Societe Francaise Hoechst

Hoechst Aktiengesellschaft

Archroma IP Gmbh

Clariant International Ltd

Frederic Mabire

Alain Blanc

Hermann Hoffmann

Rainer Nusser

Qian Tang

Didier Wilhelm

Eric Jonckheree

The instant invention relates to the Fluorochemical composition comprising a dispersion or a solution of a fluorinated compound, wherein said fluorinated compound comprises the reaction product of at least two reactants A and B wherein reactant A being a compound of formula (I);R&#x2014;O&#x2014;(CF(CF)CFO)CF(CF)&#x2014;X&#x2014;Y&#x2014;Z&#x2003;&#x2003;(I)with

Fluorochemical composition and use thereof

Use of a product of formula (I): ##STR1## in which M represents a hydrogen, lithium, sodium or potassium atom, or an NH.sub.4 group and n represents 2 or 3, as an agent for trapping hydrogen sulphide, its use for the preparation of a composition for trapping hydrogen sulphide and process for the elimination of hydrogen sulphide from a fluid.

Use of cyclic aminals of glyoxylic acid for trapping hydrogen sulphide

Process and use of decahydro pyrazino [2,3-b] pyrazine for the reduction of the proportion of free or combined hydrogen sulphide present in a fluid.

Use of decahydro pyrazino [2,3-b] pyrazine for the reduction of the

Aqueous aldehyde solutions for trapping hydrogen sulfide comprising 5 to 50% by weight of an aldehyde and 1 to 5% by weight, relative to the aldehyde solution of a formulation comprising

Aqueous aldehyde solutions for trapping hydrogen sulfide in natural gas

Water-in-oil emulsions containing by weight about:20 to 80% of a dispersed aqueous phase containing about 20 to 70% of one or more aldehydes chosen from the group constituted by formaldehyde, glyoxal, glutaraldehyde, glycolaldehyde or glyoxylic acid and 80 to 30% of an aqueous solution containing 90 to 100% water and 10 to 0% of a buffer agent pH=5.5.+-.1.5; and 80 to 20% of a continuous oil phase containing about 90 to 99 % of one or more saturated and liquid C.sub.6 -C.sub.16 hydrocarbons, and 10 to 1% of an emulsifying system constituted by one or more water-in-oil emulsifying agents and process for the elimination of hydrogen sulphide.

Water-in-oil emulsions and their use in the elimination of hydrogen

The invention concerns a process for producing cyclic ureas of the general formula (II): ##STR1## in which R is selected from the group comprising hydrogen atom and C.sub.1 -C.sub.4 alkyl radicals through condensation in aqueous medium at a pH of between 4 and 7 and at a temperature of between 40.degree. and 60.degree. C. of glyoxal with or without excess of a urea having the general formula (I):

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Arcueil, France

Frederic Mabire