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Membrane Nitrogen Generator Excellent Performance And Easy Maintenance
Jul 20, 2017

Membrane Membrane Nitrogen Generator in the use of the process encountered two more common, one is difficult to guarantee the reliability of the two. Its reliability is difficult to ensure that the performance of some of the generators in the purity is not enough, nitrogen and hydrogen in the water content is high and also with a certain degree of corrosion, if the operation will have a return phenomenon occurs.

The above situation will cause the chromatograph is not easy to stabilize and column efficiency and other phenomena, serious gas and column can be scrapped, and even lead to all scrapped scraper.

Second, the use of the process of security problems, some of the Membrane Membrane Nitrogen Generator compressor in the course of the use of overheating, gas into the oil, leakage and so on. Not only damage to the chromatograph, serious will endanger the safety of the operator.

Because, the chromatograph using high purity nitrogen or high purity hydrogen as the carrier gas, in order to deal with the above problems, we from the hydrogen generator, Membrane Nitrogen Generator and compressor safety and reliability of the three aspects of a few lessons for your reference. Air as auxiliary gas, its purity is not high, after dehydration degreasing can basically meet the chromatographic analysis requirements, so today no longer detailed analysis.

The working principle of the Membrane Nitrogen Generator is roughly divided into three types:

1. The combination of electrochemical separation and physical adsorption

2. Separation by hollow fiber membrane

3. Separation by a new synthetic molecular sieve using gas chromatography

Electrochemical separation and physical adsorption:

The use of this principle produces a lot of nitrogen problems. The main questions are:

1. The Membrane Nitrogen Generator of the KOH aqueous solution produces high moisture content and is corrosive in nitrogen.

2. There is a return phenomenon.

3. Nitrogen purity is low, the thermal conductivity of the detector thermal conductivity detector will cause oxidation, a long time the thermal conductivity detector sensitivity.

In view of the above three points of the problem, many chromatan manufacturers, equipment dealers and maintenance personnel are not recommended to use the principle of generating Membrane Nitrogen Generator to do gas chromatograph carrier gas.

Using hollow fiber membrane method

Nitrogen film system can be low in the air from 78% to 95%, up to 99.9% of the pure nitrogen. The Membrane Nitrogen Generator can be used for gas chromatograph gas carrier, only applicable to the analysis of components of the composition of the industry is not demanding.

Separation of new synthetic molecular sieves by gas chromatography

This is a new type of air separation method, which uses compressed air as raw material, synthetic molecular sieve as adsorbent, gas chromatographic separation adsorption process, at room temperature and low pressure, the use of air oxygen and nitrogen in the molecular sieve diffusion rate is different Oxygen and nitrogen to be separated, nitrogen purity and gas production can be adjusted according to customer needs. The gas flow rate is stable, nitrogen purification is complete, the output nitrogen purity is high, the highest can get 99.9995% pure nitrogen, suitable for a variety of gas chromatography detector. The generator can produce high quality and high purity nitrogen, stable and reliable, and does not require any chemical consumables. Easy to operate, can be 24 hours unattended. And it can operate without any supervision and minimum maintenance without trouble.

In summary, the use of gas chromatography separation technology with synthetic molecular sieve separation method of Membrane Nitrogen Generator is superior to the use of electrochemical separation and physical adsorption and hollow fiber membrane method of Membrane Nitrogen Generator. It can be used at home and abroad various types of gas chromatograph used as carrier gas, is a good performance and easy maintenance of a new generation of Membrane Nitrogen Generator.

First of all, the hydrogen generator is mainly composed of electrolysis system, pressure control system, purification system and display system. Electrolysis using the current membrane separation technology, by the infrared photoelectric feedback device and switching power supply composed of pressure control system, so that the amount of hydrogen generated according to the needs of the output automatically adjust to maintain the output flow and pressure stability. The main problems with the use of hydrogen produced by this principle are:

1. Hydrogen generator with KOH aqueous solution produces high moisture content and is corrosive in hydrogen. It is easy to cause instability of chromatograph debugging. Once the hydrogen gas is used for a long time, the carrier gas will inevitably decrease.

2. The use of the principle of hydrogen generated if used for a long time, will cause serious back to the liquid phenomenon. In order to prevent back to the liquid, manufacturers designed a variety of devices to try to solve this problem, but can not solve the fundamental problem. After all, it is necessary to add liquid, once the anti-back to the device failure will cause the gas and column scrapped, serious or even lead to all the gas scrapped.

3. Most of the purity of the gas has not been tested, although it can be judged by the baseline and column life of its purity, the result is to the column caused unnecessary losses.

So the hydrogen as auxiliary gas is also OK, so that the carrier gas purity is not enough. In the choice of hydrogen generator priority given to the quality of the manufacturer, you can also install the online purity detection device to ensure the purity of the gas.