Aldehyde and ketone inhibitor for alkaline washing tower of ethylene unit

An ethylene device and inhibitor technology, which is applied in the fields of hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems such as the dispersion effect of polymers and the limitation of rapid dispersion effect of butter polymers, etc. Scale generation, reduce equipment blockage, and prolong the operation cycle

Active Publication Date: 2012-07-04
天津市瑞德赛恩新材料开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this inhibitor considers the idea of ​​simultaneously inhibiting aldehyde-ketone condensation and olefin free radical polymerization, it does not mention that it has a dispersing effect on polymers, so there are limitations in the inhibition of butter and the rapid dispersion of polymers

Method used

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  • Aldehyde and ketone inhibitor for alkaline washing tower of ethylene unit
  • Aldehyde and ketone inhibitor for alkaline washing tower of ethylene unit
  • Aldehyde and ketone inhibitor for alkaline washing tower of ethylene unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of aldehyde and ketone inhibitor is prepared by the method comprising the following steps:

[0040] Add 180g of N-phenyl-α-naphthylamine, 200g of 2-mercaptothiadiazole, 150g of diethylaminoethanol, 180g of polysuccinimide, and 290g of deionized water into the container, and heat up while stirring. Stir at constant temperature after reaching 40°C, mix evenly, and filter to obtain the inhibitor product.

[0041] The aldehyde and ketone inhibitor in Example 1 is applied to the ethylene alkali washing tower simulation device, the cracking raw material is naphtha, the total yield of ethylene, propylene, and butadiene in the cracking gas is slightly 48.7%, and the sodium hydroxide in the alkali washing tower The concentration of the inhibitor is 7.65%, and the inhibitor is added to the circulating lye at one time, and the addition amount is 50ppm. The device runs continuously for 2 hours, calculates the weight of butter in the lye, and compares it with the amount of bu...

Embodiment 2

[0047] A kind of aldehyde and ketone inhibitor is prepared by the method comprising the following steps:

[0048] Add 100g 2,6-di-tert-butyl-p-cresol, 100g N,N-dialkylaminomethylenebenzenetriazole, 150g ethyleneamine, 100g monosuccinimide, and 550g deionized water to In the container, the temperature was raised while stirring, and the temperature was raised to 40° C., then stirred at a constant temperature, and after mixing evenly, the product was obtained by filtration.

[0049] Others are with embodiment 1.

Embodiment 3

[0051] A kind of aldehyde and ketone inhibitor is prepared by the method comprising the following steps:

[0052] 250g 2,6-di-tert-butylphenol, 200g 2-mercaptothiadiazole, 200g diethanolamine, 200g macromolecular succinimide, 150g deionized water are added to the container, and the temperature is raised while stirring, and the temperature is raised to Stir at a constant temperature after 40°C, mix evenly, and filter to obtain the product.

[0053] Others are with embodiment 1.

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Abstract

The invention relates to an aldehyde and ketone inhibitor for an alkaline washing tower of an ethylene unit, wherein the inhibitor comprises the components by mass percent: 10-25% of antioxidant, 10-20% of metal deactivator, 15-20% of polymerization inhibitor, 10-20% of dispersing agent and the balance of solvent. The aldehyde and ketone inhibitor can be used for effectively inhibiting the condensation reaction between aldehyde and ketone in oil phase and water phase in the alkaline washing tower with pertinence; the aldehyde and ketone inhibitor has antioxidant and polymerization inhibition functions at the same time, thus having an effective inhibition function for polymerization reaction caused by unsaturated hydrocarbon; the aldehyde and ketone inhibitor can be reacted with sulfide, so that polysulfide can further be prevented from being formed by the sulfide, and the generation of scaling substance can be inhibited; and the dispersing agent is added into the aldehyde and ketone inhibitor, so that the generated large polymers can be dispersed into small polymers; and therefore, the small polymers can be dispersed and dissolved in waste alkali liquid to be discharged, the blockage of equipment can be reduced, and the operation cycle of the equipment can be prolonged.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to an aldehyde and ketone inhibitor for an alkali washing tower of an ethylene plant. Background technique [0002] Cracked gas is the raw material for ethylene production, in which there are more acidic substances, such as CO 2 、H 2 S, etc., acid gas will cause catalyst poisoning and pollute the product ethylene during the ethylene polymerization process, so the cracked gas must be washed with alkali. There are two main sources of acid gas, one is that it is brought into the system with the raw materials, and the other is that carbon dioxide will be generated when the raw materials are converted, especially when the cracking furnace tubes are coked. The content of carbon dioxide in the outlet gas of the cracking furnace increases with the cracking cycle. [0003] The pyrolysis gas will produce a large amount of liquid polymer in the process of alkali washing, which will for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C7/20
Inventor 林洪新
Owner 天津市瑞德赛恩新材料开发有限公司
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