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持続可能な炭素回収・利用における有望な吸収溶媒としての海水

Seawater as a promising absorption solvent in sustainable carbon capture and utilization (原題)

Seung-Min Cheon, Su-Min Kwon, Chae-Eun Lee, Sun-Jin Hwang

Energy & Environment📚 査読済 / ジャーナル2026-09-01#CCUS経営インパクト: コスト削減対象セクター: chemical
DOI: 10.1177/0958305x261484391
原典: https://doi.org/10.1177/0958305x261484391

🤖 gxceed AI 要約

日本語

沿岸工業団地でのCO2回収・利用（CCU）に特化し、淡水の代替として海水を用いるSeawater-Based Carbon Capture（SBCC）システムを提案。pH緩衝機構により淡水溶媒と比較して総炭素回収量を54〜86%向上させ、NaOH消費量の増加はあるものの、正味炭素回収量（NCC）も54〜84%増加。海水の吸収容量は淡水比6%未満の低下に留まり、副生するMgCO3やCaCO3を高価値資源として活用できる点も示した。

English

This study proposes a Seawater-Based Carbon Capture (SBCC) system for coastal industrial complexes, substituting freshwater with seawater as a solvent. Leveraging pH-buffering mechanisms, SBCC achieved a 54–86% increase in total carbon capture and a 54–84% increase in net carbon capture (NCC) relative to freshwater, with only a marginal (<6%) reduction in absorption capacity per unit NaOH. The carbonate precipitates (MgCO3, CaCO3) can be valorized as high-value resources, offering a sustainable alternative for CCU.

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本の沿岸部に立地する鉄鋼・化学・石油化学などの産業集積地では、CCUS導入が急務であり、海水利用は淡水資源の制約を回避しつつCO2回収を可能にする点で有望。将来的にSSBJやカーボンプライシングに対応するための排出削減技術として、産業界の実装検討に資する。

In the global GX context

Globally, CCUS is critical for hard-to-abate sectors, and this study offers a novel approach to reduce freshwater dependency in carbon capture, particularly relevant for coastal industrial hubs. The findings support the feasibility of seawater-based capture, potentially lowering operational costs and environmental impacts, aligning with international climate goals and transition finance criteria.

👥 読者別の含意

🔬研究者:Provides experimental evidence on seawater as a viable solvent, highlighting pH-buffering effects and trade-offs, useful for CCUS process optimization.

🏢実務担当者:Offers a potential low-cost, sustainable alternative for coastal CCU facilities, reducing freshwater use and creating value from mineral byproducts.

🏛政策担当者:Supports policies promoting CCUS in coastal industrial zones, addressing water scarcity and decarbonization simultaneously.

📄 Abstract（原文）

Given that geographic proximity between CO 2 sources and carbon capture and utilization (CCU) facilities minimizes transportation costs, developing specialized CCU technologies for coastal industrial complexes is imperative. Current wet carbon capture relies on freshwater; however, increasing scarcity necessitates sustainable alternatives. This study addresses this challenge by proposing a Seawater-Based Carbon Capture (SBCC) system that utilizes seawater as a promising solvent. While the SBCC process leveraged pH-buffering mechanisms to achieve a 54–86% increase in total carbon capture relative to freshwater solvents, it necessitated a proportional rise in NaOH consumption. Previous studies have primarily attributed the lower CO 2 absorption capacity of seawater to excessive OH − consumption during Mg(OH) 2 precipitation; in contrast, the proposed SBCC process achieved a substantial increase in net carbon capture (NCC) by 54–84%. Regarding the absorption capacity per unit of NaOH, seawater exhibited a marginal reduction of less than 6% compared to freshwater, despite the formation of carbonate precipitates such as MgCO 3 and CaCO 3 . Notably, this slight efficiency tradeoff is considered manageable and can be further offset by the valorization of these mineral precipitates as high-value resources. This study addresses the need for sustainable alternatives by proposing an SBCC system utilizing seawater as a promising solvent. These results validate that substituting freshwater with seawater can significantly enhance NCC by maximizing pH-buffering effects within the pH-buffer zone created by alkaline absorbent dosage at the Primary pH-control zone.

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