Complexation of metal ions using chelating agents within a subterranean formation can often be desirable, such as to temper the formation of metal-containing precipitates. However, many chelating agents are produced commercially in an alkali metal salt form that may not be entirely suitable for use downhole, particularly in subterranean formations containing a siliceous material. The working pH range of some types of chelating agents may also be limiting. Treatment fluids comprising an aqueous carrier fluid having an acidic pH, a sulfonated iminodialkanoic acid, and ammonium ions may at least partially address downhole precipitation issues, while providing further advantages as well. Methods for forming sulfonated iminodialkanoic acids can comprise reacting an iminodialkylnitrile with a sultone under acidic conditions to form a fluid comprising a sulfonated iminodialkanoic acid and ammonium ions.

Complexation of metal ions using chelating agents within a subterranean formation can often be desirable, such as to temper the formation of metal-containing precipitates. However, many chelating agents are produced commercially in an alkali metal salt form that may not be entirely suitable for use downhole, particularly in subterranean formations containing a siliceous material. The working pH range of some types of chelating agents may also be limiting. Treatment fluids comprising an aqueous carrier fluid having an acidic pH, a sulfonated iminodialkanoic acid, and ammonium ions may at least partially address downhole precipitation issues, while providing further advantages as well. Methods for forming sulfonated iminodialkanoic acids can comprise reacting an iminodialkylnitrile with a sultone under acidic conditions to form a fluid comprising a sulfonated iminodialkanoic acid and ammonium ions.

Complexation of metal ions using chelating agents within a subterranean formation can often be desirable, such as to temper the formation of metal-containing precipitates. However, many chelating agents are produced commercially in an alkali metal salt form that may not be entirely suitable for use downhole, particularly in subterranean formations containing a siliceous material. The working pH range of some types of chelating agents may also be limiting. Treatment fluids comprising an aqueous carrier fluid having an acidic pH, a sulfonated iminodialkanoic acid, and ammonium ions may at least partially address downhole precipitation issues, while providing further advantages as well. Methods for forming sulfonated iminodialkanoic acids can comprise reacting an iminodialkylnitrile with a sultone under acidic conditions to form a fluid comprising a sulfonated iminodialkanoic acid and ammonium ions.

A process for purifying alkanesulfonic anhydride that includes feeding a stream containing alkanesulfonic anhydride, sulfuric acid, high boilers and residual low boilers into a melt crystallization to form crystals of the alkanesulfonic anhydride suspended in mother liquor, and solid-liquid separation to remove the crystals from the mother liquor.

A process for purifying alkanesulfonic anhydride that includes feeding a stream containing alkanesulfonic anhydride, sulfuric acid, high boilers and residual low boilers into a melt crystallization to form crystals of the alkanesulfonic anhydride suspended in mother liquor, and solid-liquid separation to remove the crystals from the mother liquor.

There is disclosed a process for producing taurine by reacting 2-oxazolidinone with ammonium sulfite, or ammonium bisulfite, or a mixture of ammonium sulfite and ammonium bisulfite in an aqueous solution to form ammonium taurinate and ammonium bicarbonate. Taurine is obtained by decomposing ammonium taurinate to taurine and ammonia and recovered by solid-liquid separation.

There is disclosed a process for producing taurine by reacting 2-oxazolidinone with ammonium sulfite, or ammonium bisulfite, or a mixture of ammonium sulfite and ammonium bisulfite in an aqueous solution to form ammonium taurinate and ammonium bicarbonate. Taurine is obtained by decomposing ammonium taurinate to taurine and ammonia and recovered by solid-liquid separation.

There is disclosed a process for producing taurine by reacting 2-oxazolidinone with ammonium sulfite, or ammonium bisulfite, or a mixture of ammonium sulfite and ammonium bisulfite in an aqueous solution to form ammonium taurinate and ammonium bicarbonate. Taurine is obtained by decomposing ammonium taurinate to taurine and ammonia and recovered by solid-liquid separation.

There is disclosed a process for producing taurine by subjecting an ammonia solution ammonium isethionate in the presence of a hydrogenation catalyst and hydrogen to an ammonolysis reaction to form ammonium taurinate. Taurine is obtained by decomposing ammonium taurinate to taurine and ammonia and recovered by solid-liquid separation.

There is disclosed a process for producing taurine by subjecting an ammonia solution ammonium isethionate in the presence of a hydrogenation catalyst and hydrogen to an ammonolysis reaction to form ammonium taurinate. Taurine is obtained by decomposing ammonium taurinate to taurine and ammonia and recovered by solid-liquid separation.