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Production process and preparation method of ultrapure ammonia

A production process, a technology for ultra-pure ammonia, which is applied in the preparation/separation of ammonia, chemical industry, sustainable manufacturing/processing, etc., can solve the problems of long-term stability of ammonia purity, low energy utilization rate, and high power consumption, and achieve energy efficiency. Reduced power consumption, high degree of automation and good safety performance

Inactive Publication Date: 2012-06-20
李森
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The process is long, the energy utilization rate is low, and the power consumption is high
[0006] (2) The purity of product ammonia cannot be stabilized above 7N for a long time

Method used

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  • Production process and preparation method of ultrapure ammonia
  • Production process and preparation method of ultrapure ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of ultrapure ammonia production technique, is characterized in that:

[0024] The raw material ammonia is pumped into the rectification tower. The pressure of the rectification tower is controlled at 1.3-1.5Pa, and the rectification temperature is controlled at about 60°C. Light components and some impurities such as water are removed. ≦100ppm, when the total content of light components is less than 10ppb, recover the cooling capacity, and then enter the oil and water remover after recovering the cooling capacity, control the temperature at 50-55°C, and the pressure within the range of 1.2-1.3 Pa. , when the water content is ≦100ppb, it enters the terminal purification device. The temperature in the control device is within the range of 40-50°C and the pressure is within the range of 1.0-1.2 Pa. After deep removal of water and impurities, the gas ammonia is condensed and then enters the product ammonia tank. Obtain ultra-pure ammonia product.

[0025] A kind of ...

Embodiment 2

[0028] see figure 1 , in this process, the raw material ammonia tank (1), liquid ammonia pump (2), rectification tower (3), oil and water remover (4) are connected with 304 stainless steel pipes and valves, and the terminal purification device ( 5), Condenser (6), product ammonia tank (7) are connected with 316L stainless steel (inner wall electropolished) pipes and valves. The system adopts DCS automatic control. After the rectification tower (3), the total content of light components is less than 10ppb; the water content after the oil and water remover (4) is less than 100ppb; the water content after the terminal purification device (5) is less than 1ppb, and the ammonia content is greater than 7N.

[0029] The process flow of the present invention: the liquefied ammonia in the raw material ammonia tank (1) is pressurized by the pump (2) and enters the rectification tower (3), removes light components and part of the water, enters the oil and water remover (4), and further...

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PUM

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Abstract

The invention relates to a production process of ultrapure ammonia, which includes that raw material ammonia is pumped into a rectification column, enters a deoiling and dewatering device after impurities such as light components, part of water and the like are removed and cold energy is recovered, and enters a terminal purifying device after most of water is removed, and gaseous ammonia with water and impurities deep removed is condensed and enters an ammonia product cylinder so as to obtain the ultrapure ammonia product. The production process is simple in procedure and economical in investment and system energy is optimized, energy consumption can be reduced by 40%, and purity of the ammonia product can be stably kept more than 7N (99.99999%) for a long time.

Description

technical field [0001] The invention relates to the field of special gas production, in particular to an ultra-pure ammonia production process and a preparation method thereof. Background technique [0002] Ultra-pure ammonia is a high-tech product that uses advanced equipment and technology to deep-process industrial liquid ammonia to make ammonia purity above 6N (99.9999%). It is one of the main raw materials for solar photovoltaic and LED products. Due to the late start of research on ultra-pure ammonia in my country and the low level of technology, domestic electronic-grade ultra-pure ammonia basically relies on imports. [0003] At present, the main technological process for producing ultra-pure ammonia is as follows: use industrial liquid ammonia as raw material, filter to remove oil and metal impurities, enter the vaporizer, enter the first-level purifier (oil and water removal) after vaporization, and condense and refine Distillation tower removes H 2 , O 2 , N 2...

Claims

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Application Information

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IPC IPC(8): C01C1/02
CPCY02P20/50
Inventor 李森
Owner 李森