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Method for regenerating ion exchange resin using sulfurous acid

A technology of exchange resin and sulfurous acid, which is used in the regeneration of acidic cation exchange resin and the regeneration of ion exchange resin

Active Publication Date: 2016-08-10
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One problem with using ion exchange is that the ion exchange media or resin must be regenerated from time to time

Method used

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  • Method for regenerating ion exchange resin using sulfurous acid
  • Method for regenerating ion exchange resin using sulfurous acid
  • Method for regenerating ion exchange resin using sulfurous acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Example 1 - Regeneration of SO from diamine using sulfuric acid2 Comparative Example of Sodium Removal by Absorbent

[0101] This example illustrates the use of sulfuric acid to regenerate a cation exchange resin. The absorbent provided to the test bed was a diamine absorbent contaminated with sodium. The composition is given in Table 1.

[0102] Table 1: Composition of sodium-contaminated diamine absorbents

[0103] Amine Concentration (wt%)

24.2

Sodium concentration (weight%)

2

Sulfate concentration (weight%)

12

HSAS: (equivalent SO 4 2- / mole amine)

1.1

[0104] Testing was performed using Lewatitt K-2629 strong acid ion exchange resin in a 3 cm diameter insulated column. 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. The resin was conditioned through several loading and regeneration cycles before running the experiments.

[0105] Sodium...

Embodiment 2

[0116] Example 2 - Regeneration of an acidic cation exchange resin using sulfurous acid reflux

[0117] This example illustrates the regeneration of an acidic cation exchange resin using sulfurous acid instead of sulfuric acid. Sulfurous acid as a renewable SO 2 It is obtained by reflux at the top of the stripper during the scrubbing process. SO in reflux 2 The concentration is 3.1% by weight. The resin used and other test conditions are the same as in Example 1. The flow sequences and bed volumes used for the experiments are given in Table 3.

[0118] Table 3: Flow sequence and bed volumes for regeneration of acidic cation exchange resins using sulfurous acid reflux

[0119]

[0120] The sodium and amine of waste regeneration were analyzed again, and the results are shown in Figure 6 . Depend on Figure 6 It can be seen that a considerable amount of amine elutes in the first 0.5 BV with an extremely high amine concentration (about 19,000 ppm) compared to the sodiu...

Embodiment 3

[0125] Example 3 - Regeneration of an acidic cation exchange resin using sulfurous acid reflux

[0126] This example illustrates the regeneration of an acidic cation exchange resin using 3.1 wt% sulfurous acid reflux and compares it to the regeneration of the resin using a 1 wt% sulfuric acid solution.

[0127] as follows Figure 7 As shown in the figure, the sulfurous acid regenerant preferentially elutes the amine rather than the sodium from the column compared to the sulfuric acid regeneration, thereby providing increased or comparable recovery of the amine that is less contaminated with sodium. Depend on Figure 7 As can be seen in the graph of , the amine concentration in the first 0.5 BV of the sulfurous acid reflux is significantly higher than in the first 0.5 BV of the sulfuric acid solution (22,305 ppm compared to 16,439 ppm). Furthermore, the amount of amine recovered at 1 BV when using sulfurous acid reflux is approximately equal to the amount of amine recovered a...

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Abstract

Diamine absorbents containing heat stable salts are regenerated using ion exchange, where the cation exchange resin is regenerated using sulfurous acid reflux.

Description

technical field [0001] In one aspect, the present disclosure relates to methods of regeneration of ion exchange resins. In another aspect, the present disclosure relates to methods of regeneration of acidic cation exchange resins. Background technique [0002] Separation of gases such as sulfur dioxide (SO 2 ) or carbon dioxide (CO 2 ) acid gases are well known. Many of these methods (referred to as the amine processor method) are described in "Gas Purification", 5th Edition, edited by Arthur L. Kohl and Richard B. Nielsen, Gulf Publishing Company, Houston, TX. [0003] The amine treater method uses a renewable amine solvent by which the acid gas is trapped into the solvent at a temperature and from which the acid gas is desorbed or extracted, typically at a higher temperature. [0004] The amine solvent used to remove a given acid gas component from the feed stream can be selected such that the acid gas can be removed from the solvent by steam stripping. If steam extra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J49/00B01D53/14B01D53/96
CPCB01D53/1425B01D53/1481B01D2252/2041B01J49/53Y02C20/40
Inventor M·坎贝尔J·萨利斯V·B·戈德瓦尼M·因凡蒂诺
Owner SHELL INT RES MAATSCHAPPIJ BV