Abstract: This application discloses a packet loss management method. The method includes: A controller determines, based on a network quality requirement of service traffic and a network quality parameter of each segment link on a forwarding path of the service traffic, a packet loss concealment policy that needs to be executed on each segment link on the forwarding path, and delivers the packet loss concealment policy for each segment link to a forwarding node, and the forwarding node executes the corresponding packet loss concealment policy.

Abstract: This invention discloses an approach for the separation of the close-boiling mixture of polyols. The raw material is ethylene glycol containing miscellaneous polyols (such as 1,2-propylene glycol and 1,2-butanediol). Over an acid catalyst, these miscellaneous polyols, through (1) a dehydration reaction, (2) pinacol rearrangement, and (3) acetalization or ketalization reaction, are converted into aldehydes (small amounts), acetals, and ketals (trace amount), which are simultaneously and readily separated via distillation. Meanwhile, after the reaction, the mixture is further separated to obtain an ethylene glycol product at a high purity. The invention provides a technique to remove the miscellaneous polyols from ethylene glycol via liquid-phase dehydration reactions under mild conditions, with low energy consumption. In particular, this approach is markedly effective for the removal of 1,2-butanediol that is difficult to be removed via conventional techniques.