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Batch extractive distillation separating method of acetonitrile-methylbenzene azeotropic mixtrue

An azeotropic mixture and extractive distillation technology, applied in the direction of extractive distillation, etc., can solve the problems such as unseen data, and achieve the effect of flexible operation and low equipment cost.

Inactive Publication Date: 2007-05-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many articles and patents on extractive distillation, but there is no publicly published information on extractive distillation and separation of acetonitrile-toluene azeotropic system

Method used

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  • Batch extractive distillation separating method of acetonitrile-methylbenzene azeotropic mixtrue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Adopt intermittent extraction rectification device, drop into 500ml acetonitrile-toluene azeotropic mixture (wherein acetonitrile 73%, toluene 27%, all are mass percentages) in heating kettle, the selected extraction agent of test is propylbenzene, open heating kettle heat source and condenser When the cooling source is used, the extractive distillation tower starts to run. When there is reflux at the top of the extractive distillation tower, add the extractant. The feed position of the extractant is near the top of the tower. Control the addition rate of the extractant to 800ml / h. When the temperature at the top of the rectification tower is 81.5-82° C., the acetonitrile content in the distillate is ≥ 99%, and the material starts to be discharged, the reflux ratio is 3:1, and the discharge rate is 200 ml / h. When the temperature at the top of the extractive distillation tower is 83-110°C, the acetonitrile-toluene transition section is extracted, and the addition of the e...

Embodiment 2

[0013] Adopt intermittent extraction and rectification device, drop 500ml acetonitrile-toluene azeotropic mixture (wherein acetonitrile 73%, toluene 27%, all are mass percent) in heating kettle, the extraction agent selected for test is p-tert-butyl toluene, open heating kettle heat source and the cold source of the condenser, the rectification tower starts to run. When there is reflux at the top of the extractive rectification tower, the extractant is added. The feed position of the extractant is near the top of the tower. When the temperature at the top of the extractive distillation tower is 81.5-82° C., the acetonitrile content in the top distillate is ≥ 99%, and the discharge starts, the reflux ratio is 2:1, and the discharge speed is 150 ml / h. When the temperature at the top of the extractive distillation tower is 83-110°C, the acetonitrile-toluene transition section is extracted, and the addition of the extractant is stopped, and the reflux ratio is 10:1. When the temper...

Embodiment 3

[0015] Experimental device and operation method are the same as embodiment one, and extractant adopts mesitylene

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Abstract

The invention discloses a method for intermittent extraction and distillation and separation of acetonitrile- toluene azeotrope, belonging to the separation technique of acetonitrile- toluene. The method is described as the following: using propyl benzene, butylbenzene, isobutylbenzene, sec- butylbenzene, tertiarybutyl phenol, p- diethyl benzene or tertiary-butyl toluene as the extractant, operating in a extracting- fractionating tower at a normal pressure or reduced pressure with a mass ratio of extractant to overhead of 2: 1- 10: 1 and a feeding temperature of extractant of 25- 80 Deg. C, picking separately acetonitrile, the transition section I of a low rate of acetonitrile, and transition section II of toluene and toluene- extractant from the extracting- fractionating tower by controlling the temperature and reflux ratio of the head of extracting- fractionating tower; when the constitute of extractant in heating kettle approaches to the requirement, pumping the extractant into elevated container and feeding material to prepare for the intermittent extraction and distillation and separation of next batch. The merit of the invention is that using extractant to destroy acetonitrile- toluene azeotrope,the high purity acetonitrile and toluene are prepared, and the operation is flexible with a single towel.

Description

technical field [0001] The invention relates to a batch extraction and rectification separation method of an acetonitrile-toluene azeotrope, which belongs to the separation technology of the acetonitrile-toluene azeotrope. 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, can separate multiple components through one tower, and has low equipment investment. It is suitable for the separation of small-batch azeotropic systems and near-boiling systems. Acetonitrile and toluene are commonly used solvents in the pharmaceutical industry. The acetonitrile-toluene mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/40
Inventor 崔现宝周金波杨志才
Owner TIANJIN UNIV
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