Biodiesel oil preparing process and apparatus

Abstract

The present invention relates to biodiesel oil preparing process and apparatus. In the heated esterification reaction of methanol, concentrated sulfuric acid and material oil inside a stirring reactor, the methanol is first heated and gasified into methanol vapor before entering the reactor from the bottom, and this results in liquid phase-gas phase reaction with high reaction speed and short reaction period. Therefore, the present invention has the features of fast reaction speed, short reaction period, saving in material, lowered heat energy consumption and other advantages, and is suitable for preparing biodiesel oil with different kinds of material oil.

Description

Technical field [0001] The invention relates to a biodiesel preparation process and its device, in particular to a methanol vapor phase system and reflux process and its device in the esterification reaction of a biodiesel preparation process, and a methyl ester vapor phase continuous distillation process and its device. Background technique [0002] At present, biodiesel is mainly produced by chemical methods, that is, animal and vegetable oils and methanol are transesterified under acid-base catalyst and high temperature to generate corresponding fatty acid methyl esters, which are then washed and dried to obtain biodiesel. The conventional production process of acid-catalyzed esterification reaction is raw material pretreatment, removing impurities and dehydration in the raw oil, esterification reaction, separation, distillation, alcohol recovery and purification treatment, and its esterification reaction, adding methanol and Concentrated sulfuric acid and raw oil are heated t...

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Problems solved by technology

The weak point of its existence of above-mentioned two kinds of processing methods is, the first, above-mentioned two kinds of production methods are independent equipment design is various, general acid-catalyzed esterification reaction is applicable to acidified oil, quality-saving oil, waste oil etc.; And Alkaline catalyzed transesterification requires relatively low acid value and high requirements for oil quality. Second, the conventional esterification process is a reaction between liquid phase and liquid phase. Oil is a liquid phase, and methanol is also a liquid phase. In the presence of a catalyst, molecular motion and mechanical stirring are used to promote the collision of oil molecules and methanol molecules. The power of molecular motion is limited, and the reaction speed depends on the limitations of mechanical properties and sealing, and the stirring motion in the cylindrical reactor When the molecular rotation appears relatively static, the contact between the reactant molecules is greatly reduced, the reaction speed is slow, the reaction time is long, and the energy consumption increases, and the raw material consumption is large; thirdly, the product water is removed by a step-by-step method in the conventional process. The reaction time is long; fourth, the distillation process consumes a lot of energy and consumes a lot of raw materials

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