Natural gas drying and sweetening
Why use Siliporite® molecular sieves?
Natural gas is extracted and pre-treated under wet conditions. It must be dried in order to avoid the formation of hydrates and to protect the equipment (compressors, pipelines, cryogenic exchangers, etc). The adsorption of water, in particular on molecular sieves, is the most efficient process; which makes it possible to obtain extreme dew points.
Natural gas must also be purified from many acid and sulfur compounds (CO2, H2S, mercaptans, etc). Here again, our Siliporite® adsorbents offer all the possibilities of selective treatments aimed at meeting the most demanding specifications.
Siliporite® molecular sieves features
All commercial pore sizes (3A, 4A, 5A and 13X) will address the different types of impurities, such as H2S, mercaptans, hydrocarbons, methanol, mercury, chlorine, acids, etc.
- Beads, pellets and trilobes will address pressure drop and velocity issues
- Combined properties: high kinetics, mechanical and chemical resistance, high adsorption capacity
- High severity specialty grades: acid resistant, amine resistant, COS minimization, etc
- Cost-effective debottlenecking possible with our Optisieve® range, designed to build compact adsorbers
- Packaged offers with other adsorbents: alumina, silica gel and supports such as ceramic balls and grids.
Benefits of using Siliporite® molecular sieves
Natural gas is produced in very wet conditions and must be dried to protect the compression equipment. When liquefied the moisture requirements are even more stringent. Siliporite® molecular sieves are widely used to dry natural gas to very low dew points. We have developed a wide range of molecular sieves to address the diversity of issues encountered in drying natural gas.
- Technical support by molecular sieves experts
- Design and operating conditions
- Loading assistance
- On-site services
- Troubleshooting support
- Unit optimization solutions
- Major references.
Siliporite® expertise support
Arkema has developed a very strong expertise in dehydration and sweetening solutions for the natural gas industry. This expertise is backed by a number of major references throughout the globe.
Our team of experts is dedicated to helping our customers to solve their processing issues, supporting existing units in troubleshooting operating issues, but also optimizing the way the unit is run to maximize performance and minimize costs.
Siliporite® SRA belongs to the 4A type family, and was developed and patented by Arkema for the drying of natural and associated gases under difficult operating conditions. It was especially developed for amine resistance and COS minimization. This grade has higher adsorption capacity and kinetics than a standard 4A sieve. It has a high bulk density enabling a higher adsorption capacity by volume. With this grade, very low dew points can be achieved to meet the specification for LNG production.
Siliporite® NK30 COS is a 3A type molecular sieve grade for NG and NGL drying with COS minimization. This grade maximizes water adsorption, while minimizing co-adsorption of H2S and mercaptans. It offers good resistance and low catalytic activity (minimizing coke formation). Siliporite® SRC is also a 3A type molecular sieve. It is a high density product for NG/NGL drying with COS minimization. SRC outperforms the other 3A products for unsaturated natural gas drying when methanol is present.
Sour gas fields, due to their high content of H2S, CO2 and other sulfur compounds, are difficult to treat with conventional molecular sieves, which are destroyed by the acidity of the field. We have developed Siliporite® RA to address this issue. Siliporite® RA provides excellent longevity compared to 3A and 4A, which do not perform well under thermal regeneration with acid gas due to their degradation. An additional benefit of Siliporite® RA is its COS minimization properties.