Composition and method for inhibiting polymerization and polymer growth
a technology polymerization inhibition, which is applied in the direction of thermal non-catalytic cracking, separation processes, fuels, etc., can solve the problems of loss of monomers, reduced yield, undetectable polymerization of ethylenically unsaturated monomers, etc., to prevent polymer growth, the effect of preserving and utilizing the effectiveness of nitroxyl radical inhibitors
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Procedure for Polymer Growth Reboiler Test Preparation of Feed Solution
[0174] Tert-butylcatechol (TBC) is removed from commercially available styrene by distillation under vacuum. Removal of TBC is verified by caustic titration. The desired amount of inhibitor(s) is added to this TBC-free styrene either directly or by first making a concentrated solution of the inhibitor in TBC-free styrene followed by further dilution with TBC-free styrene.
Procedure for Polymer Growth Dynamic Reboiler Test
[0175] A quantity of the Feed Solution containing inhibitor or blend of inhibitors at the desired charge (stated as a wt / wt total inhibitor to styrene) is added to a round-bottom flask (the Pot). A known quantity of insoluble polymer capable of growing via a living mechanism is placed inside the Pot and submersed in the Feed Solution in the Pot. The insoluble polymer can be retained in the Pot by any suitable means. Typically, the insoluble polymer is securely wrapped in a piece of filter paper...
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