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Coupling method of mto process and sequential separation process of naphtha cracking

A sequential separation and naphtha technology, which is applied in the production of hydrocarbons from oxygen-containing organic compounds, biological raw materials, ethylene production, etc., can solve the problems of large investment, unreasonable process design, and low efficiency of raw material products, so as to ensure the production capacity of ethylene , reduce energy consumption, reasonable design effect

Active Publication Date: 2016-05-11
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of unreasonable process design, large investment, and low benefit of raw material products in the existing coupling technology. It provides a new method for coupling the MTO process and the sequential separation process of naphtha cracking

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  • Coupling method of mto process and sequential separation process of naphtha cracking
  • Coupling method of mto process and sequential separation process of naphtha cracking

Examples

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Effect test

Embodiment 1

[0022] The naphtha steam cracking ethylene plant adopts a sequential separation process. The ethylene capacity is 1.2 million tons / year, the mass ratio of propylene to ethylene in the cracked gas is 0.51, and the methanol processing scale of the new MTO unit is 1.8 million tons / year. The mass ratio of ethylene to propylene in the MTO product gas is 1.5. After the product gas of the MTO unit is separated and compressed in the coarse separation tower, 50% of the C3 and all lighter components are sent to the five-stage compression outlet of the cracking unit, and enter the cold box of the cracking unit together with the cracked gas; the product gas of the MTO unit is being depropanized After the tower is separated, the tower still liquid and the depropanizer still liquid of the naphtha steam cracking ethylene plant will enter the debutanizer of the ethylene plant for separation. By adopting the coupling method of the present invention, the operating conditions of the coarse separa...

Embodiment 2

[0026] According to the conditions and steps described in Example 1, the ethylene production capacity of the naphtha steam cracking ethylene plant is 1.1 million tons / year. The specific data are shown in Table 1. Compared with Comparative Example 2, the amount of naphtha was reduced by 1.293 million tons per year and the production of propylene was increased by 63,500 tons per year.

Embodiment 3

[0030] According to the conditions and steps described in Comparative Example 1, the ethylene production capacity of the naphtha steam cracking ethylene plant is 1 million tons / year, and the mass ratio of ethylene to propylene in the product gas of the newly added MTO plant is 0.8. By adopting the coupling method of the present invention, the operating conditions of the coarse separation tower: the temperature is -20°C, and the pressure is 0.6 MPaG. See Table 1 for specific data. Compared with Comparative Example 3, 861,300 tons of naphtha was reduced per year, and the production of propylene was increased by 199,300 tons per year.

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Abstract

The invention relates to an MTO process and naphtha cracking sequence separating process coupling method which is mainly used for solving the problems of unreasonable process design, relatively high investment and relatively low raw material product benefit in the traditional coupling technology. The problems are better solved through the technical scheme that the MTO process and naphtha cracking sequence separating process coupling method comprises the steps of compressing and drying MTO product gas, and then, enabling the compressed and dried MTO product gas to enter a crude separating tower; enabling a material flow which comprises components lower than C2 and parts of C3 components and is located at the top of the crude separating tower to enter a cold box provided in a naphtha cracking sequence separating process; enabling a material flow which comprises the rest C3 components and components higher than C4 and is located in the crude separating tower to enter a depropanizer provided in an MTO separating process; and enabling a material flow located in the depropanizer to enter a debutanizer provided in a process for preparing ethylene through naphtha steam cracking. The MTO process and naphtha cracking sequence separating process coupling method can be used for production of low-carbon olefin.

Description

Technical field [0001] The invention relates to a method for coupling an MTO process and a naphtha cracking sequential separation process. Background technique [0002] Low-carbon olefins, namely ethylene and propylene, are two important basic chemical raw materials. At present, ethylene and propylene are mainly produced through petroleum routes, such as the technology of naphtha steam cracking to produce ethylene and propylene. US20070083071 discloses a process method for the production of ethylene and propylene by the catalytic cracking of hydrocarbons. The hydrocarbon feedstock is converted into products including low-carbon olefins in a catalytic cracking furnace, and then the product stream is separated into C2-C3 alkanes and C2-C3 through a series of processes. In the three streams of olefins and C4+ hydrocarbons, C2-C3 alkanes are returned to the tubular cracking furnace for thermal cracking, and C4+ hydrocarbons are returned to the catalytic cracking furnace for catalytic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/04C07C11/06
CPCY02P30/20Y02P30/40
Inventor 何琨徐尔玲张永生陈益
Owner SINOPEC SHANGHAI ENG