w*****u
发帖数: 857 | 1 今天在路上开车忽然谈起了柴油和汽油区别啊之类的，然后就说到了燃烧热。LD问，你
知道汽油燃烧热以哪种烷烃为标准吗。我，应该是辛烷还是焿烷吧。然后LD说，辛烷是
几个碳，焿烷是几个碳？我还在努力的回忆到底是辛烷还是焿烷中，就看到LD一边掰着
手指头，一边欢快的念: 子丑寅卯... |
w*x
发帖数: 3456 | |
w********h
发帖数: 12367 | 3 甲乙丙丁戊己庚辛
【在 w*x 的大作中提到】
: 最后数到那个字了？
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p*****r
发帖数: 805 | 4 赞有内涵的笑话~
【在 w*****u 的大作中提到】
: 今天在路上开车忽然谈起了柴油和汽油区别啊之类的，然后就说到了燃烧热。LD问，你
: 知道汽油燃烧热以哪种烷烃为标准吗。我，应该是辛烷还是焿烷吧。然后LD说，辛烷是
: 几个碳，焿烷是几个碳？我还在努力的回忆到底是辛烷还是焿烷中，就看到LD一边掰着
: 手指头，一边欢快的念: 子丑寅卯...
|
v*****s
发帖数: 20290 | 5 赞冷笑话。
【在 w*****u 的大作中提到】
: 今天在路上开车忽然谈起了柴油和汽油区别啊之类的，然后就说到了燃烧热。LD问，你
: 知道汽油燃烧热以哪种烷烃为标准吗。我，应该是辛烷还是焿烷吧。然后LD说，辛烷是
: 几个碳，焿烷是几个碳？我还在努力的回忆到底是辛烷还是焿烷中，就看到LD一边掰着
: 手指头，一边欢快的念: 子丑寅卯...
|
A*******l
发帖数: 67 | 6 哈哈哈……子丑寅卯……
【在 w*****u 的大作中提到】
: 今天在路上开车忽然谈起了柴油和汽油区别啊之类的，然后就说到了燃烧热。LD问，你
: 知道汽油燃烧热以哪种烷烃为标准吗。我，应该是辛烷还是焿烷吧。然后LD说，辛烷是
: 几个碳，焿烷是几个碳？我还在努力的回忆到底是辛烷还是焿烷中，就看到LD一边掰着
: 手指头，一边欢快的念: 子丑寅卯...
|
A**u
发帖数: 701 | |
w*****u
发帖数: 857 | 8 感谢版主喜欢，感谢“我们这儿”博大精深的文化，我终于吃上包子了，哈哈
【在 v*****s 的大作中提到】
: 赞冷笑话。
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w*2
发帖数: 252 | 9 这个笑话冷。不过我也是最近去面试才知道所谓辛烷值并不是说汽油里面的八碳烷烃的
比例。。。以前以为所谓重整催化是把不是八碳的搞成八碳。。。想说这个过程太NB了。
【在 w*****u 的大作中提到】
: 今天在路上开车忽然谈起了柴油和汽油区别啊之类的，然后就说到了燃烧热。LD问，你
: 知道汽油燃烧热以哪种烷烃为标准吗。我，应该是辛烷还是焿烷吧。然后LD说，辛烷是
: 几个碳，焿烷是几个碳？我还在努力的回忆到底是辛烷还是焿烷中，就看到LD一边掰着
: 手指头，一边欢快的念: 子丑寅卯...
|
S*****n
发帖数: 6055 | 10 OK
Since ppl in this building is so willing to talk/learn about chemistry, I am
offering baozi for the following question for first 3 correct answers:
From chemistry aspect, what are the major differences between gasoline and
diesel powered vehicles?
【在 w*****u 的大作中提到】
: 今天在路上开车忽然谈起了柴油和汽油区别啊之类的，然后就说到了燃烧热。LD问，你
: 知道汽油燃烧热以哪种烷烃为标准吗。我，应该是辛烷还是焿烷吧。然后LD说，辛烷是
: 几个碳，焿烷是几个碳？我还在努力的回忆到底是辛烷还是焿烷中，就看到LD一边掰着
: 手指头，一边欢快的念: 子丑寅卯...
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|
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L*******r
发帖数: 5448 | 11 吃包子
am
【在 S*****n 的大作中提到】
: OK
: Since ppl in this building is so willing to talk/learn about chemistry, I am
: offering baozi for the following question for first 3 correct answers:
: From chemistry aspect, what are the major differences between gasoline and
: diesel powered vehicles?
|
c**t
发帖数: 244 | 12 燃烧完全程度不同？
am
【在 S*****n 的大作中提到】
: OK
: Since ppl in this building is so willing to talk/learn about chemistry, I am
: offering baozi for the following question for first 3 correct answers:
: From chemistry aspect, what are the major differences between gasoline and
: diesel powered vehicles?
|
S*****n
发帖数: 6055 | 13 partialy correct
【在 c**t 的大作中提到】
: 燃烧完全程度不同？
:
: am
|
s*******h
发帖数: 3731 | 14 不知道。。。
am
【在 S*****n 的大作中提到】
: OK
: Since ppl in this building is so willing to talk/learn about chemistry, I am
: offering baozi for the following question for first 3 correct answers:
: From chemistry aspect, what are the major differences between gasoline and
: diesel powered vehicles?
|
A*******l
发帖数: 67 | 15 Considering the fact that gasoline and diesel are defined by different
ranges of b.p., I assume gasoline is composed mostly with saturated
hydrocarbon and diesel partialy with unsaturated hydrocarbon.
The bond-dissociation energy of C-C is much larger than C-H, which suggests
that oxidation of diesel gives much more energy than gasoline.
am
【在 S*****n 的大作中提到】
: OK
: Since ppl in this building is so willing to talk/learn about chemistry, I am
: offering baozi for the following question for first 3 correct answers:
: From chemistry aspect, what are the major differences between gasoline and
: diesel powered vehicles?
|
c**t
发帖数: 244 | 16 不对吧
我记得好像汽油小分子烯烃含量高些?
好像是高中化学学的
suggests
【在 A*******l 的大作中提到】
: Considering the fact that gasoline and diesel are defined by different
: ranges of b.p., I assume gasoline is composed mostly with saturated
: hydrocarbon and diesel partialy with unsaturated hydrocarbon.
: The bond-dissociation energy of C-C is much larger than C-H, which suggests
: that oxidation of diesel gives much more energy than gasoline.
:
: am
|
A*******l
发帖数: 67 | 17 In that case.... it's the other way around,but conclusion will be the same..
lol
【在 c**t 的大作中提到】
: 不对吧
: 我记得好像汽油小分子烯烃含量高些?
: 好像是高中化学学的
:
: suggests
|
S*****n
发帖数: 6055 | 18 I am listing my answers to the differences b/w gasoline and diesel powered
vehicles. I hoped to get more input but unfortunately did not see much.
Anyway I will offer baozi to the first 3 IDs who tried to answer.
1. Composition: the molecular weight of gasoline (C5-C9) is lower than
diesel (C9-C18). So in gasoline we use octane number but in diesel we use
cetane number. They both contain alkanes, alkenes (refineries try to reduce
alkenes), cyclics and aromatics. Alkanes (including cycloalkanes) are
dominant.
2. Reaction: Both are combustion reactions, but ignited differently. In
gasoline engine you need sparking plugs to ignite the fuel, while in diesel
engine the fuel/air mixture was compressed to get auto-ignition.
3. Stoichiometry: Stoichiometric reaction for gasoline engines, while air in
excess for diesel engines.
4. Products: Both includes CO2, H2O, CO, incompletely burnt hydrocarbons,
and NOx from N2+O2 at high temperature. The difference is that since diesel
has higher molecular weight, some of the incompletely burnt hydrocarbons are
in solid state (so-called particulate matter).
5. Because of the above, the catalytic converter in the tailpipe for the two
are completely different. Of course I did not expect anyone to talk about
this point...
【在 c**t 的大作中提到】
: 不对吧
: 我记得好像汽油小分子烯烃含量高些?
: 好像是高中化学学的
:
: suggests
|
S*****n
发帖数: 6055 | 19 turned out only two IDs seriously considered this question, so only two
baozi was sent out.
reduce
diesel
【在 S*****n 的大作中提到】
: I am listing my answers to the differences b/w gasoline and diesel powered
: vehicles. I hoped to get more input but unfortunately did not see much.
: Anyway I will offer baozi to the first 3 IDs who tried to answer.
: 1. Composition: the molecular weight of gasoline (C5-C9) is lower than
: diesel (C9-C18). So in gasoline we use octane number but in diesel we use
: cetane number. They both contain alkanes, alkenes (refineries try to reduce
: alkenes), cyclics and aromatics. Alkanes (including cycloalkanes) are
: dominant.
: 2. Reaction: Both are combustion reactions, but ignited differently. In
: gasoline engine you need sparking plugs to ignite the fuel, while in diesel
|
n******r
发帖数: 718 | 20 Almost all gasoline sold in the US is required by law to add 6-10% ethanol.
Diesel(including biodiesel) sold in in the US is almost purely hydrocarbons
.
There is winter gasoline and there is summer gasoline, while the diesel you
buy at different seasons is the same.
Some specialized gasoline has about 50% toluene to boost octane number and
performance.
:-)
reduce
diesel
【在 S*****n 的大作中提到】
: I am listing my answers to the differences b/w gasoline and diesel powered
: vehicles. I hoped to get more input but unfortunately did not see much.
: Anyway I will offer baozi to the first 3 IDs who tried to answer.
: 1. Composition: the molecular weight of gasoline (C5-C9) is lower than
: diesel (C9-C18). So in gasoline we use octane number but in diesel we use
: cetane number. They both contain alkanes, alkenes (refineries try to reduce
: alkenes), cyclics and aromatics. Alkanes (including cycloalkanes) are
: dominant.
: 2. Reaction: Both are combustion reactions, but ignited differently. In
: gasoline engine you need sparking plugs to ignite the fuel, while in diesel
|
S*****n
发帖数: 6055 | 21 good point!
.
hydrocarbons
you
【在 n******r 的大作中提到】
: Almost all gasoline sold in the US is required by law to add 6-10% ethanol.
: Diesel(including biodiesel) sold in in the US is almost purely hydrocarbons
: .
: There is winter gasoline and there is summer gasoline, while the diesel you
: buy at different seasons is the same.
: Some specialized gasoline has about 50% toluene to boost octane number and
: performance.
: :-)
:
: reduce
|
A*******l
发帖数: 67 | 22 I didn't know you expected such a long anser, otherwise I would have done
some searching before answering...
Thanks for baozi!
reduce
diesel
【在 S*****n 的大作中提到】
: I am listing my answers to the differences b/w gasoline and diesel powered
: vehicles. I hoped to get more input but unfortunately did not see much.
: Anyway I will offer baozi to the first 3 IDs who tried to answer.
: 1. Composition: the molecular weight of gasoline (C5-C9) is lower than
: diesel (C9-C18). So in gasoline we use octane number but in diesel we use
: cetane number. They both contain alkanes, alkenes (refineries try to reduce
: alkenes), cyclics and aromatics. Alkanes (including cycloalkanes) are
: dominant.
: 2. Reaction: Both are combustion reactions, but ignited differently. In
: gasoline engine you need sparking plugs to ignite the fuel, while in diesel
|
