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Method for inhibiting degradation of desulfurization liquor of methyldiethanolamine

A technology of methyldiethanolamine and desulfurization solution, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve problems such as reducing MDEA oxidation degradation

Active Publication Date: 2008-08-27
SINOPEC NANJING RES INST OF CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above additives can only partially alleviate the oxidative degradation of MDEA

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 1mol of tert-butylamine, 100ml of water and 5g of phosphoric acid in sequence in a four-necked flask equipped with a thermometer, stirrer, condenser and feeder, replace with nitrogen, keep the temperature at 40°C, start to add 1mol of propylene oxide dropwise, and maintain the temperature at 60°C ℃, the dropwise addition is completed in 1 hour, and then reacted for 1 hour, the product is vacuum distilled and dehydrated, and the dehydrated product is added with anhydrous MgSO 4 Dry and filter with suction to obtain a light yellow transparent viscous intermediate product. Then add the above-mentioned intermediate product and 2 g of KOH to the high-pressure reactor, replace with nitrogen, then add 0.8 mol of ethylene oxide, control the feeding speed so that the temperature of the reactor is not higher than 150 ° C, after the feeding is completed, aging for 1 hour, the reaction The still was evacuated to 15mmHg, maintained for 10min, and then discharged to obtain 142.6g...

Embodiment 2

[0017] Prepare mixed gas (15%H 2 S+35%CO 2 +50%O 2 ), at a speed of 100mL / min at 85°C, 100mL of MDEA solutions with different compositions were passed through, and the degradation rate of MDEA was measured after reaching the reaction time. The experimental results are shown in Table 1.

[0018] Table 1. Antioxidant test results of different additives

[0019] Preface

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PUM

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Abstract

The invention relates to a method for restraining the degradation of dimethyl ethanolamine desulfuration solution, wherein it uses one additive to reduce the degrade rate of dimethyl ethanolamine solution. And said additive is formed by reacted butylamine and epoxypropane which is polymerized with epoxyethane.

Description

Technical field: [0001] The invention belongs to the technical field of gas purification, and in particular relates to a method for inhibiting solvent degradation during the process of removing H2S in gas with methyldiethanolamine aqueous solution. Background technique: [0002] Methyldiethanolamine (MDEA) aqueous solution is used to remove H from gas 2 S, which has the advantages of high selectivity, high acid gas load, low energy consumption and corrosiveness, has been widely used in industry. However, MDEA, like other alkanolamines such as diethanolamine and monoethanolamine, degrades after being used for a period of time, resulting in a decrease in the performance of the solution and causing production problems such as solution foaming and corrosion. [0003] There are many reasons for the degradation of MDEA solution, mainly including: [0004] CO 2 The resulting MDEA solution is degraded, and its products mainly include diethanolamine, methylethanolamine, dimethylet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/52B01D53/62B01D53/78B01D53/14
Inventor 朱道平毛松柏
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD