Flexible method for the treatment of a solvent, such as monoethylene glycol, used in the extraction of natural gas

A solvent and pretreatment technology, applied in the direction of separation methods, mining fluids, chemical instruments and methods, etc., can solve problems such as difficulty in adapting

Inactive Publication Date: 2015-05-27
PROSERNAT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This phenomenon is random and un...

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  • Flexible method for the treatment of a solvent, such as monoethylene glycol, used in the extraction of natural gas

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Embodiment Construction

[0038] will refer to figure 1 The present invention is described with the layout of the present invention: the solvent is MEG, but the diagram can be described with any other solvent defined in the present invention; "MEG" can be replaced by "solvent".

[0039] Pretreatment is advantageously carried out upstream of the appropriate process.

[0040] The MEG to be processed (supplied via line 1 ) is typically separated in tank 4 from gases (exit via line 2 ) and condensate from hydrocarbons (exit via line 3 ). Trace or small amounts of hydrocarbons, condensate or gases may remain, depending on the strength of the separation.

[0041] The obtained MEG contains water and salt. It is optionally neutralized, for example using sodium hydroxide (supplied via line 5).

[0042] Preferably, MEG is separated from gases, condensates and hydrocarbons, followed by neutralization.

[0043] The MEG was also preheated.

[0044] The MEG to be treated contains a high proportion of water (typ...

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Abstract

The invention concerns a flexible process for purifying a solvent which inhibits the formation of hydrates during gas processing, in particular monoethylene glycol (MEG), said solvent having a boiling point which is higher than that of water and, at least at one point in time, being mixed with water and salts, the process operating in a different manner with the same facility as a function of the quantity of salts in the MEG to be treated. The process operates in accordance with a phase known as reclaiming (separation of salts under vacuum followed by vacuum distillation) when the salts content exceeds the precipitation threshold and if not, the process operates in a regeneration phase (absence of separation of salts and no operation under vacuum). Advantageously, the change is made under the control of means for testing the salts.

Description

technical field [0001] The present invention relates to a method for purifying solvents, especially monoethylene glycol, which are used in natural gas fields to prevent hydrate formation. The solvent has a higher boiling point than water and is mixed with water and salt at least at one point in time. Background technique [0002] Such hydrates are formed in the presence of water, natural gas and under conditions favorable to their stability. [0003] Their presence can be extremely detrimental to operations, as blockages can form in extraction pipelines or in transport pipelines, which can lead to shutdowns. [0004] This problem is particularly acute for offshore platform operations, where gas is mined in a relatively cold medium, which favors the formation of hydrates, and where gas processing is off-shore, whereby mined gas is transported to on-shore facility and at a temperature where the hydrate is stable. [0005] It is known to use hydrate formation inhibitors such...

Claims

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Application Information

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IPC IPC(8): B01D3/06B01D3/10C07C29/74C07C29/76C07C31/20E21B43/34
CPCC07C29/80B01D3/148B01D3/06C07C31/202B01D3/10B01D3/34B01D53/1425B01D2252/2023
Inventor J. 埃斯基耶B. 尚邦C. 施特雷谢尔
Owner PROSERNAT SA
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