Process for treating salt deposition in fractionating tower

A fractionation tower and salt formation technology, which is applied in the field of corrosion control of oil refinery units, can solve problems such as time-consuming, equipment shutdown or reduction, and hidden dangers of corrosion, and achieve the effects of easy on-site operation, avoiding under-deposit corrosion, safety, time saving and cost saving

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a process for treating salt accumulation in fractionation towers of catalytic cracking units and delayed coking units, so as to overcome the shortcomings of the prior art, such as time-consuming, unit shutdown or reduction, and hidden dangers of corrosion.

Method used

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  • Process for treating salt deposition in fractionating tower
  • Process for treating salt deposition in fractionating tower
  • Process for treating salt deposition in fractionating tower

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment is to test the inhibitory ability of the inhibitor to ammonium chloride crystalline salt. In a 200mL three-necked flat-bottomed flask, add 100 grams of catalytic gasoline from a refinery. The properties of the catalytic gasoline are shown in Table 1, then add 1 gram of ammonium chloride solid powder, stir slowly in a water bath at 50°C, and stop stirring after 30 minutes. A solid powder of ammonium chloride was observed to deposit on the bottom of the flask. Slowly add 1.5 grams of the inhibitor in the catalytic gasoline with a dropper in a ratio of dodecylamine: tetraethylenepentamine: n-butanol: heavy aromatics = 30: 35: 15: 20, slowly stir Find that the ammonium chloride solid powder disappears gradually, and observe that bubbles escape in gasoline, stop stirring after 5 minutes and find that the ammonium chloride solid powder disappears completely.

[0032] Table 1 Properties of catalytic gasoline

[0033] catalytic gasoline

Embodiment 2

[0035] In the delayed coking unit of a refinery, the coking fractionation column often has large fluctuations in the top cycle, and the top cycle pump often evacuates intermittently, and the temperature at the top of the tower fluctuates greatly, the dry point of naphtha rises, and the color turns black. After salt formation occurs in the coking fractionation tower, a salt formation inhibitor is added before the inlet of the top circulating pump of the fractionation tower. The ratio of the salt formation inhibitor is isooctylamine: dodecylamine: n-butanol: heavy aromatics = 30:30: 20:20, the addition amount is 40mg / kg, and after 36 hours of operation, the operation of the fractionation tower returns to normal. Table 2 shows the properties of coked gasoline before and after adding the salt formation inhibitor.

[0036] Table 2 Properties of coker gasoline before and after adding salt inhibitor

[0037] catalytic gasoline

Embodiment 3

[0039] The heavy oil catalytic cracking unit of a refinery often has the problem of salt accumulation in the fractionation tower, the pressure drop of the tray increases, and the dry point of gasoline products fluctuates greatly. , after salt formation occurs in the catalytic cracking fractionation tower, a salt formation inhibitor is added to the top reflux line, and the salt formation inhibitor ratio is dodecylamine: tetraethylenepentamine: n-butanol: heavy aromatics=30:35: 15:20, the injection amount is 30mg / kg, after 45 hours of operation, the operation of the fractionation tower returns to normal. Table 3 shows the properties of the catalytic gasoline before and after adding the salt formation inhibitor.

[0040] Table 3 Properties of Catalyzed Gasoline Before and After Adding Salt Deposition Inhibitor

[0041] catalytic gasoline

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Abstract

The present invention discloses a process for treating salt deposition in a fractionating tower. A purpose of the present invention is to overcome disadvantages of time consuming, device shutdown or amount reducing, hidden danger of corrosion, and the like in the prior art, wherein the amount is the amount of the deposited salt. The method comprises that: a salt deposition inhibitor is consecutively added to the an oil product before the oil product enters a tower top reflux pipeline of the fractionating tower or a tower top circulating pump inlet of the fractionating tower, wherein 30-60 mg of the salt deposition inhibitor is added to per kg of the oil product in the tower top reflux pipeline of the fractionating tower or the tower top circulating pump inlet of the fractionating tower, the adding time is 30-60 hours, the salt deposition inhibitor comprises, by weight, 30-70% of an aliphatic nitrogen compound, 10-30% of alkyl alcohol and 20-40% of an organic solvent.

Description

technical field [0001] The invention belongs to the field of corrosion control of oil refinery units, more specifically relates to a process for treating salt deposits in oil refinery units, and is especially suitable for dealing with ammonium salt fouling problems in fractionation towers of catalytic cracking units and delayed coking units. Background technique [0002] In recent years, with the development trend of heavy and inferior crude oil and the sharp increase in the market demand for light oil products, the deep processing of crude oil has become the main direction of the development of the oil refining industry. Among them, the heavy oil catalytic cracking and delayed coking process, as the main means of lightening heavy oil, has received more and more attention from the oil refining industry. The raw materials of delayed coking unit or heavy oil catalytic cracking unit contain relatively high heteroelements such as N, S, O, Cl, etc., and it is easy to generate NH ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/10C10G9/16
Inventor 于凤昌李朝法段永锋崔新安崔中强彭松梓李春贤
Owner CHINA PETROLEUM & CHEM CORP
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