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Method for preparing biodiesel from tea oil cakes

A technology for biodiesel and tea oil cake, which is applied in the fields of biofuels, separation methods, fat oil/fat refining, etc., can solve the problems of reducing the efficiency and yield of biodiesel preparation, increasing the viscosity of the reaction system, reducing the catalytic effect, etc., so as to improve the utilization rate. Value, reduce usage, improve catalytic effect

Pending Publication Date: 2021-11-16
HUNAN XINJINHAO TEA OIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned biodiesel preparation method, catalyst and methanol are directly added to the raw material for transesterification, and then the steps of separation and acid reduction are carried out. , the raw material will contain water and free fatty acid. During the transesterification reaction, the water in the raw material will cause the oil to be hydrolyzed to generate fatty acid and glycerol. Fatty soap not only consumes most of the catalyst and reduces the catalytic effect, but also increases the viscosity of the reaction system, which is not conducive to the separation of glycerin, thereby reducing the production efficiency and yield of biodiesel

Method used

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  • Method for preparing biodiesel from tea oil cakes
  • Method for preparing biodiesel from tea oil cakes
  • Method for preparing biodiesel from tea oil cakes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing biodiesel from tea oil cake, comprising the following steps:

[0042] 1) Oil extraction: a) Use a high-speed pulverizer to pulverize the tea oil cake into small particles and pass through a 60-mesh sieve; after sieving, dry it at a temperature of 75°C until it reaches a constant weight for use; b) Use a Soxhlet pump The extraction method is to extract the camellia oil in the tea seed cake with petroleum ether, the extraction conditions are: the temperature is 70°C, the extraction time is 8h, after the extraction is completed, the tea oil is collected and set aside;

[0043] 2) Concentration: the obtained camellia oil is concentrated using a rotary evaporator, and after the petroleum ether is completely separated, the crude camellia oil is collected for use;

[0044] 3) Extraction method for acid reduction: put the obtained camellia oil into a conical flask, at room temperature, add anhydrous methanol for extraction according to the solvent volume / te...

Embodiment 2

[0054] A method for preparing biodiesel from tea oil cake, comprising the following steps:

[0055] 1) Oil extraction: a) Use a high-speed pulverizer to pulverize the tea oil cake into small particles and pass through a 60-mesh sieve; after sieving, dry it at a temperature of 75°C until it reaches a constant weight for use; b) Use a Soxhlet pump The extraction method is to extract the camellia oil in the tea seed cake with petroleum ether, the extraction conditions are: the temperature is 70°C, the extraction time is 8h, after the extraction is completed, the tea oil is collected and set aside;

[0056] 2) Concentration: the obtained camellia oil is concentrated using a rotary evaporator, and after the petroleum ether is completely separated, the crude camellia oil is collected for use;

[0057] 3) Extraction method for acid reduction: put the obtained camellia oil into a conical flask, at room temperature, add anhydrous methanol for extraction according to the solvent volume / ...

experiment example 1

[0063] Experimental example 1 Optimization experiment of KOH catalyst dosage

[0064] This experimental example 1 adopts the method for preparing biodiesel in Example 1. In step 5) transesterification reaction, the reaction temperature is 70°C, the reaction time is 90min, and the mass ratio of dried anhydrous methanol to deacidified tea oil is Under the condition of 6:1, KOH was used as the catalyst to study the effect of different KOH catalyst additions on the yield of biodiesel. The experimental results are as follows: figure 2 shown.

[0065] from figure 2 The results showed that: when the KOH concentration was 0.2%-0.6%, the yield of biodiesel showed an upward trend, and after the concentration of 0.6%, the yield of biodiesel showed a downward trend. It can be seen that in the process of transesterification, KOH firstly reacts with free fatty acids, resulting in partial inactivity of the catalytic reaction, resulting in a low yield of biodiesel; with the increase of th...

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Abstract

The invention discloses a method for preparing biodiesel from tea oil cakes. The method comprises the following steps: 1) extracting grease; 2) concentrating to obtain crude tea oil; 3) deacidifying by an extraction method, and recovering the organic solvent to obtain deacidified tea oil; 4) carrying out adsorption dehydration on the deacidified tea oil and an organic solvent by adopting a silica gel drying agent to obtain dried deacidified tea oil; 5) ester exchange reaction; 6) separating liquid to obtain a coarse product; 7) washing and drying to obtain a biodiesel crude product; and 8) carrying out molecular distillation to obtain the biodiesel. In the process of preparing the biodiesel from the tea oil cakes, the free fatty acid in the crude tea oil is extracted by adopting the organic solvent, and then the deacidified tea oil is subjected to the transesterification after being subjected to the adsorption dehydration, so that the increase of the content of the free fatty acid caused by the hydrolysis of the raw material grease is avoided, the saponification reaction of the catalyst and the free fatty acid is effectively prevented, the catalytic effect of the catalyst is improved, the preparation time of the biodiesel is shortened, and the preparation efficiency and the yield of the biodiesel are improved.

Description

technical field [0001] The invention relates to the technical field of biodiesel preparation, in particular to a method for preparing biodiesel from tea oil cake. Background technique [0002] Camellia oil, also known as tea seed oil and camellia oil, is obtained from the seeds of Camellia oleifera, and is a unique woody oil in my country. Camellia oleifera in my country is rich in resources, and the area of ​​camellia oleifera forest accounts for more than 80% of the area of ​​woody edible oil plants. It is widely distributed in the hilly areas of 17 southern provinces, especially in Guangxi, Hunan, Jiangxi, and Yunnan. [0003] Camellia oil contains a large amount of unsaturated fatty acids and has a low freezing point, which is very beneficial for conversion into biodiesel. The tea oil cake after pressing generally contains 7%-10% residues, and these residual oils are usually extracted by solvent extraction, and edible oils with solvent residues pose a safety hazard to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B13/00C11B3/00C11B3/12C11B3/10C11C3/10B01D17/032B01D3/08B01D3/12C10L1/02
CPCC11B13/00C11B3/001C11B3/12C11B3/10C11C3/10B01D17/0214B01D3/08B01D3/12C10L1/02Y02W30/74Y02E50/10
Inventor 张涛唐艳萍陈勇李艳
Owner HUNAN XINJINHAO TEA OIL
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