Method for coupling propane dehydrogenation process and naphtha pre-pyrolysis depropanization process

A technology for propane dehydrogenation and depropanization, which is applied in the directions of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of high engineering investment cost, large equipment area and low output of low-carbon olefins, etc. The effect of reducing floor space, reducing investment, and simplifying process flow

Inactive Publication Date: 2018-01-19
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...

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  • Method for coupling propane dehydrogenation process and naphtha pre-pyrolysis depropanization process

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Embodiment 1

[0022] The present invention relates to a coupling method of PDH process and depropanization process before naphtha cracking. What is to be solved is that the prior art has poor equipment utilization rate, high project investment cost, large floor area and low production of low-carbon olefins. To solve the problem, provide a brand-new integrated process flow for olefin separation of PDH unit and ethylene unit. On the basis of the pre-depropanization separation process of the ethylene unit, only one additional PDH unit reaction system and C3 separation system can be integrated and highly coupled with the ethylene unit of the pre-depropanization separation process, combined as a "two-head This method has the advantages of simple process flow, less investment in equipment, small footprint, and increased production of ethylene propylene.

[0023] The technical scheme that the present invention adopts is as follows:

[0024] PDH unit: Firstly, the fresh propane feed is mixed with th...

Embodiment 2

[0037] Same as [Example 1], the ethylene plant involved in the present invention adopts the pre-depropanization separation process flow, with a nominal capacity of 1 million tons / year, cracking selectivity P / E=0.59; PDH device nominal capacity of 600,000 tons / year. By adopting the process coupling method of the present invention, the load of existing ethylene plant equipment is increased, as shown in Table 3 below.

[0038] Table 3 List of Lifting Load Lifting of Existing Ethylene Plant Equipment

[0039]

[0040]

[0041] Therefore, using the process coupling method of the present invention, compared with [Comparative Example 2] the existing ethylene plant, after the process coupling of the ethylene plant and the PDH plant, the production of polymerization grade ethylene ≥ 99.95wt%, the ethylene output is 1.0197 million tons / year, Increment of 1.970%; production of polymer grade propylene ≥ 99.6wt%, propylene output of 1.1527 million tons per year, increase of 95.373%; ...

Embodiment 3

[0045] Same as [Example 1], the ethylene plant involved in the present invention adopts the pre-depropanization separation process flow, with a nominal capacity of 1.1 million tons / year, cracking selectivity P / E=0.59; PDH device nominal capacity of 600,000 tons / year. By adopting the process coupling method of the present invention, the load of existing ethylene plant equipment is increased, as shown in Table 4 below.

[0046] Table 4 List of Lifting Load Lifting of Existing Ethylene Plant Equipment

[0047]

[0048] Therefore, using the process coupling method of the present invention, compared with [Comparative Example 3] the existing ethylene plant, after the process coupling of the ethylene plant and the PDH plant, the production of polymer grade ethylene ≥ 99.95wt%, the ethylene output is 1.1197 million tons / year, Increment 1.791%; production of polymer grade propylene ≥ 99.6wt%, propylene output 1,211,700 tons / year, increase 86.703%; compared with [Comparative Example ...

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Abstract

The invention relates to a method for coupling propane dehydrogenation process and a naphtha pre-pyrolysis depropanization process, which mainly solves the problems in the prior art that the equipmentutilization rate is low, the engineering investment expense is high, the equipment floor occupation area is large and the yield of the low-carbon olefin is low. By adopting the method for coupling the propane dehydrogenation process and the naphtha pre-pyrolysis depropanization process, the devices of ethylene apparatus separation units are locally modified in a capacity expansion manner, a pyrolysis furnace and a PDH reactor are integrated with the separation unit and connected with two propylene towers in parallel, in a 800 to 1200 thousand tons/year ethylene apparatus and 600 thousand tons/year PDH apparatus and under the condition that E is equal to 0.47 to 0.60, the yield of the ethylene is increased by 1.6 to 2.4 percent, the yield of the propylene is increased by 78 to 119 percent,the investment is decreased by 8.8 to 9.0 percent, and the floor occupation area is reduced by 1.8 hectares; and by adopting the technical scheme, the problems can be well solved. The method can be used in the coupling of the propane dehydrogenation process and the naphtha pre-pyrolysis depropanization process.

Description

technical field [0001] The invention relates to a coupling method between a propane dehydrogenation PDH unit and a depropanization and separation ethylene unit before thermal cracking of naphtha steam; fully relying on the existing equipment of the depropanization and separation process before the ethylene unit, and keeping the total feed of cracking raw materials constant Under the premise of changing, realize the coupling of PDH unit and ethylene unit, so as to reduce equipment investment, reduce construction land, increase the output of low-carbon olefins, and can be applied to the industrial production of low-carbon olefins. Background technique [0002] Ethylene and propylene are important petrochemical basic raw materials. At present, the ethylene unit is the main production unit of low-carbon olefins such as ethylene and propylene, especially the leading industrial production unit for the production of ethylene products. Compared with the ethylene unit, the PDH unit c...

Claims

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Application Information

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IPC IPC(8): C07C5/333C07C4/04C07C11/04C07C11/06
Inventor 周茹英孙蕾
Owner SINOPEC SHANGHAI ENG
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