43results about How to "No waste of raw materials" patented technology

The invention discloses a preparation technology of biodiesel produced from refined grease. The preparation technology comprises the following steps: 1) selecting and using qualified raw grease, methanol and a catalyst; 2) dissolving the catalyst in the methanol in an appropriate proportion; 3) performing an ester interchange reaction of a prepared catalyst methanol solution and the grease under appropriate conditions; 4) performing first-time water washing and liquid separation to remove the catalyst and glycerin which is produced by the ester interchange, and rectifying and recycling the superfluous methanol; 5) performing secondary water washing and dehydration to produce a non-standard product A; 6) obtaining a non-standard product B and tower-bottom heavy oil through vacuum distillation of the non-standard product A; and 7) obtaining a biodiesel product in strict conformance with national standard GB / T 20828-2007 by deep deacidification, water washing and dehydration of the non-standard product B. The preparation technology has stable technological processes, and can fully realize recycling of the excess methanol, reuse of soft water and saving of energy and resources. The by-product crude glycerin has extremely few impurities and good quality, and can be excellently applied to a production line of the biodiesel produced from non refined grease, and no raw material may be wasted.