Please advise estimated rate of depletion with time of the MeHQ inhibitor dissolved in 1000 metric tons of n-butyl acrylate (at 28 mg/kg) in the process of transportation by an ocean chemical tanker from China to Egypt (external temperature up to 45 C) and further storage in a shore tank in Egypt (external temperature up to 30 C).
Dear Mikhail,
sorry to see that your very interesting technical question has not yet received any expert answers. We are synthetic inorganic chemists, so I'm certainly not an expert enough to provide you with a qualified answer. All I know is that MEHQ (= methylhydroquinone or p-methoxyphenol) is thermally rather stable as it has a boiling point of 243–244 °C at normal pressure. According to the manual cited below it is important to maintain a certain oxygen content. As soon as all oxygen is consumed, the inhibitor will lose its activity and the polymerization of n-butylacrylate can start. Thus the inhibition effect of MEHQ can only be operative in the presence of sufficient oxygen. For more detaild information please have a look at the following handbook:
SAFE HANDLING AND STORAGE OF ACRYLIC ESTERS
https://www.petrochemistry.eu/wp-content/uploads/2018/04/AE-guidelines-final-01-2016-blocked-version-2.pdf
(please see attached pdf file)
Good luck with your work!
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