Method for preparing biodiesel

• Main Authors: JEON, EU-GENE, YUN, JUN-U, HA, TAE-HO, LEE, SEUNG-DON, PARK, HYEOK, LEE, KANG-HOON, KWAK, JIN-SIK, KIM, GYUNG-SOO, KO, JUNG-HWAN
• Format: Patent
• Language: Chinese; English
• Published: 16.10.2014
• Subjects: ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; CHEMISTRY; CRACKING HYDROCARBON OILS; FIRELIGHTERS; FUELS; FUELS NOT OTHERWISE PROVIDED FOR; LIQUEFIED PETROLEUM GAS; LUBRICANTS; METALLURGY; MINERAL WAXES; NATURAL GAS; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K; TECHNICAL GASES CONTAINING CARBON MONOXIDE

Disclosed herein is a method of preparing biodiesel, including the steps of: removing foreign materials from biodiesel raw oil containing lower fatty acid and having an acid value of 20 mgKOH/g or less with an adsorbent; dewatering the foreign materials removed biodiesel raw oil; passing the dewatered biodiesel raw oil through a solid acid catalyst reaction guard bed provided with a cation exchange resin for removing metal cations at 20 to 80 DEG C at a flow rate of 6 vol% (6 SV) or less, mixing methanol with the passed biodiesel raw oil, and then passing the mixture through a solid acid catalyst reaction main bed provided with a solid acid catalyst for an esterification reaction at 70 to 120 DEG C at a flow rate of 0.5 to 1.5 SV to adjust a final acid value of the biodiesel raw oil to 5 mgKOH/g or less; and reacting the biodiesel raw oil having the final acid value of 5 mgKOH/g or less in the presence of an alkali catalyst.