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The '''OMEGA''' process (''only mono ethylene glycol advanced process'') is a process of the [[Royal Dutch Shell]] to produce [[ethylene glycol | Mono-ethylenlglycol]] from [[ethylene oxide]], [[carbon dioxide]] as [[catalyst]] and water with high [[selectivity]].
This is a preview for the new '''MathML rendering mode''' (with SVG fallback), which is availble in production for registered users.


== Process ==
If you would like use the '''MathML''' rendering mode, you need a wikipedia user account that can be registered here [[https://en.wikipedia.org/wiki/Special:UserLogin/signup]]
The traditional process of [[monoethylene glycol]] (MEG) production is by reaction of ethylene oxide with water. The product of the first reaction stage, MEG, reacts with ethylene oxide on to [[di-|diethylene glycol]] and [[triethylene glycol]], which makes a [[distillation]] work-up necessary. The selectivity to MEG is about 90%.
* Only registered users will be able to execute this rendering mode.
* Note: you need not enter a email address (nor any other private information). Please do not use a password that you use elsewhere.


In the OMEGA process, the ethylene oxide is first converted with [[carbon dioxide]] (CO<sub>2</sub>) to [[ethylene carbonate]] to then react with water in a second step to selectively produce [[monoethylene glycol]]. The carbon dioxide is released in this step again and can be fed back into the process circuit. The carbon dioxide comes in part from the ethylene oxide production, where a part of the [[ethylene]] is completely [[oxidation|oxidized]].
Registered users will be able to choose between the following three rendering modes:


(1) <math>{C_2H_4O + CO_2 \longrightarrow C_3H_4O_3}</math>
'''MathML'''
: <small> Ethylene oxide reacts with carbon dioxide to ethylene carbonate</small>.
:<math forcemathmode="mathml">E=mc^2</math>


(2) <math>{C_3H_4O_3 + H_2O \longrightarrow HO{-}C_2H_4{-}OH + CO_2}</math>
<!--'''PNG'''  (currently default in production)
: <small> ethylene carbonate reacts with water to (mono) ethylene glycol and carbon dioxide </small>.
:<math forcemathmode="png">E=mc^2</math>


The selectivity to MEG is approximately 99.5%.
'''source'''
:<math forcemathmode="source">E=mc^2</math> -->


MEG is mainly used for the production [[polyethylene terephthalate]] and is also used a [[corrosion inhibitor]] in refrigerants.
<span style="color: red">Follow this [https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering link] to change your Math rendering settings.</span> You can also add a [https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering-skin Custom CSS] to force the MathML/SVG rendering or select different font families. See [https://www.mediawiki.org/wiki/Extension:Math#CSS_for_the_MathML_with_SVG_fallback_mode these examples].


A large-scale plant with 750,000 tonnes annual capacity was put in operation in 2009. <ref> [http://marketpublishers.de/lists/6226/news.html shell starts up MEG plant in Singapore]</ref>
==Demos==


== References ==
Here are some [https://commons.wikimedia.org/w/index.php?title=Special:ListFiles/Frederic.wang demos]:
{{Reflist}}


==External links==
* [http://www.shell.com/static/globalsolutions-en/downloads/knowledge_centre/pres_speeches_papers/2006/techpersptv_eijsberg.pdf description of Shell OMEGA process]


[[Category:Chemical processes]]
* accessibility:
** Safari + VoiceOver: [https://commons.wikimedia.org/wiki/File:VoiceOver-Mac-Safari.ogv video only], [[File:Voiceover-mathml-example-1.wav|thumb|Voiceover-mathml-example-1]], [[File:Voiceover-mathml-example-2.wav|thumb|Voiceover-mathml-example-2]], [[File:Voiceover-mathml-example-3.wav|thumb|Voiceover-mathml-example-3]], [[File:Voiceover-mathml-example-4.wav|thumb|Voiceover-mathml-example-4]], [[File:Voiceover-mathml-example-5.wav|thumb|Voiceover-mathml-example-5]], [[File:Voiceover-mathml-example-6.wav|thumb|Voiceover-mathml-example-6]], [[File:Voiceover-mathml-example-7.wav|thumb|Voiceover-mathml-example-7]]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-Audio-Windows7-InternetExplorer.ogg Internet Explorer + MathPlayer (audio)]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-SynchronizedHighlighting-WIndows7-InternetExplorer.png Internet Explorer + MathPlayer (synchronized highlighting)]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-Braille-Windows7-InternetExplorer.png Internet Explorer + MathPlayer (braille)]
** NVDA+MathPlayer: [[File:Nvda-mathml-example-1.wav|thumb|Nvda-mathml-example-1]], [[File:Nvda-mathml-example-2.wav|thumb|Nvda-mathml-example-2]], [[File:Nvda-mathml-example-3.wav|thumb|Nvda-mathml-example-3]], [[File:Nvda-mathml-example-4.wav|thumb|Nvda-mathml-example-4]], [[File:Nvda-mathml-example-5.wav|thumb|Nvda-mathml-example-5]], [[File:Nvda-mathml-example-6.wav|thumb|Nvda-mathml-example-6]], [[File:Nvda-mathml-example-7.wav|thumb|Nvda-mathml-example-7]].
** Orca: There is ongoing work, but no support at all at the moment [[File:Orca-mathml-example-1.wav|thumb|Orca-mathml-example-1]], [[File:Orca-mathml-example-2.wav|thumb|Orca-mathml-example-2]], [[File:Orca-mathml-example-3.wav|thumb|Orca-mathml-example-3]], [[File:Orca-mathml-example-4.wav|thumb|Orca-mathml-example-4]], [[File:Orca-mathml-example-5.wav|thumb|Orca-mathml-example-5]], [[File:Orca-mathml-example-6.wav|thumb|Orca-mathml-example-6]], [[File:Orca-mathml-example-7.wav|thumb|Orca-mathml-example-7]].
** From our testing, ChromeVox and JAWS are not able to read the formulas generated by the MathML mode.


[[de:OMEGA-Prozess]]
==Test pages ==
 
To test the '''MathML''', '''PNG''', and '''source''' rendering modes, please go to one of the following test pages:
*[[Displaystyle]]
*[[MathAxisAlignment]]
*[[Styling]]
*[[Linebreaking]]
*[[Unique Ids]]
*[[Help:Formula]]
 
*[[Inputtypes|Inputtypes (private Wikis only)]]
*[[Url2Image|Url2Image (private Wikis only)]]
==Bug reporting==
If you find any bugs, please report them at [https://bugzilla.wikimedia.org/enter_bug.cgi?product=MediaWiki%20extensions&component=Math&version=master&short_desc=Math-preview%20rendering%20problem Bugzilla], or write an email to math_bugs (at) ckurs (dot) de .

Latest revision as of 23:52, 15 September 2019

This is a preview for the new MathML rendering mode (with SVG fallback), which is availble in production for registered users.

If you would like use the MathML rendering mode, you need a wikipedia user account that can be registered here [[1]]

  • Only registered users will be able to execute this rendering mode.
  • Note: you need not enter a email address (nor any other private information). Please do not use a password that you use elsewhere.

Registered users will be able to choose between the following three rendering modes:

MathML


Follow this link to change your Math rendering settings. You can also add a Custom CSS to force the MathML/SVG rendering or select different font families. See these examples.

Demos

Here are some demos:


Test pages

To test the MathML, PNG, and source rendering modes, please go to one of the following test pages:

Bug reporting

If you find any bugs, please report them at Bugzilla, or write an email to math_bugs (at) ckurs (dot) de .

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