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Method for deethanization and PDH coupling before cracking of naphtha and propane

A naphtha, pre-cracking technology, used in hydrocarbon cracking to produce hydrocarbons, organic chemistry, distillation purification/separation, etc., can solve the problems of single raw material structure, large floor space, and poor ability to respond to market changes.

Inactive Publication Date: 2019-06-07
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of lengthy separation process, large footprint, high fixed investment, unreasonable product structure, single raw material structure, and poor ability to respond to market changes in the prior art. A new naphtha is provided And the method of deethanization and PDH coupling before propane cracking has the advantages of short separation process, small footprint, low fixed investment, reasonable product structure, and strong ability to respond to market changes

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  • Method for deethanization and PDH coupling before cracking of naphtha and propane

Examples

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Effect test

Embodiment 1

[0020] Adopt a kind of method of deethanization and PDH coupling before naphtha and propane cracking of the present invention, technological process is as follows: (1) ethylene plant reaction and pretreatment system: cracking raw material naphtha and propane enter steam pyrolysis furnace and carry out cracking Reaction, cracking reaction, the high-temperature pyrolysis gas of the hydrocarbon mixture is subjected to pretreatment such as quenching and water washing, and the separated pyrolysis gasoline and pyrolysis fuel oil are sent out of the boundary as by-products, and the pyrolysis gas continues to be compressed, alkali washed, and dried. gas. (2) Reaction and pretreatment system of PDH unit: Fresh propane, recycled propane and the top effluent gas of the deoiling tower are used as the feed of the propane gasification tank for gasification treatment. The gasified gas phase is further preheated and enters the heating furnace and dehydrogenation reaction system for dehydrogen...

Embodiment 2

[0025] The ethylene plant with a nominal capacity of 1.1 million tons / year adopts the pre-deethanization separation process. The raw material is composed of 30% naphtha and 70% propane. The output of ethylene is 1.10 million tons / year, and the output of propylene is 440,000 tons / year. The volume is 2.8401 million tons / year. The nominal capacity of the PDH unit is 60 tons / year, the output of ethylene is 25,200 tons / year, and the output of propylene is 546,000 tons / year. After coupling the ethylene unit and the PDH unit, the total output of ethylene is 1.1252 million tons / year, the output of propylene is 986,000 tons / year, and the construction investment of the integrated unit is 6.728 billion yuan. Compared with [Comparative Example 2], after the integrated coupling transformation of the present invention, the ethylene production increased by 25,200 tons / year, the propylene production increased by 546,000 tons / year, the ethylene output increased by 2.29%, the propylene output i...

Embodiment 3

[0029] The ethylene plant with a nominal capacity of 1 million tons / year adopts the pre-deethanization separation process. The raw material is composed of 30% naphtha and 70% propane. The output of ethylene is 1 million tons / year, and the output of propylene is 400,000 tons / year. The volume is 2.5819 million tons / year. The nominal capacity of the PDH unit is 60 tons / year, the output of ethylene is 25,200 tons / year, and the output of propylene is 546,000 tons / year. After coupling the ethylene unit and the PDH unit, the total output of ethylene is 1.0252 million tons / year, and the output of propylene is 946,000 tons / year. The construction investment of the integrated unit is 6.464 billion yuan. Compared with [Comparative Example 3], after the integrated coupling transformation of the present invention, the ethylene production increased by 25,200 tons / year, the propylene production increased by 546,000 tons / year, the ethylene output increased by 2.52%, the propylene output increa...

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Abstract

The invention relates to a method for deethanization and PDH coupling before cracking of naphtha and propane, and mainly solves the problems of long separation process, large occupied area, high fixedinvestment, unreasonable product structure, single raw material structure and poor market change coping capability in the prior art. By means of the method, the ethylene yield is maintained, whereinan ethylene device of 800,000-1,200,000 ton / year is coupled with a PDH device of 600,000 ton / year, so that the investment is saved by 445-617 million yuan, the land occupation is reduced by 1.8 hectares, the propylene / ethylene ratio is increased to 0.84-1.05, the ethylene yield is increased by 25,200 ton / year and the propylene yield is increased by 546,000 ton / year. According to the technical scheme, the problems are well solved. The method can be used for deethanization and PDH coupling before cracking of naphtha and propane.

Description

technical field [0001] The invention relates to a method for coupling deethanization and PDH before naphtha and propane cracking, and is a process technology for coupling the process technology of a propane dehydrogenation PDH device to the separation process of deethanization before naphtha and propane cracking of an ethylene device ; While fully relying on the separation equipment of the deethanization process before the ethylene plant, reducing the floor area and equipment investment, it is a method to increase the production of propylene and optimize the product structure of the ethylene plant with naphtha and propane as raw materials. The invention not only optimizes the product structure, improves the flexibility of the ethylene plant to respond to market changes, but also reduces the land for plant construction, equipment investment and operating costs, and can be applied to the industrial production of ethylene, propylene and low-carbon olefins. Background technique ...

Claims

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Application Information

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IPC IPC(8): C07C4/06C07C7/04C07C11/04C07C11/06
Inventor 彭婷婷张永生何琨
Owner SINOPEC SHANGHAI ENG
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