Carbon capture and utilization projects involve the collection, refining, and purification of low-, medium-, and high-concentration CO₂ from various industrial exhaust gases to achieve high purity (meeting industrial, food-grade, and electronic-grade standards). Distillation is an essential process for obtaining high-purity CO₂. For CO₂, impurities include light components with boiling points lower than CO₂, such as H₂, N₂, O₂, CO, and CH₄. Heavy components with boiling points higher than CO₂ include alcohols, aldehydes, heavy hydrocarbons, benzene, and vinyl chloride. Existing technologies primarily use physical adsorption with adsorbents to remove heavy components, followed by distillation to remove light component impurities. The removal of heavy components requires a large amount of adsorbent. Furthermore, due to the variety of impurities involved, this approach suffers from drawbacks such as the need for numerous types of adsorbents, a large volume of solid waste to be treated, and high costs.
As early as 2005, our company developed a dual-tower distillation technology. By leveraging the differing volatilities of the components in the mixture, this process transfers light components (low-boiling substances) from the liquid phase to the gas phase, thereby removing light-component impurities. Meanwhile, the heavy components (high-boiling substances) in the CO₂ vapor phase are transferred to the liquid phase and discharged from the tower bottom, thereby separating the heavy-component impurities. The CO₂ product purified using this technology can achieve a purity of over 99.99%; however, meeting food-grade quality standards depends on the purification status of the specific feed gas. For example, if impurities of C₂ or higher cannot be removed through Double Column Distillation, the product will only meet high-quality industrial standards; conversely, if the feed gas contains few or no impurities of C₂ or higher, the product can generally meet food-grade quality standards.
Our company’s double-tower distillation technology has been deployed in numerous CO₂ facilities, including those at Ningxia DeDa, Liuguo Chemical, Anhui Jinhe, Shandong Shenchi Chemical, and Shandong Luqing Petrochemical.
The dual-tower distillation process is simple: it requires no regeneration or replacement of adsorbents, no external heat source, and produces no solid waste, making it one of the most efficient, energy-saving, and environmentally friendly CO₂ recovery technologies available.
This technology is a patented and proprietary technology of Hangzhou Kuai Kai. Infringement will be prosecuted.
