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The technical upgrade project for 8% dilute nitric acid at Henan Jin Kai Group is basically completed. Author/Source: Henan Jin Kai Group. Date: 2022-03-14. Clicks: 5. After more than a month of installation and testing, the technical upgrade project for 68% dilute nitric acid, led by the group company’s Quality Management Department, has been largely completed and trial sales have begun. To adapt to market changes, the group company adheres to a profit-oriented approach, aiming at \"improving quality, increasing efficiency, and reducing costs.\" It continuously expands its product portfolio and has successfully produced 68% dilute nitric acid using the concentration distillation method. To further reduce production costs, the company boldly proposed using a mixture of 60% dilute nitric acid and 98% concentrated nitric acid in a certain ratio. However, preliminary comparative tests revealed that the resulting product had issues such as high levels of nitrite, a yellowish color, and uneven mixing. To address this technical challenge, the Quality Management Department of the group company held several special meetings with the Production Department and the Nitric Acid Workshop of the Second Branch Company for discussion. Based on on-site inspections, it was decided to add a DN400 flash tank on top of the 60% dilute nitric acid tank. The 68% dilute nitric acid produced as a result of mixing is pumped into this flash tank where its pressure is reduced, allowing NO2 to be separated out. This gas is then washed and absorbed using a jet pump, which helps to improve the uniformity of the mixture and reduce the nitrite content, thereby achieving the goal of decolorization. According to statistics, 68% of the dilute nitric acid produced by this method requires 50 kWh less energy per ton compared to the previous method, with steam consumption reduced by 0.58 tons. It is estimated that this will save the company 4.9 million yuan in costs throughout the year, thereby achieving the goal of improving quality and efficiency.