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2 116 995

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Application

97110018/04, 1997-06-20

(22)

Actual filing date

1997-06-20

(45)

Published

1998-08-10

(72)

Inventor

Borejko N.P.Belokurov V.A.Zuev V.P.Serebrjakov B.R.Mustafin Kh.V.Galiev R.G.

(73)

Holder

Aktsionernoe Obshchestvo

METHOD OF INHIBITING POLYMERIZATION OF METHYLPHENYLCARBINOL DEHYDRATION PRODUCTS Russian patent published in 1998 - IPC

Abstract RU 2116995 C1

FIELD: industrial organic synthesis. SUBSTANCE: invention relates to processes of isolation of styrene from methylphenylcarbinol dehydration products. As polymerization inhibitor, mixture is used containing 3,5-di-tert-butyl-4-hydroxy- N,N-dimethylbenzylamine, alifatic carboxylic acids and quinone at ratio 1: (0.1-2):(0.0001-1), respectively. Mixture is added in quantity 100-2000 ppm based on weight of dehydration products. Quinone may be represented by 3,3,5,5-tetrabutylstilbenequinone, 3,3,5,5-tetrabutylphenoquinone, p-quinonedioxime, or their mixtures. Inhibitory composition is effective to prevent polymerization of dehydration products when being purified or rectified at temperatures up to 150 C and higher. EFFECT: optimized makeup of inhibitory mixture. 3 cl, 1 tbl

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RU 2 116 995 C1

Authors

Borejko N.P.

Belokurov V.A.

Zuev V.P.

Serebrjakov B.R.

Mustafin Kh.V.

Galiev R.G.

Dates

1998-08-10—Published

1997-06-20—Filed

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