COMPLETED MANUFACTURING PLANTS AND APPARATUS FOR THE CHEMICAL INDUSTRY-NAMELY, PLANTS FOR PRODUCING SOLID SYNTHETIC DETERGENTS; DRYING PLANTS; SULPHONATING AND SULPHATING PLANTS; PLANTS FOR PRODUCING DEODORIZED OILS; PLANTS FOR PRODUCING YEASTS; PLANTS FOR REFINING MINERAL OILS; PLANTS FOR PRODUCING WHITE OILS; PLANTS FOR FEEDING, DOSING AND MIXING PRODUCTS IN POWDER, LIQUED AND PASTE FORM; AND PLANTS FOR CONTROLLING AND MEASURING THE DENSITY OF PRODUCTS