1results about How to "Improve oxygen purity" patented technology

This invention discloses a method for producing high-purity oxygen based on LNG cold energy, belonging to the technical field of gas purification equipment. The implementation steps include: S1, pre-cooling and stepped heat exchange of raw air; S2, distillation separation process using LNG cold energy; S3, oxygen purification and argon separation; S4, cold energy recycling. This invention can improve the purity of oxygen, making the molar purity of oxygen above 99.9%, and rationally utilize LNG cold energy to liquefy raw air, reducing air separation costs. In addition, by coupling a crude argon tower, argon with a molar fraction of 7.4% can be produced for the utilization of rare gases.