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Method for preventing fractionating tower from salt deposition

A fractionation tower and salt accumulation technology, which is applied in the field of preventing fractionation tower salt accumulation, can solve problems such as no fractionation tower

Inactive Publication Date: 2012-10-03
李小燕
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Industrial devices are usually treated by regular water washing. At present, there is no effective method to prevent the formation of salt on the upper part of the fractionation tower.

Method used

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  • Method for preventing fractionating tower from salt deposition
  • Method for preventing fractionating tower from salt deposition
  • Method for preventing fractionating tower from salt deposition

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Experimental program
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Effect test

Embodiment Construction

[0015] figure 2 A catalytic cracking unit anti-salt fractionation tower and schematic flow diagram are provided. The upper part of the fractionation tower 3 is provided with a top circulation reflux section, including a 3-4 layer tower plate 1 and an oil collection tank 2, and a liquid level gauge 8 is located in the oil collection tank 2. Top cycle dehydration facilities include dehydration tank 10, top cycle oil pump 12, lower return tower regulating valve 14, lower return tower heat exchanger 15, upper return tower cooler 6, upper return tower heat exchanger 7, upper return tower regulating valve 17.

[0016] The reaction oil gas 4 containing water vapor, NH3 and HCl at 480-500°C enters from the lower part of the fractionation tower 3 . The oil gas rises in the fractionation tower and enters the top circulation reflux area. The temperature of the top circulation oil returns to the tower is low (60-90°C), so that part of the water vapor in the oil gas condenses into water,...

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Abstract

The invention discloses a method for preventing a fractionating tower from salt deposition, which belongs to the technical field of petrochemical industry and is used for solving the salt deposition problem on the upper part of a fractionating tower. The upper part of the fractionating tower is provided with appliances such as a separating member tower board, a filler or an oil collection tank. According to the method, the oil collection tank and a dewatering apparatus are arranged on the lower part of the water-containing section separating member of the upper part of the fractionating tower in order to drain the liquid-phase water out of the tower, thereby thoroughly solving the salt deposition problem on the upper part of the fractionating tower.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a method for preventing salt accumulation in a fractionation tower. Background technique [0002] The raw material oil for secondary processing units such as heavy oil catalytic cracking and coking is the wax oil or residual oil from the atmospheric and vacuum distillation unit. Due to the poor operation status of the crude oil electric desalting unit of the atmospheric and vacuum unit or the use of auxiliary oil during the crude oil extraction process in the oil field The residual oil raw material will contain impurities such as nitrides, sulfides and inorganic salts. Nitrogen compounds and inorganic salts are decomposed into NH3 and HCl under high temperature conditions, and NH3 and HCl are easily combined at low temperatures to form H4Cl, which is soluble in water in the form of H4Cl aqueous solution. It exists in the gaseous form of NH3 and HCl in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G53/02C10G7/10
Inventor 不公告发明人
Owner 李小燕
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