Low Pressure Nitrogen Press

A steel-making user of DEAR air separation set up their air separation plant in the early stage. At that time, due to the small amount of nitrogen required by the process and in order to reduce the investment, the molecular sieve adsorption purification process of 1:1 oxygen and nitrogen was adopted. There was no water chiller equipped, and a large amount of crude nitrogen was extracted to the water cooling column to reduce the temperature of cooling water.

Carbon molecular sieve (CMS) is a new type of non-polar adsorbents, which has the performance of absorbing oxygen molecules in the air under normal temperature and pressure, thus obtaining nitrogen-rich bodies. The most remarkable feature of adopting the new nitrogen production technology of carbon molecular sieve pressure changing absorption method is: the impurity content of N2 product is low, the concentration of N2 and the gas volume can be adjusted arbitrarily according to the need, and high purity N2 with O2 content less than 5PPm and dew point less than-60℃ can be obtained through refining. In 1960s, carbon molecular sieve was firstly manufactured successfully in America and was promoted and applied soon. At first, carbon molecular sieve was used as the absorbant to separate oxygen from the air, and later it was gradually applied to the equipment for producing nitrogen. By the end of 1970s S and the beginning of 1980s S, the demand for nitrogen in various countries around the...