Method for continuous esterification of waste oil and fat

Abstract

The invention discloses a method for continuous esterification of waste oil and fat. Purified waste oil and fat mixes with a prepared catalyst after being heated; tertiary esterification is performed,each level of materials enters a tower from the side surface at the upper part of the reaction tower, methanol enters the tower from the side surface at the bottom of the reaction tower after heatinggasification, and a reaction temperature is kept at 110-130 DEG C; water generated by each stage of esterification is led out from the top of the reaction tower with excess methanol to enter a gas-liquid separation device, the separated waste oil and fat returns back to a primary reaction tower through liquid dropping, and the separated methanol water vapor enters a methanol distillation column to perform distillation and recycling; and a reacted esterification product enters a transition groove to perform standing after cooling, so that the catalyst can be separated to perform recycling, andthe esterification product enters a storage groove. The method has characteristics of being high in degree of automation, simple and efficient in operation, low in production cost and stable in product quality.

Description

technical field [0001] The invention relates to a method for producing biodiesel, in particular to a method for continuous esterification production of waste oil. Background technique [0002] Since waste oil is a mixture of free fatty acids, triglycerides and water impurities, currently in the process of using waste oil to produce biodiesel, waste oil is generally heated, precipitated, separated and other means to separate water, sediment and other impurities, and then The purified waste oil and fat are converted into fatty acid esters through esterification reaction, and then triglycerides are converted into fatty acid esters through transesterification reaction. The existing production methods mainly include batch method (reaction kettle), high temperature and high pressure supercritical method (reaction tower), high temperature method (reaction tower), biological enzyme method and the like. The waste oil, methanol and catalyst are added to the batch method (reaction ket...

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Problems solved by technology

Add waste oil, methanol, and catalyst to the batch method (reactor), and generate biodiesel after esterification and transesterification at a certain time and temperature. The disadvantages are long reaction time, high labor intensity, low efficiency, The level of automatic control is low; the defects of high temperature and high pressure supercritical method (reaction tower) are high equipment cost, high energy consumption and complicated operation; high temperature method (reaction tower) is relatively Although the equipment cost and energy consumption are low, the quality requirements for waste oil are high and the adaptability is poor; the biological enzymatic method uses enzymes as catalysts, which is environmentally friendly, but the enzymes are easily poisoned and inactivated, and the production cost is high. It is also difficult to promote the application

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