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Desalting method for saliferous ethylene glycol solution

A technology of ethylene glycol and solution, which is applied in the field of desalination of salt-containing ethylene glycol solution, which can solve the problems of heavy equipment, large floor space, and high energy consumption, and achieve a wide range of sources, low cost, and reduced energy consumption. Effect

Active Publication Date: 2017-02-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these methods are physical desalination methods, and the devices used are heavy, occupy a large area, and consume a lot of energy

Method used

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  • Desalting method for saliferous ethylene glycol solution
  • Desalting method for saliferous ethylene glycol solution
  • Desalting method for saliferous ethylene glycol solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Selection experiment of organic solvent:

[0027] Prepare 25 mL of ethylene glycol solution containing 15% water and 80,000 mg / L of sodium chloride. Add 50 mL of different organic solvents to the ethylene glycol solution, adjust the pH of the first mixed solution to 7, and let stand at 50°C for 12 hours, and then filter with suction. Use silver nitrate titration to determine the Cl in the lean solution. - Content, calculate the salt content and salt removal rate in the theoretical lean solution.

[0028] Table 1 The salt removal rate corresponding to different organic solvents

[0029]

[0030] It can be seen from the data in Table 1 that when acetone is selected as the organic solvent for salt removal, the salt removal rate is the highest, so acetone is selected as the best organic solvent in the present invention.

Embodiment 2

[0032] Desalination temperature test experiment:

[0033] Prepare 25 mL of ethylene glycol solution containing 15% water and 80,000 mg / L of sodium chloride. Add 50 mL of acetone to the ethylene glycol solution, pH=7, and let the solution stand for 12 hours at 30°C, 40°C, and 50°C, and then filter with suction. Use silver nitrate titration to determine the Cl in the lean solution. - Content, calculate the salt content and salt removal rate in the theoretical lean solution.

[0034] Table 2 Salt removal rate corresponding to different temperatures

[0035]

[0036]

[0037] It can be seen from the data in Table 2 that when the solution temperature is controlled at 50°C, the salt removal rate is highest when organic solvents are added.

Embodiment 3

[0039] Desalting pH test experiment

[0040] Prepare 25 mL of ethylene glycol solution containing 15% water and 80,000 mg / L of sodium chloride. Add 50mL of acetone to the ethylene glycol solution, add acid or alkali to the solution to adjust the pH of the solution to pH=5, pH=7, and pH=9. Let stand at 50°C for 12 hours, filter with suction, and take the filtrate with nitric acid Determination of Cl in poor liquid by silver titration - Content, calculate the salt content and salt removal rate in the theoretical lean solution.

[0041] Table 3 Salt removal rate corresponding to different pH

[0042]

[0043] It can be seen from Table 3 that when the pH of the solution is controlled within the range of 5-9, the salt removal rate of ethylene glycol does not change much, indicating that the salt removal effect of the solution is not affected by pH.

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PUM

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Abstract

The invention discloses a desalting method for a saliferous ethylene glycol solution. The desalting method is characterized by including the steps of adding an organic solvent in the saliferous ethylene glycol solution to obtain a first mixed solution, adding acid or alkali to adjust potential of hydrogen of the first mixed solution so as to obtain a second mixed solution, and enabling the second mixed solution to stand for 4-12 hours. The desalting method has the advantages that operation is simple, desalting raw materials are wide in sources, low in cost and prone to being recycled, energy consumption cost can be reduced greatly, and energy conservation and environment protection are realized.

Description

Technical field [0001] The invention relates to the field of natural gas, in particular to a method for removing salt from a salt-containing glycol solution. Background technique [0002] During the development of deep ocean gas fields, the formation of hydrates will cause pipelines and equipment to block and cause the entire system to operate paralyzed. Therefore, hydrate inhibitors need to be used during gas field development to reduce the possibility of hydrate formation. [0003] Ethylene glycol is one of the most commonly used hydrate inhibitors. It is not volatile and can be mixed with water in any proportion. After mixing, it is easy to separate from water. It can be recycled and reused through simple regeneration devices in field operations. Dadi reduces system operating costs. However, the glycol recovery system currently used for offshore natural gas has encountered problems such as blockage, rejection, rot, foaming and unqualified glycol regeneration concentration. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/74C07C31/20
CPCC07C29/74C07C31/202
Inventor 全红平唐坤利冯业庆唐彬易敏李卓柯田海洋
Owner PETROCHINA CO LTD