Preparation method of electronic grade malonic acid

• Main Authors: ZHU ZHAOJUN, LI JUAN, LI JIANLE, LIU SHAOHUA, LI JING, DONG HAOHAO, DONG ZHIYAN, ZHANG CHENLIANG, LI CHENGGUO
• Format: Patent
• Language: Chinese; English
• Published: 09.02.2021
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention relates to the technical field of chemical synthesis, and particularly discloses a preparation method of electronic grade malonic acid. The preparation method of the electronic grade malonic acid comprises the following steps: a, mixing deionized water and a catalyst, heating, and performing hydrolyzing to obtain a primary hydrolysate; b, adding the primary hydrolysate into a tandemreaction device formed by connecting 3-5 reaction kettles in series, and sequentially carrying out hydrolysis reaction at the temperature of 40-70 DEG C under the vacuum condition to obtain secondaryhydrolysate; c, cooling, crystallizing and drying the secondary hydrolysate in a tubular crystallizer to obtain the electronic grade malonic acid. The method for preparing the electronic grade malonicacid has the advantages of short production period, fine and uniform crystals, difficulty in impurity wrapping, simple operation process and low cost, other byproducts are not generated, the yield and quality of the malonic ac