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Vacuum cooling crystallization method

A vacuum cooling and crystallization technology, which is applied in crystallization separation, solution crystallization, separation methods, etc., can solve the problems of low energy efficiency, achieve significant economic benefits, avoid explosive nucleation, and reduce processing costs

Inactive Publication Date: 2019-04-26
天津乐科节能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steam jet pump needs high-pressure raw steam as the driving energy, and generates negative-pressure exhaust steam, which needs to consume a large amount of cooling water to cool the negative-pressure exhaust steam. The energy efficiency of the whole process is low, only 20% to 30%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add the mixed aqueous solution of sodium nitrate and potassium chloride at a temperature of 85°C to the crystallizer, and the feeding amount is 30m 3 , The crystallizer is a wenson batch vacuum crystallizer, and the body of the crystallizer container is lined with Q235-A rubber. The compressor adopts LC20000 type Roots compressor, and the motor power of the compressor is 280kW, and it is driven by frequency conversion. Turn on the vacuum pump and compressor, and the compressor sucks the steam in the crystallizer. When the temperature drops to 80°C, the potassium nitrate in the solution reaches saturation and begins to crystallize. The water in the crystallizer vaporizes and flashes, forming secondary The steam enters the compressor to be compressed, and the heated secondary steam enters the condenser to condense, and the condensate of the formed secondary steam is discharged into the condensate tank, and the non-condensable gas in the system is discharged from the syste...

Embodiment 2

[0027] Add the mixed aqueous solution of magnesium nitrate and potassium chloride at a temperature of 90°C to the crystallizer, and the feeding amount is 30m 3 , The crystallizer is a wenson batch vacuum crystallizer, and the body of the crystallizer container is lined with Q235-A rubber. The compressor adopts LC20000 type Roots compressor, and the motor power of the compressor is 280kW, and it is driven by frequency conversion. Turn on the vacuum pump and compressor, and the compressor sucks the steam in the crystallizer. When the temperature drops to 80°C, the potassium nitrate in the solution reaches saturation and begins to crystallize. The water in the crystallizer vaporizes and flashes, forming secondary The steam enters the compressor to be compressed, and the heated secondary steam enters the condenser to condense, and the condensate of the formed secondary steam is discharged into the condensate pipe, and the non-condensable gas in the system is discharged from the sy...

Embodiment 3

[0029] Add the mixed aqueous solution of ammonium nitrate and potassium chloride at a temperature of 105°C to the crystallizer, and the feeding amount is 30m 3 , The crystallizer is a forced external circulation vacuum crystallizer, and the body of the crystallizer container is lined with Q235-A rubber. The compressor adopts LC20000 type Roots compressor, and the motor power of the compressor is 280kW, and it is driven by frequency conversion. Turn on the vacuum pump and compressor, and the compressor sucks the steam in the crystallizer. When the temperature drops to 80°C, the potassium nitrate in the solution reaches saturation and begins to crystallize. The water in the crystallizer vaporizes and flashes, forming secondary The steam enters the compressor to be compressed, and the heated secondary steam enters the condenser to condense, and the condensate of the formed secondary steam is discharged into the condensate tank, and the non-condensable gas in the system is dischar...

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Abstract

The invention discloses a vacuum cooling crystallization method. The vacuum cooling crystallization method comprises the following steps: 1) adding a to-be-crystallized liquid into a crystallizer, turning on a compressor and a vacuum pump, enabling the compressor to suck steam in the crystallizer so that moisture in the crystallizer is vaporized and flash-evaporated, wherein the compressor is controlled by using variable frequency; 2) enabling the secondary steam formed by flash-evaporation to enter the compressor for compression and heating, then enabling the heated steam to enter a condenserfor condensation, discharging a condensate that forms secondary steam into a condensation water tank, discharging a non-condensable gas in the system out of the system through the vacuum pump; and 3)turning off the compressor and the vacuum pump after the crystallization process is completed. According to the vacuum cooling crystallization method disclosed by the invention, the variable frequency speed control technology is adopted by the compressor, the cooling rate of the feed liquid can be accurately controlled, the burst nucleation is prevented, the crystal size is uniform and the product quality is stable. The steam jet pump cooling crystallization method is only suitable for crystallization of substances with rapid nucleation rate and less strict requirement for crystal grain size,and the method disclosed by the invention is stronger in adaptability and wider in application range.

Description

technical field [0001] The invention belongs to the technical field of crystallization methods, and in particular relates to a vacuum cooling crystallization method. Background technique [0002] Cooling crystallization is one of the most commonly used methods in industrial crystallization. Most of the traditional cooling crystallization devices use jackets or snake tubes to cool and crystallize. This method has large water consumption, serious scaling, low heat transfer coefficient, and uneven cooling. Shortcomings such as unstable product quality. In order to overcome the above shortcomings, vacuum cooling crystallization is mostly used in modern crystallization industry. The basic principle of vacuum cooling is to use vacuum to reduce the pressure of the process solution and the boiling point of the solution. In this way, the solution evaporates water under low pressure. While absorbing the heat of the solution itself, the thermodynamic energy of the solution is reduced,...

Claims

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Application Information

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IPC IPC(8): B01D9/00B01D9/02C01G49/14C01D5/00
CPCB01D9/0022B01D2009/0086C01D5/00C01G49/14
Inventor 夏君君
Owner 天津乐科节能科技有限公司
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