Chemical Engineering - Petroleum Refinery Engineering - Discussion


Which is almost absent in crude petroleum?

[A]. Olefins
[B]. Mercaptans
[C]. Naphthenes
[D]. Cycloparaffins

Answer: Option A


No answer description available for this question.

Viettan K said: (Sep 20, 2014)  
Hi, please explain for me why mercaptans almost absent in crude oil. I think that crude oil contains rarely olefins. Because gas, naphtha, and kerosene which straight-run from crude distillation tower always be treated mercaptans.

Cityhunter said: (Oct 21, 2014)  
Agree with you. It should be olefins because olefins are very easy to transform to oxidation compounds.

Chinna said: (Nov 11, 2014)  
Yes you both guys are right and olefins are form in refinery process only it means olefins are absent in crude oil.

Manikannan said: (Nov 27, 2014)  
Ya correct Olefins are formed during cracking only.

Ajay said: (Jan 15, 2016)  

I am agreed from both of you, the correct answer is Olefins.

Abhay said: (Jan 23, 2016)  
Mercaptans are found especially as impurity in crude oil distillation, so why mercaptans absent?

Aba Oryina said: (Jun 29, 2016)  
Yeah, I also think it's olefins.

Aditya Sharma said: (Jul 24, 2016)  
I think it should be Olefins.

Aniket said: (Sep 27, 2016)  
I also agree the answer is option A.

Tenendra Patle said: (Oct 4, 2016)  
Yes, I also agree because olefins are intermitted product during cracking process.

Golu said: (Jan 16, 2017)  
Yes, I agree to all of you, olefins are intermitted product.

Vinay Kumar Singh said: (Jan 31, 2017)  
Olefins is the right answer.

Shivam Singh said: (Sep 6, 2017)  
Olefins is the true answer.

Richmond Fofie said: (May 9, 2018)  
Mercaptan is correct as olefin which seems to be the correct answer is absent and not almost absent.

Mercaptans which have on average 1-3% wt fraction of petroleum.

From the given option, Mercaptan is the right answer.

Vivek Shukla said: (Jul 26, 2018)  
I think, the correct answer is Olefin.

Devdutt said: (Aug 23, 2018)  
Olefin is the right answer.

Abhishek Mishra said: (Nov 8, 2019)  
We know that alkenes are mostly not present in crude petroleum. And olefin is a type of alkene. So the right answer is A, not B.

Suvamoy Ghosh said: (Feb 1, 2021)  
I don't think Olefin will be the right answer. In NHDT (Naptha Hydrotreater) diolefins are converted to olefins 1st and then olefins are transformed into straight-chain paraffin. It is then going to Isomerisation process. So, there are a lot of olefins in crude and it produces gum also.

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