ian 116024, China;\r2. Dalian Institute of Chem ical Physics, Chinese Academy of Sciences, Dalian 116023, China)\rAbstract: A novel nanofiltration concentration process for recovery of oligosaccharides from streamed soybean\rw aste w ater is explored. Technical flow and control requirements for 20 t/ h nanofiltration continuous process is\rintroduced. One process control system based on PLC w as designed. The control system is integrated by\rSiemens TP170B as human machine interface ( HM I) , S7200, DR20 and MM 430 as control center. It is proved\rby application in Shandong Gushen that the desig n can meet the technical requirements w ith av ailability, relia \rbility and efficiency .\rKey words: membrane separation; nanofiltration ( NF) ; soy oligosaccharide; process control; auto control
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