Technical Study On Dryer System Of ABS Plant Revamping Into Nitrogen Circulation

ABS resin is consist of acrylonitrile(AN).butadiene(BDE) and styrene(SM). It is that be measured by higher 50% of styrene , some butadiene and acrylonitrile . It' s have polystyrene' s nature of chatoyant and electricity, polybutadiene rubber ' s tenacity, low temperature function and easily processing behavior, and polyacrylonitrile's weather ability.heat resistance and endurable chemistry function. Now and within the scope of world it is widest ABS resin is an use, use to measure biggest engineering plastics, extensive used for the car, appliance, communication device and daily necessity etc.With the abroad ABS product compare, the color of local ABS product exsits some questions, such as yellow degree number is higher, especially the dryer system of ABS contain the safe question, therefore, open the research ABS equip dry system process, and it is a to bring up the valid solution especially very important with the meaningful issues. Pass by the analysis, ABS powder stop over in the dryer in the cent contact of dry process inside and air fully, ABS powder retention retains about 120 minutes, were oxidized by oxygen in the air to become yellow, like this of powder is with the SAN compound , the yellow degree number of ABS should be attain 30. ( yellow degree number of grain should lower 25). If the ASB powder pile up in the dryer , will can oxidized and detonation, Moreover, air is in the bag filter inside the current velocity is very quickly, with the bag filter rub to produce the static electricity, static electricity to turn on electricity to beat the spark, and spark fine ABS powder, and also cause to detonation.Known from analysis the oxygen in the air is main factor of the ABS powder change yellow degree and cause to detonation, if have no an oxygen, ABS powder can't become yellow, the dry system also can't detonation. System that yellow degree that adoption nitrogen circulation inliens the air is dry to make the ABS powder in the dry process not the contact air, it' s make ABS powder avoid detonation trouble.This issues research change water spraying tower detachs water of nitrogen circulation inliens , nitrogen the closeness the circulating usage, water tower adopt two classes cool off, first calss adopt circulating water, second class adopt freezing water. Pressure in the circulatory system adopt cent control, on time complement and discharge nitrogen . replace the bigger power blower, and increase blower outlet pressure, and overcome the cooling tower' s pressure resistance, then guarantee blower amount of the dry system can good solution ABS dry system problem.