Method for purifying degraded amine solution

A technology for deteriorating amine and amine liquid, which is applied in the field of filtration and removal of impurities and amine liquid purification of strong base-weak base mixed resin to achieve the effect of improving utilization rate, improving removal effect and reducing cost

Inactive Publication Date: 2011-07-20
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a novel amine liquid purification technology aiming at the current technical status of organic amine solution purification, which can r...

Method used

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  • Method for purifying degraded amine solution
  • Method for purifying degraded amine solution
  • Method for purifying degraded amine solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0027] In four 100mL beakers, put 10mL of fresh strong basic resin A (D201), strong basic resin B (201), weak basic resin C (D301) and weak basic resin D ( D318), add 25mL of degraded amine solution and soak for 4h. The removal effect of each ion exchange resin on each ion is shown in Table 1. It can be seen from Table 1 that the removal effect of each type of resin on each acid ion is not the same, and the removal effect is related to the basic strength and pore structure of the resin, and the selectivity of each resin to different acid ions is different. .

[0028] Table 1 The removal effect of four different resins on each acid radical ion

[0029]

[0030] The fixed bed is filled with molecular sieve as the filter medium to filter the solid impurities of the degraded amine liquid. Add 6mL of mixed resin into a glass column with an inner diameter of 10mm, resin A and resin D each 3mL, the filling height-to-diameter ratio of the mixed resin is 3:1, where the resin A and resin D...

Embodiment 3～6

[0038] Fill the 6mL resin A in Example 1 into a glass column with an inner diameter of 10mm, and carry out the investigation experiment of the amount of regenerant in turn. 5mL and 15mL of 8wt% lye are added respectively. After the lye is completely removed from the glass column, add Rinse with deionized water until the pH of the solution is close to neutral, add 10 mL of the filtered amine solution, and test the ion content in the amine solution after running twice. The detection and analysis results are shown in Example 3 and Table 4 Example 4 shown.

[0039] Examples 5 and 6 respectively investigated the influence of the concentration of the regeneration solution on the removal effect of each acid radical, adding 10 mL of 2wt% and 6wt% lye respectively, after the lye was removed from the glass column, added deionized water to wash, the pH value of the solution When it is close to neutral, add 10 mL of the filtered amine solution, and detect the ion content in the amine solutio...

Embodiment 7

[0043] The fixed bed is filled with activated carbon as a filter medium to filter the solid impurities of the degraded amine liquid. Add 6 mL of mixed resin into a glass column with an inner diameter of 10 mm, resin A and resin D 3 mL each, and mix the two resins. The filling height-to-diameter ratio of the mixed resin is 1:1. Add 10mL of the filtered amine solution, and keep the space velocity at 50h at 10℃ -1 , After running twice, the content of each ion in the amine solution was detected. The results showed that the mixed resin can have a good removal effect on each ion in the amine solution.

[0044] Regenerate the resin after the exchange experiment and remove it. Add 10 mL of 6wt% lye to the resin after the exchange experiment. After the lye is completely removed from the glass column, add deionized water for high-pressure water injection countercurrent flushing. At 30℃, the space velocity is 40h -1 , Until the pH value of the solution is close to neutral, add 10 mL of the...

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Abstract

The invention relates to a method for purifying a degraded amine solution. In the method, solid purities, thermal stable salts and degraded products in an alcohol amine solution are removed by filtration, impurity removal and a strong alkali-weak alkali mixed resin purification process. Solid granules in the alcohol amine solution are removed by using a filter medium such as a molecular sieve, active carbon or an ion exchange membrane or the like; and then the filtered alcohol amine solution is subjected to ion exchange through strong alkali-weak alkali mixed resin to remove the thermal stable salts and the degraded products in the alcohol amine solution. When the pressure drop of the amine solution passing through the filter medium is over high and the airspeed is low, the filter medium is regenerated or replaced, and the regenerated resin is recycled. The method has the advantages that: the loss of the resin can be reduced by filtration and impurity removal, regeneration of the resin is favorable, and the regeneration cost is reduced; and synchronous removal of multiple ions in the alcohol amine solution can be realized by using different ion selectivity of the strong alkali-weak alkali mixed resin, and the removal efficiency is improved.

Description

Technical field [0001] The invention belongs to the purification technology of amine absorbents, and specifically relates to an amine liquid purification method for filtering and removing impurities and strong alkali-weak alkali mixed resin. Background technique [0002] Use organic amine aqueous solution to remove acid gas (H 2 S, CO 2 , SO 2 Etc.) is a common method in the oil and gas industry. Industrially, due to the periodic use of organic amine solution, it is easy to cause the decomposition, oxidation and compounding of amine solution with other impurities, resulting in a large number of pollutants, resulting in a reduction in the purification efficiency of the amine solution. These pollutants mainly come from the decomposition and oxidation of feed gas, amine liquid, and corrosion of the system, and they eventually exist in the form of solid particles, degradation products and heat stable salts. [0003] The continuous accumulation of a large number of impurities, degradat...

Claims

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Application Information

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IPC IPC(8): B01D53/96B01D53/77B01J47/04
Inventor 李晓刚胡洋杨仁春崔德鹏侯开明
Owner UNIV OF SCI & TECH BEIJING
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