Preparation process and equipment of n-amyl acetate

Abstract

The invention relates to a preparation process of n-amyl acetate. The preparation process comprises the following steps: esterification reaction, dehydration, heavy component removal, light component removal and rectification. A homogeneous catalyst is adopted, and the catalyst is separated by combining a film evaporator, so that side reactions in the subsequent light component removal and rectification processes are greatly reduced, and meanwhile, the efficient conversion rate of the reaction part is ensured; and the prepared product is high in purity, can be stored for a long time, can neglect corrosion to equipment, and is extremely small in environmental pollution. In addition, the invention also provides equipment for the preparation process of n-amyl acetate. The equipment comprises a reaction kettle, a condenser, a phase splitter, the film evaporator, a heavy component collecting tank, a light component removal tower, a rectifying tower and a finished product tank to be matched with the preparation process.

Description

technical field [0001] The invention relates to the technical field of synthesis of acetate compounds, in particular to a preparation process and equipment for n-pentyl acetate. Background technique [0002] N-pentyl acetate, also known as "banana water", is a colorless and transparent liquid with banana and fruit aromas, slightly soluble in water, and miscible with alcohol and ether. N-pentyl acetate is widely used in cosmetics, spices, gunpowder, film, medicine, chemical industry, plastics and textiles and other industries. [0003] The traditional preparation process of n-pentyl acetate is to use concentrated sulfuric acid as a catalyst, using glacial acetic acid and n-amyl alcohol as raw materials, through esterification, dehydration, lightening, and rectification. Although the reaction rate is faster with concentrated sulfuric acid as a catalyst, the There are also many side reactions, especially in the subsequent light removal and rectification process, due to the dec...

AI Technical Summary

Problems solved by technology

[0003] The traditional preparation process of n-pentyl acetate is to use concentrated sulfuric acid as a catalyst, using glacial acetic acid and n-amyl alcohol as raw materials, through esterification, dehydration, lightening, and rectification. Although the reaction rate is faster with concentrated sulfuric acid as a catalyst, the There are also many side reactions, especially in the subsequent light removal and rectification process, due to the decomposition of n-pentyl acetate, the yield and quality will decrease. In addition, the existence of concentrated sulfuric acid will corrode the equipment, and a large amount of acid will be generated in the follow-up. waste water, seriously polluting the environment

With the continuous improvement of technology and production level, the production process of n-pentyl acetate is also constantly improved, but usually by selecting different catalysts to try, the common reports are modified molecular sieves, resins, solid superacids, hetero Polyacids, composite metal oxides, and acid-loaded activated carbon, etc., these catalysts have the advantage of not participating in the reaction system, belonging to heterogeneous catalysts, and easy to separate; but the disadvantages are that most of them are cumbersome to make, the price is high, the yield is average, and the service life It is not long and the follow-up processing is complicated, and it is impossible to realize industrialized mass production

The Chinese patent publication number is CN 105251538B and the invention name is a kind of catalyst H 6 P 2 W 15 Mo 3 o 62 / TiO 2 And the preparation method of n-pentyl acetate, although the productive rate of n-pentyl acetate has been improved under mild reaction conditions by improving the catalyzer, can not pollute the environment, but the synthetic steps of catalyzer are complicated, and increase production cost

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