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在工业生产中,传统的制氮方法是深冷空气分离法,装置复杂、操作麻烦、投资费用高。用分子筛变压吸附分离空气制备氮气是一种新的制氮技术。它又可分为两种,一种是沸石分子筛(MsZ-5A)法,另一种是碳分子筛(MSC)法。它们都是利用分子筛对气体分子的吸附和脱附作用将空气分离,而获得高纯度的氮气。两者比较,碳分子筛(MSC)法具有如下的优点:(1)能耗小 5A分子筛优先吸附氮,而碳分子筛优先吸附氧,因空气中的氮量约为氧量的四倍,故在同样采用真空泵脱附时,碳分子筛制氮装置所需真空泵容量小,电耗低。
In industrial production, the traditional method of nitrogen production is cryogenic air separation, the device is complicated, the operation is troublesome, and the investment cost is high. Molecular sieve pressure swing adsorption separation of air to produce nitrogen is a new nitrogen production technology. It can be divided into two kinds, one is zeolite molecular sieve (MsZ-5A) method, and the other is carbon molecular sieve (MSC) method. They are the use of molecular sieve gas molecules adsorption and desorption of air separation, and high purity nitrogen. Compared with the two, the MSC method has the following advantages: (1) 5A molecular sieve with low energy consumption preferentially adsorbs nitrogen, and carbon molecular sieve preferentially adsorbs oxygen because the amount of nitrogen in the air is about four times that of oxygen, The same vacuum pump desorption, carbon molecular sieve nitrogen device required vacuum pump capacity, low power consumption.