There is nothing in the Quran that suggests that a husband is allowed to beat his wife. She is to be honored and treated kindly, even when one no longer feels love in one's heart towards her.

Intercourse may be an act of worship if the intention behind it is to fulfill the rights of one's wife, to treat her kindly as enjoined by Allah, to seek a righteous child, to keep oneself or one’s wife chaste, to prevent both partners from looking towards or thinking of prohibited things, and other good intentions.