Batch extraction distillation separation method for propyl alcohol-propyl formate azeotropic mixture

A technology of azeotropic mixture and propyl formate, which is applied in the field of batch extraction, rectification and separation, can solve the problems of polluting the environment, difficulty in separation, and unseen problems, and achieves the effect of flexible operation and low equipment investment

Inactive Publication Date: 2012-07-04
UNIV OF JINAN
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Problems solved by technology

The propanol-propyl formate mixture produced in the production process is difficult to separate because propanol and propyl formate form an azeotrope (the mass fraction of propanol is 9.8%). If it is not recycled, it will not only pollute the environment, but also increase production c...

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  • Batch extraction distillation separation method for propyl alcohol-propyl formate azeotropic mixture

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Adopt intermittent extraction and rectification device, drop 500L propanol-propyl formate azeotropic mixture (wherein propanol 48%, propyl formate 52%, both are mass percentages) in heating kettle, extractant is isobutanol, open heating kettle The heat source and the cold source of the condenser, after a period of reflux at the top of the extraction and rectification tower, the temperature of the top of the tower is stable, and the extraction agent is added. The feeding position of the extraction agent is near the top of the tower. , when the temperature at the top of the extractive distillation column was 80.9-81.6°C, the propyl formate content in the distillate was ≥99% and began to discharge, the reflux ratio was 3:1, and the discharge speed was 200L / h. When the temperature at the top of the extractive distillation column is 81.6-96.8°C, take out the propanol-propyl formate transition section, and stop adding the extractant, the reflux ratio is 9:1, when the temperatu...

Embodiment 2

[0013] Adopt intermittent extraction and rectification device, drop 500L propanol-propyl formate azeotropic mixture (wherein propanol 10%, propyl formate 90%, both are mass percentages) in heating kettle, extractant is isobutanol, open heating kettle The heat source and the cold source of the condenser, after a period of reflux at the top of the extractive distillation column, the temperature at the top of the column is stable, and the extractant is added. The feeding position of the extractant is near the top of the column. , when the temperature at the top of the extractive distillation column was 80.9-81.6°C, the propyl formate content in the distillate was ≥99% and began to discharge, the reflux ratio was 2:1, and the discharge speed was 300L / h. When the temperature at the top of the extractive distillation column is 81.6-96.8°C, take out the propanol-propyl formate transition section, and stop adding the extractant, the reflux ratio is 10:1, when the temperature at the top...

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Abstract

The invention discloses a batch extraction distillation separation method for a propyl alcohol-propyl formate azeotropic mixture, which belongs to the separation technique for the propyl alcohol-propyl formate azeotropic mixture. The method comprises utilizing isobutanol as extractant, enabling an extraction distillation tower to operate under the following conditions that the mass ratio of the extractant to tower top distillate is 0.5:1-10:1 and material inlet temperature of the extractant is 20-60 DEG C, controlling the extraction distillation tower top to have different temperatures and different reflux ratios, respectively extracting a propyl formate product, a propyl alcohol-propyl formate transition section I, a propyl alcohol product and a propyl alcohol- extractant transition section II, pumping the extractant into a high-position tank when extractant compositions of a heating kettle reach the requirements, and feeding materials to perform next batch extraction distillation separation. The batch extraction distillation separation method has the advantages that the single-tower equipment is low in cost and flexible in operation, and the extractant is utilized to destroy a propyl alcohol-propyl formate azeotropic system to separate out high-purity propyl alcohol and propyl formate products.

Description

technical field [0001] The invention relates to a batch extraction and rectification separation method of propanol-propyl formate azeotropic mixture, which belongs to the separation technology of propanol-propyl formate azeotropic mixture. Background technique [0002] Extractive distillation is a special distillation separation technology, which is suitable for the separation of azeotropic systems. The purpose of separation is achieved by continuously adding extractant to the top of the rectification tower to change the relative volatility between the original components. Batch extractive distillation combines the advantages of batch distillation and extractive distillation. It is flexible in operation and can separate multiple components through one tower. The equipment investment is small, and it is suitable for the separation of azeotropic and near-boiling systems in small batches. The chemical structure formula of propyl formate is: C4H8O2, it can be used as solvent an...

Claims

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Application Information

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IPC IPC(8): B01D3/40C07C31/10C07C29/84C07C69/06C07C67/54
Inventor 姜占坤孙国新袁美龙夏光明
Owner UNIV OF JINAN
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