Device and method for continuously preparing biodiesel

Abstract

The invention relates to a device and method for continuously preparing biodiesel with foamed metal filling reactor. The invention includes firstly injecting lipid and low carbon alcoholic solution with dissolved basic catalyst into a passive mixer 4 according to a setting ratio continuously and respectively, forming a chaotic stream intensified mixture inside, emulsifying and dispersing; and then continuously injecting the emulsified mixture into a reactor 5 for filling foamed metal 6, furthermore intensifying and mixing, and guaranteeing the reaction temperature through a heating mechanism 7 outside the reactor; at last, obtaining biodiesel through separation and purification from the reaction product. The apparatus and method for preparing biodiesel according to the invention have the advantages of simple technique, low energy consumption, high efficiency, continuous operation, mass production convenience or the like.

Description

technical field [0001] The invention relates to a device and a method for continuously preparing biodiesel, in particular to a device and a method for synthesizing biodiesel in a reactor filled with foam metal, and belongs to the technical field of biodiesel preparation. Background technique [0002] Biodiesel is made of animal and vegetable oils and fats. Compared with conventional diesel oil, it has excellent environmental protection characteristics, good low-temperature engine starting performance, lubricating performance, safety performance and renewable characteristics, and is favored by people. As an alternative The clean liquid biofuel of petrochemical diesel has great potential and broad market prospect. [0003] The transesterification method is currently the main method for the industrial production of biodiesel. It uses methanol, ethanol and other alcohols to replace glycerin in triglycerides in vegetable oil under the catalytic action to form long-chain fatty ac...

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Problems solved by technology

CN1919973A proposes to use a loop turbulent flow reactor to form a set of continuous biodiesel preparation device, the reaction temperature is 150-230°C, the pressure is 1-7MPa, the residence time is 5-30min, and the conversion rate of biodiesel can reach more than 99%. But its temperature and pressure are high

CN100999679A proposes to add a cosolvent to promote the two-phase mixing of alcohol and oil, and the mixed solution continuously enters the pipeline reactor for transesterification reaction. The reaction temperature is 60-65°C, the alcohol-oil ratio is 10-27, and the reaction time is 30-120min. Biodiesel The yield is 97.0-99.9%, but its alcohol-oil ratio is high, the reaction time is long, and the introduction of co-solvent will bring inconvenience to subsequent processing and increase the cost of raw materials

CN1810930A is based on the traditional biodiesel production technology, adding an emulsifying mixer (0.2-1.0MPa), so that the incompatible methanol and oil are mixed and dispersed into 1-10 micron droplets, which greatly increases the contact surface area of ​​the two-phase reaction. After being heated by a heat exchanger, it enters the bubbling reaction tower, depressurizes, and methanol gasifies to form a large number of fine bubbles, which increases the contact interface, thereby speeding up the transesterification reaction rate, but before entering the emulsification mixer, it needs to pass a booster pump, and the production conditions are relatively low complex

CN101148409A utilizes microchannel reactor, under normal pressure and the reaction temperature of 90-170 ℃, control reaction material to stay in microchannel reactor for 5-60min, can prepare biodiesel, and productive rate is higher, but microreactor output is too small

However, this method requires pre-mixing, and the reaction efficiency is low

CN101333451A discloses a biodiesel micro-reaction system integrating a micro-heat exchanger, a micro-mixer and a micro-reactor. At 70 ° C, 1 min, the yield of soybean oil methyl ester is 95.5%, but it needs preheating, the system More complex, biodiesel output is less than 10mL min -1

But even for small-scale biodiesel production scale (10,000 tons / year), at least 2200 microreactors need to be connected in parallel, which is very difficult

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