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Solvent reinforced transformation thermal coupling rectification system for separating cyclohexanone and phenol

A technology of solvent strengthening and rectification system, which is applied in the separation/purification, fractionation, and chemical industry of carbonyl compounds. It can solve problems such as inability to separate, difficult wastewater treatment, and inability to achieve efficient recovery of phenol, so as to reduce equipment investment and effectively Conducive to environmental protection, the effect of continuous distillation separation operation

Active Publication Date: 2013-04-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Cyclohexanone and phenol form the highest azeotrope with a phenol content of 72wt% under normal pressure, but its azeotropic composition is not sensitive to pressure changes, so the two cannot be completely separated by ordinary pressure swing rectification
U.S. Patent No. 2,762,760 uses water as an entrainer to realize the rectification and separation of cyclohexanone and phenol, but this process will produce a large amount of water / phenol minimum azeotrope, so the efficient recovery of phenol cannot be realized, and a large amount of phenol-containing Phenol wastewater will bring great difficulties to wastewater treatment

Method used

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  • Solvent reinforced transformation thermal coupling rectification system for separating cyclohexanone and phenol
  • Solvent reinforced transformation thermal coupling rectification system for separating cyclohexanone and phenol
  • Solvent reinforced transformation thermal coupling rectification system for separating cyclohexanone and phenol

Examples

Experimental program
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Effect test

example 1

[0053] use as figure 1 The shown twin-tower process flow is an example:

[0054] Phenol content is the cyclohexanone / phenol raw material solution F of 30wt%, and its flow rate is 3kg / h, and circulation stream B2 flow rate is 3.9kg / h, and two stream streams are sent into the first low-pressure rectification column that operating pressure is 3kPa simultaneously 1 is separated, and the tower top obtains the cyclohexanone product D1 that purity is 99.9wt%; The first low-pressure rectifying tower still outlet stream B1 is phenol and solvent azeotrope under 3kPa, and B1 stream will send into operating pressure It is separated by the 260kPa high-pressure rectification tower 2. Because phenol and solvent azeotrope form pressure sensitivity, the phenol content in the phenol and solvent azeotrope under 260kPa is obviously lower than 3kPa when phenol content, obtain the phenol product D2 that purity is 99.9wt% now at high pressure rectification column 2 tower tops, The bottom product s...

Embodiment 2

[0058] use as figure 2 The three-tower process flow shown as an example:

[0059] The raw material F is a cyclohexanone / phenol solution with a phenol content of 70%wt, and its flow rate is 3kg / h. F is sent into the first low-pressure rectification tower 1 that operating pressure is 3kPa simultaneously with the D3 solvent stream stream of 5kg / h with recirculation flow rate and separates, and the cyclohexanone product D1 that the tower top obtains purity is 99.9wt%, and tower kettle is extracted The phenol / solvent azeotrope B1 and stream B1 under this pressure will be sent to the subsequent double-column pressure swing rectification system to realize the recovery of phenol product and solvent.

[0060] In this follow-up double-tower pressure swing rectification system, B1 is first sent to the high-pressure rectification tower 2 with an operating pressure of 180kPa for separation. Under this pressure, the phenol content in the phenol / solvent azeotrope is significantly higher th...

example 3

[0064] Such as image 3 As shown, the thermal coupling technology can be implemented in the double-tower process, and the heat released by the condensation of steam at the top of the high-pressure tower can be used to provide heat for the bottom of the low-pressure tower to achieve energy saving and reduce equipment investment.

[0065] Among the figure, the first low-pressure rectification tower 1 is a low-pressure tower whose operating pressure is 3kPa, and the cyclohexanone product whose purity can reach 99.9wt% is extracted from the top of the tower, and the tower still is phenol and solvent azeotrope under this pressure, and the azeotrope The boiled matter is sent into the high-pressure rectification tower 2 whose operating pressure is 260kPa for separation. The phenol product with a purity of up to 99.9wt% is extracted from the top of the high-pressure rectification tower. Under this separation condition, the temperature of the steam at the top of the high-pressure rect...

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Abstract

The invention discloses a solvent reinforced transformation thermal coupling rectification system for separating cyclohexanone and phenol, wherein a feed port of a first low pressure rectification tower is connected with a cyclohexanone and phenol mixed solution raw material, one low pressure steam outlet of the first low pressure rectification tower is connected with a liquid phase reflux inlet and the other low pressure steam outlet is a cyclohexanone outlet after the low pressure steam outlets pass through a condenser of the low pressure rectification tower, a low pressure tower kettle outlet of the first low pressure rectification tower is connected with a first feed port of a high pressure rectification tower and an inlet of a reboiler of the first low pressure rectification tower respectively, an outlet of the reboiler of the first low pressure rectification tower is connected with a steam inlet of the first low pressure rectification tower, one high pressure steam outlet of the high pressure rectification tower is connected with a liquid phase reflux inlet of the high pressure rectification tower and the other high pressure steam outlet is a phenol outlet after the high pressure steam outlets pass through a condensation mechanism, a high pressure tower kettle outlet of the high pressure rectification tower is connected with a solvent circulation feed port and an inlet of a reboiler of the high pressure rectification tower respectively, and an outlet of the reboiler of the high pressure rectification tower is connected with a steam inlet of the high pressure rectification tower. According to the thermal coupling rectification system, the overall energy saving efficiency is up to 30-50%.

Description

technical field [0001] The invention relates to a thermal coupling rectification system. In particular, it relates to a solvent-enhanced pressure-swing heat-coupled rectification system for separating cyclohexanone and phenol by using a special solvent to realize the highest pressure-insensitive azeotrope. Background technique [0002] Phenol and cyclohexanone are important chemical raw materials. Cyclohexanone is a major intermediate in the manufacture of nylon, caprolactam, and adipic acid, and is also an important industrial solvent, such as used in paints, especially those containing nitrocellulose, vinyl chloride polymers and their copolymers, or methacrylate polymers paint. Phenol can be used as a fungicide, anesthetic, and preservative, and is used in the manufacture of phenolic resins, bisphenol A and caprolactam, of which more than 50% of phenol is used in the production of phenolic resins. [0003] Great progress has been made in the one-step oxidative cracking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01D3/32B01D3/42C07C45/82C07C49/403C07C37/74C07C39/04
CPCY02P20/10
Inventor 许春建李伟松石蕾焦红普
Owner TIANJIN UNIV
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