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Rectification-steam penetration-coupled organic solvent dewatering method and device

An organic solvent and permeation device technology, applied in the field of separation, can solve the problems of unrealized energy coupling, low resource utilization and dehydration efficiency, and achieve clean production and resource recycling, improve energy utilization, and reduce production The effect of energy consumption

Active Publication Date: 2013-05-01
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For dehydration of organic solvents with high water content, Chinese patent CN102260140A (new process for producing absolute ethanol by rectification pervaporation method) obtains 95% ethanol through rectification of ethanol solution, and then heats it to 88 ℃ ~ 91 ℃ to enter pervaporation Membrane modules are used for separation. This method does not add a third component to obtain absolute ethanol, but it needs to condense the overhead distillate of the rectification tower, and then perform pervaporation dehydration after reheating. The two processes are operated separately without energy coupling. Low resource utilization and dehydration efficiency

Method used

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  • Rectification-steam penetration-coupled organic solvent dewatering method and device
  • Rectification-steam penetration-coupled organic solvent dewatering method and device

Examples

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Effect test

Embodiment 1

[0034] See figure 1 , the coupling of rectification and steam permeation separation is used in the organic solvent dehydration process, and the steps are as follows:

[0035] The ethanol solution with a water content of 90wt.% and a flow rate of 100kg / h is transported from the raw material tank 1 to the preheater 3 through the raw material pump 2. After being preheated by the product steam, the temperature rises to 90°C and enters the rectification tower 4. The height of the rectification tower is 3.5m, with built-in metal packing, heated by the reboiler 10 in the tower, the reflux ratio at the top of the rectification tower is controlled to be 2.5, the operating pressure is 0.12MPa (gauge pressure), and the steam at the top of the tower passes through the partial condenser 5 After condensation, part of it is refluxed to the rectification tower, and the other part is obtained as ethanol vapor (distillate) with a water content of 20wt.%, 12.38 kg / h, and a temperature of 123°C....

Embodiment 2

[0038] See figure 1 , the coupling of rectification and steam permeation separation is used in the organic solvent dehydration process, and the steps are as follows:

[0039] The methanol solution with a water content of 35wt.% and a flow rate of 80 kg / h is transported from the raw material tank 1 to the preheater 3 through the raw material pump 2. After being preheated by the product steam, the temperature rises to 65°C and enters the rectification tower 4. The height of the rectification tower is 3.5m, with built-in metal packing, heated by the reboiler 10 in the tower, the reflux ratio at the top of the rectification tower is controlled to be 0.5, the operating pressure is 0.12MPa (gauge pressure), and the steam at the top of the tower passes through the partial condenser 5 After condensing, part of it is refluxed to the rectification tower, and the other part is obtained as methanol vapor (distillate) with a water content of 5wt.%, 54.67 kg / h, and a temperature of 87°C. ...

Embodiment 3

[0042] See figure 1 , the coupling of rectification and steam permeation separation is used in the organic solvent dehydration process, and the steps are as follows:

[0043] The acetone solution with a water content of 65wt.% and a flow rate of 100kg / h is transported from the raw material tank 1 to the preheater 3 through the raw material pump 2. After being preheated by the product steam, the temperature rises to 90°C and enters the rectification tower 4. The height of the rectification tower is 3.5m, with built-in metal packing, heated by the tower kettle reboiler 10, the reflux ratio at the top of the rectification tower is controlled to be 1.1, the operating pressure is 0.12MPa (gauge pressure), and the steam at the top of the tower passes through the partial condenser 5 After condensing, part of it was refluxed to the rectification tower, and the other part was obtained as acetone vapor (distillate) with a water content of 7wt.% and 37.5 kg / h at a temperature of 79°C. ...

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Abstract

The invention relates to a rectification-steam penetration-coupled organic solvent dewatering method and a rectification-steam penetration-coupled organic solvent dewatering device, belonging to the technical field of separation. The rectification-steam penetration-coupled organic solvent dewatering method comprises the step of sending an aqueous organic solvent into a rectifying tower, wherein at least one part of steam at the top of the rectifying tower is not condensed and is directly separated by a steam penetrating device, a penetrated side is water and an intercepted side is organic solvent. The rectification-steam penetration-coupled organic solvent dewatering device comprises a raw material tank, a raw material pump, a preheater, the rectifying tower and the steam penetrating device which are sequentially connected, wherein the top of the rectifying tower is directly connected with the steam penetrating device. Compared with the prior art, in the organic solvent dewatering process, a third component is not added, so that environmental pollution caused by the third component and the retreatment cost of the third component are eliminated, an azeotropic rectification process and an extractive rectification process are omitted, condensation of a product at the top of the rectifying tower and re-evaporation in the steam penetrating device are omitted, energy consumption is lowered and the product quality is improved.

Description

[0001] technical field [0002] The invention relates to a method and a device for dehydrating an organic solvent, in particular to a method for dehydrating an organic solvent coupled with a steam permeation process and a device used, and belongs to the field of separation technology. [0003] Background technique [0004] With the rapid development of industry, various organic solvents are widely used, including chemical solvents such as alcohols, esters, ketones, ethers, and aromatic compounds, which are used in energy, medicine, biology and other fields, and play an important role in the national economy. effect. [0005] Organic solvent dehydration is an important link in the production and use of organic solvents. Traditional separation methods mainly include general chemical methods, adsorption methods, and rectification methods. Most organic solvents and water form azeotropes or near-boilers, and it is difficult to remove water by ordinary distillation techniques. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01D61/36
Inventor 顾学红余从立王进明庆祖森
Owner JIANGSU NINE HEAVEN HIGH TECH
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