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Method for preparing biological diesel oil by esterifying, ester interchanging greases in high acid number

A high acid value oil, biodiesel technology, applied in the preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems of high equipment requirements and industrialization difficulties, shorten the reaction time, reduce the reaction steps and reaction conditions. mild effect

Inactive Publication Date: 2008-12-03
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the supercritical methanol phase reaction is carried out under high temperature and high pressure conditions, which requires high equipment and is difficult to industrialize.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1), take 150 milliliters of rice bran oil and add it to the autoclave, the free fatty acid content of rice bran oil is 26.3wt%, add 5 grams of lead acetate catalyst, control the reaction temperature at 210 ° C, inject methanol through a high-pressure plunger pump until the system pressure is 2 MPa, at this time 100 ml of methanol was added, and the reaction time was 15 minutes;

[0019] (2) After the reaction, the product obtained in (1) is distilled to remove methanol, centrifuged or filtered to separate part of the catalyst, washed with water to remove residual glycerin and catalyst, and refined to obtain biodiesel.

Embodiment 2

[0021] (1), take 100 milliliters of swill oil and add it to the autoclave, the free fatty acid content of the swill oil is 42.5wt%, add 3 grams of zinc stearate catalyst, control the reaction temperature at 220°C, inject methanol through a high-pressure plunger pump until the system pressure is 4MPa 150 milliliters of methanol was added at this time, and the reaction time was 10 minutes;

[0022] (2) After the reaction, the product obtained in (1) is distilled to remove methanol, centrifuged or filtered to separate part of the catalyst, washed with water to remove residual glycerin and catalyst, and refined to obtain biodiesel.

Embodiment 3

[0024] (1) Take 120 milliliters of high acid value soapstock from the oil factory and add it to the autoclave. The free fatty acid content of the soapstock is 75.2wt%, add 2 grams of cadmium acetate catalyst, control the reaction temperature at 160 ° C, and inject methanol into the system through a high-pressure plunger pump The pressure is 7MPa, now add 130 milliliters of methanol, and the reaction time is 50 minutes;

[0025] (2), with embodiment 1.

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Abstract

A process for preparing biologic diesel oil from the fat with high acid number by esterifying and ester exchange includes such steps as proportionally loading said fat and methanol into high-pressure reactor, proportionally adding Lewis acid as catalyst, reation, distilling the resultant to separate methanol, centrifugal separation or filter to remove part of catalyst, water washing to remove residual glycerin and catalyst, and refining.

Description

technical field [0001] The invention belongs to a preparation method of biodiesel, in particular to a method for producing biodiesel through simultaneous esterification and transesterification of high-acid value grease and methanol by a subcritical methanol phase Lewis acid. Background technique [0002] Biodiesel refers to substances derived from biological products that can be used as fuel for diesel engines, including cracking products of animal and vegetable oils or fatty acid esters obtained by transesterification of animal and vegetable oils with short-chain alcohols. Biodiesel has the characteristics of renewable, complete combustion, low exhaust pollution, easy biodegradation, and harmless to human body. The research and application of biodiesel is of great significance for coping with the oil crisis, improving fuel safety, and transitioning fuel varieties after oil resources are exhausted. At present, the application of biodiesel is mainly based on fatty acid methy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 侯相林齐永琴乔欣刚
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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