The invention relates to a method for producing 2-acrylamido-2-methylpropane sulfonic acid. Said method consists in reacting together acrylonitrile, fuming sulfuric acid and isobutylene. It is characterized in that the isobutylene contains less than 1000 ppm of butadiene and less than 1000 ppm of butene.

The invention relates to a method for producing 2-acrylamido-2-methylpropane sulfonic acid. Said method consists in reacting together acrylonitrile, fuming sulfuric acid and isobutylene. It is characterized in that the isobutylene contains less than 1000 ppm of butadiene and less than 1000 ppm of butene.

Mixed dimer and mixed oligomer compositions are disclosed. The mixed dimer compositions comprise a monosulfonated cross-dimer or a salt thereof. The monosulfonated cross-dimer is a reaction product of (a) an alpha-olefin sulfonic acid (AOS acid); and (b) an unsulfonated olefin, an unsulfonated olefin precursor, or a functionalized olefin. The mixed oligomer compositions comprise a mono- or polysulfonated cross-oligomer or a salt thereof. The mono- or polysulfonated cross-oligomer is a reaction product of (a) an AOS acid; and (b) an unsulfonated diolefin or an unsulfonated diolefin precursor. Various methods for making the mixed dimer or oligomer compositions are described. Salts of the mixed dimer and oligomer compositions are useful surfactants for foams used in oilfield and other applications. The foams have improved high-temperature stability when compared with foams from AOS dimer acid salts.

Mixed dimer and mixed oligomer compositions are disclosed. The mixed dimer compositions comprise a monosulfonated cross-dimer or a salt thereof. The monosulfonated cross-dimer is a reaction product of (a) an alpha-olefin sulfonic acid (AOS acid); and (b) an unsulfonated olefin, an unsulfonated olefin precursor, or a functionalized olefin. The mixed oligomer compositions comprise a mono- or polysulfonated cross-oligomer or a salt thereof. The mono- or polysulfonated cross-oligomer is a reaction product of (a) an AOS acid; and (b) an unsulfonated diolefin or an unsulfonated diolefin precursor. Various methods for making the mixed dimer or oligomer compositions are described. Salts of the mixed dimer and oligomer compositions are useful surfactants for foams used in oilfield and other applications. The foams have improved high-temperature stability when compared with foams from AOS dimer acid salts.

Provided is a precursor compound of Formula I used for preparing a cyclic sulfonic acid ester derivative compound, and a method for preparing same,

##STR00001## wherein all the variables are described herein.

Provided is a precursor compound of Formula I used for preparing a cyclic sulfonic acid ester derivative compound, and a method for preparing same,

##STR00001## wherein all the variables are described herein.

The present invention relates to a process for producing olefins, including the step of subjecting an alcohol having not less than 8 and not more than 22 carbon atoms to dehydration reaction in the presence of a solid acid catalyst, in which the solid acid catalyst includes aluminum oxide and an oxide of an element having an electronegativity higher than that of aluminum which is supported on the aluminum oxide.

The present invention relates to a process for producing olefins, including the step of subjecting an alcohol having not less than 8 and not more than 22 carbon atoms to dehydration reaction in the presence of a solid acid catalyst, in which the solid acid catalyst includes aluminum oxide and an oxide of an element having an electronegativity higher than that of aluminum which is supported on the aluminum oxide.

Haloalkane sulfonic acids and salts thereof are provided. In embodiments, a haloalkane sulfonic acid or salt thereof comprises an alkyl group, at least one sulfonic acid group, and one or more halogens selected from Cl, Br, I, and F, the haloalkane sulfonic acid having a total number of carbon atoms of from 2 to 9, and wherein if at least one F atom is present, the haloalkane sulfonic acid comprises at least one other halogen selected from Cl, Br, and I. Methods of making and using the haloalkane sulfonic acids/salts are also provided.

Haloalkane sulfonic acids and salts thereof are provided. In embodiments, a haloalkane sulfonic acid or salt thereof comprises an alkyl group, at least one sulfonic acid group, and one or more halogens selected from Cl, Br, I, and F, the haloalkane sulfonic acid having a total number of carbon atoms of from 2 to 9, and wherein if at least one F atom is present, the haloalkane sulfonic acid comprises at least one other halogen selected from Cl, Br, and I. Methods of making and using the haloalkane sulfonic acids/salts are also provided.