The application relates to the technical field of
organic synthesis, and discloses a method for continuously preparing
folic acid through
pipe reactor collision.
High pressure of a
pipe reactor is used to make
sodium pyrosulfite and N-(4-aminobenzoyl)-L-
glutamic acid and 2,4,5-triamino-6-hydroxypyrimidine
sulfate homogeneously disperse, raw materials are fully dispersed under the condition of less aqueous
solvent, high-speed flow generated by
high pressure is used to make N-(4-aminobenzoyl)-L-
glutamic acid, 2,4,5-triamino-6-hydroxypyrimidine
sulfate and trichloroacetone collide to occur a cyclization reaction, and the problem that material reaction is insufficient due to
folic acid deposition and wrapping is avoided;
sodium carbonate solution is sprayed to the continuous collision liquid flow, loss of raw materials caused by local alkali
hydrolysis of trichloroacetone is avoided, the purity and yield of
folic acid crude product are significantly improved, and the amount of waste water is reduced. The whole preparation process is a closed pipeline and a closed container,
odor volatilization is avoided to affect the operation space,
automatic control is easy, and the method is suitable for industrial production.