Supercritical carbon dioxide (scCO₂) is an alternative medium for a drastic reduction of water for the impregnation of synthetic and natural fibers, especially azoic dyes. In this study, we evaluated the impregnation of alpaca fibers with alizarine and indigo dyes in a process with scCO₂, using DMSO as a cosolvent for the dyes. The scCO₂ flow rate ranged from 8 to 17.0 g/min over 90 min through a 1000 mL impregnation autoclave, and the amounts of dye:Al₂(SO₄)₃ loaded were 15%:55% of the fiber weight, respectively. Impregnation was evaluated between 308.15 −363.15 K and 22.40 −13.37 MPa, and the products were characterized by FTIR spectroscopy. The highest impregnation obtained was 142.05 mg alizarine/g fiber at 311.15 K and 17.9 MPa and 260.80 mg indigo/g fiber at 329.15 K and 17.5 MPa. Color fastness analysis revealed that the colored fibers were resistant to water washing in the range of 4–5, a commercially accepted level for the fiber.

超临界二氧化碳 (scCO ₂ ) 是一种替代介质，可大幅减少浸渍合成纤维和天然纤维（尤其是偶氮染料）中的水分。_{在这项研究中，我们评估了在使用 scCO 2 的}过程中用茜素和靛蓝染料浸渍羊驼毛纤维，使用 DMSO 作为染料的助溶剂。scCO ₂流速范围为 8 至 17.0 g/min，通过 1000 mL 浸渍高压釜 90 分钟，染料的量：Al ₂ (SO ₄ ) ₃负载量分别为纤维重量的15%:55%。在 308.15 -363.15 K 和 22.40 -13.37 MPa 之间评估浸渍，并通过 FTIR 光谱表征产品。在 311.15 K 和 17.9 MPa 下获得的最高浸渍量为 142.05 mg 茜素/g 纤维，在 329.15 K 和 17.5 MPa 下为 260.80 mg 靛蓝/g 纤维。色牢度分析表明，彩色纤维的耐水洗性在 4-5 范围内，这是该纤维的商业可接受水平。