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Method for increasing synthesis reaction efficiency of biodiesel

A synthesis reaction and biodiesel technology, which is applied in the fields of biofuel, petroleum industry, fatty acid production, etc., can solve the problems of low production efficiency, high energy consumption, and many processing procedures, achieve low cost, low energy consumption, and improve reaction efficiency Effect

Active Publication Date: 2013-08-28
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of low production efficiency, large energy consumption, and many processing procedures caused by the low alcohol vapor escaping from the liquid phase in the current biodiesel production process, thereby providing a A kind of method that can improve biodiesel synthesis reaction efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 500g soybean oil (acid value 21.4mgKOH / g), 210g methanol, 20g concentrated sulfuric acid to the reactor, start stirring and heat to 62°C, the mixture is pumped to the nozzle on the top of the reactor, sprayed by the nozzle and then falls back to In the reaction kettle, the reaction was continued for 6 hours, and the acid value of oleic acid was reduced to 1.8 mgKOH / g by sampling and detection, and the reaction conversion rate was 91.6%. After the reaction was finished, let it stand for half an hour to collect the upper liquid, then vacuum distilled the upper liquid to recover low-carbon alcohol, washed it with hot water until the water was clear, took the upper oil phase and obtained 460.8g of refined biodiesel product through vacuum distillation, and the total reaction yield was 92.2%.

Embodiment 2

[0017] Add 300g of waste oil (acid value 123.1mgKOH / g), 300g of ethanol, 10g of concentrated sulfuric acid into the reaction kettle, start stirring and heat to 60°C, pump it to the nozzle on the top of the reaction kettle, spray it through the nozzle and then fall back to the reactor In the kettle, the reaction was continued for 2 hours, and the acid value of oleic acid was reduced to 2.2 mgKOH / g by sampling, and the yield of esterification was 98.2%. After the reaction was finished, let it stand for half an hour to collect the upper liquid, then vacuum distilled the upper liquid to recover low-carbon alcohol, washed it with hot water until the water was clear, took the upper oil phase and obtained 288.8g of refined biodiesel product through vacuum distillation, and the total yield of the reaction was 96.3%.

Embodiment 3

[0019] Add 300g of waste oil (acid value: 123.1mgKOH / g), 350g of low-carbon alcohol, 15g of concentrated sulfuric acid into the reaction kettle, start stirring and heat to 55°C, and pump it to the nozzle on the top of the reaction kettle, and fall back after being sprayed by the nozzle In the reaction kettle, the reaction continued for 2.5 hours, and the oleic acid value was reduced to 3.3 mgKOH / g by sampling and detection, and the esterification yield was 97.3%. After the reaction, let it stand for half an hour, collect the upper liquid, and reclaim the low-carbon alcohol through vacuum distillation on the upper liquid, wash with hot water until the water is clear, take the upper oil phase and obtain 284.3g of refined biodiesel product through vacuum distillation, and the total yield of the reaction is 94.8%.

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PUM

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Abstract

The invention discloses a method for increasing the synthesis reaction efficiency of biodiesel. The method comprises the following steps of: (1) feeding: adding low-carbon alcohol and raw material grease which are in the mole ratio of (5: 1) to (30: 1) into a reaction kettle, and then adding an acidic catalyst which is 0.5-5% the weight of the grease into the reaction kettle while stirring; (2) heating: heating mixed liquid of the grease, the acidic catalyst and the low-carbon alcohol to the temperature of 50-62 DEG C; (3) circulating: starting up a circulating pump, pumping the mixed liquid at the bottom of the reaction kettle to the top of the reaction kettle, enabling the mixed liquid to be sprayed by a spraying device and then fall into the reaction kettle, and carrying out cyclic reaction for 2-6 hours until a sample passing a test; and (4) separating: after the cyclic reaction is completed, carrying out standing stratification, wherein an upper layer serves as a crude biodiesel product. The method has the advantages that the liquid phase reaction and the vapor-liquid mixed phase reaction are realized simultaneously, the reaction conditions are mild, the reaction time is short, and the reaction efficiency is high, so that the large-scale industrial production is facilitated.

Description

technical field [0001] The invention belongs to the technical category of biodiesel production in the field of new energy, and in particular relates to a method for improving the synthesis reaction efficiency of biodiesel. Background technique [0002] Biodiesel refers to fatty acid methyl ester or ethyl ester synthesized by esterification or transesterification of animal and vegetable oils, catering waste oil, industrial waste oil, gutter oil, acidified oil and other oils and low-carbon alcohols such as methanol or ethanol. , is a renewable diesel fuel that can replace petrochemical diesel fuel, and has the characteristics of renewable, low pollution, easy to degrade, and complete combustion. The synthesis reaction of biodiesel generally requires heating, especially the synthesis reaction using oil with high acid value as raw material, which is even more inseparable from heating. However, under heating reaction conditions, lower alcohols such as methanol or ethanol in the...

Claims

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Application Information

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IPC IPC(8): C11C3/00C10L1/02
CPCY02E50/10
Inventor 吴苏喜谭传波刘瑞兴宋斌闫帅航李慧宋艳秋黄闪闪
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY