Abstract: The invention relates to a process for the complex processing and preservation of alimentary plants, mainly seasonal alimentary plants. The process according to the invention comprises--depending on the type of the plant--purifying and, if desired, crushing the plant, digesting it, adjusting it to other alcohol content of 15 to 45% by volume by adding ethanol before or after separation of the solid part, letting it stand for at least 3 weeks, then separating the solid and liquid phases, storing the liquid phase for an optional time, if desired absorbing carbon dioxide or in inert gas in the material to be fed in, then after pre-heating the liquid to a temperature between 50.degree. and 100.degree. C., distilling the alcohol from it by flash distillation under a pressure of 6.4-26.6 kPa, at a temperature of 40.degree. to 80.degree. C.

Abstract: The invention relates to a packer for separation of zones behind casing in a well bore. It comprises a casing string serving as mandrel for the packer, an expandable packing element and first and second sleeves tightly fixed to the peripheries of the packing element, wherein the first sleeve is sealed and movable in respect of the casing string and the second sleeve is tightly fixed to the casing string.According to the improvement in this invention, a sleeve plug slides on and is sealed against the casing string and has a thicker upper part and a thinner lower part, the upper part is slidingly arranged at least partially between the casing and the collar and is sealed against both of them, the lower part is slidingly arranged at least partially between the casing and the packing element. The first sleeve slides tightly on the sleeve plug. A non-return valve in the casing connects the inside and the outside of the casing at the packing element.