You want a daytime train from Shanghai to Beijing, right? It should be comfortable? Em, I think only the Train No.D32 can meet you needs. It departs from Shanghai at 10:50 and reaches Beijing South Railway Station at 20:32. Train No. D32 is a bullet train. It can help you save more time and also it's cleaner and more comfortable. The tiket cost is CNY542 or 452.

By the way ,actually, there are many other trains (including ordinary trains and bullet trains). However, the other bullet trains leave Beijing in the evening.If you choose ordinary train, the ticket cost is much cheaper but you will spend more time.