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C3 fractionation system

A fractionation system and distillation tower technology, applied in the field of C3 fractionation system, can solve problems such as loss of propylene

Pending Publication Date: 2019-08-13
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A large amount of bottoms or a high concentration of propylene in the bottoms will result in greater propylene loss

Method used

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  • C3 fractionation system

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Embodiment Construction

[0011] The term "C3" is understood herein as a hydrocarbon having 3 carbon atoms. In known C3 fractionation columns, the separation is performed with the aim of obtaining a bottom product in which the concentration of propylene is as low as possible. In the disclosed system, fractionation occurs by producing a relatively large amount of a propylene-depleted bottoms product, which results in a bottoms product containing relatively high amounts of propylene. The bottoms product is then used by the cumene production unit to produce cumene. By separating the feed in this way (increased bottoms), more feed can be processed while producing the same purity overhead using the same C3 fractionator. The system of the present disclosure may also allow for a higher purity overhead product to be obtained from the same feed, or to obtain an overhead product of the same purity using a feed having a lower concentration of propylene, without changing the C3 fractionator.

[0012] The bottoms...

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Abstract

A C3 hydrocarbon fractionation system includes: a) a unit for providing a feed containing mainly propane and propylene, b) a C3 fractionation column for separating the feed to provide a top product richer in propylene than the feed and a bottom product leaner in propylene than the feed, wherein the bottom product comprises at least 50 wt% of propylene and c) a cumene production unit comprising analkylation reactor for producing cumene from a propylene feed and a benzene feed, wherein the propylene feed comprises the bottom product of the C3 fractionation column.

Description

technical field [0001] This application relates to C3 fractionation systems and methods of using such systems. Background technique [0002] Propylene can be produced by fractional distillation of propylene using a C3 separation column in which propylene is separated from propane. Typically, the feed is chemical grade propylene, which is the C3 cut (typically 93-95 wt% minimum propylene) produced by a steam cracker after hydrogenation or removal of methyl-acetylene and propadiene. Polymer grade propylene (>99.5 wt%) was produced as overhead product. Due to the close boiling points of propylene and propane, this separation from polymer grade propylene typically requires 150-230 stages and a reflux ratio of 20. A propane-rich stream is produced as bottoms. [0003] Most of the propylene ends up in the overheads, but some propylene ends up in the bottoms, which mainly contains propane. The bottoms are typically sold as fuel or used as feedstock for steam crackers. Large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/085C07C15/04C10G11/18C10G9/36C07C2/64C10G29/20C07C11/06C07C9/08B01D3/00C07C5/32
CPCC07C2/64C10G29/205C10G9/36C10G11/18C10G2300/1092C10G2300/1096C10G2300/4081C10G2400/20C10G2400/30C07C5/327C07C7/04C07C15/085C07C11/06C07C9/08B01J19/245B01J19/2465C07C7/09F25J3/061F25J3/0645B01J19/24B01J19/18B01J3/00B01J2219/00
Inventor 约里斯·万·威利根堡
Owner SABIC GLOBAL TECH BV
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