https://blendermarket.com/products/postshade-dissolve-fx

PostShade-DissolveFX  is a real-time solution to make anything you need to dissolve in a Sci-Fi/ Fantasy fashion. Easy and quick to set up, find your best visual style using exposed parameters, append the Group at the end of your already existing shader and animate the evaluation time to achieve your results.  The Dissolve FX is a Shader group that comes very handy when you need to make something disappear fancy in animation or even if you just want a Sci Fi touch to your still renders.