Method for preparing biodiesel

A biodiesel and oil technology, applied in biofuel, bio-raw material, petroleum industry, etc., can solve the problems of high price, low efficiency and long reaction time of enzymes, so as to save the pretreatment process, simple process flow, and raw materials adaptable effect

Active Publication Date: 2013-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the acid catalysis is that the reaction speed is slow, a large amount of waste acid will be produced, and the environment will be polluted.
The shortcomings of using enzyme catalysts are: long reaction time, low efficiency, expensive enzymes, and easy inactivation in high-purity methanol
[0007] CN1141993C discloses the method for preparing fatty acid ester with grease and alcohol under the condition that one of grease and alcohol is in supercritical state and in the presence of no catalyst, the method adopts batch reaction, which is unfavorable for large-scale industrial production
[0009] From the above prior art, it can be found that the production of biodiesel by medium and high pressure methods has the problems of low biodiesel yield, or the use of batch reaction, which is not conducive to large-scale industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Mix the crude soybean oil containing 1.2wt% of unsaponifiable matter and 36wt% of free fatty acid with the rapeseed oil of Comparative Example 2 at a weight ratio of 0.3:1, and the oil hourly space velocity is 1.2h -1 , The rate of alcohol-oil molar ratio is 7 is continuously supplied to the tubular reactor. The temperature in the reactor is 272°C and the pressure is 8MPa. After the crude reaction product is separated from methanol and glycerin, biodiesel and biodiesel Yield 92.2wt%, acid value 3.5mgKOH / g. The residual liquid at the bottom of the still can be used as a raw material to be circulated to the feed port of the reactor for secondary reaction. Almost all of the constituents of the feedstock that could become fatty acid methyl esters are converted to the desired product.

[0036] Under the same conditions, using the above-mentioned crude soybean oil with a free fatty acid content of 36wt% as raw material, the biodiesel yield was 87.2wt%, and the acid value was...

Embodiment 2

[0038] Mix cottonseed oil containing 1.5wt% unsaponifiable matter and 26wt% free fatty acid content with refined soybean oil in Comparative Example 1 at a weight ratio of 1:1, and the oil hourly space velocity is 1.2h -1 , the rate of alcohol-oil molar ratio is 5 to provide into the tubular reactor, the temperature in the reactor is 272°C, the pressure is 8.5MPa, after the crude reaction product is separated from methanol and glycerol, the biodiesel is distilled by vacuum rectification, and the yield of biodiesel is 91wt%, biodiesel purity 99.3wt%, acid value 3.3mgKOH / g, free glycerin content 0.2wt%. Add 40°C, 5% sodium carbonate solution to the ester phase for washing. After washing, the mixture enters the fiber bundle separator. -1 , separate the ester phase and the water phase, the acid value of the ester phase is 0.27mgKOH / g, and the free glycerin content is 0.018wt%. The residual liquid at the bottom of the still can be used as a raw material to be circulated to the feed...

Embodiment 3

[0041] Mix waste oil with a free fatty acid content of 14.3wt% with soybean oil and rapeseed oil at a weight ratio of 1:1:1, and the oil hourly space velocity is 1.2h -1 , the rate of alcohol-oil molar ratio 5 is continuously provided in the tubular reactor, at 320 ℃ of reactor temperature, under the condition of pressure 9MPa, fatty acid methyl ester is made, and the crude product that flows out of reactor enters flash tower, in -1 , separate the ester phase, and the ester phase enters the vacuum rectification tower. Under the conditions of vacuum degree 8mmHg, tower kettle 280°C and no reflux, biodiesel is obtained at the top of the tower, with a purity of 99.1wt%, and a biodiesel yield of 83.9wt%. When the acid value is less than 2.0mgKOH / g, the residual liquid enters the molecular rectification device. At a residual pressure of 5-6Pa and a heating surface of 190°C, a light fraction with a high monoglyceride content is obtained, and the remaining high-boiling point material i...

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Abstract

The invention relates to a method for preparing biodiesel, which comprises the following steps: a raw oil material reacts with C1-C6 monohydric alcohol in a reactor under the existence of an extra non-esterified fatty acid source; and the biodiesel is obtained by separating fatty acid ester from reacted materials, wherein the content of non-esterified fatty acid in the non-esterified fatty acid source is 2-100 wt percent and higher than that of the non-esterified fatty acid in the raw oil material. The method can improve the yield and purity of biodiesel of raw oil material low in reaction activity, and the raw material has strong suitability.

Description

[0001] This application is a divisional application of 200610165101.x. technical field [0002] The invention relates to a method for preparing biodiesel by reacting oil and monoalcohol. Background technique [0003] The main component of biodiesel is fatty acid ester, which can be obtained by transesterification reaction between oil and monohydric alcohol. In addition to fatty acid ester, the product of transesterification reaction may also contain monoglyceride, diglyceride, and glycerol by-products. And unreacted alcohol and oil raw materials. In the prior art, the preparation methods of biodiesel can be divided into acid catalysis, base catalysis, enzyme catalysis and supercritical method. [0004] CN1473907A uses vegetable oil refining leftovers and edible recovered oil as raw materials. The catalyst is compounded by sulfuric acid, hydrochloric acid, p-toluenesulfonic acid, dodecylbenzenesulfonic acid, naphthalenesulfonic acid and other inorganic and organic acids. Aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/02C11C3/04
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 王海京杜泽学闵恩泽高国强
Owner CHINA PETROLEUM & CHEM CORP
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