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Method and system for preparing propylene

A technology of propylene and propane, applied in the field of propylene preparation, can solve the problems of large investment, high energy consumption, unstable operation of the device, etc., and achieve the effects of reducing energy consumption, reducing load and improving operation stability of the device

Active Publication Date: 2020-03-31
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this disclosure is to provide a method and system for preparing propylene by relaxing the restrictions on the content of methylacetylene and propadiene in the feed to overcome the problems of unstable device operation, high energy consumption, and large investment in the existing method

Method used

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  • Method and system for preparing propylene

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Embodiment

[0064] Such as figure 1As shown, the fresh propane raw material of 99.28 kg is removed after nitrogen oxides, heavy metals and water, and then introduced into a heavy removal device for heavy components such as carbon four. The content of methyl acetylene in the fresh propane raw material is 120ppmmol, The content of propadiene is 50 ppm mol. The deheavy treated material is then introduced into the MAPD hydrogenation unit for MAPD hydrogenation treatment to remove impurities such as methyl acetylene and propadiene. The hydrogen distribution amount of the MAPD hydrogenation treatment is 1.7. The hydrotreated liquid C was then 3 The material is introduced into the cold separation device, and becomes gaseous C after heat exchange treatment in the cold separation device. 3 The material is introduced into the PDH dehydrogenation unit for PDH dehydrogenation treatment. The material after dehydrogenation treatment is compressed, dechlorinated, dried, and desulfurized, and then ent...

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Abstract

The invention relates to a method and a system for preparing propylene. The method comprises the following steps: carrying out heavy component removal treatment on a propane raw material to remove heavy components containing more than 4 carbon atoms so as to obtain a heavy-component-removed material; carrying out MAPD hydrogenation treatment on the heavy-component-removed material to obtain a hydrogenated material; carrying out PDH dehydrogenation treatment on the hydrotreated material to obtain a PDH-dehydrogenated material; removing hydrogen and ethane from the PDH-dehydrogenated material, and rectifying to obtain distilled propylene and a second distillation residue material; and carrying out heavy component removal treatment on the second distillation residue material and the propane raw material. According to the invention, the problems of unstable device operation, high energy consumption and large investment in the prior art can be overcome, and the limitation on the content ofmethylacetylene and propadiene in fed materials is relaxed.

Description

technical field [0001] The present disclosure relates to the field of chemical engineering, in particular, to a method and system for preparing propylene. Background technique [0002] In the traditional process for preparing propylene, the raw material liquid phase propane enters the cold separation system after pretreatment and removal of heavy components such as C4, and then vaporizes into the propane dehydrogenation unit after heat exchange, throttling and pressure reduction in the cold separation system The output of the propane dehydrogenation unit is sent to the cold separation system after gas compression and impurity removal; the crude hydrogen separated by the cold separation system enters the crude hydrogen compression and pressure swing adsorption purification unit to purify the hydrogen to 99.99% v, crude The tail gas purified by hydrogen compression and pressure swing adsorption is introduced into the propane dehydrogenation unit as fuel gas. The C3 stream sepa...

Claims

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Application Information

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IPC IPC(8): C07C5/327C07C7/00C07C7/04C07C7/163C07C11/06C07C9/08
CPCC07C5/327C07C7/04C07C7/005C07C7/163C07C11/06C07C9/08Y02P20/52
Inventor 赵百仁白宇辰潘鹏李广华高耸蒋荣兴
Owner SINOPEC ENG
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