Recovery of solvents - Import export

De Smet Engineers & Contractors has been involved in all steps of the production of vegetable oils from oilseeds crushing for the construction of Edible Oils Plants; in this article you will find a more detailed understanding about the process of vegetable oil extraction: First step: Preparation of the oil containing material prior to solvent extraction Cleaning and Drying The plant feedstock must be cleaned so that foreign matters are removed. This applies particularly to sand/silicate and iron which may damage the preparation plant equipment. For some seeds or for some processes the incoming material moisture must be controlled and adjusted for better efficiency of subsequent operations. Mechanical preparation Most of raw materials needs to broken to reduce the particle size to ensure proper cooking and flaking. They are then heated in cooking / conditioning equipment and their moisture further controlled in addition to be softened before the next mechanical operations. After cooking, heated grits are flaked so that the oil cells are broken and the oil more readily available for further solvent extraction or mechanical pressing. Pressing Oilseeds containing above 20 to 25% (rapeseed, sunflower seeds, cottonseeds...) are generally pressed mechanically in order to extract most or part of the oil available in the feedstock. This operation is done through full pressing for maximum oil recovery leaving up to 5 to 10% in the final cake which is marketed as such or through a low pressure pre-pressing operation producing a cake with higher residual oil content which is then recovered in the solvent extraction plant. Dehulling Oil extraction plants produce a solid finished product in addition to the extracted oil; this product (cake or meal) is normally used as an important component for animal feed recipes. Depending on the meal destination, its protein content often needs to be increased and its fibre content minimized. Such characteristics are generally achieved through decortication or dehulling operations that separate the outer part of the feedstock before extracting the oil. Second step: Solvent extraction of the material suitably prepared Extraction In the solvent extractor, solids (Flakes from the flaking machines or cakes from the pre-presses) are conveyed through the equipment while a mixture of hexane and oil (miscella) is sprayed counter-current. The extractor produces therefore deoiled solids containing solvent and miscella. Desolventization Deoiled solids coming out of the extractor are conveyed to a dedicated equipment that completely removes the remaining solvent while preserving the meal quality: the desolventizer. This apparatus is usually combined with additional sections for drying and cooling the meal to the required storage and market parameters. Miscella distillation Solvent contained in the miscella is completely removed under vacuum and optimum temperature for preserving oil quality. The solvent from the distillation as well as the one removed at meal desolventization stage are then recycled to the extractor. Solvent recovery Since the air entering the process together with material fed to the extractor is laden with solvent when it is removed from the plant it first pass through a specially designed absorption column to limit emission to an acceptable level. Meal treatment The extracted meal is often subject for further treatment, including grinding to obtain the required granulometry or pelletizing to reduce its volume during transport.

100 - 3600 CFM / 170 to 6,100 m³/h The NASH SC vacuum pump and compressor, which replaced the popular NASH CL pump in the 1980's, is still being manufactured at Gardner Denver Nash. The SC pump, more flexible and simpler to install and easy to maintain, made it a very reliable pump to be used in many applications. SC pumps are found in applications including: autoclaves, chucking, container filling, labeling and forming, cooking, deaerating, deodorizing food and fats, drying, evaporating, eviscerating, exhausting, extruder venting, fiber setting, filtering, forming, gas stripping, laboratory central vacuum systems, medical and dental vacuum draining, molding, pickup and conveying, priming, slot extraction, and solvent recovery. All SC models are still available from Gardner Denver Nash, the original designer and manufacturer. Whether you have an existing SC pump running in your plant that is in need of service, repair, or replacement with a new or remanufactured duplicate SC pump, Gardner Denver Nash is there for all of the above.

170 - 14000 CFM / 240 to 23,700 m³/h The NASH CL Vacuum Pump and Compressor product line is perhaps the most popular ever built. There are 12 different models, from the CL-200 through the CL-14000, with capacities ranging from 150 CFM to over 14,000 CFM. They can be found in many applications including: autoclaves, carburetor testing, chucking, condenser exhausting, container filling, cooking, deaerating, drying, eviscerating, exhausting, extruder venting, fiber setting, filtering, forming, gas stripping, molding, pickup and conveying, priming, slot extraction, and solvent recovery. All CL models are still available from Gardner Denver Nash, the original designer and manufacturer. Whether you have an existing CL pump running in your plant that is in need of service, repair, or replacement with a new or remanufactured duplicate CL pump, Gardner Denver NASH is there for all of the above. Gardner Denver Nash continues to manufacture and offer the CL to our customers.