Process for synthesizing n-butyl acetate

Abstract

The invention provides a process for synthesizing n-butyl acetate, in particular relates to a novel process for synthesizing n-butyl acetate by utilizing a pressure-difference thermal-coupling reaction rectification column. The process device comprises a pressure-difference thermal-coupling reaction rectification column atmospheric column, a vacuum column, a compressor, a heat exchanger, a pump and a phase separator. Raw materials n-butyl alcohol and acetic acid perform an esterification reaction in the vacuum column reaction section of the pressure-difference thermal-coupling reaction rectification column to generate the n-butyl acetate, the compressor is arranged between the vacuum column and the atmospheric column, steam extracted from the top of the vacuum column is pressurized through the compressor and enters the bottom of the atmospheric column, a reboiler at the bottom of the vacuum column is heated by potential heat of the steam at the top of the atmospheric column to perform thermal coupling between two columns, so that great energy-saving in the rectification process can be realized, the advantages of the pressure-difference thermal-coupling rectification column and a reaction rectification column can be played sufficiently, the esterification reaction and refining of the target product can be realized at the same time. According to the process, over 97 percent of acetic acid and over 99 mass percent of the high-purity product can be obtained.

Description

Technical field: [0001] The present invention relates to a kind of n-butyl acetate synthesis process, specifically refers to the novel process method of synthesizing n-butyl acetate by using reactive distillation tower and differential pressure thermal coupling technology, which can complete the synthesis and product separation of n-butyl acetate, and Compared with conventional reactive distillation equipment, energy saving can be more than 50%. Background technique: [0002] N-butyl acetate is an important chemical raw material, often used as an organic solvent, dehydrating agent, and extraction agent, and is widely used in chemical, pharmaceutical, leather, plastic, and spice industries. At present, the production of n-butyl acetate is mostly batch and continuous production processes using concentrated sulfuric acid as a catalyst. These processes are relatively mature in application and simple in operation, but they also have many defects. First, liquid concentrated sulfu...

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Problems solved by technology

[0006] Although the use of the solid acid catalyst and the application of the reactive distillation tower process have effectively improved the selectivity of the esterification reaction, the conversion rate of acetic acid and the separation purity of the product, the problem of high energy consumption in the rectification tower still exists, so it is necessary to reduce the Process energy consumption, improve the energy utilization rate of the rectification process

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