Sulfuric acid

Guichon manufactures valves specially adapted to the production of Sulfuric acid :

Check valve & Sight glasses & Strainers, Ball and plug valve, Globe valve, Tank bottom valve, Gate 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 - Sulfuric acid

Sulfuric acid – Uses of Sulfuric acid :

– Manufacture of phosphoric acid and fertilizers
– Raw material for the manufacture of many chemicals (alcohol, mineral sulfates, detergents, …)
– Petroleum, textile, paper and pulp industry, pharmaceutical industry
– Treatment of metals – Batteries …

Posted in: FAQ - Sulfuric acid

Sulfuric acid – Manufacturing process of Sulfuric acid :

Sulfuric acid is the largest-volume industrial chemical produced in the world (200 million tons per year). Concentrated sulfuric acid (93-98 %) is used in the manufacture of fertilizers, explosives, dyes, and petroleum products.

The starting material for sulfuric acid manufacture is clean, dry sulfur dioxide (SO2) gas. This can be obtained by burning molten sulfur, from metallurgical off-gases or by decomposing spent sulfuric acid.
Over the last decades the contact process has been used to produce sulfuric acid, replacing the traditional «Lead Chamber» process dating back to the 18th Century.

In the contact process SO2 is oxidized to sulfur trioxide (SO3) at high temperature (about 450°C) in the presence of a vanadium catalyst. SO3 then is dissolved in concentrated sulfuric acid forming fuming sulfuric acid (oleum). This can then be reacted safely with water to produce concentrated sulfuric acid.

Major changes have been made in process and plant design to maximize energy recovery and then use this heat to generate high-pressure steam and/or electricity. The older «single absorption» process has been largely replaced by the «double absorption» process which increases yield of acid and reduces emissions. A typical flowchart for a double absorption sulfuric acid plant is shown in figure 1.

Example of sufuric acid process

Figgure 1. Example of schematic sulfuric acid process

Posted in: FAQ - Sulfuric acid

Sulfuric acid – Recommended valves :

Depending on the temperature range and the concentration of the acid, common used compatible materials for the valves are Alloy 276, Alloy 20, Hastelloy B-3 and Tantaline

Posted in: FAQ - Sulfuric acid