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Method for coupling MTO process with front-end depropanization process of naphtha and propane pyrolysis

A naphtha and depropanization technology, which is applied in chemical instruments and methods, hydrocarbons, hydrocarbon cracking and hydrocarbon production, etc., can solve the problems of high investment in equipment engineering, long separation process of MTO device, high cost of cracking raw materials, etc., and achieve good results Effects of technical and economic effects

Inactive Publication Date: 2017-08-18
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 the high cost of cracking raw materials, low propylene output, long separation process of MTO device and high investment in equipment engineering in the existing coupling technology. Coupling method for depropanization process

Method used

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  • Method for coupling MTO process with front-end depropanization process of naphtha and propane pyrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The method of coupling the MTO process of the present invention with the depropanization process before naphtha and propane cracking is adopted, and the separation technology of the ethylene unit adopts the pre-depropanization process flow, and the ethylene output of the entire coupling process is kept constant at 800,000 tons / year. like figure 1As shown, the coupling method of the present invention is adopted: the methanol raw material 101 of the MTO device first enters the MTO device reaction unit 300, and in the MTO reaction unit 300, after the methanol raw material 101 undergoes a catalytic reaction to generate an olefin mixed gas 301, the temperature of the quenching unit 310 is reduced to The olefin mixed gas 311 is pressurized into the olefin mixed gas 401 by compression and alkali washing unit 400, and then sent to the pre-cutting tower 410 for pre-separation of the olefin mixed gas 401. The olefin mixture gas 412 of all C2 and C2 lighter components and a part o...

Embodiment 2

[0031] According to the conditions and steps described in Example 1, only the ethylene / propylene ratio of the MTO device was changed to 1:1. By adopting the process coupling method of the present invention, the propylene output is 524,100 tons / year, and the naphtha consumption is 416,300 tons / year. Compared with Comparative Example 1, the production of propylene is increased by 148,100 tons / year, the input of naphtha is reduced by 2,133,300 tons / year, and the price difference between products and raw materials can save 1.468 billion yuan / year.

Embodiment 3

[0033] According to the conditions and steps described in Example 1, only the ethylene / propylene ratio of the MTO unit was changed to 1.2:1. By adopting the process coupling method of the present invention, the propylene output is 488,100 tons / year, and the naphtha consumption is 381,600 tons / year. Compared with Comparative Example 1, the production of propylene is increased by 112,100 tons / year, the input of naphtha is reduced by 2.168 million tons / year, and the price difference between products and raw materials can save 1.668 billion yuan / year.

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Abstract

The invention relates to a method for coupling an MTO process with the front-end depropanization process of naphtha and propane pyrolysis and mainly solves the problems that the existing coupling technology is high in pyrolysis raw material cost, low in propylene yield, long in MTO device separation flow and high in equipment engineering investment. The method has the advantages that the MTO process is coupled with the front-end depropanization process under the premise that the total yield of ethylene is unchanged and by the aid of the existing separation equipment of an ethylene device, methanol and propane are used to replace most of naphtha, the yield of the propylene is increased by 38500-190200 tons / year, the use amount of the naphtha is reduced by 2095200-3842300 tons / year, product and raw material costs are saved by 1.267-2.932 billion yuan per year, the problems above are well solved, and the method is applicable to the production of low-carbon olefin.

Description

technical field [0001] The invention relates to a method for coupling an MTO process with a depropanization process before naphtha and propane cracking. Background technique [0002] my country has an energy structure of "more coal and less oil". The growth rate of oil consumption has always remained at a relatively high level. The degree of dependence on foreign countries is about 60%, and the security of energy is relatively poor. Therefore, the methanol prepared from coal in the present invention is used as a raw material for the production of low-carbon olefins to replace part of the naphtha cracking raw material refined from crude oil. To ensure the safety and reliability of my country's energy structure, and further take the road of sustainable development. [0003] Ethylene and propylene are important petrochemical basic raw materials. The ratio of propylene / ethylene produced by thermal cracking of ethylene plant is about 1:2, while the ratio of propylene / ethylene pr...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C4/04C07C7/00C07C7/04C07C11/04C07C11/06
CPCC07C1/20C07C4/04C07C7/005C07C7/04C07C11/04C07C11/06Y02P30/40Y02P30/20
Inventor 周茹英张永生何琨
Owner SINOPEC SHANGHAI ENG
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