zeolite molecular sieves the gap with foreign countries is growing

zeolite molecular sieves the gap with foreign countries is growing. 1970s was the heyday of PSA oxygen air separation technology development, there are more than a dozen units have carried out  synthetic zeolite powder supplier experimental research PSA oxygen technology, the establishment of a number of sets of industrial test equipment. During this period the development of PSA oxygen equipment common in the following areas:
they use a higher than atmospheric grace molecular sieves  pressure adsorption, desorption atmospheric processes, adsorption tower has two to four;
 before the air enters the adsorber, after dehydration pretreatment;
Poor (3) equipment reliability, not continuous and stable operation, resulting in most of the equipment scrapped;
 technical, economic indicators lag behind.
1980s, the original PSA oxygen equipment in research and development unit of development projects have been suspended, the development of technology, PSA oxygen into the trough again.