Low cost thermal coupling in ethylene recovery
    1.
    发明授权
    Low cost thermal coupling in ethylene recovery 失效
    乙烯回收中的低成本热偶合

    公开(公告)号:US5675054A

    公开(公告)日:1997-10-07

    申请号:US503486

    申请日:1995-07-17

    摘要: The invention is a process for reducing capital and energy costs in ethylene recovery. Moderate pressure processing and thermally coupled fractionation steps are achieved through the use of integrator columns. Ethylene separation from cracked gas originating from ethane through gas oil feeds can now be done with thermodynamically efficient fractionation at capital cost competitive with low efficiency designs. Acetylene hydrogenation may be done before demethanization where desired, and dephlegmation is preferred to accomplish high-efficiency rectification of hydrogen and methane from ethylene. Open loop heat pumps can optionally be incorporated into the ethane/ethylene splitter fractionation step, whose desirability is controlled by optimization of capital and energy costs.

    摘要翻译: 本发明是减少乙烯回收中的资本和能源成本的过程。 通过使用积分柱实现中等压力处理和热耦合分馏步骤。 现在可以通过热力学有效的分馏,以低效设计竞争的资本成本来进行乙烯与源自乙烷的瓦斯油进料裂解气体的分离。 乙炔加氢可以在脱甲烷化之前进行,如果需要的话,分馏是优选的,以实现从乙烯高效地精馏氢和甲烷。 开环热泵可以任选地并入到乙烷/乙烯分离器分馏步骤中,其优点是通过资本和能源成本的优化来控制。

    Mixed refrigerants in ethylene recovery
    2.
    发明授权
    Mixed refrigerants in ethylene recovery 失效
    乙烯回收混合制冷剂

    公开(公告)号:US5626034A

    公开(公告)日:1997-05-06

    申请号:US560469

    申请日:1995-11-17

    IPC分类号: C07C7/04 F25J3/02 F25J1/00

    摘要: The present invention is a process of high efficiency rectification zone separation of cracked or other ethylene-containing gas chilled primarily by two closed mixed refrigerant loops and at least part of the dephlegmated overhead gas. The composition of the mixed refrigerants is optimally chosen to obtain an extremely close approach between the process condensation temperatures in the high efficiency rectification zone and the temperature of the chilling streams. An approach of about 3.degree. F. to 8.degree. F. can be achieved for the full condensation curve in the high efficiency rectification zone operating with either ethane or naphtha derived cracked gas. Highly reliable and stable operation is obtained by closed refrigeration loops in the present invention, in addition to reducing high efficiency rectification zone design cost.

    摘要翻译: 本发明是一种主要由两个封闭的混合制冷剂回路和至少部分分馏塔顶气体冷冻的裂化或其它含乙烯气体的高效精馏区分离方法。 最佳选择混合制冷剂的组成以在高效精馏区的工艺冷凝温度和冷却物流的温度之间获得非常接近的方法。 在用乙烷或石脑油衍生的裂解气体运行的高效精馏区,可以获得约3°F至8°F的方法。 除了降低高效整流区设计成本之外,本发明的闭式制冷回路也能获得高可靠性和稳定的运转。

    Optimized heating value in natural gas liquids recovery scheme
    5.
    发明授权
    Optimized heating value in natural gas liquids recovery scheme 有权
    天然气液体回收方案优化发热值

    公开(公告)号:US06964181B1

    公开(公告)日:2005-11-15

    申请号:US10651178

    申请日:2003-08-28

    IPC分类号: F25J1/00 F25J3/00 F25J3/02

    摘要: A process and apparatus for controlling or reducing the heating value or BTU content of NGL recovered from LNG streams. LNG pipelines have a maximum allowable heating value that LNG must be within prior to entering the pipeline. If the LNG heating value is too high, the components contributing to the high heating value must be removed prior to being introduced in the pipeline. The process controls the heating value of the residue LNG gas stream by splitting a feed stream and warming at least a portion of the feed stream. Substantial differences in enthalpy content and temperature between the two portions of the feed stream exist prior to being sent to a fractionation tower.

    摘要翻译: 用于控制或降低从LNG流回收的NGL的热值或BTU含量的方法和装置。 LNG管道具有LNG进入管道之前必须在其中的最大允许热值。 如果LNG热值太高,则在引入管道之前必须去除有助于高发热值的部件。 该方法通过分离进料流并加热至少一部分进料流来控制残余LNG气流的热值。 进料流的两部分之间的焓含量和温度之间的明显差异在送入分馏塔之前就存在。