A small-scale upgrading solution: SULAGO®

The Sulaway® system is designed to upgrade large-scale amounts of biogas into Renewable Natural Gas (RNG). For smaller capacities, Gazpack introduced the Sulago® system.  

The concept behind Sulago® process is to be able to provide smaller, more compact and affordable Sulago® units for small-scale facilities.

Our Sulaway®, as mentioned earlier, was initially built to convert large capacities of biogas to biomethane (>1500 Nm³/h), while on today’s market, for example, India, there is a high demand for small upgrading capacities. Therefore, Gazpack invented Sulago®, thus we can deliver small-scale upgrading solutions according to customer specifications (<1500Nm³/h). However, Sulago® has an appealing CAPEX; OPEX ratio especially when it comes to capacities between 250 Nm³/h- 600 Nm³/h.

The Sulago® system consists of one water separator, one compressor/dryer set, and two Sulafer® filter towers, all of which are stored in one compact storage system. All systems are equipped with a gas leak alarm for safety measures.

For supply to the grid, we need to know the grid pressure required. The package is built in an enclosure with a ventilation system under pressure to avoid odor that will leave the enclosure. Thus, methane slip will not occur, as our package is built in a gas-tight enclosure.


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How it works

Below you will find the initial steps of the Sulago®  system as follows: 

  • Step 1: Sour gas passes a dryer-cooler with a filter separator to remove liquid water from the gas.
  • Step 2: The gas is entering the first Sulago® tower to absorb the largest portion of H₂S. The second tower takes care of an absorption level of 3 ppmV H₂S.
  • Step 3: The compressor is boosting the pressure up to 8 bar and leads it through two membranes.
  • Step 4:The first membrane removes the largest CO₂ percentage and permeate it with the surplus of air into the atmosphere. The second membrane brings CO₂ load at spec – 3% into the gas stock.

At any given time, only one Sulago® filter tower will be in operation, actively monitored by an H2S sniffer. The other will be on stand-by mode. When the level of H2S collected reaches the pre-set amount an alarm will be triggered sending a message to the controller. The system will then automatically switch over to the second (stand-by) tower. A signal will also be sent to our head office, notifying us that the saturated tower is ready for regeneration. Regenerable adsorbent, Sulafer®, will be collected and regenerated within our own factory. 


In contrast to other systems, which are using active coal, Sulago® is using our own developed Sulafer®. Sulafer® has the capability to regenerate three times without losing the ability to absorb H₂S. However, the cleaning of the absorbent is feasible within our factory. Besides that, Sulafer® has a minimum lifespan of one year, which equals 8000 operating hours. 

Waste Disposal

1. Sulafer® adsorbent will improve your companies green image (with carbon you are left with a dirty adsorbent, which is unfriendly for the environment and unrecyclable. Sulafer® however, can be regenerated and is made of all natural and recyclable materials).

Low costs price

2. Sulafer® has a low costs price and be competitive in comparison to other adsorbent. However, Sulafer® can be regenerated within our own factory, which means it has twice the lifespan than other adsorbent.

High H₂S content

3. Sulafer® has a better absorb capacity and it can handle high H₂S content (>1000 ppmV), which can be regenerated and used again.

Improve your green image

4. The process of the Sulago® and Sulaway® packages is environmentally friendly and sustainable! All outgoing products are reusable and energy consumption is low due to heat recovery.


Methane Slip Whitepaper