The use of methane (CH4), ethane (C2H6), ethylene (C2H4), propylene (C3H6), and propane (C3H8) pure light hydrocarbons as refrigerants is quite common, practical, and economical for many hydrocarbon processing plants. Examples include ethylene manufacture from cracking some feedstock, ethylene or other hydrocarbon recycle purification plants, gas-treating plants, and petroleum refineries.
Commonly used hydrocarbon refrigerants and their cooling temperatures are given in the following table .
|Methane||−200 to −300°F||(−129 to −184°C)|
|Ethane||−75 to −175°F||(−59 to −115°C)|
|Ethylene||−75 to −175°F||(−59 to 115°C)|
|Propane||+40 to −50°F||(4 to −46°C)|
|Propylene||+40 to −50°F||(4 to −46°C)|
Methane is used infrequently in industrial plants for this ...