Novel synthesis technology of adipic acid (2-propyl heptyl) ester

Abstract

The invention discloses a novel synthesis technology of adipic acid (2-propyl heptyl) ester. The technology comprises the following steps: (1) taking adipic acid and heptanol according to the molar ratio of 1:(2.3-2.5) as raw materials, and taking a catalyst with the mass of 0.18%-0.22% of the total mass of the adipic acid and heptanol, wherein the catalyst is a mixture of isopropyl titanate and tetrabutyl titanate with the ratio of 2:1; (2) taking adipic acid and heptanol according to the molar ratio of 1:(1.8-1.9) as raw materials, placing the raw materials into a reaction kettle, adding the catalyst, and heating for an reaction for 2-3 hours; (3) heating the reaction liquid in the step (2) to be at 200-220 DEG C, and adding the remaining heptanol for complete reaction to obtain a crude product; (4) performing water washing, decoloring, and filtering on the crude product to obtain the finished product of the adipic acid (2-propyl heptyl) ester. The novel synthesis technology provided by the invention can reduce production energy consumption, and hardly generates waste water with a high COD value, thereby meeting the requirement of environment protection.

Description

technical field [0001] The invention belongs to the synthetic field of a plasticizer, and more specifically relates to a synthetic process of (2-propylheptyl) adipate. Background technique: [0002] (2-Propylheptyl) adipate is an industrial plasticizer with excellent electrical properties, good cold resistance, heat resistance and extraction resistance. It is an excellent plasticizer for polyvinyl chloride, polystyrene, nitrocellulose, synthetic rubber, etc. It can be used in the equivalent production of cold-resistant agricultural films, frozen food packaging films, and heat-resistant wire and cable coatings. [0003] The synthesis of adipate (2-propylheptyl) ester belongs to the esterification reaction, usually, the esterification reaction needs to be successfully completed under the condition of catalyst and heating. The classic esterification catalyst is an acid catalyst, but the acid catalyst is easy to corrode the equipment, and it will also bring neutral waste water,...

AI Technical Summary

Problems solved by technology

The classic esterification reaction catalyst is an acid catalyst, but the acid catalyst is easy to corrode the equipment, and it will also bring neutral waste water, which is not conducive to environmental protection; in addition, the esterification reaction needs to be carried out at high temperature, and if the reaction time is too long, it will be oxidized and affect The grade and yield of the product, thus increasing the cost