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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 high energy consumption, unstable operation of the device, large investment, etc., and achieve the effects of reducing energy consumption of the device, reducing the number of equipment, and reducing the load

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

AI Technical Summary

Problems solved by technology

[0004] The purpose of this disclosure is to provide a method for preparing propylene by overcoming the problems of unstable device operation, high energy consumption, and large investment in the existing method, eliminating the restrictions on the content of methylacetylene and propadiene when purchasing raw materials, and reducing the difficulty of separation

Method used

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  • Method and system for preparing propylene

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Embodiment

[0066] like figure 1 As shown, 99.28 tons / hour of fresh propane raw material is subjected to denitrification, heavy metal removal and dehydration drying pretreatment and then introduced into the MAPD hydrogenation unit for MAPD hydrogenation treatment to obtain the raw material after hydrotreatment, wherein the fresh propane raw material is The content of acetylene is 50ppm mol, the content of propadiene is 50ppm mol, and the hydrogen distribution amount of MAPD hydrotreating is 1.7. Subsequently, the raw material after hydrotreating is introduced into the deweighting device for deweighting treatment to remove heavy components such as carbon four, and then the raw material deweighted is introduced into the cold separation device, and becomes gaseous C after heat exchange in the cold separation device. 3 The material is then subjected to PDH dehydrogenation treatment. The material after dehydrogenation treatment is compressed, dechlorinated, dried, and desulfurized, and then e...

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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 MAPD hydrotreatment on a propane raw material to obtain a hydrotreated material; carrying out heavy component removal treatment on the hydrotreated material to remove heavy components containing more than 4 carbon atoms so as to obtain a heavy component-removed material; carrying out PDH dehydrogenation treatment on the material having undergone heavy component removal treatment so as to obtain a material having undergone PDH dehydrogenation treatment; removing hydrogen and ethane from the material having undergone PDH dehydrogenation treatment, and carrying out rectification treatment to obtain distilled propylene and a second distillation residual material; and carrying out MAPD hydrotreatment on the second distillation residual material and the propane raw material. According to the invention, the problems of unstable device operation, high energy consumption and large investment in conventional methods can be solved, the limitation on the content of methylacetylene and propadiene during raw material purchasing is eliminated, and separation difficulty isreduced.

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): C07C11/06C07C5/333C07C7/00
CPCC07C5/333C07C7/005C07C11/06
Inventor 赵百仁白宇辰潘鹏王振维盛在行刘罡
Owner SINOPEC ENG
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