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A method for producing ultrapure ammonia

A technology of ultra-pure ammonia water and ultra-pure water, which is applied in the preparation/separation of ammonia, etc. It can solve the problems of huge investment in absorption and desorption equipment, potential safety hazards, high energy consumption and danger of distillation high-temperature operation, and achieve compact equipment structure , no discharge of three wastes, and the effect of meeting environmental protection requirements

Inactive Publication Date: 2011-12-14
SHANGHAI HABO CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the purification of sodium and arsenic ion impurities using multi-stage distillation or absorption and desorption to produce products with impurities ≤ 0.1ppb has relatively high energy consumption and danger. Security risks

Method used

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  • A method for producing ultrapure ammonia
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Embodiment 1

[0020] A method for producing ultrapure ammonia, its flow process is as follows figure 1 As shown, the method includes the following steps:

[0021] The ammonia gas volatilized in the liquid ammonia container 1 is input into the ultrasonic purification tower 2, the temperature of the ultrasonic purification tower is controlled to be ≥0°C, the pressure is controlled to be ≥0.08Mpa, and the targeted pretreatment agent persulfuric acid is added to the ultrasonic purification tower 2 Ammonium and ammonium persulfate are added in an amount of 0.01% of the weight of the ammonia gas passing through the ultrasonic purification tower, and are used to complex volatile impurities in the ammonia gas that have an impact on the quality of the end product. A large number of fine ammonia water particles are produced in the ultrasonic purification tower 2 through the ultrasonic atomizer 3, the particle size distribution of the ammonia water particles is basically 0.1 to 30 μm, and the weight r...

Embodiment 2

[0023] A method for producing ultrapure ammonia, the method comprises the following steps:

[0024] The ammonia gas volatilized in the liquid ammonia container is input into the ultrasonic purification tower, the temperature of the ultrasonic purification tower is controlled at 20°C, and the pressure is controlled at 0.3Mpa, and the targeted pretreatment agent hydrogen peroxide, hydrogen peroxide is added to the ultrasonic purification tower The addition amount is 0.1% of the weight of the ammonia gas passing through the ultrasonic purification tower, and is used to complex the volatile impurities in the ammonia gas that have an impact on the quality of the end product. A large number of fine ammonia water particles are produced in the ultrasonic purification tower through an ultrasonic nebulizer, and the particle size distribution of the ammonia water particles is basically 0.1-30 μm. The huge surface area of ​​the particles absorbs more impurities contained in the ammonia ga...

Embodiment 3

[0026] A method for producing ultrapure ammonia, the method comprises the following steps:

[0027] The ammonia gas volatilized in the liquid ammonia container is input into the ultrasonic purification tower. The temperature of the ultrasonic purification tower is controlled to be ≤50°C and the pressure is controlled to be ≤0.8Mpa. The targeted pretreatment agent phosphoric acid is added to the ultrasonic purification tower. The amount of phosphoric acid added It is 1% of the weight of the ammonia gas passing through the ultrasonic purification tower, and is used to complex the volatile impurities in the ammonia gas that have an impact on the quality of the end product. A large number of fine ammonia water particles are produced in the ultrasonic purification tower through an ultrasonic atomizer. The particle size distribution of the ammonia water particles is basically 0.1-30 μm. The weight ratio of the ammonia water particle production to the ammonia gas passing through the u...

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Abstract

The invention relates to a method for producing ultrapure ammonia water. The liquid ammonia is gasified and the ammonia gas is introduced into an ultrasonic purification tower. The ultrasonic purification tower is provided with an ultrasonic nebulizer and ultrapure water. The ultrasonic nebulizer produces fine ammonia water particles for adsorption Impurities in the ammonia gas, the obtained purified ammonia gas is filtered through a filter and enters the product absorption tower, and the ammonia gas is combined with the ultrapure water in the product absorption tower to obtain ultrapure ammonia water. Compared with the prior art, the invention is suitable for producing ultra-pure ammonia water products, and at the same time by-products industrial grade ammonia water products. The ultra-pure ammonia water product obtained by adopting the present invention meets the following indicators: ammonia water content ≥ 28%, single anion impurity ≤ 10ppb, single cation impurity ≤ 0.1ppb, industrial grade ammonia water content ≥ 28%, safe and reliable process, compact equipment structure, low energy consumption, At the same time, there is no discharge of three wastes in production, which meets the requirements of environmental protection.

Description

technical field [0001] The invention relates to a method for producing ammonia water, in particular to a method for producing ultrapure ammonia water. Background technique [0002] The production of ultra-pure ammonia water has multi-stage distillation, absorption and desorption methods, etc., but not all ionic impurities can be purified by the above methods or can economically reach the required purification level. For example, the purification of sodium and arsenic ion impurities using multi-stage distillation or absorption and desorption to produce products with impurities ≤ 0.1ppb has relatively high energy consumption and danger. Security risks. In order to solve the defects existing in the existing technology, the technical invention developed has the advantages of high quality, low energy consumption, environmental protection and safety. Contents of the invention [0003] The purpose of the present invention is exactly to provide a kind of process safe and reliabl...

Claims

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Application Information

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IPC IPC(8): C01C1/02
Inventor 孙宏华王学敏高春玲李自吉
Owner SHANGHAI HABO CHEM TECH
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