When AOS is produced, the temperatures at the top of the sulfonation reactor, aging vessel and α-olefin inlet need to be decreased to ensure product stability. A chilling water unit is required. The chilling water unit consists of a chilling water group, chilling water tank, and two circulating pumps. One circulating pump transports the water to the chilling group, decreasing the temperature to the set point, then backflow to chilling water tank; the other circulating pump transports the chilled water to the user, then backflow to chilling water tank.
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