Jan 12, 2006 08:17
18 yrs ago
1 viewer *
German term
Gleichgewichtsumsatz
German to English
Science
Chemistry; Chem Sci/Eng
3.2.3 Melaminsynthese
Der in den 1. Reaktor eintretende Harnstoff wird im Reaktor in 2 Stufen, der Ammoniakabspaltung und der Kohlendioxidabspaltung zu Melamin umgesetzt, wie im entsprechenden Kapitel zur Chemie erläutert wurde. Es handelt sich um Gleichgewichtsreaktionen, der Gleichgewichtsumsatz hängt von Druck und Temperatur ab.
Der in den 1. Reaktor eintretende Harnstoff wird im Reaktor in 2 Stufen, der Ammoniakabspaltung und der Kohlendioxidabspaltung zu Melamin umgesetzt, wie im entsprechenden Kapitel zur Chemie erläutert wurde. Es handelt sich um Gleichgewichtsreaktionen, der Gleichgewichtsumsatz hängt von Druck und Temperatur ab.
Proposed translations
(English)
| 4 | chemical equilibrium |
Ford Prefect
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| 4 -1 | (chemical) equilibrium conversion |
rainerc (X)
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Proposed translations
40 mins
Ford Prefect
Burkina Faso
Burkina Faso
Native in English
Works in field
Burkina Faso
Reassuringly expensive
Native in: English 
Works in: German to English, Italian to English, French to English
Related KudoZ points
:
63
Selected
chemical equilibrium
"...these are equilibrium reactions, with the chemical equilibrium (i.e. the final proportions of each reactant) dependent on temperature and pressure."
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Note added at 1 day 46 mins (2006-01-13 09:03:45 GMT)
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Having slept on this in the light of rainerc's comment, I think including "conversion" in the context given hinders understanding. As is often the case, translating the meaning involves more than dictionary substitution followed by rearrangement into target language syntax.
The only amendment I am inclined to make to the translation of the sentence I offered would be: "...these are equilibrium reactions, with the POINT of chemical equilibrium dependent on temperature and pressure."
As we all know, equilibrium conversion means is that the final ratio (equilibrium) of reactants and products is dependent (converted by) on other factors (in this case temperature and pressure) - this is common to most chemical reactions.
If we look at the use of Umsatz in the further context given, this clearly refers to the reaction itself (the conversion of reactants to products), and not to any change to the final ratios of products and reactants (...erreichbare Umsatz ... beträgt etwa...; Die Umsetzung findet... in 2 Stufen...).
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Note added at 1 day 46 mins (2006-01-13 09:03:45 GMT)
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Having slept on this in the light of rainerc's comment, I think including "conversion" in the context given hinders understanding. As is often the case, translating the meaning involves more than dictionary substitution followed by rearrangement into target language syntax.
The only amendment I am inclined to make to the translation of the sentence I offered would be: "...these are equilibrium reactions, with the POINT of chemical equilibrium dependent on temperature and pressure."
As we all know, equilibrium conversion means is that the final ratio (equilibrium) of reactants and products is dependent (converted by) on other factors (in this case temperature and pressure) - this is common to most chemical reactions.
If we look at the use of Umsatz in the further context given, this clearly refers to the reaction itself (the conversion of reactants to products), and not to any change to the final ratios of products and reactants (...erreichbare Umsatz ... beträgt etwa...; Die Umsetzung findet... in 2 Stufen...).
Peer comment(s):
| agree |
David Willett
: Yes, I agree, and hereby retract my suggestion. Next time I'll read my references more carfully!
56 mins
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thanks David
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| disagree |
rainerc (X)
: just 'equilibrium' does not suffice in this context
10 hrs
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And that is just an assertion - can you back it up with an argument please? Try convincing us rather than just making unsupported statements. Irrelevant references (in terrible English by non-native speakers) from the first page of google hits don't help.
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4 KudoZ points awarded for this answer.
Comment: "I wish I didn't have to choose a winning solution here, but could let you guys fight it out. Thanks!"
-1
11 hrs
(chemical) equilibrium conversion
More than just the 'equilibrium' is needed here and the 'conversion' must be included.
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Note added at 11 hrs 10 mins (2006-01-12 19:27:07 GMT)
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Assuming an equal, bimolar feed and equilibrium conversion in a normal (non-membrane)
reactor, we can define the extent of the reaction as the mole ...
www.rebresearch.com/MRessay.html
A method is proposed for predicting the equilibrium conversion for the synthesis
of monoacyl hexose ...
www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve& db=PubMed&list_uids=12675562&dopt=Abstract
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Note added at 1 day 2 hrs 19 mins (2006-01-13 10:36:26 GMT)
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The equilibrium conversion is simply the conversion of A to B at chemical equilibrium. There's really nothing more to it!
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Note added at 1 day 3 hrs 35 mins (2006-01-13 11:52:22 GMT)
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To make it more clear:
The equilibrium conversion of A is simply the conversion of A to B at chemical equilibrium as in:
The equilibrium conversion of bromine to HBr in the two processes is excellent,.
especially at temperatures below 900K. If equilibrium is achieved in the ...
www.eere.energy.gov/ hydrogenandfuelcells/pdfs/30535u.pdf
... figure 1. Extrem conditions are required for the direct equilibrium
conversion of graphite to diamond: pressures beyond 150,000 ...
www.cheque.uq.edu.au/ugrad/theses/1998/pdf/Benja.pdf
... and nitrogen decreases continuously with increasing temperature and increases with
pressure (Table 1). From Table 1 determine the equilibrium conversion of N ...
chml028.chml.ubc.ca/CHML/chml476/Assignment3.pdf
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Note added at 1 day 3 hrs 39 mins (2006-01-13 11:57:02 GMT)
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And here a German reference:
den Gleichgewichtsumsatz von Ethylbenzol unter der Annahme, dass. keine Nebenreaktionen
ablaufen. Zu Beginn der Reaktion liegen im ...
www.morbidelli-group.ethz.ch/ education/hrt/hrt2003/ubung2003-04.pdf
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Note added at 11 hrs 10 mins (2006-01-12 19:27:07 GMT)
--------------------------------------------------
Assuming an equal, bimolar feed and equilibrium conversion in a normal (non-membrane)
reactor, we can define the extent of the reaction as the mole ...
www.rebresearch.com/MRessay.html
A method is proposed for predicting the equilibrium conversion for the synthesis
of monoacyl hexose ...
www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve& db=PubMed&list_uids=12675562&dopt=Abstract
--------------------------------------------------
Note added at 1 day 2 hrs 19 mins (2006-01-13 10:36:26 GMT)
--------------------------------------------------
The equilibrium conversion is simply the conversion of A to B at chemical equilibrium. There's really nothing more to it!
--------------------------------------------------
Note added at 1 day 3 hrs 35 mins (2006-01-13 11:52:22 GMT)
--------------------------------------------------
To make it more clear:
The equilibrium conversion of A is simply the conversion of A to B at chemical equilibrium as in:
The equilibrium conversion of bromine to HBr in the two processes is excellent,.
especially at temperatures below 900K. If equilibrium is achieved in the ...
www.eere.energy.gov/ hydrogenandfuelcells/pdfs/30535u.pdf
... figure 1. Extrem conditions are required for the direct equilibrium
conversion of graphite to diamond: pressures beyond 150,000 ...
www.cheque.uq.edu.au/ugrad/theses/1998/pdf/Benja.pdf
... and nitrogen decreases continuously with increasing temperature and increases with
pressure (Table 1). From Table 1 determine the equilibrium conversion of N ...
chml028.chml.ubc.ca/CHML/chml476/Assignment3.pdf
--------------------------------------------------
Note added at 1 day 3 hrs 39 mins (2006-01-13 11:57:02 GMT)
--------------------------------------------------
And here a German reference:
den Gleichgewichtsumsatz von Ethylbenzol unter der Annahme, dass. keine Nebenreaktionen
ablaufen. Zu Beginn der Reaktion liegen im ...
www.morbidelli-group.ethz.ch/ education/hrt/hrt2003/ubung2003-04.pdf
Peer comment(s):
| disagree |
Ford Prefect
: see comments in my answer for detailed reasons///So you are saying there is NET (A to B) conversion to product at chemical equilibrium??? IMO conversion (if any) at chemical equilibrium is bidirectional and balanced. Otherwise it's not at equilibrium.
13 hrs
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I fail to see the irrelevance of my references. They clearly use the term 'conversion' in the same context as heimo's text.
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Discussion
Die Kinetik beantwortet die Frage, welche Zeit es braucht, das Gleichgewicht zu erreichen. Sie konnte f�r die Ammoniakabspaltung und die Kohlendioxidbildung grob abgesch�tzt werden:
Die Umsetzung findet nach einem vereinfachten Modell in 2 Stufen statt 1. Die Ammoniakfreisetzung:
6 Harnstoff = 2 Cyanurs�ure + 6 Ammoniak
und 2. der Kohlendioxidfreisetzung:
2 Cyanurs�ure = Melamin + 3 Kohlendioxid
Zu den folgenden Darstellungen des zeitlichen Verlaufes ist anzumerken, dass 100 % nicht etwa vollst�ndiger Umsatz sondern Gleichgewichtsumsatz bedeuten!