A production of stable isotopes 15 n's full cycle, double feed energy saving system

Abstract

The invention relates to a complete-cycle double-way-feeding energy-saving system for producing a stable isotope <15>N. The system consists of n cascaded exchange towers, wherein each exchange tower consists of a bottom reflux tower assembly, an exchange tower assembly and a top reflux tower assembly, the exchange towers are connected with one another through pipelines to form a horizontal cascading device, and materials are fed from the tops and the middles of the exchange towers respectively. According to the system, nitric oxide (NOx) is generated during a chemical reaction in the reflux tower assemblies, rises to enter the exchange tower assemblies and generates a nitrogen isotope chemical exchange reaction on the surfaces of fillers in the exchange tower assemblies, so that the abundance of <15>N in nitric acid is increased, the concentration of <15>N in a gas phase is continuously decreased, and a high-abundance <15>N product is obtained after the circulating refluxing. Compared with the prior art, the system has the advantages that the usage of a raw material, namely nitric acid, is greatly reduced at a same production scale, the use ratio of the raw material is increased, the emission of waste is reduced, and the production cost is lowered.

Description

technical field [0001] The present invention belongs to high abundance 15 The technical field of N production, especially one that involves the production of stable isotopes 15 N full cycle, double feed energy saving system. Background technique [0002] In natural nitrogen-containing substances, nitrogen is mainly in the form of stable isotopes 14 N and 15 N exists in two forms, where 14 N and 15 The natural abundances of N are 99.635% and 0.365% respectively. In terms of atomic structure, they have the same number of electrons outside the nucleus. 15 N is only 14 N has one more neutron. Since nitrogen is the main constituent element of organic life, and 15 N has stable physical and chemical properties. With the continuous development of science and technology, it can be widely used as a tracer atom in the fields of medicine, pharmacology, biochemistry and life science, and has important economic and social benefits. [0003] Due to the small vapor pressure differe...

AI Technical Summary

Problems solved by technology

A large amount of nitrogen oxide gas NO is discharged from the top of the prior art production device x , belongs to toxic and harmful substances, destroys the ozone layer, and cannot be directly discharged into the atmosphere; it needs to establish a huge device for recycling, and the production cost is high. It is usually absorbed and converted into nitric acid for sale. The waste acid has a large amount of treatment and is not energy-saving enough.

[0007] (2) The utilization rate of raw material nitric acid is low and the production cost is high

Since the separation coefficient between nitrogen isotopic components at normal temperature and pressure is 1.055, if 15 N isotopes are enriched from the natural abundance of 0.365% to more than 99%, and the utilization rate of raw nitric acid is not greater than (1.055-1) / 1.055=5.21%, so a large amount of raw nitric acid is consumed, resulting in waste of raw materials and extremely high production costs

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