27119-07-9Relevant articles and documents
NEW METHOD FOR PRODUCING 2-ACRYLAMIDO-2-METHYLPROPANE SULPHONIC ACID
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Paragraph 0123-0144, (2020/02/10)
The present invention relates to a production process for 2-acrylamido-2-methylpropane sulfonic acid including at least the following successive steps: 1) mixing of acrylonitrile with at least one compound contributing SO3 at a temperature included between ?80 and 30° C.;2) placing in contact and mixing isobutylene and the sulfonating mixture with a molar ratio of SO3 to isobutylene included between 0.2:1 and 2:1 and a molar ratio of acrylonitrile to isobutylene included between 3:1 and 60:1 at a temperature included between ?40 and 100° C.;3) solid/liquid separation of the reaction mixture and isolation of the solid particles in the form of a composition 1;4) mixing composition 1 at the end of step 3) with an aqueous solution A included at a temperature comprised between ?20 and 70° C. in order to obtain a suspension 1 of 2-acrylamido-2-methylpropane sulfonic acid crystals;5) solid/liquid separation of the suspension 1 and isolation of the crystals in form of composition 2.
A 2 - acrylamide - 2 - methyl (alkanes) sulfonic acid
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Paragraph 0025; 0026; 0027; 0028; 0029-0045; 0052, (2018/04/03)
The invention relates to a preparation method of 2-acrylamido-2-methylpropane sulfonic acid, and belongs to the field of organic synthesis and preparation. The preparation method comprises the steps of (1) adding acrylonitrile in a liquid-preparing kettle, cooling, and adding fuming sulfuric acid to obtain a mixed solution of acrylonitrile and sulfuric acid; (2) transferring partial mixed solution into a feed tank with a constant temperature for use, adding the residual mixed solution into a reaction kettle, adding an organic acid, heating, introducing isobutene, adding the standby mixed solution of acrylonitrile and sulfuric acid and controlling a temperature, a feed time and speed; (3) when isobutene is completely introduced, stirring while keeping the temperature, cooling, centrifuging or filtering to separate coarse crystals of a generated product and pumping a filtrate into a storage tank; (4) mixing the coarse crystals of the product with acrylonitrile under stirring, separating by centrifugation, drying in vacuum to obtain a product of 2-acrylamido-2-methylpropane sulfonic acid and pumping the filtrate into the storage tank; and (5) merging the filtrates, contacting the mixed filtrate with quicklime, and distilling to recycle acrylonitrile. The product provided by the invention has high purity and high polymerization activity and is liable to obtain a polymer with relatively high molecular weight.
Process for reducing sulfate ions in synthesis process of 2-acrylamido-2-methylpropanesulfonic acid
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Paragraph 0033-0060, (2017/09/13)
The invention discloses a process for reducing sulfate ions in the synthesis process of 2-acrylamido-2-methylpropanesulfonic acid. The process comprises the following steps: (1) firstly, adding certain parts of acrylonitrile and a dehydrant into a reaction kettle, and supplying cooling water to cool to minus 30 DEG C to 0 DEG C; (2) introducing gasified isobutene into the reaction kettle at minus 30 DEG C to 0 DEG C, introducing a certain amount of the component, and continuously introducing isobutene and dropping fuming sulfuric acid at the same time; (3) after the fuming sulfuric acid is completely added, continuously introducing a certain amount of an isobutene gas; (4) after the material is completely added, performing heat-preservation reaction at 10-40 DEG C; and (5) performing cooling crystallization on a generated paste product, and performing separation drying, thereby obtaining a 2-acrylamido-2-methylpropanesulfonic acid synthesized product. The synthesized product disclosed by the invention is high in purity, low in cost, convenient in industrial production and relatively low in sulfate radical residue without refining.
