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Method for safely switching C3 hydrogenation reactors for ethylene device

A technology for hydrogenation reactors and ethylene units, which is applied in chemical instruments and methods, hydrogenation hydrocarbons, carbon compound catalysts, etc., can solve the problems of poor safety and reliability, heavy operation workload, etc., and achieve improved safety and reliability, good technology Effect, effect of reducing operation workload

Inactive Publication Date: 2018-06-22
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem of large operating workload and poor safety and reliability in the prior art. A new method for safely switching the C3 hydrogenation reactor of the ethylene plant is provided, which has the advantages of small operating workload, safety and reliability good advantage

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  • Method for safely switching C3 hydrogenation reactors for ethylene device

Examples

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Embodiment 1

[0015] A method for safely switching C3 hydrogenation reactors in an ethylene plant, such as figure 1 As shown, taking the setting of 4 C3 hydrogenation reactors as an example, when C3 hydrogenation reactor 5, C3 hydrogenation reactor 6 and C3 hydrogenation reactor 7 are in normal operation and C3 hydrogenation reactor 8 During the regeneration operation, the depropanizer feed 41 from outside enters the depropanizer 1 for material rectification and separation, the C3 fraction material 42 is separated from the top of the tower, and the material 45 separated from the tower reactor is sent out of the boundary. The carbon three distillate material 42 at the top of the depropanizer 1 enters the top reflux tank 2 of the depropanizer and is completely condensed, a part of the liquid phase material is returned to the top of the depropanizer 1 as the reflux liquid 43 at the top of the depropanizer tower, and the other part of the liquid phase material 44 Enter the water collector 3 to ...

Embodiment 2

[0033] Same as [Example 1], except that the production scale is changed to 115,000 tons / year, and 2 C3 hydrogenation reactors are installed: 1 for normal operation and 1 for regeneration operation. By adopting the safe switching method of the present invention, during the mutual switching process of the two modes of the normal working condition and the regenerative working condition, the switching process takes 0.1 second, and the safety and reliability are good, and the operation workload is small. The C3 fraction after hydrogenation undergoes subsequent separation and purification to obtain propylene content ≥ 99.6 mol%, propyne content ≤ 5 × 10 -6 mol, propadiene content≤5×10 -6 mol of polymer grade propylene products.

Embodiment 3

[0037] Same as [Example 1], only the production scale is changed to 1 million tons / year, and 3 C3 hydrogenation reactors are installed: 2 are in normal operation and 1 is in regeneration operation. By adopting the safe switching method of the present invention, during the mutual switching process of the two modes of the normal working condition and the regenerative working condition, the switching process takes 0.1 second, and the safety and reliability are good, and the operation workload is small. The C3 fraction after hydrogenation undergoes subsequent separation and purification to obtain propylene content ≥ 99.6 mol%, propyne content ≤ 5 × 10 -6 mol, propadiene content≤5×10 -6 mol of polymer grade propylene products.

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Abstract

The invention relates to a method for safely switching C3 hydrogenation reactors for an ethylene device, and mainly solves the problems of heavy operation workload and poor security reliability in theprior art. Through adoption of the method for safely switching the C3 hydrogenation reactors for the ethylene device disclosed by the invention, a normal operation and a regeneration working condition of each of the C3 hydrogenation reactors are switched by using one key, so that an interlocking function is kept, a manual operation is not needed, the time of switching between the normal operationand the regeneration working condition is reduced from 60 to 180 seconds to 0.1 second; hydrogenated C3 distillate fractions are separated again to obtain a polymerization grade propylene product ofwhich propylenecontent is more than or equal to 99.6 mol percent, propyne content is less than or equal to 5*10<-6>mol and propadiene content is less than or equal to 5*10<-6>mol. According to the technical scheme, the problems are solved preferably, and the method can be used for safely switching the C3 hydrogenation reactors for the ethylene device.

Description

technical field [0001] The invention relates to a method for safely switching a C3 hydrogenation reactor of an ethylene plant. Background technique [0002] In the production of ethylene plants, the C3 fraction contains 1-5 mol% of propyne and propadiene that need to be removed. Generally, liquid-phase post-hydrogenation technology is used, and hydrogenation is carried out in a gas, liquid, and solid three-phase trickle bed reactor. Hydrogen reaction to convert propyne and propadiene into propylene, ensuring that the content of propyne and propadiene in polymer grade propylene products is ≤5×10 -6 mol. CN201520902811.0 in the prior art is a system for improving the hydrogenation selectivity of carbon triacetylenes in an ethylene plant, which discloses a system for hydrogenation selectivity of carbon triacetylenes to improve the selectivity of carbon triacetylene hydrogenation reactors, improve Economic benefits; CN200910259974.0 A cooling protection system for a mixed atom...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C5/09C07C5/05
CPCC07C5/05C07C5/09C07C2523/44C07C11/06
Inventor 张斌吕世军孙丽丽殷家云何琨
Owner SINOPEC SHANGHAI ENG
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