Separating and recycling method and device for solvent-water mixture containing impurities prone to scale formation

A separation recovery and mixture technology, applied in the purification/separation of oxygenated compounds, separation method, separation/purification of carbonyl compounds, etc., can solve the problems of easy blockage of reboiler, high energy consumption, low yield, etc., and achieve The effect of reducing steam consumption, saving steam consumption, and reducing emissions

Active Publication Date: 2016-02-24
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, for the isopropanol-water mixed solution containing impurities (such as protein and salt impurities) that are easy to scale, the current technology is that the material is distilled in the rectification tower, and the concentrated isopropanol is evaporated from the top of the tower to be recycled. For environmental protection, the waste water from the tower kettle is directly discharged to environmental protection. The process is operated under normal pressure and reduced pressure. The rectification tower adopts a plate tower. Due to the generation of scaling, the plate is easily blocked, and the reboiler at the bottom of the tower is also easily blocked. , so that the production is unstable and the energy consumption is high and the yield is low, which affects the stable production

Method used

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  • Separating and recycling method and device for solvent-water mixture containing impurities prone to scale formation
  • Separating and recycling method and device for solvent-water mixture containing impurities prone to scale formation

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Embodiment approach 1

[0050] figure 1 A structural schematic diagram of a specific embodiment 1 of a separation and recovery device for a solvent-water mixture containing impurities prone to fouling is provided. The device includes a vacuum stripping unit 100 and a rectification unit 200 connected in sequence, and the rectification unit 200 is connected with The heat supply unit 400 that provides heat for the device, the heat exchange unit 300 is set between the vacuum stripping unit 100 and the rectification unit 200, the heat exchange unit 300 is used to collect the latent heat of condensation of the product of the rectification unit 200 as a vacuum lift The heat source of distillation unit 100. The waste water can be recovered from the vacuum stripping unit 100 and the rectification unit 200 , and the required solvent product can be obtained from the heat exchange unit 300 .

specific Embodiment approach 2

[0052] figure 2A schematic structural diagram of the second embodiment of a separation and recovery device for a solvent-water mixture containing impurities prone to fouling is provided, as described in the first embodiment, wherein the vacuum stripping unit includes: a vacuum stripping tower 101 , feed pump 102, condensation preheater 103, hot water preheater 104, tower top condenser 105, waste water pump 106; Described rectification unit comprises: rectification tower 201, condensation water preheater 202, rectification A kettle liquid preheater 203; the heat exchange unit includes: a falling film evaporator 301, a circulation pump 302, a liquid phase reflux tank 303, and a discharge pump 304; the heat supply unit is a reboiler 401.

[0053] The feed liquid is sent into the condensation preheater 103 and the hot water preheater 104 by the feed pump 102, and is sent to the feed port of the vacuum stripping tower 101 after two-stage preheating; Out into the tower top condens...

Embodiment 1

[0059] Utilize the separation and recovery device of the solvent-water mixture containing the easy-to-scale impurities provided by the second embodiment to separate the isopropanol-water mixture containing the easy-to-scale impurities, including the following steps:

[0060] 1. The feed liquid with a mass content of isopropanol of 5% is sent to the vacuum stripping tower, and the temperature is 55°C after secondary preheating; the operating pressure of the vacuum stripping tower is 15kPa, and the temperature of the top material is 50 °C, the reflux ratio is 2, and the reflux temperature is 40 °C;

[0061] 2. The top of the vacuum stripping tower is extracted and sent to the rectification tower, and the temperature is 90°C after two-stage preheating; the operating pressure of the rectification tower is 120kPa, the temperature of the top material is 85°C, and the reflux ratio is 2 , The reflux temperature is 60°C;

[0062] 3. Obtaining mass fraction after rectification is 80% i...

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Abstract

The invention relates to a separating and recycling method and device for a solvent-water mixture containing impurities prone to scale formation. The method comprises the following steps that 1, decompression stripping operation is performed on the solvent-water mixture containing the impurities prone to scale formation; 2, rectification operation is performed on a product obtained through decompression stripping operation to obtain a solvent product with the mass percent more than 80%. The impurities prone to scale formation in the solvent-water mixture containing the impurities prone to scale formation comprise proteins and salts. According to the method and device, the problem that the impurities in the material liquid are prone to scale formation to block a column plate or packing is successfully solved, and the cleanliness of the interior of a rectifying column is guaranteed; the steam using amount is decreased; meanwhile, the wastewater draining amount is decreased, and high efficiency, energy conservation and environmental protection are achieved.

Description

technical field [0001] The invention belongs to the technical field of solvent-water mixture separation, and relates to a method and device for separating and recovering a solvent-water mixture containing impurities prone to fouling. Background technique [0002] A large amount of industrial wastewater will be produced in industrial production. If these industrial wastewater are discharged directly, on the one hand, it will seriously pollute the environment; on the other hand, it will cause serious waste. Therefore, it is necessary to recycle organic solvents in industrial wastewater before discharge. Among them, the solvent relates to acetone, ethanol, methanol, isopropanol, especially relates to isopropanol. [0003] As an organic solvent and chemical raw material with excellent performance, isopropanol is widely used in the fields of pharmaceuticals, cosmetics, plastics, spices, coatings, electronics, etc., so a large amount of industrial wastewater containing isopropano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/10C07C29/80C07C31/04C07C31/08C07C45/82C07C49/08C07B63/00C07C27/28B01D3/10B01D3/14
CPCB01D3/10B01D3/143C07B63/00C07C29/80C07C45/82C07C31/10C07C31/04C07C31/08C07C49/08
Inventor 王荣良王洪海赵寒梅祁建超靳红星李春利
Owner HEBEI UNIV OF TECH
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