The invention discloses a preparation method of saccharin. The invention provides a preparation method of saccharin as shown in a formula 1 represented in the specification. The preparation method ischaracterized by comprising the following step: in water, in the presence of tungstate and/or tungstic acid, carrying out oxidation reaction on a compound shown in a formula 2 and hydrogen peroxide toobtain saccharin shown in a formula 1.
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Paragraph 0138-0139
(2020/10/14)
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