Aye, when you use a touch spell that allows multiple touches, each touch is considered a melee touch attack, so if you're a 12th-level wizard for instance with 2 attacks per round, you could make 2 touches with a full-attack action. When you cast a touch spell you can make 1 touch with it as part of the same action, though you could 5-foot-step first (dunno if you can make a move-action between casting and touching though). On rounds following the casting, your hand retains the charge until you use up the alloted number of touches, OR UNTIL YOU CAST ANOTHER SPELL. This is in the Magic chapter of the Player's Handbook and the System Reference Document. Your hand loses the charge of a touch spell once you cast another spell.
Your best bet is to cast Haste on yourself first, so you get an extra attack each round. If your PC is a 13th-level character, you probably have enough BAB for 2 attacks per full-attack action, so with Haste you could get in 3 touches per round as long as you move no more than a 5-foot-step each round; that'll use up your 13 touch attacks within 5 rounds. Round 1, cast Haste and a Quickened Spectral Hand (the spell from the PH that creates a ghostly hand, which flies about and delivers touch attacks for you from a distance, but only touch spells of 4th-level or lower, though at +2 on the attack roll), then on round 2 you cast your touch spell and use Haste/Spectral Hand to deliver one attack, while moving somewhere behind partial cover probably, then on rounds 3 through 6 you direct the Spectral Hand to deliver 3 touches per round. However, I'm not familiar with the Spectral Touch spell or whatever from Libra Mortis/Libris Mortis/bad-Latin-book-o'-undead, so I don't know if it's low-enough level to be used with Spectral Hand from the Player's Handbook. If not, then you just remove Spectral Hand from the equation, start off by casting Haste and then moving close to an enemy, and on round 2 cast Spectral Touch, take a 5-foot-step up to your foe, and attack once with Haste, then move on to full-attacks plus Haste for 3 touches per round in melee.