Synthetic method and synthetic device of propyl propionate

Abstract

The invention provides a synthetic device of propyl propionate, which comprises a catalytic reaction rectifying tower, a first condenser, a n-propyl alcohol feeding hole, a propionic acid feeding hole, a fractionating tower, a second condenser, a phase splitter, a reboiler, a purification tower, a third condenser and a propyl propionate collection tank. The invention further provides a method forsynthesizing propyl propionate through the device. The synthesis device is reasonable in structure and convenient to use, wherein water in a product can be moved away from the reaction section in time by adopting a catalytic reaction rectification technology, so that the reaction is facilitated to move towards the direction of forming propyl propionate; meanwhile, a reaction product is separatedthrough a stripping section at the lower part, so that the chance of further contact with the catalyst is avoided, and the selectivity of propyl propionate is improved. According to the invention, theprocess from reaction to product refining can be continuously carried out, the production efficiency is high, the propyl propionate selectivity is high, and industrial production is facilitated.

Description

technical field [0001] The invention relates to the technical field of high-purity propyl propionate synthesis, in particular to a synthesis method and a synthesis device of propyl propionate. Background technique [0002] Propyl propionate (n-Propyl propionate referred to as PP), the molecular formula is C 6 h 12 o 2 , with a molecular weight of 116.15, a colorless transparent liquid with a slight pungent odor. Propyl propionate also has the following characteristics: melting point -76°C, boiling point 122-124°C, relative density 0.881 (20 / 4°C), refractive index 1.393, flash point 24.4°C; transparent, liquid insoluble in water, soluble in alcohol, Organic solvents such as ether. It is a high-tech, high value-added chemical product that has emerged in recent years. It can be used in many rechargeable batteries, such as lithium-ion batteries, as a co-solvent for its non-aqueous electrolyte, which can improve the performance of the battery, such as increasing its energy de...

AI Technical Summary

Problems solved by technology

However, in the existing technology of producing propyl propionate with propionic acid and n-propanol as raw materials, the kettle-type batch process method is usually used. This synthesis method has problems such as long reaction time, high energy consumption, and high material consumption, resulting in the transformation of propyl propionate. The rate is low; Propyl propionate needs to go through multiple intermittent processes and equipment systems from production to product entering and exiting the tank, which cannot meet the needs of the existing high-yield industrialized preparation of propyl propionate, and the purity of the obtained propyl propionate can only reach 99.5%, with the development of the battery electrolyte industry, higher requirements are put forward for the purity of propyl propionate, and there is an urgent need for propyl propionate with a purity of 99.99%. At present, research on the preparation of high-purity propyl propionate at home and abroad And technical aspect report is seldom, do not see relevant bibliographical information; So design a kind of high-purity propyl propionate synthetic device is very necessary

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