The Sulaway® unit

The Sulaway® unit is the heart of the Gazpack installation and is a patented process. The saturated, raw (bio) gas is inserted directly into the Gas Purifier. Via a pressurized process, using our patented Sulabeads® the raw biogas is converted into three different outgoing flows.

Gazpack Sulaway Unit
Gazpack Sulaway Unit

Gas vs. Electricity

1: Clean gas

The system is selective in the removal of sulfur (H2S) and reduces the percentage to a level of less than 3,5 ppmV, thus producing a green gas stream which is ready to be used, for example to generate heat in green houses or in an industrial process of a factory. Moreover, we can clean the green gas until it complies with the required Wobbe index (44-55 mJ/Nm3) which makes it possible to add to the natural gas network.

2: H2S gas

The Gas Purifier also produces a gas stream, which is highly saturated with sulfur (H2S). This gas stream is harnessed and burned off in the quencher. Extinguishing the resulting flame arc creates a sulfuric acid that is useful for a variety of applications including purifying ammonium-saturated air. The quenching heat can be used for the heating of offices, but also for digesting processes.

3: Sulphuric Acid

The third stream that comes out of the Gas Purifier is water. This water is used to extinguish the fire arc within the quencher and make sulfuric acid. The essence of the Gazpack system is that it is a closed loop system that produces a limited amount of waste compared to other gas cleaning systems. Waste disposal, especially when saturated with sulfur, is costly and environmentally unfriendly. The sulfuric acid can be used for a variety of applications such as battery acid.


The Sulaway® unit is built according to the highest quality and safety standards in the industry. The main features of the package are explained below.

Safety instruments

All pressure-regulated instruments are pneumatically controlled. In case of alarm or shutdown, the installation will automatically stop and all instruments will turn to their safe positions.

Gas enclosure

The unit is completely enclosed by a gas tight enclosure. In case of an emergency or gas leak the installation is stopped and a process is started to burn off excess gas in the system through an incinerator, which is part of the quencher. There is always a backup supply of nitrogen in order to have a safe shutdown.

Energy usage

Several high power components are used inside the Sulaway® system. Nevertheless, the complete energy balance is well thought out. For example; heat generated by the compressor is used for the regeneration of the Sulabeads®. Additionally, the water collected from the saturated gas is used in the quenching process; only a small amount of additional water might be required.

Standby safety purge system

For purging of the Sulaway® unit, inflammable Carbon Dioxide can be used. The Carbon Dioxide can be filtered out of the green gas by means of membranes which can be added as an additional part of the package.


AirFacts Magazine