USE OF QUINONE METHIDES AS ANTIPOLYMERANTS FOR VINYLIC MONOMERS
申请人:Ecolab USA Inc.
公开号:US20160289147A1
公开(公告)日:2016-10-06
The present invention generally relates to compounds and methods for inhibiting the radical polymerization of unsaturated compounds, particularly vinyl monomers. More particularly, it relates to the use of cinnamyl quinone methides to inhibit the polymerization of unsaturated hydrocarbon compounds (e.g., vinyl monomers) soluble in organic solvents, particularly hydrocarbon streams.
[EN] AMINO-QUINONE ANTIPOLYMERANTS AND METHODS OF USING<br/>[FR] AGENT D'ANTIPOLYMÉRISATION À BASE D'AMINO-QUINONE ET PROCÉDÉS D'UTILISATION
申请人:ECOLAB USA INC
公开号:WO2020068735A1
公开(公告)日:2020-04-02
Described are methods and composition for inhibiting polymerization of a monomer (e.g., styrene) composition using an aminated quinone antipolymerant, such as an aminated benzoquinone or aminated naphthoquinone antipolymerant having one or more secondary or tertiary amine group(s). The aminated quinone antipolymerant can be used with little or no nitroxyl group containing antipolymerant yet still provide excellent antipolymerant activity in a monomer-containing composition.
[EN] QUINONE METHIDE AND AMMONIUM SALT ANTIPOLYMERANT COMPOSITION AND METHOD<br/>[FR] COMPOSITION D'ANTI-POLYMÈRE DE MÉTHIDE DE QUINONE ET DE SEL D'AMMONIUM, ET PROCÉDÉ
申请人:ECOLAB USA INC
公开号:WO2021072181A1
公开(公告)日:2021-04-15
Described are compositions and methods for inhibiting polymerization of a monomer (e.g., styrene) composition a quinone methide polymerization retarder and an ammonium salt. In a mixture, the ammonium salt improves the efficacy of the quinone methide polymerization retarder and provides greater antipolymerant activity. In turn, the mixture reduces or prevents apparatus fouling and improves the purity of monomer streams.
SYNTHESIS OF 7-ACETYLENO QUINONE METHIDE DERIVATIVES AND THEIR APPLICATION AS VINYLIC POLYMERIZATION RETARDERS
申请人:Masere Jonathan
公开号:US20120313036A1
公开(公告)日:2012-12-13
The invention provides a method for synthesizing 7-Acetyleno quinone methide compounds that is safe and inexpensive. The method avoids the need for extremely cold reaction temperatures and unlike the prior art does not require any highly explosive materials. The method comprises the steps of
a) performing a condensation reaction between 3,5-di-tert-butyl-4-hydroxybenzaldehyde and a secondary amine thereby forming a secondary amine quinone methide intermediate;
b) removing water from the secondary amine quinone methide intermediate by azeotropic distillation;
c) adding the dehydrated secondary amine quinone methide intermediate to an organic medium containing a metal acetylide to form a Mannich base intermediate; and
d) adding a release agent to the Mannich base intermediate to yield a 7-Acetyleno quinone methide.
申请人:EL PASO PRODUCTS COMPANY (A Delaware Corporation)
公开号:EP0186269A1
公开(公告)日:1986-07-02
Dialkenylbenzene compounds, present in t-butylstyrene in small quantities as impurities, are removed by liquid/liquid extraction using aqueous sulfolane as solvent.