Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    Lean Amine Liquid Pump

    Publication Date:

    2025-09-05

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    In the chemical industry, particularly in the coal chemical sector, lean amine pumps are frequently used—some customers even refer to them as lean liquid pumps, amine water pumps, amine solution pumps, MDEA pumps, or decarbonization pumps, among other names. When purchasing this type of pump, customers often find themselves unsure about which model to choose. In this article, Changsha Zhonglian Pump Industry will leverage its extensive engineering experience to provide you with comprehensive insights into how to select the right lean amine pump for your needs.

    We can first take a look at what "lean liquid" actually is. After our inquisitive editor from Changsha Zhonglian Pump Industry consulted extensively with sales managers who have extensive experience in selling lean liquid pumps, we’ve gained a clearer understanding. In the pump industry, the lean liquid pumps we encounter most frequently are primarily used in the chemical sector. Specifically, they handle the ethanolamine aqueous solution—rich in hydrogen sulfide—that’s sprayed at the top of the desulfurization tower during gas desulfurization or decarbonization processes. This solution is also referred to as "rich amine liquid." In contrast, the corresponding "lean amine liquid" refers to the amine component collected at the bottom of the regeneration tower, which contains significantly lower levels of hydrogen sulfide, hence the term "lean amine liquid," or simply "lean liquid." In English, this is abbreviated as MDEA. The pump designed to convey, boost, or circulate this lean amine liquid is known as either a "lean liquid pump" or a "lean amine liquid pump"—though some also call it an "amine water pump." It’s important to note here that "amine water" should not be confused with "ammonia water," even though their pronunciations sound identical. While both types of pumps may indeed operate on the same basic principle, there can still be subtle differences depending on the specific application. Centrifugal pump 。

    Please click the image to learn more about the product details and technical specifications of Changsha Zoomlion Pump Industry's [DFP Series Self-Adjusting Multistage Centrifugal Pump].

    The lean liquid pump is clearly an operational term. Currently, four common pump types are widely used for lean liquid pumps. Depending on the specific parameter requirements of the user, multistage centrifugal pumps, submersible pumps, and pipeline pumps are typically selected to carry out the desulfurization or decarbonization processes in the entire amine solution regeneration unit. Based on the particular stage of the process they serve, multistage centrifugal pumps and submersible pumps are both employed to boost the flow of lean liquid, while pipeline pumps are used for reflux purposes. All three types of pumps must be made from corrosion-resistant materials. Since the lean liquid isn’t highly corrosive, 304 stainless steel is usually chosen as the material for manufacturing these pumps. Additionally, for safety reasons, explosion-proof motors are often installed to drive the lean liquid pumps. Below, we’ll introduce each of these three commonly used lean liquid pump types in detail.

    I. Multistage Centrifugal Pump

    The lean amine solution pump is somewhat corrosive, so a corrosion-resistant centrifugal pump must be used. When the head requirement isn't high, choose IH-Type Stainless Steel Single-Stage Centrifugal Pump When the head exceeds 150 meters, a specialized model should be selected. DF-Type Corrosion-Resistant Multistage Centrifugal Pump , or DFP-Type Self-Balanced Multistage Centrifugal Pump , these two pumps are specifically designed for the chemical industry. Multistage Centrifugal Pump Made from 304 stainless steel, this product typically features a集装式 mechanical seal for effective leak prevention. It’s important to note that the temperature of the lean liquid can sometimes reach up to 100°C. While the 6.3 MPa pressure-rated flange is normally designed to handle such conditions at ambient temperatures, its pressure-bearing capacity significantly decreases once the temperature climbs to 100°C—dropping to just under 5 MPa. Therefore, if your pump head exceeds 500 meters, you’ll need to opt for an outlet flange with a higher pressure rating.

    Please click the image to learn more about the product details and technical specifications of Changsha Zhonglian Pump Industry's [DF Series Corrosion-Resistant Multistage Chemical Centrifugal Pump].

    II. Submersible Pump

    The lean amine liquid pump also utilizes a submersible pump, which typically features corrosion-resistant materials as well. FY-Type Submersible Chemical Pump This type of pump is directly installed on the container holding the medium being conveyed, requiring no additional floor space and thus reducing capital investment. Additionally, it eliminates the need for mechanical seals, avoiding the frequent maintenance costs associated with liquid-submerged pumps that rely on mechanically sealed components prone to wear. As a result, this is an extremely cost-effective lean-liquid pump.

    Please click the image to learn more about the product details and technical specifications of Changsha Zoomlion Pump Industry's [FY Series Submersible Chemical Pump].

    III. Pipeline Pumps

              The pipeline pump is a common type of centrifugal pump, primarily used in the reflux process within lean amine liquid pumps. It requires an IHGB-type explosion-proof model made from stainless steel. Corrosion-resistant pipeline pump , this pump type is ISG-Type Pipeline Pump The derived pump model features a stainless steel pump casing and wetted parts, paired with an explosion-proof motor. It boasts advantages such as simple construction, convenient maintenance, long service life, and a wide range of applications—making it virtually one of the essential pump types for industries across the board.

    Please click the image to learn more about the product details and technical specifications of Changsha Zhonglian Pump Industry's [IHG Series Corrosion-Resistant Pipeline Pumps].

    Here's the detailed and specific answer—summarized by this editor—regarding what type of pump a lean liquid pump falls under. We believe that after reading this article, you’ll clearly understand which pump is best suited for your lean liquid application. If you have any further questions, feel free to reach out to Zhonglian Pump Industry’s online customer service team or give us a call at 0731-8819288. Our company boasts extensive experience in lean liquid pump projects, enabling us to provide you with the most appropriate products and technical support.

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