Cracking sequential separation method and methanol to olefins (MTO) coupling method of naphtha and ethane

A technology of ethane cracking and sequential separation, which is applied in the direction of distillation purification/separation, hydrocarbon purification/separation, chemical instruments and methods, etc., which can solve the problems of low propylene production, large consumption of naphtha and ethane raw materials, and production and operation costs advanced questions

Inactive Publication Date: 2019-03-29
SINOPEC SHANGHAI ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the prior art, the raw material consumption of naphtha and ethane is large, the output of propylene is small, the amount of by-products is large, and the production and operation costs are high.

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  • Cracking sequential separation method and methanol to olefins (MTO) coupling method of naphtha and ethane

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Embodiment 1

[0020] Adopt the method of a kind of naphtha and ethane cracking sequence separation and MTO coupling of the present invention, technological process is as follows: Ethylene device: Cracking raw material naphtha and ethane enter cracking furnace to generate steam thermal cracking reaction to generate materials such as ethylene, propylene, The high-temperature cracked gas at the outlet of the cracking furnace enters the quenching zone for quenching treatment, and then is sent to the compression zone for pressurization; the recombined cracking gasoline and cracking fuel oil separated in the quenching zone; the pressurized cracking gas material is combined with the material from the MTO unit After that, it is sent to the demethanizer, and methane and hydrogen are separated from the top of the tower, and the C2 and components above C2 separated from the tower are sent to the deethanizer; the C2 material is separated from the top of the deethanizer, and the material is sent to the et...

Embodiment 2

[0025] Only the nominal capacity of the ethylene unit is changed to 1.1 million tons / year, and the rest of the conditions and steps are exactly the same as in [Example 1]. The propylene production capacity of the coupling device is 506,100 tons / year. Compared with [Comparative Example 2], the propylene production is increased by 132,100 tons / year, 825,400 tons / year of naphtha is reduced, and 353,800 tons / year of ethane is reduced. The price difference between products and raw materials can save 1.29 billion yuan per year.

Embodiment 3

[0029] Only the nominal capacity of the ethylene plant is changed to 1 million tons / year, and the rest of the conditions and steps are exactly the same as in [Example 1]. The propylene production capacity of the coupling device is 472,100 tons / year. Compared with [Comparative Example 3], the propylene production is increased by 132,100 tons / year, 825,400 tons / year of naphtha is reduced, and 353,800 tons / year of ethane is reduced. The price difference between products and raw materials can save 1.29 billion yuan per year.

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Abstract

The invention relates to a cracking sequential separation method and methanol to olefins (MTO) coupling method of naphtha and ethane, and mainly solves the problems of high consumption of naphtha andethane raw materials, small yield of propylene, large number of byproducts and high production and operation cost in the prior art. According to the method, the cracking sequential separation method and MTO coupling method of naphtha and ethane are adopted, and through a sequential separation technical process of an ethylene plant, an ethylene plant of 1-1.2 million-ton/year is coupled with an MTOplant of 1.8 million-ton/year, so that the amount of naphtha and ethane consumption can be reduced by 0.7855-1.1792 million-ton/year, the propylene yield is increased by 0.1323-0.2452 million-ton/year, and the economic benefits are increased by 0.29-1.29 billion-yuan/year. According to the technical scheme, the problems are well solved, and the method can be used in cracking sequential separationand MTO coupling of naphtha and ethane.

Description

technical field [0001] The invention relates to a method for sequential separation of naphtha and ethane cracking and MTO coupling. Relying on the existing sequential separation process ethylene production unit, using methanol as raw material to replace part of naphtha and ethane can effectively increase the production capacity of propylene, increase the yield of low-carbon olefins, reduce the number of by-products and reduce production and operation costs. It can be applied In the industrial production of light olefins. Background technique [0002] Ethylene is mainly obtained by cracking naphtha and light hydrocarbons, atmospheric diesel oil, hydrogenated tail oil, etc. It is the cornerstone of the petrochemical industry, so the development of cracking technology is very important for ethylene plants. After long-term research and development, the technology of the cracking furnace is becoming more and more mature, and it is developing towards expanding the production scal...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C11/06C07C1/20C07C4/04C07C7/04
CPCC07C1/20C07C4/04C07C7/005C07C7/04C07C11/04C07C11/06Y02P30/20Y02P30/40
Inventor 孙蕾张永生彭婷婷
Owner SINOPEC SHANGHAI ENG
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