Azeotropic distillation process for separating butanol and butyl acetate

A technology of butyl acetate and azeotropic distillation, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, to achieve the effects of reducing solvent loss, reducing costs, and reducing production costs

Inactive Publication Date: 2007-06-06
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is mainly an improvement to the production process of butyl acetate, and does not involve the separation process of butanol and butyl acetate

Method used

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  • Azeotropic distillation process for separating butanol and butyl acetate

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Experimental program
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Effect test

Embodiment 1

[0017] Fig. 1 is the process flow sheet of separation butanol and butyl acetate by azeotropic distillation.

[0018] Raw material solution containing butanol, butyl acetate and water 5m 3 / h, the material is fed from the middle of the rectification tower 1, the tower kettle is heated by the reboiler 2, the top product enters the phase separation tank 4 after passing through the condensation cooler 3, the heavy phase water part returns to the tower, and the light phase refluxes. Heavy phase water returns in the rectifying tower 1, the butyl acetate concentration of tower top is improved, when still temperature T 1 =123.6°C, top temperature T 2 When =90.1 DEG C, the rectification tower 1 tower tank obtains the finished product butanol. Among them, the moisture content is 0.12%, and the ester content is 3.56%. The ester content in the light phase is relatively high, and part of it is recovered and enters the rectification tower 5. The distillation column 5 is heated by a rebo...

Embodiment 2

[0020] Raw material solution 8m 3 / h, the material is fed from the middle of the rectification tower 1, the tower kettle is heated by the reboiler 2, the top product enters the phase separation tank 4 after passing through the condensation cooler 3, the heavy phase water part returns to the tower, and the light phase refluxes. Heavy phase water returns in the rectifying tower 1, the butyl acetate concentration of tower top is improved, when still temperature T 1 =123.4°C, top temperature T 2 When =90.3 DEG C, the finished product butanol was obtained in 1 tower kettle. Among them, the moisture content is 0.08%, and the ester content is 4.61%. The ester content in the light phase is relatively high, and part of it is recovered and enters the rectification tower 5. The distillation tower 5 is heated by a reboiler 6, and the top product enters the phase separation tank 8 after passing through the condensing cooler 7, and the light phase part is refluxed, and part of it is reco...

Embodiment 3

[0022] Raw material solution 10m 3 / h, the material is fed from the middle of the rectification tower 1, the tower kettle is heated by the reboiler 2, the top product enters the phase separation tank 4 after passing through the condensation cooler 3, the heavy phase water part returns to the tower, and the light phase refluxes. Heavy phase water returns in the rectifying tower 1, the butyl acetate concentration of tower top is improved, when still temperature T 1 =122.6°C, top temperature T 2 When =91.5 DEG C, 1 tower still obtains finished product butanol. Among them, the moisture content is 0.07%, and the ester content is 1.4%. The ester content in the light phase is relatively high, and part of it is recovered and enters the rectification tower 5. The distillation tower 5 is heated by a reboiler 6, and the top product enters the phase separation tank 8 after passing through the condensing cooler 7, and the light phase part is refluxed, and part of it is recovered and ret...

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Abstract

The present invention relates to azeotopic distillation process for separating butanol and butyl acetate. The technological process is completed with the apparatus including rectification tower (1), rectification tower (5), rectification tower (9), kettle reboiler, condensate cooler and phase splitting tank. The technological process includes feeding the material liquid in the middle part of rectification tower (1) and refluxing partial heavy water phase into the tower; refluxing light phase; obtaining butanol product in the kettle; refluxing partial light phase while recovering partially to the rectification tower (5); refluxing partial light phase while obtaining butyl acetate product in rectification tower (5); and feeding the heavy phase to rectification tower (9) and obtaining pure water in the kettle. The present invention has low power consumption, less side products, high butanol product quality, recovery of butyl acetate and high economic effect.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a process for separating butanol and butyl acetate by azeotropic distillation. Background technique [0002] Butanol and butyl acetate are two important solvents in the production of penicillin. Due to the characteristics of the production process itself, butanol and butyl acetate are inevitably mixed together and must be separated. However, the two form an azeotrope under normal pressure (the azeotropic temperature is 116.2 ° C, and the azeotropic composition butanol accounts for 63.3% (wt)), and it is impossible to separate them by general rectification methods. [0003] At present, most factories use chemical conversion treatment. The process is: add alkali to the mixture of butanol and butyl acetate, so that butyl acetate is hydrolyzed into acetic acid and butanol, acetic acid and alkali react to form acetate, and butanol can be extracted by rectification. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/54C07C31/12C07C29/82
Inventor 李春利李彦芬
Owner HEBEI UNIV OF TECH
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