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Method for efficiently switching hydrogenation reactors of MTO (methanol to olefin) device

A hydrogenation reactor, methanol-to-olefin technology, applied in chemical instruments and methods, hydrocarbon purification/separation, hydrocarbons, etc., can solve problems such as poor safety and reliability, low work efficiency, and large operating workload, and achieve Increase safety and reliability, improve work efficiency, and improve the effect of technical effects

Inactive Publication Date: 2018-07-27
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problems of low working efficiency, large operating workload and poor safety and reliability in the prior art. It provides a new method for efficiently switching the hydrogenation reactor of the methanol-to-olefins plant, which has high working efficiency, Small operating workload, good safety and reliability

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  • Method for efficiently switching hydrogenation reactors of MTO (methanol to olefin) device

Examples

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Embodiment 1

[0015] A method for efficiently switching the hydrogenation reactor of a methanol-to-olefins unit, such as figure 1 As shown, it is an example to set up two carbon dioxide hydrogenation reactors. When the C2 hydrogenation reactor 3 is in normal operation and the C2 hydrogenation reactor 4 is in regeneration operation, the deethanizer feed 21 from outside enters the deethanizer 1 for rectification and separation of materials, and the C2 is separated from the top of the tower. The distillate material 22 is separated from the tower reactor and the material 24 is sent out of the boundary. The carbon distillate material 22 at the top of the deethanizer 1 enters the top reflux tank 2 of the deethanizer for partial condensation, and the liquid phase material is returned to the top of the deethanizer 1 as the reflux liquid 23 at the top of the deethanizer, and the deethanizer is deethanized The gaseous carbon distillate at the top of the tower reflux tank 2 is used as the total feed ...

Embodiment 2

[0027] Same as [Example 1], only the ratio of ethylene / propylene in the product gas is changed to E / P=1.0:1.0, and the material composition of the product gas that needs to remove acetylene impurities is also changed, as shown in Table 2 below:

[0028] Table 2 Contains a list of acetylene impurity product gas material composition

[0029] component name

[0030] Therefore, by adopting the high-efficiency switching method of the present invention, the switching process takes 0.1 second during the mutual switching process between the normal working mode and the regenerative working mode, and the working efficiency is high, the operation workload is small, and the safety and reliability are good. The process material after hydrogenation is separated and refined to obtain ethylene content ≥ 99.95mol%, acetylene content ≤ 2×10 -6 mol of polymer grade ethylene products.

Embodiment 3

[0032] Same as [Example 1], only the ratio of ethylene / propylene in the product gas is changed to E / P=1.2:1.0, and the composition of the product gas that needs to remove acetylene impurities is also changed, as shown in Table 3 below:

[0033] Table 3 Contains a list of acetylene impurity product gas material composition

[0034] component name

[0035] Therefore, by adopting the high-efficiency switching method of the present invention, the switching process takes 0.1 second during the mutual switching process between the normal working mode and the regenerative working mode, and the working efficiency is high, the operation workload is small, and the safety and reliability are good. The process material after hydrogenation is separated and refined to obtain ethylene content ≥ 99.95mol%, acetylene content ≤ 2×10 -6 mol of polymer grade ethylene products.

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Abstract

The invention relates to a method for efficiently switching hydrogenation reactors of an MTO (methanol to olefin) device, and mainly solves the problems of low working efficiency, high operation workload and poor safe reliability in the prior art. Through the adoption of the method for efficiently switching the hydrogenation reactors of the MTO device, efficient one-key switching of an acetylene hydrogenation reactor between a normal working condition and a regeneration working condition is realized, the original interlock function is reserved, manual operation is not needed, and time for switching from the normal working condition to the regeneration working condition is reduced to 0.1 s from 60-180 s; hydrogenated process materials are subjected to further separation, according to the technical scheme, a polymer-grade ethylene product with ethylene more than or equal to 99.95mol% and acetylene less than or equal to 2*10<-6> mol is obtained, and the method can be used for switching the hydrogenation reactors of the MTO device.

Description

technical field [0001] The invention relates to a method for efficiently switching hydrogenation reactors of a methanol-to-olefins device. Background technique [0002] In the production of methanol to olefins unit, the product gas of methanol to produce ethylene, propylene and other low-carbon olefins through catalytic reaction contains acetylene and propyne impurities that need to be removed before rectification, separation and purification to obtain polymer grade ethylene products and polymer grade propylene products , The removal of acetylene and propyne impurities in the product gas usually adopts catalytic hydrogenation reaction technology. In the prior art, CN201110059244.3 is a separation process for methanol conversion to produce low-carbon olefin gases and CN201110105507.X is a separation process for low-carbon olefin gases, which disclose the use of acetylene hydrogenation reactors and propyne hydrogenation reactors A method for removing acetylene and propyne imp...

Claims

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Application Information

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IPC IPC(8): C07C7/163C07C11/04C07C11/06C07C7/00
CPCC07C7/005C07C7/167C07C11/04C07C11/06
Inventor 吴德荣何琨殷家云李真泽孙丽丽
Owner SINOPEC SHANGHAI ENG
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