摘要:
There is disclosed a process for recovering monoethanolamine from an aqueous mother liquor solution comprising the steps of: (a) adding excess ammonia or alkali hydroxide and a solvent to the aqueous solution comprised of monoethanolamine sulfate and at least one component selected from the group of inorganic salts consisting of ammonium sulfate, ammonium sulfite, alkali sulfite, and alkali sulfate, to precipitate the inorganic salts, wherein the alkali is lithium, sodium, or potassium; (b) separating the inorganic salts by means of a solid-liquid separation to yield an aqueous solution comprised of the monoethanolamine; and (c) distilling the solvent to yield an aqueous solution comprised of the monoethanolamine and optionally purifying the MEA by distillation. The recovered MEA is recycled to produce taurine.
摘要:
A process comprises continuously adding a first stream and a second stream to a sulfonation vessel, wherein the first stream comprises aminoethanol sulfate ester (AES) and the second stream comprises an aqueous solution of sodium sulfite (Na2SO3). The process comprises continuously mixing the AES and the aqueous solution of Na2SO3 in the sulfonation vessel, thus producing a mixture. The process comprises continuously subjecting the mixture to heat in the presence of an inert gas, thus converting the AES to the taurine via sulfonation. In an aspect, the AES has a residence time of no more than four hours in the sulfonation vessel. In an aspect the heating step is conducted at a temperature of at least 115° C and a pressure of at least 200 psi.
摘要:
The invention relates to aromatic sulfinates and sulfonyl halides, and to the preparation thereof. The halides and the sulfinates are respectively of formulae Ar-Z- (CF 2 ) n -CFR f -SO 2 Y (I) and [Ar-Z- (CF 2 ) n -CFR f -SO 2 ] m M wherein Z is a sulfide, sulfinyl or sulfonyl group; n is 0 or 1; Rf is F or a perfluoroalkyl group; Ar is an aromatic grouping; Y is Cl, Br or F; M is H, an alkaline metal, an alkaline-earth metal cation, a trivalent or tetravalent metal cation, or an organic cation. The sulfinates can be used for the preparation of sulfonyl halides which can be used for producing sulfonates and sulfonylimidides as salts for an electrolyte.
摘要:
L'invention concerne des sulfonates aromatiques, leur préparation, leur utilisation comme sel d'un électrolyte. Les sulfonates ont la formule [Ar-Z- (CF 2 ) n -CFR f -SO 3 - ] p M p+ (I). Z est un groupe sulfure, sulfinyle, ou sulfonyle. L est un groupe - (CF 2 ) n -CFR f -. n est 0 ou 1. R f est F ou un groupe perf luoroalkyle. Ar est un groupement aromatique. M représente H, un cation de métal alcalin, de métal alcalino-terreux, de métal trivalent ou tétravalent, ou un cation organique. Le procédé consiste à préparer un sulfinate (III), à transformer le sulfinate (III) en fluorure de sulfonyle (II) par réaction avec un agent de fluoration, puis à transformer le fluorure de sulfonyle (II) en sulfonate (I) par réaction avec un hydroxyde.