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Olefins-paraffins separation process by membrane

A separation method and paraffin technology, applied in separation methods, semi-permeable membrane separation, membrane purification/separation, etc., can solve the problems affecting product separation efficiency and energy saving efficiency, low production capacity and separation efficiency, and poor energy saving efficiency, etc. question

Pending Publication Date: 2021-12-14
PTT GLOBAL CHEMICAL PUBLIC COMPANY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the number of stages of the membrane unit and the location of the membrane unit affect the separation efficiency and energy saving efficiency of the product
Placing the membrane unit in one or two positions connected to the feed stream, top stream, bottom stream or recycle stream of the distillation column makes the production capacity and separation efficiency low, and the energy saving efficiency obtained is not very good

Method used

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  • Olefins-paraffins separation process by membrane
  • Olefins-paraffins separation process by membrane
  • Olefins-paraffins separation process by membrane

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[0018] definition

[0019] Unless otherwise stated, the technical terms or scientific terms used herein have the definitions of those skilled in the art.

[0020] Any tool, device, method or chemical substance mentioned here refers to a tool, device, method or chemical substance commonly used by those skilled in the art, unless otherwise stated that they are specific tools, devices, methods or chemical substances in the present invention.

[0021] The use of the singular noun or singular pronoun of "comprising" in the claims or specification means "one" and also includes "one or more", "at least one" and "one or more".

[0022] All compositions and / or methods and claims disclosed in this application, although not specifically recited in the claims, are intended to cover any acts, performance, modified or adjusted embodiments that are significantly different from the present invention and according to the art One of ordinary skill obtains the same utility and results as this e...

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Abstract

The present invention relates to an olefins-paraffins separation process in feed stream containing hydrocarbons with 2 to 4 carbon atoms by facilitated transport membrane specific to olefins, comprising the following step: a. feeding the feed stream containing hydrocarbons with 2 to 4 carbon atoms into distillation column and at least 1 stage of membrane unit connected to distillation column at the feed of distillation column and at least 1 stage of membrane unit connected to the side draw of distillation column; and b. separating a portion of feed stream that is passed from the membrane unit, at least 1 stream is the product stream that mostly comprising olefins and at least 1 stream that mostly comprising paraffins.

Description

technical field [0001] Chemical engineering deals with olefin-paraffin membrane separation methods. Background technique [0002] In olefin-paraffin feedstreams with similar numbers of carbon atoms, olefin separation processes typically operate by distillation, which is the traditional method using very high reflux ratios because the species to be separated have close relative volatilities, resulting in the above Separation methods require very high energy. Therefore, in order to increase the separation efficiency of olefinic products and reduce energy consumption, studies have been started on the use of membranes in the distillation process. However, the number of stages of the membrane unit and the location of the membrane unit affect the separation efficiency and energy saving efficiency of the product. Placing the membrane unit at one or two positions connected to the feed stream, top stream, bottom stream or recycle stream of the distillation column makes the producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/04C07C7/144
CPCB01D3/145C07C7/04C07C7/144B01D61/3641C07C9/10C07C11/08B01D61/366B01D2311/04B01D2311/06B01D2311/2669B01D2317/025
Inventor P·素旺S·真达蓬S·西玛卡永吉N·卡廷洪
Owner PTT GLOBAL CHEMICAL PUBLIC COMPANY LIMITED