Abstract: The present invention provides a method for the purification of pravastatin comprising extracting a solution comprising pravastatin in a water-immiscible solvent with water at a pH value ranging from 5.0 to 7.0.

Abstract: The invention provides a simple and selective method for the deacylation of 4-acylated statins during the preparation of statins from a fermentation broth, more specifically a reduction of impurities from the process, by increasing the pH of the fermentation broth.

Abstract: The invention relates to a process for the combined treatment of waste materials of two types A and B, A being waste material having a relatively high energy content and B being a water containing waste material having a relatively low energy content, said process comprising the following steps: 1) pyrolyzing material A to produce a gas and/or oil and a carbonaceous residue, 2) mixing said carbonaceous residue with B to form a water containing mixture C, 3) shaping said mixture C into individual pieces, 4) drying and baking said pieces to ceramic bodies, wherein in step 2. the carbonaceous residue is used in such an amount that less than about 80% of the totally required baking energy is contained in mixture C.

Abstract: A hot water boiler, e.g. for central heating, has two castings which contain water passages and are connected together to enclose a combustion chamber and above it a flue. From the flue, the burned gases pass downwardly through passages outside the castings into which ribs on the castings project. In order to improve thermal efficiency by achieving considerable condensation of water vapor on the burned gases, the castings are located on a sump into which the downward passages for burned gas open and which has means for removing condensate collecting in it. A blower is provided to extract the burned gas from the sump.