A method for preparing high-purity taurine and salt by reacting ethylene oxide with bisulfite to generate isethionate, performing an ammonolysis reaction on the isethionate in combination with ammonia and a metal salt, evaporating the reaction solution and subjecting the concentrated solution to ion exchange to obtain an adsorption solution, extracting taurine from the adsorption solution, eluting adsorbed metal cations from the ion exchange system by an acid, and separately collecting the eluate containing a salt.

A method for preparing high-purity taurine and salt by reacting ethylene oxide with bisulfite to generate isethionate, performing an ammonolysis reaction on the isethionate in combination with ammonia and a metal salt, evaporating the reaction solution and subjecting the concentrated solution to ion exchange to obtain an adsorption solution, extracting taurine from the adsorption solution, eluting adsorbed metal cations from the ion exchange system by an acid, and separately collecting the eluate containing a salt.

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.

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.

A surfactant of formula (I) ##STR00001## wherein each of R.sub.1 and R.sub.2 are independently a hydrogen, an optionally substituted alkyl, an optionally substituted cycloalkyl, or an optionally substituted arylalkyl, R.sub.3 and R.sub.4 are independently an optionally substituted alkyl, an optionally substituted cycloalkyl, or an optionally substituted arylalkyl, x is an integer in a range of 2-8, y is an integer in a range of 1-15, z is an integer in a range of 4-10, n is an integer in a range of 2-5, and A is one of a carboxybetaine group, a sulfobetaine group, or a hydroxy sulfobetaine group. An oil and gas well servicing fluid containing the surfactant and methods of servicing an oil and gas well are also described.

The present invention provides photo-cleavable anionic surfactants, particularly 4-hexylphenylazosulfonate (Azo) and sodium 4-hexylphenylazosulfonate derivatives, which can be rapidly degraded upon UV irradiation, for top-down and bottom-up proteomics. These surfactants can effectively solubilize proteins and peptide fragments with performance comparable to sodium dodecyl sulfate (SDS) and are compatible with mass spectrometry analysis of the solubilized proteins and peptide fragments. Top-down proteomic studies using the present photo-cleavable anionic surfactants has allowed the detection of 100-fold more unique proteoforms as compared to controls and has enabled the solubilization of membrane proteins for comprehensive characterization of protein post-translational modifications. In addition, the present photo-cleavable anionic surfactants are also suitable for dissolving polypeptides in bottom-up proteomic experiments including extracellular matrix proteomics, and are suitable as a substitute for SDS in gel electrophoresis.

A method is disclosed for the production of taurine in high yield by a cyclic process of reacting monoethanolamine, sulfuric acid, and ammonium sulfite in the presence of additives to inhibit the hydrolysis of 2-aminoethyl hydrogen sulfate intermediate. The cyclic process is economical and little waste is generated.

A method is disclosed for the production of taurine in high yield by a cyclic process of reacting monoethanolamine, sulfuric acid, and ammonium sulfite in the presence of additives to inhibit the hydrolysis of 2-aminoethyl hydrogen sulfate intermediate. The cyclic process is economical and little waste is generated.

The present disclosure relates to a method for recycling a taurine mother liquor, which includes: adding a base to the taurine mother liquor, heating to a first temperature, carrying out a hydrolysis reaction, removing ammonia produced, and evaporating and concentrating the ammonia-removed solution to obtain an alkali metal hydroxyethyl sulfonate solution. When applying the method provided by the present disclosure for the recycling of the taurine mother liquor, the taurine mother liquor can be further converted into the alkali metal hydroxyethyl sulfonate solution, impurities are removed from the obtained alkali metal hydroxyethyl sulfonate solution, the impurity-removed alkali metal hydroxyethyl sulfonate solution is concentrated and crystallized, and the alkali metal hydroxyethyl sulfonate is separated out. The method provided by the present disclosure is an efficient and simple method for recycling the taurine mother liquor, which is very easy to implement industrially and can effectively recycle the taurine mother liquor.

The present disclosure relates to a method for recycling a taurine mother liquor, which includes: adding a base to the taurine mother liquor, heating to a first temperature, carrying out a hydrolysis reaction, removing ammonia produced, and evaporating and concentrating the ammonia-removed solution to obtain an alkali metal hydroxyethyl sulfonate solution. When applying the method provided by the present disclosure for the recycling of the taurine mother liquor, the taurine mother liquor can be further converted into the alkali metal hydroxyethyl sulfonate solution, impurities are removed from the obtained alkali metal hydroxyethyl sulfonate solution, the impurity-removed alkali metal hydroxyethyl sulfonate solution is concentrated and crystallized, and the alkali metal hydroxyethyl sulfonate is separated out. The method provided by the present disclosure is an efficient and simple method for recycling the taurine mother liquor, which is very easy to implement industrially and can effectively recycle the taurine mother liquor.