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MEG Flash Cards > EG > Flashcards

EG Flashcards

1
Q

What is the purpose of the EG Reactor system?

A

To create EC (ethylene carbonate in the EC RX
To create EG (ethylene glycol) in the EG RX

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2
Q

What kind of reaction is the EC reaction

A

Exothermic

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3
Q

What kind of reaction is the EG reaction

A

Endothermic

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4
Q

Explain EC1 reactor

A

Converts ethylene oxide to ethylene carbonate
About 86% conversion

Feed streams:
- EO, Recycle CO2, water, EC1 recycle, Omega Catalyst

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5
Q

Explain EC2 / GDR02 reactor

A

Continues ethylene carbonate reaction to:
~98.5%
- Higher temp than EC1

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6
Q

Explain EC3 / GDR03

A
  • Resonance time
  • allows remaining EO to react with dissolved C02
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7
Q

Explain GDD05

A

Separates the liquid recycle prior to EC2 RX

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8
Q

Explain GDE08

A
  • Keeps temps high enough to continue EO conversion in EC2
  • 120 psi steam
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9
Q

Explain GDD07 / C02 Separation Vessel

A

Separates free C02 from the product streams of EC2 RX
- some goes to TOX
- The rest goes back to GDC02

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10
Q

Explain EG1 / GDR04 reactor

A
  • converts ethylene carbonate and water to ethylene glycol and CO2
  • EC conversion is about 90%
  • kettle reactor
  • runs about 290 psi
  • 120# steam
  • large amount of co2 released
  • liquid level influences the residence time in the RX and the % of EC to EG conversion
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11
Q

Explain EG2 / GDR05 reactor

A
  • continues the EC conversion to virtually 100%
  • runs around 29 psi
  • open steam injected @ 120#
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12
Q

Issues and Concerns from EC / EG side

A
  • incomplete conversion = Meg quality issues
  • Runaway reaction
  • crystallization from reduced flow
  • High pressure from EG1 to EG2
  • Largest concentration of EO (except GBD06)
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13
Q

Explain GDT01 / Glycol Dehydrator

A
  • remove water and impurities from the MEG product stream
    - water goes overhead to WW
  • column under Vacuum
  • Bottoms contains mainly MEG / 93%
  • temps over 140f glycol can boil up overhead / bad
  • water can cause off spec MEG
  • too high of temps can break down OMEGA cat
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14
Q

Explain GDT02 / Glycol bleed flasher

A

Removes heavy glycols and sodium salts from glycol bleed stream

  • under vacuum
  • sodium coms from caustic injection
  • if sodium is over 1% then its re-ran through tower
  • heat tracing is critical to prevent fouling
  • 40% surplus capacity
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15
Q

Explain GDX02 / vacuum system

A

Maintains vacuum on the overheads of GDT01 / GDT02

  • 200# steam
  • non condensable are sent to TOX
  • discharge is sent to GED03 then to WW
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16
Q

Explain GDTK02 / container first flush sump tank

A

Collects storm water and potentially contaminated drains

  • will trap the first 2” of contaminated water
  • if no leaks or oil sheen can send to WW
17
Q

Explain the MEG purification system

A
  • purify MEG to meet product specs
  • Remove OMEGA and heavy glycols (deg, teg)
  • entire process under vacuum
  • damage to catalyst / keep around 324f
    *loss of vacuum
    *financial implications due to off spec MEG
18
Q

Explain the GET01 / Meg purification column

A

Receives bottoms stream from Dehydrator
Flashes off MEG and heavy glycols

  • Bottom section: CSS
    • recovers OMEGA by flashing off glycols
    • 314* F to avoid thermal decomposition of OMEGA
    • 43% cat solution is recovered and recycled back to EC1
  • Top section (pasteurizing section)
    • separates residual water and light components from MEG
    • contains Mellapack packing
19
Q

Explain GED01 / Meg polishing Vessel

A
  • removes any traces of iron to improve the UV
  • GEFIL04 / filter removes any further traces of iron before sent to rundown tank
20
Q

Explain GETK01 / glycol slops tank

A

Storage for glycol slops during:
-S/U and S/D
-off spec

  • ATM tank with n2 blanket
  • pumps to Glycol bleed flasher GDT02 if sodium is > 1ppm
21
Q

Explain GETK02 a/b

A
  • Nitrogen blanket
  • Fill one rundown tank for 72 hours, swap tanks, sample, certify, pump OSBL
  • Product is sent OSBL, railyard, trucks or docks
22
Q

Explain GET03 / MEG side stripper

A

Further Removes MEG, sent back to GET01

-DEG and heavier go from 2% feed to 35-45% bottoms
- pulls from middle section of GET01
- overheads mostly vapor go back to GET01
-GEE05 reboiler controls temp via 200# steam

23
Q

Explain GET02 / Meg Recycle Column

A

Recovers residual MEG from the GET03 bottoms stream

  • Top product is sent to GDT01 glycol dehydrator via GEP08
  • Bottoms go to OSBL via GEP07 & GEFIL02, then cooled @ GEE08
  • TEMP control via GEE07 reboiler 200# steam
24
Q

Explain GEX01 / vacuum system

A
  • Maintains vacuum for columns in MEG purification / recycle system
  • Vacuum allows low operations temp, this minimizes MEG degradation and omega catalyst thermal decomposition.
  • # 200 steam powers multi stage ejectors system
25
Q

What 2 types of stream are in the OMEGA system

A
  • concentrated catalyst solution
  • Dilute catalyst solution
26
Q

What two Components are in the OMEGA streams

A
  • Component A: susceptible to thermal decomposition
  • Component B: susceptible to deactivation by chlorides
27
Q

Explain GDD08 / Catalyst Charge vessel

A

Used to store fresh and regenerated catalyst
- makeup catalyst is sent from this vessel to process EG2

  • LP n2 helps prevent degradation
  • during shutdowns the concentrated cat solution of the CSS is stored here
28
Q

Explain GDTK01 / Catalyst storage Tank

A

Used to store dilute OMEGA during unit shutdowns

  • large enough to store the entire system volume of the EG section plus one washing and flushing
29
Q

Explain GDD09 / catalyst drips vessel

A

Is used to collect the catalyst drain from process systems during shutdowns and equipment maintenance

  • pumps to GDTK01
  • relief from other vessels
30
Q

Explain GUTK01 / chilled water storage tank

A
  • Receives and stores chilled water for users
    • Absorb fluctuations in chilled water temp
    • Buffer capacity for stage storage during plant shutdown
31
Q

Explain GUD02 / Hot water Buffer Vessel

A
  • Absorbs fluctuations in the water temp
  • Collects the circulated hot water from users
    GDE05, GBE11
  • Make up condensate from GUD01 during start up or make up
32
Q

Explain the purpose of the Chillers / GUX01 A-J

A

to provide chilled water to users whose cooling requirements are not met by cooling water.
- required to supply water at 50f
- CHW is used to recover and condense EO
- Cool lean absorbent so that it can absorb EO
- Analyzer shelter

* 10 chillers in parallel arrangement
* Number of chillers in operation depend on demand and atmospheric conditions
33
Q

How do the Chillers work?

A

Absorption Refrigeration

  • operates on the principle of evaporating water at low pressure
  • Absorption in a lithium bromide solution
    -(strong absorbent for water)
    -(skin and eye irritant)
34
Q

What style of Trays are in GET01

A

Total Liquid Draw off

35
Q

What % (Meg, omega, other) are sent to GET01 / Meg Purification Column

A

Meg: 93%
OMEGA: 6%
DEG/other: 1%

36
Q

Explain GUD02.

Hot water Users?

A

Closed circuit hot water Buffer vessel
GDE05
GBE11 (removed)

37
Q

What does OMEGA stand for?

A

Only MEG advantage

MEG Flash Cards (1 decks)

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