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Method for preparing high-concentration ammonia by separating and purifying low-concentration aqueous ammonia

A low-concentration, high-concentration ammonia technology, applied in the preparation/separation of ammonia, can solve the problem of producing a large amount of dilute ammonia water, and achieve the effects of not causing pipeline blockage, low equipment investment cost, and high separation and purification efficiency.

Active Publication Date: 2013-05-22
XIAMEN HUANKANG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-efficiency method for separating and purifying low-concentration ammonia water to prepare high-concentration ammonia in order to solve the problems of producing a large amount of dilute ammonia water in the existing waste ammonia gas recovery.

Method used

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  • Method for preparing high-concentration ammonia by separating and purifying low-concentration aqueous ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Operate according to process steps 1) to 8), and the control parameters are as follows: Step 2) The preset initial temperature of the heating tank is 46°C, Step 4) The vacuum degree outside the membrane still is maintained at 0.03-0.06MPa, and Step 5) The heating rate is set to 2 °C / 10min, step 8) The preset termination temperature of the heater is 88 °C. When the initial concentration is 20.07%, the water content of ammonia gas after separation is 1.30%, see Table 1.

[0047] Table 1 Changes in moisture content of ammonia gas under programmed temperature rise mode

[0048] Example

Embodiment 2

[0050] Operate according to process steps 1) to 8), and the control parameters are as follows: step 2) the preset initial temperature of the heater is 46°C, step 4) maintain the vacuum degree outside the membrane still at 0.03 ~ 0.06MPa, step 5) set the heating rate to 6 °C / 10min, step 8) The preset termination temperature of the heater is 88 °C. When the initial concentration is 20.03%, the water content of ammonia gas after separation is 1.43%, see Table 1.

Embodiment 3

[0052]Operate according to process steps 1) to 8), and the control parameters are as follows: step 2) the preset initial temperature of the heater is 46°C, step 4) maintain the vacuum degree outside the membrane still at 0.03 ~ 0.06MPa, step 5) set the heating rate to 6 °C / 10min, step 8) The preset termination temperature of the heater is 88 °C. When the initial concentration is 19.87%, the water content of ammonia gas after separation is 1.15%, see Table 1.

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Abstract

The invention provides a method for preparing high-concentration ammonia by separating and purifying low-concentration aqueous ammonia and relates to separation and purification of aqueous ammonia. The method comprises the following steps of: turning on a circulating pump and carrying out circulating cooling to a pre-separator by the ice water in a chiller; injecting the dilute aqueous ammonia into a temperature control heater and heating the dilute aqueous ammonia; turning on a vacuum pump and adjusting to the preset vacuum degree for vacuumizing a film distiller; rising the temperature of the dilute aqueous ammonia by the temperature control heater according to the set heating rate to the preset final temperature; cooling and separating out water drops after the ammonia / water vapor generated by heating the dilute aqueous ammonia in the temperature control heater enters into the pre-separator; discharging the water dops in condensation from the lower part to a condensate water receiver and discharging the ammonia vapor from the outlet at the upper part to the inner side of the film distiller; making the ammonia of the ammonia vapor entering into the inner side of the film distiller enter into the outer side of the film under the action of negative pressure, and taking out by the vacuum pump to an ammonia receiver to obtain high-purity ammonia; insulating after the temperature of the temperature control heater rises to the preset final temperature, stopping heating and vacuumizing; and discharging the residual aqueous ammonia from the temperature control heater for ammonia absorption in the waste ammonia after the heat exchange.

Description

technical field [0001] The invention relates to the separation and purification of ammonia water, in particular to a method for preparing high-concentration ammonia by separating and purifying low-concentration ammonia water (ammonia content>97%). Background technique [0002] During the production and use of liquid ammonia in the chemical industry, due to the volatility of ammonia, a large amount of ammonia gas is discharged into the air through the equipment vent pipe. In order to avoid the pollution of waste ammonia gas and waste of resources, it can be recycled in a reasonable way. [0003] The applicant discloses a method for recycling ammonia in industrial waste gas in Chinese patent CN102068880A. The dilute ammonia water obtained has certain commercial value, and can be purified by refining distillation to prepare liquid ammonia. To obtain high-purity liquid ammonia, this fine distillation method has the following defects: when the concentration of dilute ammonia w...

Claims

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Application Information

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IPC IPC(8): C01C1/10
Inventor 陈瑞坚
Owner XIAMEN HUANKANG ENVIRONMENTAL PROTECTION TECH
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