Liquid sulfur

Guichon manufactures valves specially adapted to the production of Liquid sulfur :

Sampling valve, Slide valve, Butterfly valve

Sampling valve
Type : 655C

DN 3/4" to 1/2" Class 150 Lbs
– Fully jacketed
Sampling valve
Type : 655M

DN 3/4" x 1/2" Class up to Class 600

– PTFE/glass packing

Parallel seated gate valve
Type : 706

DN 1" to 16" Class 150 à 300 Lbs
– Fabricated (welded) construction
– Stainless and duplex steels, nickel alloys, special alloys


  • 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 – Slurry, Gas, Powder and powdery media, High viscosity fluids

FAQ - Liquid sulfur

Liquid sulfur – Uses of Liquid sulfur :

Sulfur is used for manufacturing sulfuric acid, fertilizers, pesticides and rubber products.

Posted in: FAQ - Liquid sulfur

Liquid sulfur – Manufacturing process of Liquid sulfur :

Today, sulfur is produced from petroleum, natural gas, and related fossil resources, from which it is obtained mainly as gaseous hydrogen sulfide (H2S). In petroleum refineries, gases with an H2S content of over 25% are suitable for recovery of sulfur in Claus plants.

The Claus process (see figure 1) is the most significant gas desulfurizing process, recovering elemental sulfur from gaseous hydrogen sulfide.  This process is divided into two main steps, thermal (in burners above 850°C) and catalytic. The catalytic recovery of sulfur consists of three sub steps:
– Reheating: the gas is reheated and introduced to the catalyst bed.
– Catalytic reaction: the remaining H2S is reacted with SO2 at lower temperatures (about 200-350°C) over a catalyst to make more sulfur. The reaction does not go to completion even with the best catalyst. For this reason two or three reactors are used.
– Cooling and condensation: In the sulfur condensers, the process gas coming from the burner and from the catalytic reactors is cooled to between 150 and 130°C, sulfur being removed between each stage.

Figure 1. Schematic flow diagram of a straight-through, 3-reactor Claus sulfur recovery unit

Figure 1. Schematic flow diagram of a straight-through, 3-reactor Claus sulfur recovery unit

Over the years many improvements have been made to the Claus process in order to adapt it to different feed gas compositions (e.g. high content of CO2 or ammonia) and in order to improve its effectiveness (conversion, energy balance, installation cost). Most sulfur recovery plants utilize one of three basic variations of the Claus process «straight-through», «split-flow» or «direct-oxidation».

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Liquid sulfur – Recommended valves :

This process shows to be very aggressive for the valves which have to be generally in alloy materials.

Posted in: FAQ - Liquid sulfur