Process for synthesizing sodium ascorbate

Abstract

The invention discloses a process for synthesizing sodium ascorbate. The sodium ascorbate is prepared through carrying out an esterification reaction on gulonic acid and methanol and then subjecting an esterification reaction product to a reaction with a sodium salt. The process is characterized by carrying out the following steps sequentially: (1) dissolving gulonic acid in methanol, and then, carrying out gradient decoloring by a filter with the pore size of 1 to 30 microns, a filter with the pore size of 0.06 to 1 micron and a powdered activated carbon layer, so as to obtain a decolored solution for later use; (2) subjecting the decolored solution to a cyclic reaction for 1.2 to 1.5 hours in macroporous hydrogen type resin, so as to obtain an esterification reaction solution; and (3) pouring the esterification reaction solution in a non-pressure vessel, flowing a suspension, which is prepared through mixing sodium bicarbonate, of which the mole is 1.01 to 1.05 times that of gulonic acid, or sodium carbonate, of which the mole is 0.505 to 0.51 times that of gulonic acid, with methanol, into the solution at a constant speed at the temperature of 70+ / -2 DEG C while keeping a stirring state, continuing to carry out heat preservation, then, carrying out cooling until the temperature is room temperature, and carrying out centrifugal dehydration, thereby obtaining sodium ascorbate. According to the process, the time for synthesis is short, the product is high in purity and high in quality, and the energy consumption is low.

Description

Technical field [0001] The invention belongs to the field of chemical processes, and specifically relates to a synthesis process of vitamin C sodium salt. Background technique [0002] The synthetic process of vitamin C sodium salt at least includes basic processes such as decolorization, temperature adjustment, esterification, and centrifugation. In the current process method for preparing vitamin C sodium salt, the process flow is not easy to implement, the generated vitamin C sodium salt is low in purity, the single-pass conversion rate of reactants is low, the production process is complicated, the production efficiency is low, and the cost is high. Summary of the invention [0003] In order to overcome the above-mentioned technical problems in the prior art, the purpose of the present invention is to provide a synthesis process of vitamin C sodium salt. The present invention not only has simple manufacturing process and improves work efficiency, but also produces vitamin C ...

AI Technical Summary

Problems solved by technology

In the current process for preparing vitamin C sodium salt, the process is not easy to implement, the purity of the generated vitamin C sodium salt is low, the single-pass conversion rate of reactants is low, the production process is complicated, the production efficiency is low, and the cost is high.