A kind of preparation method of ultrapure hydrogen

Abstract

The invention discloses a method for preparing ultra-pure hydrogen. The electrolytic hydrogen production process is adopted in the method. Softened water before electrolysis is pretreated, the softened water is heated, and various sorts of gases like N2 and Ar dissolved in the softened water are removed completely; high-purity oxygen is supplied for pressure maintaining; and then the ultra-pure hydrogen meeting 'GBT 3634.2-2011 pure hydrogen, high-purity hydrogen and ultra-pure hydrogen' requirements can be produced by the adoption of the catalyst catalytic deoxidation and molecular sieve dehydration process, filtering dust removal process and steel cylinder drying treatment process. The method for preparing the ultra-pure hydrogen has the beneficial effects that the defects that a palladium alloy diffusion film (pipe) separation method is high in cost and small in production amount, a hydrogen storage alloy absorbing and desorbing method is short in hydride service life and instable in production, a low-temperature adsorption method needs to use liquid nitrogen and thus the requirements for equipment are high are overcome successfully; and the characteristics of being low in production energy consumption, high in flow-path efficiency, simple in process, stable in production and the like are achieved.

Description

technical field [0001] The invention relates to a method for preparing hydrogen, in particular to a method for preparing ultra-pure hydrogen. Background technique [0002] With the development of science and technology, the quality and technical requirements for hydrogen are getting higher and higher, and ultra-pure hydrogen with a purity of 99.9999% is required. Ultra-pure hydrogen has a wide range of applications. It is an important raw material for modern electronics, optical fibers, petrochemicals, and some cutting-edge technologies; It is an indispensable source of high-purity gas for the development and production of semiconductor integrated circuits and optical fibers, integrated optics and nano research, crystal epitaxial growth, etc. , rocket fuel analysis and other fields to carry out an important guarantee for the work. [0003] At present, there are three production methods at home and abroad, namely: [0004] 1. Palladium alloy diffusion membrane (tube) separ...

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Problems solved by technology

These inventions have been innovated on the basis of the original technology, and can produce ultra-pure hydrogen that meets the national standard, but there are still problems of complicated process, large investment and high cost.

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