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Coupling method of mto process and depropanization process before naphtha cracking

A naphtha and depropanization technology, which is applied in the direction of hydrocarbon cracking, hydrocarbon production from oxygen-containing organic compounds, organic chemistry, etc., can solve the problems of low benefit of raw material products, unreasonable process design, large investment, etc., and achieve reduction Investment and production costs, reduction of energy consumption, and the effect of saving investment

Active Publication Date: 2016-01-20
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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, and a new method for coupling the MTO process and the depropanization process before naphtha cracking is provided

Method used

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  • Coupling method of mto process and depropanization process before naphtha cracking

Examples

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Embodiment 1

[0021] Adopt the coupling method of the MTO process described in the present invention and the depropanization process flow before naphtha cracking, keep the 800,000 tons / year of ethylene product volume of the whole coupling flow unchanged, and the operating condition of the pre-cutting tower tower top is: the temperature is 8°C, the pressure is 2.6MPaG. The MTO reaction scale is 1.8 million tons / year, the raw material is methanol, the mass ratio of propylene to ethylene in the cracking gas is 1:2, and the mass ratio of ethylene to propylene in the MTO product gas is 0.9:1. The specific data are shown in Table 1 .

Embodiment 2

[0025] According to the conditions described in Example 1, the ethylene product volume of the entire coupling process is kept constant at 1 million tons per year, and the operating conditions at the top of the pre-cutting tower are: temperature is 0° C., and pressure is 2.0 MPaG. The MTO reaction scale is 1.8 million tons / year, the raw material is methanol, the mass ratio of propylene to ethylene in the cracking gas is 1:2, and the mass ratio of ethylene to propylene in the MTO product gas is 1:1. The specific data are shown in Table 1 .

Embodiment 3

[0029] According to the conditions described in Example 1, the ethylene product volume of the entire coupling process is kept constant at 1.2 million tons per year, and the operating conditions at the top of the pre-cutting tower are: the temperature is -2°C, and the pressure is 1.8 MPaG. The MTO reaction scale is 1.8 million tons / year, the raw material is methanol, the mass ratio of propylene to ethylene in the cracking gas is 1:2, and the mass ratio of ethylene to propylene in the MTO product gas is 1.2:1. The specific data are shown in Table 1 .

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Abstract

The invention relates to a method for coupling an MTO (Methanol to Olefins) process with a naphtha cracking front-end depropanization process, and mainly aims to solve the problems of unreasonable flow design, high investment and low raw material product efficiency in the conventional coupling technology. By adopting the method for coupling the MTO process with the naphtha cracking front-end depropanization process, MTO product gas enters a pre-cutting tower after being compressed and dried, material flow containing components having less than 2 carbon atoms and a part of components having 3 carbon atoms enters a debutanizer in a naphtha cracking front-end depropanization process flow, material flow containing the remaining components including 3 carbon atoms enters a debutanizer in an MTO separating flow, and hydrocarbon material flow containing components having over 4 carbon atoms enters a debutanizer in the naphtha cracking front-end depropanization process. By adopting the technical scheme, the problems are well solved. The method can be applied to the production of light olefins.

Description

technical field [0001] The invention relates to a method for coupling an MTO process with a depropanization process before naphtha cracking. 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 naphtha steam cracking technology to produce ethylene and propylene. US20070083071 discloses a process for producing ethylene and propylene by catalytic cracking of hydrocarbons. The hydrocarbon raw materials are converted into products including low-carbon olefins in a catalytic cracking furnace, and then the product stream is separated into C2~C3 alkanes, C2~C3 Olefins and C4+ hydrocarbons are three kinds of streams. 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 cracking, and finally ethylene and propylene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C11/04C07C1/20C07C4/04
CPCY02P30/20Y02P30/40
Inventor 张永生徐蔚辛怡陈益
Owner SINOPEC SHANGHAI ENG
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