HYDROGEN SULPHIDE AND MERCAPTANS SCAVENGING COMPOSITIONS
The present invention relates to a composition for scavenging hydrogen sulphide and/or mercaptans in hydrocarbon streams, the composition comprising an oxazolidine compound and a synergistic additive.
1 - 15 . (canceled)
16 . A composition for scavenging hydrogen sulphide and mercaptans in hydrocarbon streams, said composition comprising an oxazolidine compound and an additive, said additive being a modified alkylphenol-aldehyde resin obtainable by a Mannich reaction of an alkylphenol-aldehyde condensation resin,
with at least one aldehyde and/or one ketone having 1 to 8 carbon atoms; and
at least one hydrocarbon compound having at least one alkylmonoamine or alkylpolyamine group having from 2 to 30 carbon atoms,
optionally with at least one alkylene oxide;
said alkylphenol-aldehyde condensation resin being obtainable by condensation;
of at least one alkylphenol substituted by at least one linear or branched alkyl group having 1 to 30 carbon atoms; and
at least one aldehyde and/or one ketone having 1 to 8 carbon atoms.
17 . The composition according to claim 16 , wherein the alkylphenol substituted by at least one linear or branched alkyl group having 1 to 30 carbon atoms is substituted in para position.
18 . The composition according to claim 16 , wherein aldehyde and/or a ketone is chosen from formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, 2-ethyl hexanal, benzaldehyde, or acetone.
19 . The composition according to claim 16 , wherein the hydrocarbon compound having at least one alkylmonoamine or alkylpolyamine group having from 2 to 30 carbon atoms is selected from alkylamines having at least one primary amine group.
20 . The composition according to claim 16 , wherein the modified alkylphenol-aldehyde resin is obtainable from p-nonylphenol, formaldehyde and at least one hydrocarbon compound having at least one alkylmonoamine or alkylpolyamine group having from 2 to 30 carbon atoms having at least one primary amine group, and optionally with alkylene oxide selected from ethylene oxide and propylene oxide.
21 . The composition according to claim 16 , wherein the oxazolidine compound is a selected from bisoxazolidines.
22 . The composition according to claim 16 , wherein the composition comprises from 19 to 99% wt of oxazolidine compound(s) and from 1 to 50% wt of said additive(s), based on the total weight of the composition.
23 . The composition according to claim 16 , wherein the weight ratio of oxazolidine compound(s) to said additive(s) ranges from 1 to 100.
24 . The composition according to claim 16 , further comprising a solvent.
25 . The composition according to claim 16 , comprising:
From 19 to 80% wt of oxazolidine compound(s),
From 1 to 30% wt of said additive(s), and
From 1 to 80% wt of solvent(s),
based on the total weight of the composition.
26 . Process for improving the efficiency of an oxazolidine compound for scavenging hydrogen sulphide and/or mercaptans in hydrocarbon streams, the process comprising a step of adding the additive defined in claim 16 in an oxazolidine compound.
27 . Hydrocarbon stream comprising hydrocarbons and a composition according to claim 16 .
28 . Hydrocarbon streams according to claim 27 , wherein the hydrocarbons are selected from crude oil, fuel oil, fuel, Light Petroleum Gas and natural gas.
29 . A method for scavenging hydrogen sulphide and/or mercaptan in a hydrocarbon stream, comprising contacting the hydrocarbon stream with the composition according to claim 16 .
30 . The method according to claim 29 , wherein the weight ratio between hydrogen sulphide contained in the hydrocarbon stream before the step of contacting and the composition ranges from 1:2 to 1:0.05.
31 . The composition according to claim 16 , wherein the alkylphenol substituted by at least one linear or branched alkyl group having 1 to 30 carbon atoms is p-nonylphenol.
32 . The composition according to claim 16 , wherein the hydrocarbon compound having at least one alkylmonoamine or alkylpolyamine group having from 2 to 30 carbon atoms is selected from hydrocarbon compounds compound, all the amine groups of which are primary amines.
33 . The composition according to claim 24 , wherein the solvent is present in an amount ranging from 1 to 80% wt, based on the total weight of the composition.