TH78331A - Liquefaction of natural gas - Google Patents

Abstract

The DC60 has disclosed a method for liquefying natural gas, which is combined with current generation. Liquids containing hydrocarbons that are heavier than methane are primarily used in the gas flow process to be obtained. Liquefaction Will be partially cooled And is divided into the first and second currents, the first currents are further cooled for all significant condensation of this current, which is amplified until there is a neutral pressure and then Get shipped to the distillation column at the center of the first column. The second current has been inflated until there is a pressure. The middle value is also available and is then shipped to the distillation column at the center input location. Second bottom column The distillation current is drawn from the column below the second current feed point and is cooled to at least part of this condensing current forming the reflux current. At least part of the reflux current has been forced to The distillation column is the top feed stream. Bottom products from this distillation column should contribute Primarily, any hydrocarbon is heavier than methane. Which if this is not done will reduce the purity of the gas Liquid nature The residual gas stream from the distillation column is compressed to a higher central pressure, cooled under pressure for condensation, and then expanded to provide a Low pressure for the formation of a liquid natural gas stream Has disclosed a process for the liquefaction of natural gas, which, together with the production of current Liquids containing hydrocarbons that are heavier than methane are primarily used in the gas flow process to be obtained. Liquefaction Will be partially cooled And is divided into the first and second currents, the first currents are further cooled for all significant condensation of this current, which is amplified until there is a neutral pressure and then Get shipped to the distillation column at the center of the first column. The second current has been inflated until there is a pressure. The middle value is also available and is then shipped to the distillation column at the center input location. Second bottom column The distillation current is drawn from the column below the second current feed point and is cooled to at least part of this condensing current forming the reflux current. At least part of the reflux current has been forced to The distillation column is the top feed stream. Bottom products from this distillation column should contribute Primarily, any hydrocarbon is heavier than methane. Which if this is not done will reduce the purity of the gas Liquid nature The residual gas stream from the distillation column is compressed to a higher central pressure, cooled under pressure for condensation, and then expanded to provide a Low pressure for the formation of a liquid natural gas stream

Claims (1)

: DC60 discloses a process for liquefying natural gas which involves producing a stream of liquids consisting primarily of hydrocarbons heavier than methane. In the process, the natural gas stream to be liquefied is partially cooled and divided into a first and a second stream. The first stream is further cooled so as to condense substantially all of this stream, is expanded to a median pressure, and then delivered to a distillation column at the first center feed position. The second stream is also expanded to a median pressure, and then delivered to a distillation column at the second center feed position. The distillation stream is removed from the column below the feed point of the second stream and is cooled so as to condense at least a portion of this stream, thus forming a reflux stream. At least a portion of the reflux stream is forced into the distillation column as the top feed stream. The bottom product from this distillation column shall consist primarily of any hydrocarbon heavier than methane, failing which would reduce the purity of the liquefied natural gas. The residual gas stream from the distillation column is compressed to a higher intermediate pressure, cooled under pressure to condense the stream, and then expanded to a lower pressure to form a natural gas liquefaction stream. A method for liquefying natural gas is disclosed, which involves producing a stream of liquids consisting primarily of hydrocarbons heavier than methane. In the process, the natural gas stream to be liquefied is partially cooled and divided into a first and a second stream. The first stream is further cooled to condense substantially all of this stream, expanded to an intermediate pressure, and then delivered to a distillation column at the first center feed position. The second stream is also expanded to an intermediate pressure, and then delivered to a distillation column at the second center feed position, the lower column. The distillation stream is extracted from the column below the feed point of the second stream, and is cooled to condense at least a portion of this stream, thus forming a reflux stream. At least a portion of the reflux stream is forced into the distillation column as the top feed stream. The bottom product from this distillation column shall contain a portion of The principal is any hydrocarbon heavier than methane, the failure of which would reduce the purity of the liquefied natural gas. The residual gas stream from the distillation column is compressed to a higher intermediate pressure, cooled under pressure to condense the stream, and then expanded to a lower pressure to form the liquefied natural gas stream. Claim (one) which appears on the advertising page: 1. In a process for liquefying a natural gas stream containing methane and heavier hydrocarbon components, wherein (a) said natural gas stream is cooled under pressure to liquefy &nbstag :