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Accelerating Rate Calorimetry, Differential Scanning Calorimetry And R


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#1 shvet1

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Posted 27 July 2020 - 10:37 PM

Quote (What Went Wrong? 6th ed. by Trivor Kletz)

22.1 Lack of knowledge
This is, or was at one time, the major cause of runaway reactions. After many years of safe operation, a chemical or a reaction mixture gets a little hotter than usual or is kept warm for a little longer than usual , and a runaway occurs. Today there is little excuse for such runaways, as many methods are available for testing both pure substances and reaction mixtures. They include acceleration rate calorimetry, differential scanning calorimetry, and reaction calorimetry. There are also methods for determining the size of relief valve, rupture disk, or vent required.

 

I am involved in design of 2-ethylhexyl nitrate facility which is known extremely explosive. Can anyone provide information how this chemical can be assesed as mentioned in quotation?


Edited by shvet1, 27 July 2020 - 10:37 PM.


#2 breizh

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Posted 28 July 2020 - 03:32 AM

Hi ,

Check with Mettler Toledo , they can supply these equipments (DSC , RC ,ARC ) . Normaly these data are available when you perform scale up from lab to industrial equipment . 

I added a brochure about the 2 ethyl hexyl nitrate  (best practices).

 

Hope this helping you .

Good luck

Breizh 

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#3 shvet1

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Posted 29 July 2020 - 12:01 AM

There is no problem to provide lab test (DCS, RC or ARC), moreover there is enough articles with these lab data concerning 2-ethylhexyl nitrate. The question is how this data can be converted to a relief device or explosion characteristics. The main questions are:

Q1: Is it practicable to use a relief device or decomposition of 2-ethylhexyl nitrate can not be controlled by any relief strategy.

Q2: How critical parameters of storage vessel can be calculated to assure heat dissipation. How to calculate a relief scenario in case of cooling failure.

 

There is some information in CCSP "Guidelines for Pressure Relief and Effluent Handling Systems" 1998 but it did help.

 

Mentioned chemical is well known so I am sure many have already passed this route before. I am not sure that it is efficient to provide new lab tests and modelling.


Edited by shvet1, 29 July 2020 - 12:04 AM.


#4 breizh

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Posted 29 July 2020 - 12:46 AM

https://www.research...trate_with_acid

 

Consider this paper .

Note : answers should come from the Hazop study , with mitigation in place .

 

I believe some equipments will need power back up  (strategic equipments like agitators, specific pumps , cooling towers , HVAC if any, DCS or PLC ,...) 

 

 

Breizh 


Edited by breizh, 29 July 2020 - 01:48 AM.





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