3 replies to this topic

[shvet1]

Hello forum
Someone having relevant experience - please advise

We are in engineering stage of a tank farm. N-methylaniline, aniline, nitrobenzene, benzene and methanol are stored in nitrogen blanketed low pressure tanks. Preliminary numbers are 4x1'000 m3 tanks, every tank is designed for storing every chemical mentioned.

Q1: Inbreathing is by N2 with O2 <0.5%v. Do we need premixing N2 with air to control O2 in the blanket lets say 5% to provoke inhibitor?
Q2: Nitrobenzene is unstable, tank has a large volume. How should we detect and manage hot spots?
Q3: Recommend drying and inerting method before / after maintenance / inspection. Water displacement is not the best one as we are limited in wastwater capacity. Cold nitrogen is the same is we have no source of liquid nitrogen.
Q4: Should outbreathing be disperced? Or treated? We have an incinerator in process site nearby but engineering contractor refuses to take vapors if those are not separated. We have bad communication, they told that have had an explosion of NB caused by ingress of a some other chemical and do not want having one more. Unlikely they provide more details. They require each vapor line shall be routed directly to burner.
Q5: Should vapor relief be disperced?
Q6: Mobile tanks unloading / loading balacing line - should we provide such?

I have no experience with such chemicals excepting methanol. Any help will be appreciated.

 

[breizh]

Hi,

If I was in your shoes, I would check with manufacturers of these Hazardous materials.

https://us.metoree.c...ategories/6387/

https://products.bas...cm/aniline.html

Nitrobenzene/benzene are carcinogenic >> vapors cannot be dispersed.

Did you check the MSDS?

Breizh

[shvet1]

Believe me - in many regions I am familiar with carcinogenic / toxicity is not an issue. If a chemical has some threshold (even Dirty Dozen have its thresholds) it is able to be dispersed somehow. E.g. I had been working with vent stack 140 meters height.

Most process fluids in a refinery / petrochemical contains carcinogenics (e.g. benzene in auto gasoline or PAH in fuel oil) but a widespread practice is to disperce those.

 

It works another way. I am seeking for one's experience. Sorry your advise is not relevant.

Edited by shvet1, 15 November 2023 - 01:02 AM.

[breizh]

Hi,

Same for your comments!

Breizh