Chemical industry is the largest use of nitrogen machine equipment occupation, the current use of more is: polyvinyl chloride (PVC), purity of 99.5%, large flow. Polypropylene (PE), purity 99.9%, the flow rate is large, the commercial nitrogen is divided into two parts, one is the activator, the catalyst in the loading and empting demand of 99.9% nitrogen (small amount), reaction pot with 99.5% of nitrogen, the customary purity of 99.9%.

Polyethylene, aniline, purity 99.95%, petrochemical commodity aniline in catalyst regeneration with nitrogen is 4 times the usual, but the use of a short cycle.

Maleic anhydride and ethanol, usually purity of 99.9%, petrochemical products polyformaldehyde (current domestic manufacturers are not many, weak demand), purity of 99.9%.

Oil: can be used in the system of pipeline containers such as nitrogen purge, storage tank nitrogen filling, replacement, leak detection, flammable gas maintenance, also used in diesel hydrogenation and catalytic reforming, the purity is usually 99.9%.

Phthalic anhydride: 99% purity.

Polyester: The upstream material PTA (refined p-phenyldimethyl alcohol), the actual use of 95% purity, usually 99%.

In PTA production technology, high purity nitrogen gas is used to blow bubbles, measure the liquid level of ethylene glycol in the high and low temperature reaction kettle, measure the pressure difference between the high pressure end and the low pressure end, transport 4 ~ 20mA specification signal, and then convert it into the liquid level height. High purity nitrogen is used to measure the pressure of vacuum system, and high purity nitrogen is used to backblow the filter in PTA production technology. Polyester slicing is usually 99% to 99.999% according to the actual technology, and the downstream commodity filament and short filament slicing are 99.9 to 99.999%.

More typical uses:

Slouching of the air layer above the liquid; Blowout vessels, pipes, reactors and isolation chambers; Synthetic fiber spinning, drawing anti-chlorination, equipment anticorrosion; Nitrogen filling in paint production to avoid the polymerization of oil when drying; Supply maintenance gas to the tanker (nitrogen sealing and cleaning gas on the oil surface); Lazy gas supply for offshore engineering; Dry quenching, catalyst regeneration, oil fractionation, nitrogen fertilizer materials, catalyst maintenance, cleaning gas, rubber packaging and storage, tire production, etc. Nitrogen injection for oil production, etc.

Technical indicators:

· Gas production: 1~1000Nm3/h

· Purity: 95%-99.99%

· Dew point temperature: -45℃

· Outlet pressure: 0.1~1.0Mpa