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Process for treating diamine absorbent streams

An absorbent, water flow technology used in the field of operating ion exchange processes

Active Publication Date: 2016-03-30
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid gas absorbent is preferably obtained from an acid gas recovery unit

Method used

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  • Process for treating diamine absorbent streams
  • Process for treating diamine absorbent streams
  • Process for treating diamine absorbent streams

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Example 1 - Renewable SO from diamine 2 Sodium removal from absorbents

[0093] This example illustrates the use of cation exchange resins to remove sodium from diamine absorbents. The absorbent supplied to the test bed was sodium contaminated Cansolv Absorbent DS. The components are shown in Table 1.

[0094] Table 1: Components of sodium-contaminated diamine absorbents

[0095] Amine Concentration (wt%) 24.2 Sodium concentration (wt%) 2 Sulfate concentration (wt%) 12 HSAS: (eq. SO 4 2- / mole amine) 1.1 Water (wt%) 61.8

[0096] The test was carried out in a 3 cm diameter insulated column with Lewatitt K-2629 strong acid ion exchange resin. The resin bed had a height of 35 cm and a bed volume (BV) of 200 ml. All fluids introduced into the column were at 50°C. Prior to designing this experiment, the resin was processed through several cycles of loading and regeneration.

[0097] Sodium removal experiments were carried ou...

Embodiment 2

[0108] The effect of amine heat stable salt level on sodium removal performance was tested. Again, the sodium-contaminated Cansolv Absorbent DS was used in this experiment. The experimental conditions are shown in Table 3.

[0109] Table 3: Composition of spent absorbent

[0110]

[0111] The same procedure as Example 1 was used, but following the fluid conditions in Table 4.

[0112] Table 4: Fluid Conditions for Example 2

[0113]

[0114] The regeneration effluent was analyzed for amines and the results are shown in Figure 6 . A summary of sodium removal efficiency and amine loss is shown in Table 5. It is clear that low amounts of thermostable salts favor higher sodium removal and lower amine losses.

[0115] Table 5: Amine loss at various thermostable salt concentrations

[0116]

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Abstract

The present invention relates to the regeneration of diamine absorbents comprising heat stable salts using an ion exchange process wherein the concentration of heat stable salts in the feed stream to the cation exchange unit is limited.

Description

technical field [0001] One aspect of the invention relates to a method of treating a diamine absorbent stream comprising at least one thermally stable salt. In a particularly preferred aspect, the invention relates to a method of operating an ion exchange process during the regeneration of an acid gas diamine absorbent. Background technique [0002] Separation of acid gases such as sulfur dioxide (SO 2 ) or carbon dioxide (CO 2 ) is well known. Many such methods, known as amine treater methods, are described in Gas Purification, Fifth Edition, Ed. Arthur L. Kohl and Richard B. Nielsen, Gulf Publishing Company, Houston, TX. [0003] Amine separation methods use a regenerable amine solvent, draw the acid gas into the solvent at one temperature, and desorb or separate the acid gas from the solvent, usually at a higher temperature. [0004] The amine solvent used to remove acid gas components from the feed stream may be selected such that the acid gas can be removed from the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/96B01D53/14
CPCB01D53/1425B01D53/1456B01D53/1493B01D2252/2041B01D2252/20431B01D2257/302B01D2257/304B01D2257/404B01D2257/504C10L3/103C10L3/104B01J39/05B01J49/06B01J49/08B01J41/07
Inventor M·坎贝尔J·萨利斯V·B·古瓦尼M·因凡蒂诺
Owner SHELL INT RES MAATSCHAPPIJ BV