Transportation Operations LINCS Practice Exam

How is Liquefied Natural Gas produced?

1. By filtering impurities from natural gas

2. By chilling and compressing natural gas

3. By burning natural gas at high temperatures

4. By combining natural gas with other chemicals

The correct answer is: By chilling and compressing natural gas

Liquefied Natural Gas (LNG) is produced primarily through the process of chilling and compressing natural gas. This process involves cooling natural gas to extremely low temperatures, typically around -162 degrees Celsius (-260 degrees Fahrenheit), at which point the gas condenses into a liquid state. This liquefaction not only reduces the volume of the natural gas by about 600 times, making it easier to transport and store, but it also makes it feasible to move the gas by sea in specially designed LNG carriers. The chilling process is essential because it removes various components present in the natural gas, such as water, carbon dioxide, and sulfur compounds, which could interfere with the liquefaction and storage processes. Compression, on the other hand, helps to achieve the desired pressures needed for the gas efficiency and safety during the liquefaction process. Other methods mentioned in the options involve different processes that do not yield liquefied natural gas. For instance, filtering impurities is important to prepare natural gas for use, but it does not result in liquefaction. Burning natural gas produces energy and emissions rather than converting it into a liquid form, and combining it with other chemicals is not a standard practice in LNG production but rather pertains to gas processing or chemical synthesis