3results 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.

The invention relates to the technical field of hydrogen preparation, in particular to a sulfuric acid phase decomposition process and a sulfuric acid phase decomposition system in SI circulation, the sulfuric acid phase decomposition process comprises a raw reaction, two-phase layering, sulfuric acid purification, sulfuric acid dehydration decomposition and hydrogen iodide decomposition, the purified sulfuric acid is concentrated to 75-90 wt%, the concentrated sulfuric acid reacts with phosphorus pentoxide to generate phosphoric acid and sulfur trioxide, and the sulfur trioxide reacts with phosphorus pentoxide to generate sulfur trioxide; sulfur trioxide is decomposed into sulfur dioxide and oxygen under the conditions of a catalyst and 923K-1023K, meanwhile, in-situ separation of oxygen is carried out by adopting a composite oxygen-permeable ceramic membrane, and sulfur dioxide gas without oxygen is returned and circulated to participate in the raw reaction. Sulfuric acid decomposition of the SI circulating system adopts a mode of matching chemical reaction with the membrane reactor, a step of decomposing sulfuric acid under a high-temperature condition is avoided, sulfur trioxide is prepared through dehydration reaction of phosphorus pentoxide, oxygen is separated in situ by the membrane reactor, the decomposition rate of sulfur trioxide can be increased, the decomposition temperature of sulfur trioxide can be reduced, and the sulfur trioxide can be recycled. The obtained oxygen is high in purity, and a byproduct is phosphoric acid.

The utility model relates to the field of low-temperature rectification oxygen production, in particular to a device for extracting high-purity liquid oxygen from low-temperature rectification liquid oxygen, which comprises a rectification tower I, a main heat exchanger, a rectification tower II, a condenser I, a condenser II, a condenser III, a condenser IV and a condenser V, an extraction opening I is formed in one side of the middle part I and is communicated with an inner cavity of the lower part I through a spraying pipeline; a liquid oxygen condensation outlet of the condenser III is connected with a liquid oxygen inlet of the rectifying tower II through a liquid oxygen conveying pipeline; a high-purity liquid oxygen outlet is formed in one side of the bottom of the second lower portion of the second rectifying tower and connected with the main heat exchanger through a first oxygen conveying pipeline, high-purity liquid oxygen is conveyed to a high-purity liquid oxygen storage tank after heat exchange, and an oxygen outlet is formed in one side of the second upper portion of the second rectifying tower and connected with the main heat exchanger through a second oxygen conveying pipeline. The device is simple in structure and convenient to operate and maintain, and a high-purity oxygen product with the oxygen purity higher than 99.99988% can be obtained through multi-stage rectification treatment.