130-37-0Relevant articles and documents
New route to vicasol, a water-soluble form of vitamin K3
Matveev,Odyakov,Zhizhina
, p. 469 - 472 (2001)
A procedure was suggested for preparing vicasol in an approximately 85% yield in a two-phase system consisting of concentrated (5 6 M) aqueous solution of NaHSO3 and a solution of 2-methyl-1,4-naphthoquinone in an incombustible organic solvent
Preparation method of menadione sodium hydrogen sulfite
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Paragraph 0059; 0082-0087, (2021/07/31)
The invention provides a preparation method of menadione sodium hydrogen sulfite. The preparation method comprises the following steps of: by taking alpha-methyl-gamma-butyrolactone and benzene as raw materials, preparing 2-methyl-3, 4-dihydro-1 (2H)-naphthalenone through Friedel-Crafts reaction; carrying out halogenation reaction on the 2-methyl-3, 4-dihydro-1 (2H)-naphthalenone and a halogenation reagent at the ortho position of carbonyl, and carrying out alkali elimination to prepare 2-methyl-1-naphthol; oxidizing the 2-methyl-1-naphthol through air to obtain 2-methyl-1, 4-naphthoquinone; and carrying out addition reaction on the 2-methyl-1, 4-naphthoquinone and sodium hydrogen sulfite to prepare the menadione sodium hydrogen sulfite. According to the method, the raw materials are cheap, easily available and low in cost; the process operation is safe, simple and convenient, less process wastewater is generated, and the method is green and environment-friendly; and the stability of the raw materials and intermediate products is high, high reaction activity and selectivity are high, reaction conditions are easy to realize, side reactions are few, the purity and yield of the product are high, and industrial production of the menadione sodium bisulfite can be facilitated.
Green preparation method of menadione sodium bisulfite
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Page/Page column 0078-0083, (2021/07/31)
The invention provides a preparation method of menadione sodium bisulfite. The method comprises the following steps of: by using cheap and easily available 3, 4-dihydro-1 (2H)-naphthalenone as a raw material, carrying out halogenation-elimination to obtain 1-naphthol; carrying out methylation reaction to generate 2-methyl-1-naphthol; carrying out air oxidation on the 2-methyl-1-naphthol to obtain 2-methyl-1, 4-naphthoquinone; and carrying out addition reaction on the 2-methyl-1, 4-naphthoquinone and sodium hydrogen sulfite so as to obtain the menadione sodium bisulfite. The method has the advantages of cheap and easily available raw materials, low cost, safe, simple and convenient process operation, less process wastewater generation, green and environment-friendly performance, high stability of raw materials and intermediate products, high reaction activity and selectivity, easy realization of reaction conditions, few side reactions and high product purity and yield, and can facilitate the industrial production of the menadione sodium bisulfite.
A method for continuous preparation of menadione sodium bisulfite (by machine translation)
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Paragraph 0041; 0042, (2017/03/17)
The invention discloses a tubular method for continuous preparation of menadione sodium bisulfite, the method comprises the steps of: preheating to 50-80 °C β-menadione of the solution with the sodium metabisulfite solution through the metering pump, respectively, is mixed by the mixer, the mixed material from entering into the tubular reactor for reaction, control reaction solution temperature is 50-80°C, in the tubular reactor the reaction residence time in 1-15min; a reactor outlet the cooling crystallization materials, centrifugal separation of the solid product, washing, drying by menadione sodium bisulfite. This invention adopts the tubular reactor to produce the menadione sodium bisulfite, production cycle is shortened, the product yield is high, stable quality; easy control of reaction conditions, the operation is simple and safe, easy automation control; the continuous production can be realized, the industry requires only a small amount of investment in large-scale production can be realized. (by machine translation)
Method for producing 2-methyl-1,4-naphthoquinone
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Page/Page column 5-6, (2008/06/13)
[PROBLEM TO BE SOLVED]: To provide a method for easily collecting high pure 2-methyl-1,4-naphthoquinone in the shape to converts easily to hydrosulfite in a high yield from hydrogen peroxide oxidation reaction mixture of 2-methylnaphthalene in aliphatic carboxylic acid. [SOLUTION]: The method for collecting 2-methyl-1,4-naphthoquinone into aromatic hydrocarbon layer characterized by concentrating the oxidation reaction mixture obtained by liquid phase oxidizing 2-methylnaohthalene in aliphatic carboxylic acid so that the density of the reaction product may become 30-80 wt% by distillation, and by touching with aromatic hydrocarbon solvent and water for the layer separation.