Heat pump rectifying production process and plant for n-butyl acetate

Abstract

This invention discloses a method to produce butyl acetate by heat pump distillation, in which raw materials are esterified in an esterification tank and an esterification tower and distilled in a distillation tower to obtain products. It has the characteristics that mixed gas from the top of the esterification tower and the distillation tower is compressed into over-heated gas and exchanges heat as a heat source with raw materials, the esterification tank and the tower bottom reboiler. The facilities employed in this method include an esterification tower, an esterification reboiler, an esterification tank, a distillation tower, a distillation reboiler, a cooling device, a phase separator and a modulation valve. The esterification tank and the esterification reboiler are connected with the esterification tower, the distillation tower is connected with the distillation reboiler, and two sets of heat pumps are also uniquely included. By the method in this invention, heating vapor and cooling water can be saved in butyl acetate production, which greatly promotes the energy utilization efficiency and lowers the energy consumption in butyl acetate distillation by 56.9%. This method is applicable in the field of butyl acetate production.

Description

technical field [0001] The invention relates to a production method of butyl acetate, in particular to a heat pump rectification production method of butyl acetate. [0002] The invention also relates to a device for use in the above-mentioned method. Background technique [0003] Butyl acetate is an excellent organic solvent, widely used in coatings, spices, leather, pharmaceuticals and other industries. In recent years, as acetates have gradually replaced aliphatic ketones such as methyl ethyl ketone and methyl isobutyl ketone, and aromatic solvents such as benzene, toluene and xylene, the demand for butyl acetate at home and abroad has increased significantly. [0004] The methods for preparing butyl acetate mainly include the catalytic synthesis of neodymium trioxide, the catalytic synthesis of DH catalyst, and the esterification method using sulfuric acid catalyst. At present, the traditional sulfuric acid catalyzed esterification method is commonly used in the domest...

AI Technical Summary

Problems solved by technology

At present, the traditional sulfuric acid catalyzed esterification method is commonly used in the domestic industrial production of butyl acetate. Because this method mainly uses unit operations such as reactive distillation, the energy consumption and material consumption are relatively high.

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