Specialty Gases

Definition

High-purity hydrogen refers to hydrogen gas that has been refined to extremely high purity levels, typically 99.999% or higher. At standard temperature and pressure, high-purity hydrogen is a colorless, odorless, and tasteless gas with a very low density and is poorly soluble in water.

 

Applications of High-Purity Hydrogen

• Electronics Industry

High-purity hydrogen is a crucial raw material in the electronics industry, widely used in semiconductor manufacturing, integrated circuit production, and fiber optic preform manufacturing. For example:

In the semiconductor industry, high-purity hydrogen is used to formulate SiH₄/H₂ mixtures as carrier gases in chemical vapor deposition (CVD) processes.

In fiber optic preform manufacturing, high-purity hydrogen is used in hydrogen-oxygen flame heating, where the purity and cleanliness of hydrogen are extremely important.

In 2023. the electronics and semiconductor industries had the highest consumption of high-purity hydrogen, reaching 144.800 tons.

• Fine Chemicals and Pharmaceutical Intermediates

High-purity hydrogen is a fundamental raw material for the production of fine chemicals and pharmaceutical intermediates. The purity of hydrogen directly affects product quality and energy consumption. For example:

In catalytic hydrogenation processes, the impurity content in hydrogen determines the lifespan of catalysts and the product pass rate, which in turn affects production costs.

In 2023. the consumption of high-purity hydrogen in the fine chemicals and pharmaceutical intermediates industry was 54.200 tons.

• Metallurgical Industry

High-purity hydrogen is used as a reducing agent in the metallurgical industry to reduce metal oxides to pure metals, especially in the production of high-quality metals such as tungsten, titanium, aluminum, steel, nickel, and chromium. In 2023. the consumption of high-purity hydrogen in the metallurgical industry was 36.400 tons.

• Energy Sector

As a clean and efficient energy carrier, high-purity hydrogen has broad application prospects in the energy field. For example:

Fuel Cell Vehicles: High-purity hydrogen is used as fuel in fuel cells, offering high efficiency and low pollution, making it a promising direction for the development of new energy vehicles.

Energy Storage: Hydrogen plays an important role in seasonal energy storage for renewable energy power systems.

 

Research and Experimental Fields

High-purity hydrogen is used as a reference material in scientific research to verify the accuracy and reliability of chemical reactions. It is also an important medium for many physical experiments and materials research.

• Other Fields

High-purity hydrogen is also widely used in petrochemicals, food processing, float glass manufacturing, aerospace, and other fields.

Production Techniques of High-Purity Hydrogen

• Fossil Fuel Reforming

Fossil fuel reforming, including coal gasification and natural gas reforming, is currently the most widely used hydrogen production method in China.

• Industrial Byproduct Hydrogen

Hydrogen is extracted from byproducts of industrial processes such as coke oven gas, chlor-alkali tail gas, and propane dehydrogenation.

• Electrolysis of Water

Electrolysis of water produces hydrogen through the electrolysis of water and is a clean and environmentally friendly method of hydrogen production. Common electrolysis technologies include:

Alkaline Electrolysis: Uses KOH as the electrolyte and nickel-based electrodes, with reaction temperatures of 70-90°C.

Proton Exchange Membrane (PEM) Electrolysis: Uses pure water electrolysis with an efficiency of over 75%.

High-Temperature Solid Oxide Electrolysis (SOEC): Operates at 800-1000°C with an energy conversion efficiency exceeding 85%.

Utilization of Hydrogen-Rich Tail Gas

Hydrogen is extracted from the tail gas of liquefied natural gas (LNG) through a gas separation and purification system, which involves adsorption, multi-stage pressure reduction, forward and reverse flushing, and other steps to produce high-purity hydrogen.

 

Future Development Trends

With the increasing demand for environmental protection and renewable energy, high-purity hydrogen, as a clean and efficient energy carrier, has a broad market prospect. Future development trends in the high-purity hydrogen industry include:

Market Growth: Driven by the development of the hydrogen energy industry and the “dual carbon” goals, the Chinese high-purity hydrogen market will have a broader development space.

Technological Progress: Breakthroughs in electrolysis of water technology will lead to increased efficiency and reduced costs, making green hydrogen production more feasible.

Expanded Applications: The application of high-purity hydrogen in fuel cell vehicles will accelerate, and its use in the metallurgical, chemical, and other industrial fields will gradually expand.

 

In summary, high-purity hydrogen has broad application prospects and great potential in multiple fields. With continuous technological advancements and expanding applications, high-purity hydrogen will play an important role in promoting energy transformation and achieving carbon neutrality goals.