Hydrogen cyanide

Guichon manufactures valves specially adapted to the production of Hydrogen cyanide :

Check valve & Sight glasses & Strainers, Ball and plug valve, Globe valve, Tank bottom valve, Gate valve, Butterfly valve

Swing check valve
Type : 902

DN 1/2" to 24" Class 150 to 2500 Lbs

– Stainless and duplex steels, nickel alloys, special alloys (titanium, zirconium)

Sight glass
Type : 803

DN 1/2" to 8" Class 150 to 300 Lbs
– End connections : solid or screwed-on flanges
– Stainless steels or alloys

Ball valve
Type : 302N

DN 3/4"/1"1/2 Class 300 Lbs
– Reduced bore
– Titanium T40


  • Construction materials: Carbon Steel (CS), Stainless Steel (SS), Duplex & Super Duplex, Titanium, Zirconium, Uranus® B6, Tantalum, Nickel, Hastelloy®, Monel
  • Construction methods: Fabricated (Welded), Cast, Solid


  • Service conditions: High pressure, High temperature, Low temperature, Abrasion, Corrosion, High viscosity, Vacuum, Reliability, Low acoustic signature, Dead space free
  • Types of fluids: Liquids, Liquids with solid particles, Gas, Powder and powdery media, High viscosity fluids

FAQ - Hydrogen cyanide - HCN

Hydrogen cyanide – HCN – Uses of Hydrogen cyanide :

Hydrocyanic acid is mainly used for the manufacture of products such as acrylonitrile, adiponitrile, cyanogen chloride, cyanuric chloride, acrylates and methacrylates, cyanide, ferrocyanide, chelating agents (EDTA, ….). It is also used as an insecticide and rodenticide, usually by fumigation.

Posted in: FAQ - Hydrogen cyanide - HCN

Hydrogen cyanide – HCN – Manufacturing process for Hydrogen cyanide :

Hydrogen cyanide (HCN) is an important chemical with over a million tons produced globally each year. The watery liquid or gas is used in a variety of syntheses including the production of adiponitrile (for nylon), methyl methacrylate, sodium cyanide and chelating agents. Most hydrogen cyanide is consumed at its production site, forming other higher-value products.

The method which has proved successful for HCN manufacture is based on that described by Andrussow in 1930 which employs methane, ammonia and air at high temperatures (1100-1200°C). Apart from the greater complexity of the recovery arrangements, the operating characteristics of the processes that are being used today are closely similar to those established by Andrussow.

The various modifications of the process differ in their sources of methane, in the proportions of reacting gases, in the nature of the platinum metal catalyst, and in the means of collecting and purifying the product, and recovering or recycling the excess ammonia. Commonly, unreacted ammonia is removed by washing with sulfuric acid. Hydrogen cyanide is then obtained as an aqueous solution by washing with water and followed by distillation and condensation. These steps are represented in figure 1

Figure 1. Flow diagram of the process for the catalytic synthesis of hydrogen cyanide from methane, ammonia and air.

Posted in: FAQ - Hydrogen cyanide - HCN

Hydrogen cyanide – HCN – Recommended valves :

depending on temperature and concentration, the valves must be made with a compatible material such as Hastelloy C (276) 316 SS.

Posted in: FAQ - Hydrogen cyanide - HCN