly used in China. The experiment was carried out according to HG / T2159-1991 "Determination of Corrosion Inhibition Performance of Corrosion Inhibitors by Coupon Method"; the removal of the test piece after the test was carried out according to GB / T16545-1996 "Corrosion of Metals and Alloys, Removal of Corrosion Products on Corrosion Samples" "conduct.

[0034] Table 2 coke retarder test

[0035]

[0036] It can be seen from Table 2 that KC-1 and KC-2 coking inhibitors all show high scale inhibition rate in the concentration range of 50-100ppm, and the scale inhibition rate is above 92%. Its scale inhibition rate is also higher than that of SB-19 coking inhibitor with the same concentration.

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Abstract

The invention discloses an anti-coking agent for delaying coking and belongs to the field of petrochemical engineering. The anti-coking agent for delaying coking is prepared from components in percentage by mass as follows: 10%-30% of a thermal cracking accelerative activator, 20%-40% of a free radical chain reaction inhibitor, 1%-15% of an anti-scorching agent, 1%-15% of an antioxidant and the balance of a solvent, wherein the thermal cracking accelerative activator is block polyether, the free radical chain reaction inhibitor is pentaerythritol ether, and the anti-scorching agent is a sulfonamide agent. The anti-coking agent for delaying coking can effectively prevent and inhibit cokes from settling in a furnace tube of a heating furnace and can inhibit a free radical chain reaction, reduce production of dry gas, prevent aromatic hydrocarbon from condensation, reduce coke production, improve the thermal cracking reaction activity and improve the selectivity of a coking reaction; coking and scale depositing caused by high-temperature oxidation of raw materials in the furnace tube can be prevented, the scale inhibiting ratio reaches 92% or above, and the device running cycle is prolonged by one time or more.

Description

technical field [0001] The invention belongs to the field of petrochemical industry and relates to a delayed coking inhibitor and a preparation method thereof. Background technique [0002] As early as the 1950s, foreign countries began to study the coking mechanism and coking inhibitors, and developed a variety of coking inhibitors. The United States, Russia, Japan and other countries have entered the stage of industrial application from laboratory research, and the representative companies mainly include Nellco Chemical Company, Phillips Petroleum Company, and Bates Research Company. Domestic Liaoning Petrochemical University, Beijing Research Institute of Chemical Industry, Hebei Institute of Technology, Daqing Petroleum Institute, etc. have carried out the development of coking mechanism and coking suppression technology since the early 1980s. [0003] At present, most of the heating furnaces of delayed coking units in my country have a serious tendency of coking and fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G9/16
Inventor 顾齐欣孙建宜
Owner JIANGSU KECHUANG PETROCHEM
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