Method for refining glutaraldehyde
A refining method, glutaraldehyde technology, applied in the preparation of heterocyclic compounds, organic chemistry, etc., can solve the problems of darkening of polymerization color, inability to guarantee product color, and failure to meet the requirements of medical grade purification, and achieve the operation process easy effect
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[0027] In a 10000L reactor, add metered water, 3,4-dihydropyran-2-methyl ether and phosphoric acid catalyst successively, and carry out the hydrolysis reaction at 50~90℃ for 0.5~2 hours to obtain a concentration of 15~35% The semi-finished glutaraldehyde aqueous solution. The semi-finished product is separated into methanol according to the process flow shown in Figure 1. The temperature of the material when it enters the rectification tower is controlled at 50~95℃, and the vacuum of the rectification system is controlled at 0.60~0.96Mpa; 53.6% is obtained after methanol is separated The concentration of glutaraldehyde aqueous solution has a color of No. 60 and a methanol content of 0.35%. Decolor and filter the above materials according to the process flow shown in Figure 2 to obtain an aqueous solution of glutaraldehyde with a chromaticity of No. 30, and then use 15-30% NaH 2 PO 4 The pH of the solution is adjusted to 3.0-5.0, and distilled water is added to p...
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