公开(公告)号：US20140260417A1

公开(公告)日：2014-09-18

申请号：US14200395

申请日：2014-03-07

Applicant: CONOCOPHILLIPS COMPANY

Inventor： Karl Lee HERZOG ,  Qi MA ,  Will T. JAMES ,  Attilio J. PRADERIO ,  Jackie CHAN ,  Wesley Roy QUALLS

IPC: F25J1/00

CPC classification number: F25J1/0022 ,  C10L3/101 ,  F25J1/004 ,  F25J1/0052 ,  F25J1/0085 ,  F25J1/0087 ,  F25J1/021 ,  F25J1/0231 ,  F25J1/0237 ,  F25J1/0238 ,  F25J3/0209 ,  F25J3/0233 ,  F25J3/0247 ,  F25J2200/02 ,  F25J2200/78 ,  F25J2205/50 ,  F25J2215/02 ,  F25J2235/60 ,  F25J2245/02 ,  F25J2260/02 ,  F25J2280/02 ,  F25J2280/50

Abstract: Systems and methods for removing heavy hydrocarbons are provided. Methods for liquefying a natural gas stream include: (a) cooling at least a portion of the natural gas stream in an upstream refrigeration cycle of a liquefaction process to produce a cooled natural gas stream; (b) separating via a first distillation column the cooled natural gas stream into a first top fraction and a first bottom fraction, wherein the first fraction does not freeze in a subsequent downstream step of the liquefaction process; (c) separating via a second distillation column the first bottom fraction into a second top fraction and a second bottom fraction, wherein the second top fraction at least a portion of a reflux stream; (d) optionally separating via a third distillation column the second bottom fraction into a third top fraction and a third bottom fraction, wherein the third top fraction forms a portion of the reflux stream; and (e) introducing the reflux stream into the first distillation column.

Abstract translation: 提供了用于除去重质烃的系统和方法。 用于液化天然气流的方法包括：（a）在液化过程的上游制冷循环中冷却至少一部分天然气流以产生冷却的天然气流; （b）通过第一蒸馏塔将冷却的天然气流分离成第一顶部馏分和第一塔底馏分，其中第一馏分在随后的液化过程的下游步骤中不冷冻; （c）通过第二蒸馏塔将第一塔底馏分分离成第二顶部馏分和第二塔底馏分，其中第二顶馏分至少部分回流物流; （d）任选地通过第三蒸馏塔将第二底部馏分分离成第三顶部馏分和第三塔底馏分，其中第三顶馏分形成回流物流的一部分; 和（e）将回流物流引入第一蒸馏塔。

公开(公告)号：US20140238076A1

公开(公告)日：2014-08-28

申请号：US13951021

申请日：2013-07-25

Applicant: CONOCOPHILLIPS COMPANY

Inventor： Wesley Roy QUALLS ,  Qi MA ,  Megan Victoria EVANS ,  Karl Lee HERZOG ,  Jame YAO ,  Mohan CHAHAL ,  Matt Calvin GENTRY ,  Attilio Jose PRADERIO ,  Marc Thomas BELLOMY ,  Satish GANDHI ,  Mike WILKES ,  Will JAMES

IPC: F25J3/06

CPC classification number: F25J1/0022 ,  F25J1/004 ,  F25J1/0045 ,  F25J1/0052 ,  F25J1/0082 ,  F25J1/0085 ,  F25J1/0087 ,  F25J1/0209 ,  F25J1/021 ,  F25J1/0217 ,  F25J1/0238 ,  F25J1/0245 ,  F25J3/0209 ,  F25J3/0233 ,  F25J3/0257 ,  F25J2200/08 ,  F25J2200/40 ,  F25J2200/70 ,  F25J2200/76 ,  F25J2215/60 ,  F25J2220/64 ,  F25J2245/42 ,  F25J2270/02 ,  F25J2270/42

Abstract: Methods and systems for removing nitrogen during liquefaction of natural are provided. Methods of removing nitrogen include warming a predominantly methane stream in a methane cold box to provide a warmed predominantly methane stream; conducting at least a portion of the warmed predominantly methane stream from the methane cold box to a nitrogen removal unit comprising at least a first nitrogen removal column and a last nitrogen removal column, wherein the first nitrogen removal column is located upstream of the last nitrogen removal column; passing the warmed predominantly methane stream through the last nitrogen removal column to provide a refluxed warmed predominantly methane stream; and routing at least a portion of the refluxed warmed predominantly methane stream to the last nitrogen removal column.

Abstract translation: 提供了在天然液化过程中除氮的方法和系统。 去除氮的方法包括在甲烷冷箱中主要加热甲烷流，以提供主要为暖气的甲烷流; 将来自甲烷冷箱的至少一部分加热的主要甲烷物流引导至至少包括第一除氮塔和最后一个除氮塔的除氮单元，其中第一除氮塔位于最后一个氮气去除的上游 柱; 将主要温热的甲烷流通过最后一个除氮塔，以提供回流温热的主要甲烷物流; 并将至少一部分回流加热的主要甲烷物流路由至最后一个除氮塔。