503-40-2Relevant articles and documents
A methane disulfonic acid sub-methyl ester preparation method (by machine translation)
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Paragraph 0028-0035, (2018/12/12)
The invention discloses a methane disulfonic acid sub-methyl ester preparation method, the preparation method comprises the sulfonation reaction and dehydration condensation reaction, the sulfonation reaction is methane sulfonic acid with the sulfonating agent with the sulfonation reaction to obtain the methylene sulfonic acid; the dehydration condensation reaction is the sulfonation reaction for preparation of methylene sulfonic acid with formaldehyde compound dissolved in an organic solvent, in the presence of a dehydrating agent, carries out dehydration condensation reaction to generate methane disulfonic acid sub-methyl ester crude product, the resulting methane disulfonic acid sub-methyl ester crude product added to the water washing, drying shall get the methane disulfonic acid sub-methyl ester works. The invention relates to a methane disulfonic acid sub-methyl ester preparation method abandons the traditional to methylene sulfonic acid sodium as raw materials, by precipitation, acidification, dehydration to obtain intermediate methylene sulfonic acid. The sulfonation methane sulfonic acid directly obtained after the methylene sulfonic acid, the present invention production process is simple, and atom utilization rate high, three wastes, high yield. (by machine translation)
3,5-Dimethylpyrazole promoted sulfonation of acetic anhydride by H 2SO4 to sulfoacetic acid and methanedisulfonic acid, and crystal structures of the complexes with Co2+, Zn2+, Ba2+, Pb2+ and Cs+
Jianrattanasawat, Sarut,Mezei, Gellert
experimental part, p. 318 - 323 (2012/05/20)
Sulfuric acid can sulfonate acetic anhydride (but not acetic acid) to sulfoacetic acid, and also to methanedisulfonic acid in the presence of 3,5-dimethylpyrazole. Under the experimental conditions employed, sulfonation of 3,5-dimethylpyrazole with concentrated sulfuric acid in acetic anhydride/acetic acid as solvent leads to a mixture of approximately 47 mol% 3,5-dimethylpyrazole-4-sulfonic acid, 34 mol% sulfoacetic acid and 19 mol% methanedisulfonic acid, as determined by 1H NMR spectroscopy. The Co2+, Zn2+, Ba2+ and Pb2+ complexes of the sulfoacetate ligand, as well as the Cs+ complex of the methanedisulfonate ligand were isolated upon crystallization of the compounds obtained from the reaction of the above ligand mixture with the corresponding metal oxide or carbonate in water. Single-crystal X-ray crystallography of Co(O3SCH2CO2)(H2O)3, Zn(O3SCH2CO2)(H2O)3, Ba(O3SCH2CO2)(H2O), Pb(O 3SCH2CO2)(H2O) and Cs 2(O3SCH2SO3) reveals a variety of new coordination modes of the two sulfonated ligands within those structures.
Low pressure process for the preparation of methanedisulfonic acid alkali metal salts
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Page/Page column 2; 3, (2008/06/13)
The invention provides a process for producing alkylpolysulfonic acid alkali metal salts such as methanedisulfonic acid alkali metal salts. The process involves heating an aqueous solution of about two molar equivalents of an alkali metal sulfite to a temperature of from about 70° C. to about 90° C.; adding about one molar equivalent of a dihaloalkane to the aqueous alkali metal sulfite solution at a temperature of about 70-90° C.; and then separating the resulting alkyldisulfonic acid alkali metal salt from the reaction solution. The dihaloalkane is added at a pressure of about 1.1 atmospheres or less.
