Clean Coal to Gasoline Process (CCTG)
The TransGas reference plant design transforms coal and water into gasoline and liquefied petroleum gas (LPG) using proven technologies in a unique combination that meets stringent US Clean Air requirements.
This video walks you through the science behind the TransGas technology system.
- Coal is received and ground to powder like consistency in enclosed structures that minimalize fugitive dust.
- Coal powder is injected into a high pressure vessel with carefully controlled portions of pure oxygen and steam. A chemical reaction called gasification occurs that produces a gas composed of carbon monoxide and hydrogen with trace amounts of carbon dioxide, hydrogen sulfide and smaller amounts of other gases. This gas mixture is referred to as raw syngas.
- The raw syngas is then passed through a series of processes where the trace gases are removed and converted into marketable products or solid materials that can be transported and used in other processes.
- Clean syngas is now ready for conversion to liquids. The first step is passing the syngas over a catalyst that separates the carbon monoxide into individual carbon and oxygen atoms that are then recombined with hydrogen molecules to form methanol.
- Methanol is not only a product unto itself and the basis for gasoline; but it is also used in the removal of carbon dioxide from the raw syngas. The TransGas system, unlike other fossil fuel processes, effectively captures its carbon dioxide and purifies it to near food grade quality ready for other uses.
- A unique component of the TranGas system is its ability to store methanol as an intermediate product. This allows a TransGas plant to achieve an availability percentage much higher than any other solid to liquid technology. TransGas can produce gasoline from stored methanol that means routine maintenance that interrupts production on other’s plants does not affect TransGas.
- Upon leaving this section of the TransGas system the gasoline is ready for use in the traditional distribution system. With only minor variation in standard additives it can be made compatible with any of the brands of gasoline on the market today.
The fact that clean syngas converted directly to liquid products without addition refinery operations separates the TransGas system from that of those based upon Fischer-Tropsch synthesis. This not only reduces the cost of construction and operations, it dramatically eliminates the creation of toxic air pollution associated with the refinery processes that are part of those other plants.