Novel esterification production equipment and method for n-propyl acetate

Abstract

The invention provides novel esterification production equipment and method for n-propyl acetate. The equipment comprises a raw material preheater, a fixed bed catalyst container, a dehydrating tower, a condenser, a layering tank and a crude ester tank, wherein a discharge hole in the top of the raw material preheater is connected with a feed hole in the bottom of the fixed bed catalyst container; a gas-phase outlet at the top of the fixed bed catalyst container is connected with a gas-phase inlet at the side of the dehydrating tower, a gas-phase outlet at the top of the dehydrating tower is connected with a gas inlet at the top of the condenser, a liquid outlet at the bottom of the condenser is connected with a liquid inlet at the top of the layering tank, and an upper outlet at the side of the layering tank is connected with a feed inlet at the top of the crude ester tank. The fixed bed catalyst container in which the solid catalyst is arranged is adopted for catalytic reaction, heating through a reboiler and an esterification kettle is not needed, equipment used in the esterification production process is reduced, and energy consumption is reduced; meanwhile, sulfuric acid is prevented from corroding pipelines and equipment, and the production stability and safety are improved.

Description

technical field [0001] The invention relates to a novel esterification production equipment and method of n-propyl acetate, belonging to the technical field of fine chemicals. Background technique [0002] N-Propyl Acetate is also known as Propyl Acetate and Propyl Acetate. It has a slight fruity aroma, and it has a pear-like aroma after dilution. Natural products exist in bananas, tomatoes, raspberries, etc. N-propyl acetate has excellent dissolving ability to ethyl cellulose, nitrocellulose, styrene, methacrylate resin and other synthetic resins, and is widely used as a solvent for coatings, inks, nitro spray paints, varnishes and various resins. Excellent solvent, also used in the flavor and fragrance industry, mainly used to prepare pear, honey, banana, apple, alcoholic beverages and gooseberry flavors, and also used as a solvent for fruit flavors. It is used in various chemical production fields. wider application. [0003] Most of the existing production methods of n...

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Problems solved by technology

[0004] However, the quality of the finished product prepared by the above method has the following disadvantages: 1) polymers are prone to block the pipeline in the esterification system and are difficult to clean; 2) due to the long production time, the material has a high color after polymerization; 3) the use of sulfuric acid As a catalyst, the stainless steel pipeline in the system is easy to corrode and leak, and there is a big safety hazard; 4) The ester content in the final product is low

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