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Method for coupling light hydrocarbon cracking sequential separation process and PDH process

A sequential separation and process technology, used in hydrocarbon cracking to produce hydrocarbons, distillation purification/separation, chemical instruments and methods, etc., can solve the problems of low yield of low-carbon olefins, lengthy separation process, low propylene output, etc., and achieve simplified separation. process, simplify the separation process, reduce the effect of the floor space

Inactive Publication Date: 2019-05-28
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the low yield of low-carbon olefins in the prior art, lengthy separation process, low propylene output, high engineering investment, and large floor area. It provides a new light hydrocarbon cracking sequential separation process and The PDH process coupling method has the advantages of high yield of low-carbon olefins, short separation process, large propylene output, low engineering investment, and small footprint

Method used

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  • Method for coupling light hydrocarbon cracking sequential separation process and PDH process
  • Method for coupling light hydrocarbon cracking sequential separation process and PDH process
  • Method for coupling light hydrocarbon cracking sequential separation process and PDH process

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Embodiment 1

[0019] Using the method of coupling the light hydrocarbon cracking sequence separation process and PDH process of the present invention, the process flow is as follows: (1) PDH device reaction unit: the reaction unit mainly includes propane gasification tank, heating furnace, reactor, deoiling tower and other equipment. Fresh propane and recycled propane as raw materials are first gasified in the propane gasification tank, and then enter the dehydrogenation reactor after being preheated to the reaction temperature by the heating furnace. In the dehydrogenation reactor, propane undergoes dehydrogenation reaction to produce product gas such as propylene. The heavy components at the bottom of the propane gasification tank are sent to the deoiling tower, the propane separated from the top of the tower is returned to the propane gasification tank as a circulating material, and the bottom components are sent to the heating furnace as supplementary liquid fuel. (2) Cracking unit of e...

Embodiment 2

[0027]Coupling the sequential separation of 1 million tons / year ethylene unit with the PDH unit with a nominal capacity of 600,000 tons / year, keeping the ethylene output at 1 million tons / year, and the total propylene output at 736,200 tons / year, the product propylene / ethylene The ratio is 0.74. Compared with Comparative Example 2, the integrated coupling device increases the production of propylene products by 234.6%, consumes 2,114,600 tons of light hydrocarbon cracking raw materials per year, and consumes 629,300 tons of fresh propane raw materials per year, saving engineering construction investment of 397 million yuan, reducing Covers an area of ​​1.8 hectares.

[0028] Table 2 Equipment load increase of ethylene plant

[0029]

[0030]

Embodiment 3

[0034] Coupling the sequentially separated 1.1 million tons / year ethylene unit with the PDH unit with a nominal capacity of 600,000 tons / year, keeping the ethylene output at 1.10 million tons / year, and the total propylene output at 758,200 tons / year, the product propylene / ethylene The ratio is 0.69. Compared with Comparative Example 3, the integrated coupling device increases the production of propylene products by 210.7%, consumes 2,328,800 tons of light hydrocarbon cracking raw materials per year, and consumes 629,300 tons of fresh propane raw materials per year, saving engineering construction investment of 426 million yuan, reducing Covers an area of ​​1.8 hectares.

[0035] Table 3 Equipment load increase of ethylene plant

[0036]

[0037]

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Abstract

The invention relates to a method for coupling a light hydrocarbon cracking sequential separation process and a PDH process, and mainly solves the problems of low carbon olefin yield, long separationflow process, small propylene yield, high project investment and large occupied area. By adopting the method for coupling the light hydrocarbon cracking sequential separation process and the PDH process, an ethylene device with the nominal capacity being 800 to 1200 thousand ton / year and a PDH device with the nominal capacity being 600 thousand ton / year are coupled; the yield of propylene productsis increased by 195.5 to 293.3 percent; the equipment investment cost is reduced by 331 to 488 million yuan; the land occupied area is saved by 1.8 hectares. By adopting the technical scheme, the problems are solved; the method can be used for coupling the light hydrocarbon cracking sequential separation process and the PDH process.

Description

technical field [0001] The invention relates to a method for coupling a light hydrocarbon cracking sequential separation process and a PDH process, which is an integrated coupling method for the process technology of a propane dehydrogenation PDH device and the process technology of a light hydrocarbon cracking ethylene device for a sequential separation process. In this method, the PDH unit only retains the dehydrogenation reaction part and the product gas pretreatment part, and other separation equipment relies on the separation equipment of the ethylene unit, which not only reduces equipment investment and floor space, but also effectively increases the production of propylene, solving the problem of light hydrocarbon cracking ethylene unit products The problem of single structure can be applied to the industrial production of ethylene. Background technique [0002] Ethylene is the most important basic raw material of petrochemical industry, and its production level indic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C11/04C07C5/333C07C4/04C07C7/04
CPCY02P20/52
Inventor 孙蕾张永生彭婷婷
Owner SINOPEC SHANGHAI ENG
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