Methyldiethanolamine (MDEA) is a type of alcohol amine substance with relatively good performance, widely used for desulfurization and decarbonization of gases. MDEA is a tertiary amine that exhibits weak alkalinity in water. The product formed after absorbing CO₂ requires lower heat duty for thermal regeneration, and the regeneration temperature is relatively low. MDEA has a low vapor partial pressure, resulting in less entrainment loss in purified gas and regeneration gas, and minimal solution loss in the overall process. MDEA has stable performance and is essentially non-corrosive to carbon steel equipment. It is suitable for CO₂ removal from medium- and high-pressure mixed gases, and is particularly applicable to the petrochemical and natural gas industries.
Process Features
• This solution combines the characteristics of both physical absorption and chemical absorption, and the solvent has a high capacity for carbon dioxide absorption.
• MDEA itself has a low vapor partial pressure and very low volatility.
• The heat of solution of carbon dioxide in this decarbonization solution is low, which can achieve the purpose of reducing water, electricity, and steam consumption in the decarbonization process.
• The solution has good stability, with degradation rarely occurring during use. It is virtually non-corrosive to carbon steel equipment. A washing section is installed after the regeneration tower to reduce MDEA solution loss.
• High recovery rate of active components (≥99.5%), and high carbon dioxide removal precision (can reach <20 PPm).
• The MDEA decarbonization process can also remove hydrogen sulfide and organic sulfur while absorbing CO₂.
• The by-product carbon dioxide has a high recovery rate and high purity (≥99.7%). After simple post-treatment, it can meet food-grade standards.
• According to user operating conditions, process flow combinations such as single-stage absorption with single-stage regeneration, or two-stage absorption with two-stage regeneration, can be adopted to minimize investment and energy consumption.
Applicable Fields
Gas decarbonization in the petrochemical, natural gas, and chemical industries.
