What is Rectisol process?
Rectisol®, independently developed by Linde and Lurgi, is a physical acid gas removal process using an organic solvent (typically methanol) at subzero temperatures, and characteristic of physical acid gas removal (AGR) processes, it can purify synthesis gas down to 0.1 ppm total sulfur, including hydrogen sulfide (H2S) …
What is the purpose of the Rectisol process?
Rectisol is used most often to treat synthesis gas (primarily hydrogen and carbon monoxide) produced by gasification of coal or heavy hydrocarbons, as the methanol solvent is well able to remove trace contaminants such as ammonia, mercury, and hydrogen cyanide usually found in these gases.
What is Selexol used for?
Absorption Capture Systems The Selexol process uses a liquid physical solvent to remove acid gas from synthetic or natural gas streams and has been in commercial application since the early 1970s, with well over 50 units currently operating worldwide.
What is syngas hydrogen?
Syngas, or synthesis gas, is a fuel gas mixture consisting primarily of hydrogen, carbon monoxide, and very often some carbon dioxide. The name comes from its use as intermediates in creating synthetic natural gas (SNG) and for producing ammonia or methanol.
What is Benfield solution?
The Benfield process can be tailored for either bulk or trace acid gas removal in natural gas treating to achieve pipeline specifications. It is a thermally-regenerated, cyclical solvent process that uses an activated, inhibited hot potassium carbonate solution to remove CO2, H2S and other acid gas components.
What is used for syngas purification?
Rectisol™ is a physical washing process and involves the use of a solvent to remove acid gases from raw syngas.
What is a Selexol unit?
Selexol is the trade name for an acid gas removal solvent that can separate acid gases such as hydrogen sulfide and carbon dioxide from feed gas streams such as synthesis gas produced by gasification of coal, coke, or heavy hydrocarbon oils.
What is the difference between biogas and syngas?
If lignocellulosic biomass is used as raw material, biogas is more commonly used for cogeneration purposes than syngas. However, syngas from biomass gasification has a great potential to be employed as a chemical platform in the production of value-added products.
What is known as syngas?
Synthesis gas (also known as syngas) is a mixture of carbon monoxide (CO) and hydrogen (H2) that is used as a fuel gas but is produced from a wide range of carbonaceous feedstocks and is used to produce a wide range of chemicals.
What is a Benfield?
How do you remove potassium carbonate?
Try to extract your product in organic solvent like diethyl ether or methylene chloride. By this, you will remove the potassium carbonate, and then you can perform column chromatography after you found best eluent by TLC of the crude.
Commercial scale Rectisol® units are operated world-wide for the purification of hydrogen, production of ammonia, production of syngas for methanol synthesis, and the production of pure carbon monoxide and oxogases. Due to the physical nature of the process, high pressure and high sour gas concentrations are particularly favorable.
Where does the methanol go in the Rectisol process?
The CO 2 column is a three-section absorption tower. Methanol plus CO 2 from the primary column is fed to the top of the top section. Methanol plus H 2 S is fed to the top of the middle section. Liquid is withdrawn from the bottom of the middle section, warmed, and reinjected into the bottom of the bottom section.
How is the semi lean solvent cooled in a Rectisol?
The semi-lean solvent from the last separator is cooled by exchanging heat with the loaded solvent and then chilled using ammonia (NH 3) as the refrigerant before returning it to the CO 2 absorber. The remaining portion of the loaded solvent from the CO 2 absorber is sent to the H 2 S absorber.
What kind of impurities can be removed from Rectisol?
It is also able to remove impurities such as hydrocarbons, ammonia, and hydrogen cyanide, consistent with its origin as a treatment for syngas from the Lurgi gasifier which contains these kinds of impurities. The Rectisol process uses a cheap and easily available, non-proprietary solvent, and is flexible in process configuration.