Can sodium acetate anhydrous be used as a desiccant?
No, not in most applications. While it may act as a dessicant, it is fairly volatile, so you'll get acetic acid evolving from it in the presence of water. Generally, you don't want to expose what ever you're keeping dry to acid. The two obvious issues when it comes to food uses (ie toxicity concerns) is smell (and taste) and acceleration of spoilage (although in the cases of acidic foods, it might not be an issue). You don't generally want your dessicant mixed into the product so keeping them separate is optimal but with the volatile acetic acid it could be a problem. If you wanted to use its acidity to enhance stability or taste (mixed into the food), then you'd have problems with changes in consistency as water was absorbed.