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Method and device for preventing fractionation tower salt coagulation

A fractionation tower and salt accumulation technology, which is applied in the field of preventing salt formation in fractionation towers, can solve problems such as entry and abnormal production of fractionation towers, and achieve high utilization rates

Inactive Publication Date: 2015-02-11
LUOYANG PETROCHEMICAL ENG CORP SINOPEC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned two patents adopt the method of directly adding washing water to the fractionation tower to remove salt NH in the tower. 4 The method in which Cl is dissolved in washing water and washed away requires a large amount of water to enter the fractionation tower, and the fractionation tower is in an abnormal production state during the salt washing process

Method used

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  • Method and device for preventing fractionation tower salt coagulation

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Embodiment 1

[0029] A method for preventing salt accumulation in a fractionation tower. The distillate oil in the liquid receiving tank of the fractionation tower with a temperature of 110°C is mixed with NH 4 The mixed solution of Cl aqueous solution is extracted, and after cooling down, it enters the oil-water separation tank for oil-water separation. The oil phase is heated to the temperature when it is extracted and returns to the fractionation column tray when it is extracted, containing NH 4 The aqueous Cl phase was discharged.

Embodiment 2

[0031] A method for preventing salt accumulation in the upper fractionation tower, the distillate and NH 4 The mixed solution of Cl aqueous solution is extracted, and after cooling down, it enters the oil-water separation tank for oil-water separation. The oil phase is heated to the temperature when it is extracted and returns to the fractionation column tray when it is extracted, containing NH 4 The aqueous Cl phase was discharged.

Embodiment 3

[0033] A device for preventing salt accumulation in a fractionation tower, comprising a fractionation tower 1, a tray 2, a liquid receiving tank 10, and an oil-water separation tank 5, the tray 2 and the liquid receiving tank 10 are arranged in the fractionation tower 1, and the fractionation tower 1 and the oil-water separation tank 5 is communicated, and described fractionation tower 1 is communicated with oil-water separation tank 5 by extraction pipe 14 and return pipe 15, and extraction pipe 14 and return pipe 15 are provided with heat exchanger 4 and heat exchanger 8, and extraction pipe 14 is provided with Extraction pump 3, return pump 6 is provided on return pipe 15, fresh water main inlet 7 and replacement fraction injection port 9 are provided on return pipe 15, brine outlet 13 is provided at the lower part of oil-water separation tank 5, tray 2 and receiving liquid The tank 10 is set at a temperature of 110-130° C. in the fractionation tower 1 .

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Abstract

The invention discloses a method and a device used for preventing fractionation tower salt coagulation. According to the invention, a mixed liquid of distillate oil and NH4Cl water solution in a tray liquid tank of a fractionation tower with a temperature of 110-130 DEG C is pumped out; the mixed liquid is cooled, and is subjected to oil-water separation in an oil-water separation tank; the oil phase is heated to a temperature same as that when pumped out, and is returned to the fractionation tower; and a water phase comprising NH4Cl is discharged. According to the invention, the utilization rate of space in the tower is high, and salt-removing effect is good.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method and equipment for preventing salt accumulation in a fractionation tower. Background technique [0002] A fractionation tower is a device for separating mixed volatile liquids. In the petrochemical industry, fractionation towers are mainly used for rectification and separation of crude oil or separation of a specific mixed petroleum fraction. [0003] At present, the commonly used fractionation towers in the petrochemical industry include atmospheric fractionation towers, vacuum fractionation towers, catalytic cracking towers, and coking fractionation towers. [0004] In recent years, with the deterioration of crude oil, the content of various heteroatoms such as sulfur, nitrogen, and chlorine has continued to increase, resulting in varying degrees of salt formation in each fractionation tower of the subsequent processing unit. Then enter the subsequent processing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/10
CPCC10G7/10
Inventor 孙炳玺崔中强崔新安申明周
Owner LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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