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Method for coupling propane dehydrogenation technology and deethanization technology before naphtha cracking

A technology for propane dehydrogenation and naphtha, which is applied in the direction of hydrocarbons, hydrocarbons, chemical instruments and methods, and can solve the problems of low production of low-carbon olefins, large equipment footprint, and high project investment costs

Inactive Publication Date: 2018-02-09
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that there are problems in the prior art such as low equipment utilization rate, high engineering investment cost, large equipment footprint, and low production of low-carbon olefins. A new propane dehydrogenation process and naphtha The method of deethanization process coupling before cracking has the advantages of high equipment utilization rate, low project investment cost, small equipment footprint, and high output of low-carbon olefins

Method used

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  • Method for coupling propane dehydrogenation technology and deethanization technology before naphtha cracking

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Embodiment 1

[0027] The present invention relates to a coupling method of PDH process and deethanization process before naphtha cracking. Technical problems such as low olefin yield. Provide a new type of olefin separation integration process for PDH unit and ethylene unit. On the premise of keeping the cracking raw materials of the ethylene unit unchanged, based on the partial capacity expansion and transformation process of the existing separation equipment for deethanization before the ethylene unit, only Add one PDH reaction system and one C3 separation system, which can be highly integrated with the deethanization separation process before the ethylene plant, combined into a new coupling method of "two heads, one tail", which has the advantages of process It has the advantages of simple process, high equipment utilization rate, low project investment cost, small equipment footprint, and can increase the production of low-carbon olefins such as ethylene propylene, and can avoid the cos...

Embodiment 2

[0043] The PDH process of the present invention is coupled with the deethanization process before naphtha cracking, the ethylene unit adopts the pre-deethanization separation process, the nominal capacity is 1 million tons / year, and the cracking selectivity P / E=0.55; the PDH unit The nominal capacity is 600,000 tons / year.

[0044] Table 3 Raising load table of original ethylene equipment after integration

[0045]

[0046]

[0047] Therefore, polymer grade ethylene ≥ 99.95wt%, ethylene output is 1.0197 million tons / year; polymer grade propylene is ≥99.6wt%, propylene output is 1.069 million tons / year, and the engineering construction investment of ethylene unit and PDH unit process coupling is 6.661 billion yuan . Compared with the existing ethylene plant in [Comparative Example 2], the ethylene output increased by 1.970%, the propylene output increased by 94.364%, and the project construction investment was saved by 558 million yuan, which is equivalent to saving inves...

Embodiment 3

[0051] The PDH process of the present invention is coupled with the deethanization process before naphtha cracking, the ethylene unit adopts the pre-deethanization separation process, the nominal capacity is 1.1 million tons / year, and the cracking selectivity P / E=0.55; the PDH unit The nominal capacity is 600,000 tons / year.

[0052] Table 4 Lifting load table of original ethylene equipment after integration

[0053] serial number

[0054] Thus, polymer grade ethylene ≥ 99.95wt%, ethylene output 1,119,700 tons / year; polymer grade propylene ≥99.6wt%, propylene output 1,124,000 tons / year, engineering construction investment of ethylene unit and PDH unit process coupling 6.929 billion yuan . Compared with the existing ethylene plant in [Comparative Example 3], the ethylene output increased by 1.791%, the propylene output increased by 85.785%, and the project construction investment was saved by 571 million yuan, which is equivalent to saving investment by 7.609%, and the ...

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Abstract

The invention relates to a method for coupling propane dehydrogenation technology and deethanization technology before naphtha cracking, and mainly solves the problems of low equipment utilization rate, high project investment cost, large equipment occupied area and low low-carbon olefin content existing in the prior art. By adopting the method for coupling propane dehydrogenation technology and deethanization technology before naphtha cracking, local capacity expansion is carried out on ethylene unit equipment, a cracking furnace as well as two heads of a PDH reactor and one body of a separating unit are arranged, two tails of two propylene towers are connected in parallel, under the conditions that the selective P / E rate is equal to 0.47 to 0.60 in an ethylene unit (800 to 1500 thousandtons per year) and a PDH device (600 thousand tons per year), 1.313% to 2.462% of ethylene is increased, 57.667% to 117.955% of propylene is increased, 7.609% to 8.077% of investment is reduced, and 1.8 hectares of occupied area is reduced. Through the technical scheme, the above problem is preferably solved, and the method can be used for coupling propane dehydrogenation technology and deethanization technology before naphtha cracking.

Description

technical field [0001] The invention relates to a coupling process between a propane dehydrogenation process (PDH) unit and an ethylene unit for deethanization and separation before naphtha thermal cracking; while keeping the cracking raw materials of the ethylene unit unchanged, fully relying on the deethanization separation process before the ethylene unit On the premise of existing equipment and partial capacity expansion and transformation, the coupling of PDH unit and ethylene unit is realized to increase the output of low-carbon olefins, reduce equipment engineering investment, and reduce construction land. At the same time, the invention not only reduces the fixed investment and operating costs of industrial production devices, but also fully improves the flexibility of process devices to respond to market changes, and can be applied to the industrial production of ethylene, propylene and low-carbon olefins. Background technique [0002] Ethylene and propylene are imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/327C07C11/06C07C4/04C07C11/04C07C7/04C07C7/00
CPCC07C4/04C07C5/327C07C7/005C07C7/04C07C11/06C07C11/04Y02P30/40
Inventor 张永生陈益
Owner SINOPEC SHANGHAI ENG
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