Oxidation of mercaptoethanol
AssigneeThioplast Chemicals GmbH & Co. KG
InventorsMichael Zeitler, Nils Kottner, Manfred Bergfeld
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Abstract
A process for preparing dihydroxyethylene disulfide by reacting mercaptoethanol with oxygen, in which mercaptoethanol is reacted with oxygen or an oxygenous gas in the presence of ammonia and/or amines using copper salts or manganese salts.
Claims19
1-18. (canceled)
A process for preparing dihydroxyethylene disulfide by reacting mercaptoethanol with oxygen, comprising the step of reacting mercaptoethanol with oxygen or an oxygenous gas in the presence of ammonia and/or amines using copper salts or manganese salts.
The process as claimed in claim 1, wherein the copper salts used are copper(II) salts.
The process as claimed in claim 1, wherein the manganese salts used are manganese (II) salts.
The process as claimed in claim 1, wherein mercaptoethanol is initially charged and oxygen is metered into the initial charge.
The process as claimed in claim 1, wherein the reaction is carried out under a partial oxygen pressure of from 0.5 to 5 bar.
The process as claimed in claim 1, wherein the reaction is carried out under an elevated oxygen pressure of 1-5 bar.
The process as claimed in claim 1, wherein the reaction is carried out under a constant oxygen pressure.
The process as claimed in claim 1, wherein stoichiometric amount of oxygen is used for the reaction.
The process as claimed in claim 1, wherein aqueous ammonia is used.
The process as claimed in claim 1, wherein the metal salt is used dissolved in ammonia or in the amine.
The process as claimed in claim 1, wherein the reaction is carried out at from 20 to 60° C.
The process as claimed in claim 1, wherein the reaction is carried out in the absence of organic solvents.
The process as claimed in claim 1, wherein the reaction is carried out in an aqueous medium.
Dependencies are inferred from the claim text.