Novel synthesis process of octyl 2-propylheptyl phthalate

Abstract

The invention discloses a novel synthesis process of octyl 2-propylheptyl phthalate. The process comprises steps as follows: (1), raw materials are taken in a molar ratio of phthalate to alcohol of 1: (2.5-2.7), a catalyst, namely, titanium, is taken according to the amount accounting for 0.3%-0.35% of the total mass of phthalate and alcohol, and alcohol is a mixture of heptanol and octanol in a molar ratio of 1:1; (2), all phthalate, all heptanol and 50% of the catalyst are put into a reaction kettle, nitrogen is fed into the reaction kettle, and the reaction kettle is heated to the temperature of 200-220 DEG C for reaction; (3), all octanol and the residual catalyst are put into the reaction kettle, the reaction continues, and a crude product is obtained until a complete reaction is finished; and (4) after the crude product is washed with water and dealcoholized, activated carbon is used for decoloration, and a finished product is obtained after impurities are filtered. According to the process, nitrogen is used for protection, the condition that an esterification reaction is oxidized at the high temperature is prevented, the chroma grade of octyl 2-propylheptyl phthalate synthetized with the process is better, and the product quality is more stable.

Description

technical field [0001] The invention relates to the field of organic chemical synthesis, in particular to a synthesis process of a plasticizer (2-propylheptyl) octyl phthalate. Background technique: [0002] (2-Propylheptyl)octyl phthalate is a main industrial plasticizer with excellent electrical properties and high plasticizing efficiency. It has good cold resistance, heat resistance and extraction resistance, and is suitable for industrial processing of polyvinyl chloride resin, especially for heat-resistant cable materials such as cable materials requiring high insulation, transparent plastic particles, and light box films. (2-Propylheptyl)octyl phthalate combines the advantages of DOP and DPHP in applications, and is a main plasticizer with comprehensive performance. [0003] The synthesis of (2-propylheptyl) octyl phthalate belongs to esterification reaction, the reaction temperature of esterification reaction is very high, easily causes oxidation reaction, thereby af...

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Problems solved by technology

[0003] The synthesis of (2-propylheptyl) octyl phthalate belongs to the esterification reaction, the reaction temperature of the esterification reaction is very high, it is easy to cause oxidation reaction, thereby affecting the quality and chroma of the product, and making the production cost increase