| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a natural gas liquefaction process that can produce both LNG and separate heavier hydrocarbon liquid product using significantly less energy. <P>SOLUTION: In the process, the natural gas stream 31 to be liquefied is partially cooled, expanded to an intermediate pressure 14, 15, and supplied to a distillation column 19. The bottom product 41 from this distillation column preferentially contains the majority of any hydrocarbons heavier than methane that would otherwise reduce the purity of the liquefied natural gas 50. The residual gas stream 37 from the distillation column 19 is compressed to a higher intermediate pressure 16, cooled under pressure to condense it 60, and then expanded to low pressure to form the liquefied natural gas stream. <P>COPYRIGHT: (C)2013,JPO&INPIT |
