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Method for automatically switching hydrogenation reactor before ethylene unit

An ethylene plant and automatic switching technology, applied in chemical instruments and methods, feeding devices, hydrogenation to hydrocarbons, etc., can solve the problems of poor safety and reliability, large operation workload, etc., and achieve improved safety and reliability, good technical effects, The effect of reducing the operational workload

Active Publication Date: 2020-01-14
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 problem of large operating workload and poor safety and reliability in the prior art. A new method for automatically switching the hydrogenation reactor before the ethylene plant is provided, which has the advantages of small operating workload and good safety and reliability. The advantages

Method used

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  • Method for automatically switching hydrogenation reactor before ethylene unit
  • Method for automatically switching hydrogenation reactor before ethylene unit
  • Method for automatically switching hydrogenation reactor before ethylene unit

Examples

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Embodiment 1

[0015] A method for automatically switching the pre-hydrogenation reactors of an ethylene plant, taking setting up 3 pre-hydrogenation reactors as an example. Such as figure 1 As shown, when the front hydrogenation reactor 4 and the front hydrogenation reactor 6 are in normal operation and the front hydrogenation reactor 8 is in regeneration operation, the cracked gas from outside the boundary through four stages of compression enters the high pressure depropanizer as the feed 21 of the high pressure depropanizer Tower 1 performs rectification and separation of materials, and the material 22 is separated from the top of the tower, and the material 23 is separated from the bottom of the tower and sent out of the boundary. The top material 22 of the high-pressure depropanizer 1 enters the fifth section 2 of the pyrolysis gas compressor to be pressurized to be the feed 24 of the pre-hydrogenation reactor 4, and the material 24 passes through the feed heat exchanger 3 to exchange ...

Embodiment 2

[0028] Same as [Example 1], only the production scale is changed to 1 million tons / year, and 3 pre-hydrogenation reactors are installed: 2 are in normal operation and 1 is in regeneration operation. By adopting the automatic switching method of the present invention, during the mutual switching process of the two modes of "normal working condition" and "regeneration working condition", the switching process takes 0.1 second, the operation workload is small, and the safety and reliability are good. The material after hydrogenation undergoes subsequent separation and purification to obtain ethylene content ≥ 99.95mol%, acetylene content ≤ 2×10 -6 mol polymer grade ethylene products; propylene content ≥ 99.6 mol%, propyne content ≤ 5×10 -6 mol, propadiene content≤5×10 -6 mol of polymer grade propylene products.

Embodiment 3

[0030] Same as [Example 1], except that the production scale is changed to 1.5 million tons / year, and 4 pre-hydrogenation reactors are installed: 3 are in normal operation and 1 is in regeneration operation. By adopting the automatic switching method of the present invention, during the mutual switching process of the two modes of "normal working condition" and "regeneration working condition", the switching process takes 0.1 second, the operation workload is small, and the safety and reliability are good. The material after hydrogenation undergoes subsequent separation and purification to obtain ethylene content ≥ 99.95mol%, acetylene content ≤ 2×10 -6 mol polymer grade ethylene products; 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 automatically switching a prehydrogenation reactor of an ethylene device. The method solves the problem that the prior art has large operation workload and poor safety and reliability. Through the method, the normal working condition and the regeneration condition of the prehydrogenation reactor are subjected to one-key switching, the existing safety interlockfunction is retained, manual operation is avoided and the time of the switching between the normal working condition and the regeneration condition is reduced to 0.1s from 60-180s so that the above problem is well solved. The method can be used for automatically switching a prehydrogenation reactor of an ethylene device.

Description

technical field [0001] The invention relates to a method for automatically switching a hydrogenation reactor before an ethylene unit. Background technique [0002] In the production of ethylene units, the pre-hydrogenation process of removing C2, C3-acetylenes and dienes before the cracked gas enters the demethanizer includes: pre-deethanization pre-hydrogenation, pre-depropanization pre-hydrogenation, mixing Selective hydrogenation reaction process such as hydrogenation before depropanization. CN200910080847.4 method for selective hydrogenation between cracked gas compression stages in the prior art discloses technology for reducing unsaturated hydrocarbons to reduce coking and energy consumption; CN201310114371.8 method for selective hydrogenation of carbon distillate fraction discloses The overhead distillate of the propane tower enters the adiabatic bed reactor for selective hydrogenation to remove alkynes and dienes; CN201510500998.6 prevents the method of ammonium nit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/00B01J4/00C07C5/09C07C11/04C07C11/06
CPCB01J4/008B01J19/0006B01J19/0013B01J2219/00162C07C5/09C07C2523/89C07C11/04C07C11/06
Inventor 吴德荣李真泽孙丽丽张斌何琨
Owner SINOPEC SHANGHAI ENG
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