Joint production method and production device of dilute nitric acid and concentrated nitric acid
A joint production and concentrated nitric acid technology, which is applied in the direction of nitric acid, nitrogen oxides/oxygen acid, etc., can solve the problems of equipment manufacturing, maintenance, use, control and safety difficulties, increase operation and maintenance personnel, and increase production and operation costs. Achieve the effect of reducing investment in production equipment, reducing construction area, and reducing production and maintenance personnel
Inactive Publication Date: 2014-03-19
浙江金富春实业有限公司
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Problems solved by technology
Although there is also a method of direct nitration method of direct synthesis by adding oxygen, most people in the industry are unwilling to use this method because it needs to add pure oxygen and react under high pressure, which brings difficulties to the manufacture, maintenance, use, control and safety of the equipment. production method
However, choosing to build a set of dilute nitric acid plant and then build a set of concentrated nitric acid plant can meet the needs of products and safe and stable production, but it will undoubtedly increase investment, increase construction area, increase wastewater discharge, and increase operating and maintenance personnel. production running cost
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[0043] In order to facilitate the understanding of the present invention, the embodiments of the present invention are further described below with reference to the drawings. It should be noted that the present invention cannot be limited to the above conditions due to the specific description of the embodiments. Those skilled in the art can make adjustments to the embodiments of the present invention without difficulty based on the content of this embodiment and their professional knowledge. And obvious changes should be included in the protection scope of the present invention.
[0044] The process flow of the combined production method of dilute nitric acid and concentrated nitric acid is as follows figure 1 As shown, it consists of three steps: oxidation, absorption and distillation.
[0045] Oxidation process.
[0046] The liquid ammonia is sent to the ammonia evaporator 1, and the closed circulating water circulating between the ammonia # evaporator 1 and the middle cooler 32 ...
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A joint production method of dilute nitric acid and concentrated nitric acid comprises the following steps: superazeotropic nitric acid with the mass concentration greater than 68.4% is produced by a dual-pressure dilute nitric acid production device, then concentrated nitric acid with the mass concentration greater than 98% is produced by a superazeotropic nitric acid distillation and rectification technology, and dilute nitric acid with the mass concentration greater than 60% is produced at the same time by matching. According to the production method, ammonia and air are employed to produce concentrated nitric acid, ammonia is oxidized at medium pressure, nitrogen oxides are absorbed at high pressure, the content of NOx in the exhaust gas after absorption is less than and equal to 30ppm after ammonia reduction reaction, the problem of environmental pollution is solved, and dilute nitric acid and concentrated nitric acid in any proportion and any concentration can be simultaneously produced without pure oxygen and any other dehydrating agent.
Description
Technical field [0001] The invention belongs to the technical field of nitric acid production, and relates to a method for jointly producing dilute nitric acid and concentrated nitric acid, and a production device suitable for the method. Background technique [0002] Nitric acid has the remarkable characteristics of a binary constant boiling mixture. Its highest boiling temperature is 121.9°C, and the corresponding concentration is 68.4%. Therefore, nitric acid is divided into dilute nitric acid and concentrated nitric acid. The product with a concentration of less than 68.4% is dilute nitric acid, and the product with a concentration of more than 98% is concentrated nitric acid. The corresponding production methods of dilute nitric acid, concentrated nitric acid and their respective production devices are also used. Due to the constant boiling point of nitric acid, concentrated nitric acid cannot be obtained directly from dilute nitric acid by distillation. Instead, dilute nitr...
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IPC IPC(8): C01B21/40C01B21/44
Inventor 王全文朱效荣方卫胡强郑明飞
Owner 浙江金富春实业有限公司