The present invention relates to a method of carrying out an organic reaction in aqueous solution in the presence of a hydroxyalkyl(alkyl)cellulose or an alkylcellulose.

There is described a method of reducing polymer tar build-up in the production of methyl methacrylate and/or methacrylic acid by the acetone cyanohydrin process. In the method a stabiliser is contacted with the amide stage reaction medium. The stabiliser includes a hydrocarbon moiety capable of donating a labile hydrogen atom to a methacrylamide derivative capable of reaction with said labile hydrogen atom under the conditions in the said medium. The method herein is especially useful for the continuous production of methyl methacrylate and/or methacrylic acid.

There is described a method of reducing polymer tar build-up in the production of methyl methacrylate and/or methacrylic acid by the acetone cyanohydrin process. In the method a stabiliser is contacted with the amide stage reaction medium. The stabiliser includes a hydrocarbon moiety capable of donating a labile hydrogen atom to a methacrylamide derivative capable of reaction with said labile hydrogen atom under the conditions in the said medium. The method herein is especially useful for the continuous production of methyl methacrylate and/or methacrylic acid.

A method for stabilizing a sanshool compound is provided. The method for stabilizing a sanshool compound comprises a mixing step in which the sanshool compound is mixed with an antioxidant in a liquid, the liquid comprising water and/or a water-soluble organic solvent and the mixing step being conducted under the conditions of a pH of 6 or higher.

A method for stabilizing a sanshool compound is provided. The method for stabilizing a sanshool compound comprises a mixing step in which the sanshool compound is mixed with an antioxidant in a liquid, the liquid comprising water and/or a water-soluble organic solvent and the mixing step being conducted under the conditions of a pH of 6 or higher.

Aspects of the disclosure includes methods for preparing an amorphous solid composition of a fatty acid metal salt. In practicing the subject methods according to certain embodiments, a succinylated 3-(fatty acid amido)-2-hydroxy-1-(protected hydroxy)-propane organic salt is contacted with a metal base to produce a succinylated 3-(fatty acid amido)-2-hydroxy-1-(protected hydroxy)-propane metal salt; and the succinylated 3-(fatty acid amido)-2-hydroxy-1-(protected hydroxy)-propane metal salt is precipitated in a solvent to produce an amorphous solid succinylated 3-(fatty acid amido)-2-hydroxy-1-(protected hydroxy)-propane metal salt composition. An amorphous solid succinylated 3-(fatty acid amido)-2-hydroxy-1-(protected hydroxy)-propane lithium salt is also provided.

Aspects of the disclosure includes methods for preparing an amorphous solid composition of a fatty acid metal salt. In practicing the subject methods according to certain embodiments, a succinylated 3-(fatty acid amido)-2-hydroxy-1-(protected hydroxy)-propane organic salt is contacted with a metal base to produce a succinylated 3-(fatty acid amido)-2-hydroxy-1-(protected hydroxy)-propane metal salt; and the succinylated 3-(fatty acid amido)-2-hydroxy-1-(protected hydroxy)-propane metal salt is precipitated in a solvent to produce an amorphous solid succinylated 3-(fatty acid amido)-2-hydroxy-1-(protected hydroxy)-propane metal salt composition. An amorphous solid succinylated 3-(fatty acid amido)-2-hydroxy-1-(protected hydroxy)-propane lithium salt is also provided.

Disclosed is a polymerization inhibitor of N-vinyl pyrrolidone monomers and use thereof. The polymerization inhibitor is selected from an inorganic weak acid potassium salt and/or an organic acid potassium salt. The polymerization inhibitor is added to N-vinyl pyrrolidone monomers, and is sealed and preserved under the protection of inert gas, wherein the addition amount of the polymerization inhibitor is 0.005-0.2% by mass with respect to the mass of the N-vinyl pyrrolidone monomers. Directly adding the polymerization inhibitor into the N-vinyl pyrrolidone monomers in proportion can inhibit the self-polymerization of the N-vinyl pyrrolidone monomers, and hence extend the shelf life. The chromaticity and toxicity of the monomers can be reduced to a great extent. The polymerization inhibitor can be used directly during solution polymerization without being removed, and does not affect the chromaticity of a polymerization solution.

The present invention relates to a method of carrying out an organic reaction in aqueous solution in the presence of a hydroxyalkyl(alkyl)cellulose or an alkylcellulose.

The present invention relates to a method of carrying out an organic reaction in aqueous solution in the presence of a hydroxyalkyl(alkyl)cellulose or an alkylcellulose.