Glucono Delta Lactone CAS 90-80-2

At present, there are three main production methods of gluconolactone: one is to directly prepare gluconolactone by enzymatic and electrochemical methods using glucose as the starting material. However, this method has low conversion rate and difficult reaction control. The other is to use calcium gluconate as the starting material, and prepare gluconolactone through acidification, pressure filtration, ion exchange, concentration, crystallization, separation and drying. The period of this method is longer, and will produce a large amount of industrial waste liquid. The other is to use sodium gluconate as the starting material to obtain the product of gluconolactone through ion exchange, concentration under reduced pressure, static crystallization, centrifugal separation, and constant temperature drying. This method has long production cycle, high energy consumption and high production cost.

The ultraviolet/hydrogen peroxide method is a new type of advanced oxidation technology, which uses a strong oxidant and light to generate OH free radicals with strong oxidizing ability. Due to its unique and excellent oxidation properties, it has received extensive attention in recent years. It is mainly used in the treatment of nitrogen-containing dye wastewater, advanced water purification treatment, and research on desulfurization and denitrification. Good results have been achieved in these fields. The key of the present invention is to use this technology to solve many problems encountered in the industrial production of gluconolactone.

CN102367244A discloses a method for preparing gluconolactone. The method includes the following steps:

Glucose is dissolved in deionized water to obtain glucose solution as a raw material, and ultraviolet light is used to irradiate the glucose solution. The reaction device is equipped with a ventilation pump to speed up the mass transfer process. During the reaction, hydrogen peroxide is added, and the catalytic oxidation reaction is carried out under stirring conditions. The temperature is 20-60°C, the time is 1-4 hours, and the gluconic acid solution is obtained by filtration; then the gluconic acid solution is concentrated under reduced pressure at 70°C-80°C until the crystal liquid content is 70%-90%; the concentrated Add crystal seeds to the liquid, place it in a crystallization mixer for crystallization, and obtain the gluconolactone product.

The invention not only shortens the production cycle, does not cause industrial pollution, but also reduces the production cost, has low energy consumption and high yield, and is suitable for industrialized production.