Device for separating benzene-cyclohexane azeotropic mixture and separation method thereof
An azeotropic mixture and separation method technology, applied in distillation purification/separation, organic chemistry, extractive distillation and other directions, can solve the problems of large heat load of the extractant, strong requirements on the volume of the tower kettle, difficult operation and design, etc., and achieve economical savings. The effect of energy consumption, volume reduction and operation time reduction
Inactive Publication Date: 2012-06-20
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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Problems solved by technology
However, in this mode of operation, with the continuous addition of the solvent, the liquid in the tower will increase, and the volume of the tower will be more demanding.
On the other hand, in batch extraction and rectification operation, the accumulation of extractant in the tower still will cause problems such as large heat load, difficult operation and design, etc.
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[0048] The benzene-cyclohexane binary azeotropic mixture was selected as the experimental research system, and the mixed solvent composed of DMF (N,N dimethylformamide) and DMSO (dimethyl sulfoxide) with a molar ratio of 1 was used in the normal 1000ml of binary near-boiling point mixture of benzene and cyclohexane was separated under pressure, wherein the mole percentage of cyclohexane in the mixture was 47.64%. The diameter and length of the stripping section are 38 mm and 800 mm respectively, and the packing height is 500 mm; the diameter and length of the extraction section are 38 mm and 1000 mm respectively, and the packing height is 800 mm; the internal packing is φ2. 5*2.5 stainless steel DIXON packing; the rectification section is a glass tube with a diameter and length of 38mm and 300 mm respectively, with a φ2.5*2.5 stainless steel DIXON packing inside, and the height of the packing section is 200 mm.
[0049] The inventive method result analysis and the superiority ...
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Abstract
The invention relates to a device for a benzene-cyclohexane azeotropic mixture and a separation method thereof. The device comprises a rectifying tower, a solvent recovery tower, an intermediate storage tank, a rotor flowmeter, a condenser, a reflux ratio controller, a reboiling ratio controller, a filler, a thermocouple, a head tank, heat-preservation rock wool, a solvent recovery kettle, an electric heating cover, a U-shaped tube differential pressure gauge, and the like. The method comprises the following steps of: full-reflux operation without a solvent; full-reflex operation with the solvent; product extraction and solvent recovery at constant reflux ratio under the condition that the solvent is added; and solvent recovery at constant reflux ratio under the condition that the solvent is not added. The invention is suitable for a benzene-cyclohexane azeotropic mixture which is formed by mixing at any ratio, and can simultaneously collect light component products and carry out solvent recovery; the operation is convenient, the control is easy, the operation time is relatively less, and the energy consumption is reduced; and the separation effect is better, the solvent recovery is realized, the better economic property is provided, and the environmental protection is facilitated.
Description
technical field [0001] The present invention relates to a kind of device and method for separating the azeotropic mixture of benzene and cyclohexane, in particular to a compound intermittent extraction and rectification device and method for separating the azeotropic mixture of benzene and cyclohexane, specifically adopting A method for separating the benzene-cyclohexane azeotrope system through batch extraction and rectification performed simultaneously by a batch rectification system and a solvent recovery system. Background technique [0002] Batch extractive distillation is a new research topic, it has both the flexibility and economy of batch distillation and the practicability of extractive distillation, and it is suitable for the chemical, pharmaceutical, petroleum deep processing and other industries that cannot be completed by ordinary distillation. Separate, both academic research and practical application value. Batch extractive distillation is to increase the re...
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IPC IPC(8): B01D3/40C07C15/04C07C13/18C07C7/08
Inventor 李文秀张志刚贾庆波连利燕刘雷
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY