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Method for catalytic synthesis of biodiesel by using solid acid catalyst

A solid acid catalyst, biodiesel technology, applied in the direction of biofuel, fatty acid esterification, fat production, etc., can solve the problems of increased biodiesel cost, emulsification, high energy consumption, etc., and achieve good economic and environmental benefits, material consumption and The effect of reduced energy consumption and low product coloration

Pending Publication Date: 2021-04-09
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Waste oil contains more free fatty acids, and liquid bases such as potassium hydroxide are used as catalysts (references: Liu Jing, Fang Liguo. Preparation of biodiesel from camellia oil leftovers[J]. New Chemical Materials, 2015, 43(11): 108-110.), there will be a large amount of soap and water formed in the production process, which will easily form emulsification, reduce the activity of the catalyst, and make it difficult to separate methyl ester, glycerin and water, complicate the follow-up treatment, and make the production biological Increased cost of diesel
Using concentrated sulfuric acid as a catalyst, oleic acid as a raw material reactant, and methanol esterification to prepare biodiesel (references: Wang Tianren, Cui Guomin, et al. Research on one-step preparation of biodiesel from high acid value oil[J]. Solar Energy Sinica, 2019 , 40 (3): 838-842.), the above-mentioned method has problems such as serious equipment corrosion, unrecyclable catalyst causing environmental pollution, high alcohol-oil molar ratio (7:1), and large energy consumption

Method used

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  • Method for catalytic synthesis of biodiesel by using solid acid catalyst

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Experimental program
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Effect test

Embodiment 1

[0016] Weigh 50.0g of catering waste oil, centrifuge it to remove impurities mechanically, remove the moisture of catering waste oil, and obtain the pretreated catering waste oil. After pretreatment, the mass ratio of catering waste oil, methanol and p-aminobenzenesulfonic acid is 100:45:0.10. At 60°C, stir and react for 60 minutes, then let it stand for 1 hour, separate layers, take the upper liquid, and recover methanol through evaporation to obtain Biodiesel: The lower layer liquid is evaporated to recover methanol and glycerin at the same time, and the yield of biodiesel reaches 92.5%.

Embodiment 2

[0018] Weigh 50.0g of catering waste oil, centrifuge it to remove impurities mechanically, remove the moisture of catering waste oil, and obtain the pretreated catering waste oil. After pretreatment, the mass ratio of catering waste oil, methanol and ligninsulfonic acid is 100:45:0.40. At 60°C, stir and react for 60 minutes, then let it stand for 1 hour, separate layers, take the upper liquid, recover methanol through evaporation, and obtain biological Diesel oil; take the lower layer of liquid and evaporate to remove methanol and recover, and recover glycerin at the same time, the yield of biodiesel reaches 96.9%.

Embodiment 3

[0020] Weigh 50.0g of catering waste oil, centrifuge it to remove impurities mechanically, remove the moisture of catering waste oil, and obtain the pretreated catering waste oil. After pretreatment, the mass ratio of catering waste oil, methanol and 4-bromobenzenesulfonic acid is 100:45:0.27. At 60°C, stir and react for 60 minutes, then let it stand for 1 hour, separate layers, take the upper liquid, and recover methanol by evaporation. Biodiesel is obtained; the lower layer liquid is evaporated to recover methanol and glycerol at the same time, and the yield of biodiesel reaches 94.4%.

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Abstract

The invention relates to a method for catalytic synthesis of biodiesel by using a solid acid catalyst. The method comprises the following steps: carrying out mechanical impurity removal and dehydration pretreatment on the restaurant waste oil used as the raw material, adding methanol to carry out transesterification by using a sulfonic acid type solid acid as a catalyst, and carrying out settling separation and refining on the product to obtain the biodiesel. In the process, corrosive liquid acid such as concentrated sulfuric acid in the traditional process is prevented from being used as a catalyst. The sulfonic acid type solid acid catalyst used for catalyzing restaurant waste oil to synthesize biodiesel has the advantages of small corrosivity, recyclability, high catalytic efficiency, great shortening of the reaction time, improvement of the product yield, reduction of the alcohol-oil ratio in the transesterification process, resource saving and low energy consumption.

Description

technical field [0001] The invention relates to a method for producing biodiesel by using solid acid as a catalyst and catering waste oil and methanol as raw materials. Background technique [0002] The sources of waste oils and fats produced by catering and oil processing industries are very sufficient, with a total amount of more than 10 million tons per year. Now our country consumes more than 30 million tons of vegetable oil every year, which directly produces a large amount of waste oil. The development of catering industry in large and medium-sized cities also produces 3 million tons of catering waste oil. It is of great value to use catering waste oil to produce biodiesel. [0003] Waste oil contains more free fatty acids, and liquid bases such as potassium hydroxide are used as catalysts (references: Liu Jing, Fang Liguo. Preparation of biodiesel from camellia oil leftovers[J]. New Chemical Materials, 2015, 43(11): 108-110.), there will be a large amount of soap a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/10C11B3/16C11B3/00C10L1/02
CPCC11C3/10C11B3/001C11B3/16C10L1/02Y02E50/10
Inventor 程正载孙欣贾如艳熊景陈俊袁贝贝马里奥高斯尔
Owner WUHAN UNIV OF SCI & TECH
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