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Process for dehydrating hydrocarbon-based gas

一种烃基气体、气体的技术，应用在分离方法、气体燃料、气体处理等方向，能够解决液体干燥剂损失、降低液体干燥剂气体脱水的能力等问题，达到易于实施的效果

Active Publication Date: 2020-05-05
AXENS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accumulation of these very heavy hydrocarbons reduces the ability of the liquid desiccant to dehydrate the gas and forces the operator to perform a hydrocarbon purge or skim, which can result in the loss of the liquid desiccant

Method used

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  • Process for dehydrating hydrocarbon-based gas
  • Process for dehydrating hydrocarbon-based gas
  • Process for dehydrating hydrocarbon-based gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0091] refer to figure 1 An example of operation of the method of the present invention is described.

[0092] Considering the crude natural gas at saturation, 340 t / h of gas are produced, the composition of which is described in Table 1, line 12.

[0093] The gas is produced at a pressure of 75 bar g and a temperature of 35°C. The gas is saturated with water at a content of 0.1 mol%, which delivers a water flow of 330 kg / h.

[0094] After passing the crude natural gas through the drying unit 20, a dry gas is obtained with a water composition of less than 1 mole ppm, ie a flow rate of less than 0.3 kg / h, the composition of which is described in Table 1, line 21.

[0095] The desiccant liquid was triethylene glycol with a water-TEG binary purity of 99.99% by weight TEG and 0.01% by weight water.

[0096] The column for contacting the desiccant liquid with the wet gas in unit 20 operates substantially at the inlet conditions of the gas to be treated.

[0097] Unit 30 operate...

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Abstract

The invention discloses a process for dehydrating hydrocarbon-based gas. The present invention proposes to use a dry stream which is rich in C4 to C10 hydrocarbons as stripping agent for improving theregeneration of the liquid desiccant according to the invention. This dry stream rich in C4 to C10 hydrocarbons is extracted from the gas derived from the dehydration, for example during a step of extraction of NGL located downstream of the gas dehydration unit. The stream of stripping agent recovered at the outlet of the liquid desiccant regeneration unit may be recycled into the process of theinvention or sent to a unit external to the process according to the invention. For example, this stream of stripping agent recovered at the outlet of the regeneration unit is sent to a unit which canreceive wet condensates, such as a three-phase separation unit at the inlet of a crude gas processing plant, a condensate stabilization unit, etc.

Description

technical field [0001] The present invention relates to a process for dehydrating a gas by means of a liquid desiccant using an open loop of a hydrocarbon stream. Background technique [0002] Dehydration of gases such as natural gas or refinery gas is a routine operation. It makes it possible to control the water dew point, ie the water content of the gas, to avoid the formation of hydrates or ice during transport or use of this gas, to reduce the risk of corrosion, or for any other reason. [0003] For this purpose, it is common practice to contact the gas with a hydrophilic liquid desiccant. Among these desiccants, compounds of the diol chemical family are very widely used. [0004] For example, US 3 105 748 describes a glycol regeneration process according to the prior art. Such a regeneration unit comprises a thermal step of semi-regenerating the diol by separation by effecting evaporation of the water contained in the liquid diol. This separation involves a system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/26
CPCB01D53/263B01D2257/80B01D5/0057B01D53/1425B01D53/28B01D2252/2023B01D2256/24C10L3/106B01D3/14B01D53/002B01D53/265C10L2290/08C10L2290/543
Inventor P-Y.朗弗雷G.帕雷尔B.尚邦
Owner AXENS SA
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