Supersonic reaction procedure of Bio-diesel extraction technique

Abstract

This invention discloses a method for refining biodisel oil by ultrasonic wave. The method has such advantages as shortened refining time, reduced energy consumption, increased productivity, lowered cost and reduced danger. The obtained biodiesel oil can be directly used, and has such advantages as little pollution and high hexadecane value.

Description

technical field [0001] The invention is a refining technology that can effectively shorten the reaction time of mass production of biodiesel, increase production capacity and react under normal temperature and pressure. The refined biodiesel can be widely used in various diesel engines, engines, combustion Power equipment such as appliances and boilers. Background technique [0002] The most commonly used method of biodiesel refining is transesterification technology, which can be subdivided into strong alkali, strong acid, enzyme and reaction under high pressure and high temperature environment according to the catalyst added. The supercritical methanol process; currently 60% of the world's production capacity, such as Europe, the United States, Japan and other countries mostly use strong alkali process, which has the advantages of simple process, low cost and fast response, so it is widely used in mass production, the only difference is The raw material oil used varies de...

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Problems solved by technology

[0007] Although the enzyme production process has the above-mentioned characteristics, it is not easy to cultivate the enzyme and it needs to maintain its activity under specific environment and conditions, so the process steps become quite cumbersome during the transesterification reaction, for example, the reaction temperature needs to be fixed at 35 ℃, too high or too low ambient temperature will affect the activity of the enzyme. In addition, it is necessary to continuously add acetate during the process to maintain the pH value of the reaction environment. Depending on the increase in the reaction rate, it is necessary to add appropriate alcohol content and Maintain a vibration frequency of 150 times per minute to react. All kinds of harsh conditions will make the mass production process relatively complicated. What is more worrying is that depending on the use of enzymes and methods, the reaction time is about 6.3 ~72 hours. Compared with the advantages of basic catalysts such as simplicity, speed, and high conversion rate, this is also the main reason why the enzyme process is not widely used in mass production plants of biodiesel.

[0008] The supercritical methanol process can quickly carry out the transesterification reaction without adding any catalyst. According to the literature, a batch cycle can produce about 5ml of biodiesel in 3 minutes, because the supercritical process does not Need to add any catalyst, so the reaction needs to add a large amount of alcohols, the mixing ratio of oil and alcohols is 1:42 mole, the amount of such alcohols is 6 times that of the strong alkali process and 1.41 times that of the strong acid process In addition, in order to quickly complete the transesterification reaction, the reaction needs to be completed under a high pressure and high temperature environment of 45~65MPa and above 350°C. This will increase the risk of the process and greatly increase the reaction cost. In addition, the current supercritical methanol process is limited by the high-pressure and high-temperature reaction vessel, so it cannot be used for mass production. It can only be used for micro-production and characteristic analysis in the laboratory. This is an urgent problem that needs to be overcome when the process is to be mass-produced in the future

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