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Method for recovering pressure energy of methanol-to-propylene plant

A technology of methanol to propylene and recovery method, which is applied in the field of pressure energy recovery of methanol to propylene unit, and can solve the problem of high energy consumption

Active Publication Date: 2021-05-18
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 problem of high energy consumption in the prior art, and a new method for recovering the pressure energy of the methanol-to-propylene unit is provided, which has the advantage of low energy consumption

Method used

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  • Method for recovering pressure energy of methanol-to-propylene plant

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Effect test

Embodiment 1

[0026] Taking a methanol-to-propylene plant with a production scale of 1.8 million tons per year as an example, a method for recovering pressure energy of a methanol-to-propylene plant according to the present invention is used, and the composition of the product gas generated by the methanol-to-propylene reaction is shown in Table 2.

[0027] Table 2 List of Product Gas Composition of Methanol to Propylene Plant

[0028] component name methane hydrogen Vinyl Propylene mixed carbon four light gasoline heavy gasoline carbon dioxide total Yield / wt% 2.61 2.78 65.74 4.75 13.28 10.74 0.10 100.00

[0029] Such as figure 1 As shown, the process flow is as follows: the product gas 10 after compressor compression, cooling, and gas-liquid separation enters the bottom of the absorption tower 1, and at the same time, the low-temperature lean liquid absorbent 19 after the temperature is reduced and the pressure is increased enters the top of the a...

Embodiment 2

[0033] Same as [Example 1], the production scale is still 1.8 million tons / year methanol-to-propylene unit, the process parameters remain unchanged, only the composition of the product gas generated by the reaction of the methanol-to-propylene unit is changed, as shown in Table 3.

[0034] Table 3 List of Product Gas Composition of Methanol to Propylene Plant

[0035] component name methane hydrogen Vinyl Propylene mixed carbon four light gasoline heavy gasoline carbon dioxide total Yield / wt% 2.74 2.86 66.03 4.32 14.10 9.86 0.09 100.00

[0036] By adopting a method for recovering pressure energy of a methanol-to-propylene plant of the present invention, the purified product gas after removal of acid gas CO2 is further separated and refined to obtain a polymerization-grade propylene product with an acid gas CO2 mole fraction of 4.8 ppm and a purity of ≥99.6 mol%. Save 236,900 yuan per year in electricity costs, and save 60.33% of exter...

Embodiment 3

[0038] Same as [Example 1], the production scale is still 1.8 million tons / year methanol to propylene unit, the process parameters remain unchanged, only the composition of the product gas generated by the reaction of the methanol to propylene unit is changed, see Table 4.

[0039] Table 4 List of Product Gas Composition of Methanol to Propylene Plant

[0040] component name methane hydrogen Vinyl Propylene mixed carbon four light gasoline heavy gasoline carbon dioxide total Yield / wt% 2.48 2.65 65.65 4.98 12.85 11.31 0.08 100.00

[0041] By adopting a method for recovering pressure energy of a methanol-to-propylene plant of the present invention, the product gas after removal of acid gas CO2 and purification is further separated and refined to obtain a polymer grade propylene product with a molar fraction of acid gas CO2 of 4.7 ppm and a purity of ≥99.6 mol%. The electricity cost is saved by 236,900 yuan / year, and the external energy ...

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Abstract

The invention relates to a method for recovering pressure energy of a methanol-to-propylene device, which mainly solves the problem of high energy consumption in the prior art. The present invention adopts a method for recovering the pressure energy of a methanol-to-propylene device, and a pressure recovery device is set between the absorption tower and the desorption tower, through which the rich liquid absorbent is converted from high pressure to low pressure rich liquid absorbent, and the lean The liquid absorbent is changed from low-pressure to high-pressure lean liquid absorbent, thereby relatively saving 60.10-64.74% of external energy and saving electricity costs of 236,900-473,900 yuan per year. Propylene device.

Description

technical field [0001] The invention relates to a method for recovering pressure energy of a methanol-to-propylene device. Background technique [0002] The MTP process technology of methanol to propylene has a broad application prospect of large-scale industrialization, which is in line with my country's energy utilization strategy policy. The methanol-to-propylene unit is a "bridge" combining traditional coal chemical industry and traditional petrochemical industry, and it is also the most valued and most concerned process production unit in the coal-to-olefins project. Germany Lurgi is one of the companies in the world that have successfully developed and industrialized MTP technology. The company uses molecular sieve catalysts and fixed-bed reactors provided by Southern Chemical Company. The reaction operating temperature is 380-480°C and the reaction pressure is 0.13-0.16MPa. The outlet material of the reactor first transfers part of the heat to the circulating water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14C07C1/20C07C11/06
CPCB01D53/1425B01D53/1475C07C1/20C07C11/06Y02P20/10Y02P20/151Y02P20/50Y02C20/40
Inventor 王江义白玫李真泽何琨
Owner SINOPEC SHANGHAI ENG