膜蒸-结晶,以实现可持续的碳利用和储存
Kofi S S Christie1,2, Allyson McGaughey1,3, Samantha A McBride4
1Andlinger Center for Energy and the Environment, Princeton University, Princeton, New Jersey 08544, United States.
Environmental science & technology
|October 19, 2023
概括
本研究介绍了膜蒸结晶,用于从含有二氧化碳的氨基溶液和废物中生产碳酸盐矿物质. 这种方法提供了一种可持续的碳捕获和利用方法,将废物转化为有价值的产品.
科学领域:
- 环境工程 环境工程
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 燃烧后的二氧化碳捕获对于减轻发电厂的温室气体排放至关重要.
- 目前使用氨基基溶剂的方法在可持续的二氧化碳利用和储存方面存在局限性.
- 开发有效的过程来将捕获的二氧化碳转化为稳定的矿物形式是必不可少的.
研究的目的:
- 研究用于可控制的碳酸盐矿产生产的膜蒸结晶 (MD-结晶).
- 在碳矿化过程中利用飞灰和淡化盐水等废弃物.
- 优化MD结晶条件,以提高碳矿化效率和矿产产品质量.
主要方法:
- 使用不同的膜类型和操作条件的膜蒸-结晶.
- 使用带有二氧化碳的单乙胺溶液 (30%重量),含有5-15%的二氧化碳.
- 用Ca2+和Mg2+ (0.18M) 的剂量料溶液,并包含废物 (飞,盐水).
- 分析膜表面能量,粗度,工作温度和系统配置对矿物化的影响.
主要成果:
- 表面能量较低,粗度较高的膜加速了矿化,蒸汽流量增加了高达20%.
- 较低的工作温度提高了96.2%的膜湿耐受性,但降低了48.3%的晶体生长率.
- 扫除气膜蒸将矿化率降低了71.6%,同时稍微提高了湿度 (37.5%).
- 识别了过程中产生的特定矿物质特征和生长特征.
结论:
- 通过矿产生产,MD结晶为同时利用和储存二氧化碳提供了一条可行的途径.
- 优化膜特性和操作参数是最大限度地提高矿化效率和产品质量的关键.
- 废物材料的整合为碳矿化提供了一个可持续的途径,为循环经济做出了贡献.
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