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Production of naphthalenesulfonic acid

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专利汇可以提供Production of naphthalenesulfonic acid专利检索,专利查询,专利分析的服务。并且PURPOSE: To obtain the titled compound useful as a raw material for naphthol or raw material for intermediate of azo dye, in high purity at a low cost while suppressing the production of by-products, by sulfonating naphthalene with concentrated sulfuric acid in the presence of a super-strong acid.
CONSTITUTION: The objective naphthalenesulfonic acid is produced by sulfonating naphthalene with concentrated sulfuric acid in the presence of a catalyst consisting of a super-strong acid, preferably a solid super-strong acid consisting of a fluorinated sulfonic acid resin. The amount of the super-strong acid added to the system is 0.01W5wt.%, preferably 0.1W2wt.% based on the total weight of the naphthalene and the sulfonation agent. A condensation product of naphthalenesulfonic acid and formalin can be produced by condensing the sulfonated product with formalin and the product is useful as an adjuvant for cement, coal, pigment, dye and photographic film.
COPYRIGHT: (C)1989,JPO&Japio,下面是Production of naphthalenesulfonic acid专利的具体信息内容。

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