Richter Gedeon Nyrt.

Mol Magyar Olaj- És Gázipari Nyilvánosan Működő Részvénytársaság

Mol Magyar Olaj És Gázipari Nyilvánosan Müködörészvénytársaág

József Dudás

Árpád Vágó

László Bartha

Roland Nagy

Mária Törö

Sándor Puskás

István János Lakatos

László Borbély

Péter Jekkel

István Lakatos

András Vass

Ferenc Haász

The present invention relates to a composition for an enhanced oil recovery process, said composition comprising

Polymer-surfactant compositions for enhanced oil recovery process

The anionic cocogem surfactant of formula (I) for an oil production process of increased efficiency wherein

Surfactants for enhanced oil recovery

The invention relates to a process for the preparation of a phenolic hydroxy-substituted compound of the general formula (I) by desalkylation of an alkyl aryl ether of the general formula (II) by treatment with a thiourea/aluminum chloride reagent pair, in said general formulae Rstands for straight chain or branched Calkyl group; R, R, R, R, and Rhave the same or different meanings and stand for hydrogen or halogen atom, hydroxy, carboxy, nitro, oxo, Calkylcarbonyl, straight chain or branched alkyl or -alkoxy, or aryl group, or Rand Rtogether stand for a 5-7 membered ring or fused ring system; said 5-7 membered ring may be a partially saturated ring optionally substituted with an oxo group or can be an unsaturated ring; or said fused ring system may constitute with the first ring a steroid, preferably an estratriene derivative optionally substituted with an oxo or Calkylcarbonyloxy group in the 17 position. 

Process for the preparation of phenolic hydroxy-substituted compounds

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Veszprém, Hungary

József Dudás