Synthetic process for vitamin C sodium salts

Abstract

The invention relates to a synthetic process for vitamin C and sodium salts, which pertains to the technical field of chemistry. Gulonic acid and methanol carry out esterification reaction and then react with the sodium salts. The synthetic process is characterized by be executed according to the following steps: (1) the gulonic acid is dissolved in methanol and then goes through a filter with the aperture ranging from 1 Mum to 50 Mum and goes through a filter with the aperture ranging from 0.01 Mum to 1 Mum and a powdered activated carbon layer for gradient decolorization, thus obtaining a destaining solution for further use; (2) the destaining solution circularly reacts for 1.2 hours to 1.8 hours in macroporous hydrogenous resin, thus obtaining esterification solution; (3) the esterification solution is injected into a normal pressure container, kept being stirred at the temperature of 70 DEG C plus or minus 2 DEG C and uniformly added with suspending liquid obtained by mixing sodium bicarbonate with the mole number of 1.01 times to 1.05 times of the gulonic acid or the sodium carbonate with the mole number of 0.505 time to 0.51 time of the gulonic acid with methanol, and then is cooled to the room temperature after thermal insulation is executed continuously, thus obtaining the vitamin C sodium salts after centrifugal dehydration. The process has short synthesis time, products with high purity and good quality, and low energy consumption.

Description

technical field [0001] The invention relates to a synthesis process of vitamin C sodium salt, which belongs to the technical field of chemical industry. Background technique [0002] Vitamin C sodium salt is a commonly used food additive and medicine. At present, the commonly used synthesis process is to combine guronic acid, methanol, and 98% concentrated sulfuric acid in a ratio of 1:4.5:0.025 by weight at 68-72°C under normal pressure. After carrying out the esterification reaction for 4 to 5 hours, after cooling to 50 to 55°C, add sodium bicarbonate in moles equal to the sum of the moles of gulonic acid and 1 / 2 the moles of concentrated sulfuric acid, and then heat up to 65 to 72°C After reacting for another 4-5 hours, cool to room temperature, and then dehydrate to obtain a wet product of vitamin C sodium. The content of the wet product is about 65-75%, and the content after drying is about 85-89%. The disadvantage of this process is that the synthesis time is long, th...

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that the synthesis time is long, the single batch synthesis time is between 10 and 12 hours, and the product content is low, the quality is poor, the color is grayish yellow, no obvious crystal shape, the appearance quality is poor, there is a cooling process in the middle, and the energy consumption is high. Big

Images