Process for producing a gas stream depleted of mercaptans

A logistics and gas technology, applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve problems such as a large number of regeneration gases, troublesome regeneration of adsorbents, and multiple regeneration times.

Active Publication Date: 2008-07-02
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The regeneration of the adsorbent is relatively troublesome
Especially large adsorbent beds req

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 (comparison)

[0055] A feed gas stream having the composition indicated in column A of Table 1 was contacted with an absorption liquid comprising MDEA and piperazine in an adsorber unit at a temperature of 45°C and a pressure of 60 barg. The composition of the gas stream leaving the adsorber unit is shown in column B of Table 1 . The gas stream leaving the adsorber unit is contacted with a large adsorbent bed comprising 13X zeolite. The gas stream leaving the adsorbent bed still contained RSH concentrations greater than 10 ppmv as measured using gas chromatography.

Embodiment 2

[0056] Embodiment 2 (the present invention)

[0057] A feed gas stream having a composition as indicated in column A of Table 1 was contacted with an absorption liquid comprising a physical solvent at a temperature of 45°C and a pressure of 60 barg. The composition of the gas stream leaving the adsorber unit is shown in column C of Table 1 . The gas stream leaving the adsorber unit is contacted with a small adsorbent bed comprising 13X zeolite. The RSH concentration in the gas stream leaving the adsorbent bed was less than 2 ppmv as measured using gas chromatography.

[0058] Table 1: Component concentrations in mol%. All BTX compounds and all RSH in ppmv.

[0059] A

[0060] It is evident from the examples that the process of the present invention is capable of producing an RSH-depleted gas stream with an RSH concentration of less than 2 ppmv. The comparative method results in a gas stream with an RSH concentration greater than 10 ppmv.

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PUM

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Abstract

The present invention provides a process for producing an RSH-depleted gas stream from a feed gas stream comprising natural gas, RSH and an aromatic compound selected from the group consisting of benzene, toluene, ortho-xylene, meta-xylene and para-xylene, said process comprising the steps of : (a) contacting said feed gas stream with an absorption liquid comprising a physical solvent in an aromatics removal zone to obtain aromatics comprising benzene, toluene, ortho-xylene, meta-xylene and para-xylene a loaded absorption liquid of compounds and a gas stream depleted of these aromatic compounds; (b) contacting the gas stream obtained in step (a) with a solid adsorbent in a mercaptan removal zone to obtain an RSH-loaded solid adsorbent agent and RSH-depleted gas stream.

Description

technical field [0001] The present invention relates to a process for producing a gas stream depleted in mercaptans (RSH) from a natural gas stream comprising RSH and an aromatic compound selected from the group consisting of benzene, toluene, ortho-xylene, meta-xylene and para-xylene. Background technique [0002] Producing an RSH-depleted gas stream from a natural gas stream comprising RSH and an aromatic compound selected from the group consisting of benzene, toluene, ortho-xylene, meta-xylene, and para-xylene includes removing RSH. Removal of RSH from gaseous streams containing these compounds has been of considerable importance in the past and is even more so today in view of continuing stringent environmental regulations. [0003] Many natural gas wells produce "sour gas", that is, typically with aromatic compounds selected from benzene, toluene, o-xylene, m-xylene, and p-xylene and additional sulfur-containing compounds such as H 2 Natural gas containing RSH together...

Claims

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Application Information

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IPC IPC(8): B01D53/04B01D53/14
CPCB01D53/04B01D53/1487B01D53/1493B01D2253/108B01D2253/308B01D2257/306B01D2257/7027
Inventor A·卡尔松T·拉斯特J·B·拉贾尼
Owner SHELL INT RES MAATSCHAPPIJ BV
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