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Method for lightening salt deposition of catalytic fractionating tower

A fractionation tower and salt formation technology, which is applied in the field of reducing salt formation in catalytic fractionation towers, can solve problems such as high salt content in residual oil, reduction of salt content in catalytic feed, and inability to remove organic chlorine in residual oil.

Active Publication Date: 2012-05-02
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem of high salt content in residual oil, the residual oil electric desalination process reported in CN1032434C, before the residual oil enters the catalytic device, undergoes electrical desalination again, which can greatly reduce the salt content in the catalytic feed, but this method cannot remove the residual oil Organochlorine in

Method used

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  • Method for lightening salt deposition of catalytic fractionating tower
  • Method for lightening salt deposition of catalytic fractionating tower
  • Method for lightening salt deposition of catalytic fractionating tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An actual distillation experiment was carried out on a certain crude oil in Zhongyuan Oilfield, and the distribution of organic chlorine in each fraction was analyzed. The results are shown in Table 1. It can be seen from the experimental results that the content of organic chlorine in naphtha is relatively high, as high as 177.1mg / kg. This part of organic chlorine is likely to come from wax removers added in the oil recovery process, such as dichloroethane, dichloropropane, chloroform, carbon tetrachloride, epichlorohydrin, etc., whose boiling point is 60-116 °C. Atmospheric distillation, most of it enters the naphtha fraction. The content of organic chlorine in the diesel fraction at 160-350°C is relatively low, 5.3mg / kg. The organic chlorine content in the atmospheric residue is also relatively high, reaching 107.9 mg / kg. This part of organic chlorine may come from the decomposition of chlorinated hydrocarbons in the atmospheric distillation process, which is the ma...

Embodiment 2

[0032] The experiment simulates the determination method of salt content in crude oil, and the dechlorination experiment is carried out on the atmospheric residual oil respectively. Add 1g of oil sample, 1.5ml of xylene, 2.0ml of ethanol-water (1:3) solution, and 200μg / g of basic compound (see Table 2) into the test tube, mix thoroughly on the shaker, and draw out the water after centrifugation Phase, analysis of Cl - Concentration, the experimental results are shown in Table 2. It can be seen from Table 2 that after the atmospheric residual oil is washed with water, the water phase Cl - The concentration is 316.0 mg / kg. After adding basic compound for treatment, the aqueous phase Cl - The concentration increased from 316.0mg / Kg to 505.0mg / Kg, indicating that the basic compound has a removal effect on the organic chloride in the residual oil.

[0033] Table 2

[0034] Dechlorination agent

Embodiment 3

[0036] The atmospheric residue of Zhongyuan crude oil has a salt content of 15mgNaCl / L and a total chlorine content of 22mgNaCl / L. The difference between total chlorine and salt content is 7mgNaCl / L of organic chlorine.

[0037] The brand name of the demulsifier used is FC9301, and the basic compound consists of ethylenediamine and NH3 ·H 2 O is composed in a weight ratio of 1:7. The added amount of the demulsifier is 50 μg / g, and the added amount of the basic compound is 200 μg / g.

[0038] Mix the demulsifier and basic compound with water in a certain proportion to form a solution, the water injection rate is 10%, mix the aqueous solution with crude oil preheated to 90-100°C on a commercially available juicer for 20 seconds, and use DP-2C The demulsifier selection instrument is used for oil-water separation, the electric field strength is 300V / cm, and the temperature is 95°C. After the oil-water separation, the oil sample is added with demulsifier and washed with water twice...

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Abstract

The invention relates to a method for lightening the salt deposition of a catalytic fractionating tower, wherein residual oil is pre-treated by an electro-desalting technique before entering in a catalytic cracking device; an alkaline compound is added during the electro-desalting process; and the alkaline compound is water-soluble organic amine and / or inorganic alkali. Utilizing the method disclosed by the invention, inorganic salts and organic chlorides in residual oil can be efficiently removed before the residual oil enters in a catalytic cracking device, thereby lighting the salt deposition of a catalytic fractionating tower.

Description

technical field [0001] The invention relates to a method for alleviating salt formation in a catalytic fractionation tower. Background technique [0002] Salt formation in the catalytic fractionation tower will lead to an increase in the pressure drop of the entire tower, damage the top cycle reflux, out of control of the dry point of naphtha, and the fractionation tower cannot operate normally. Catalytic fractionation tower salt is mainly composed of NH 4 caused by Cl. [0003] The raw material for catalytic cracking is usually atmospheric residue, and the nitrogen compounds and chlorine compounds carried in it will generate NH during the catalytic cracking process. 3 and HCl, NH 3 Reacts with HCl to form NH 4 Cl, NH 4 Cl decomposes into NH 3 and HCl, in the upper part of the fractionator, NH 3 Regenerate NH after cooling with HCl 4 Cl. NH 4 Cl is very soluble in water, fine NH 4 Cl particles dissolve in the local low-temperature water phase, and the NH 4 The aq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G55/06C10G32/02C10G7/10
Inventor 王振宇王征李本高沈明欢
Owner CHINA PETROLEUM & CHEM CORP
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