Method for preparing biodiesel by utilizing stratified and graded esterified deacidification of high acid value oil

A high acid value oil and biodiesel technology, applied in the production of biological raw materials, biofuels, bulk chemicals, etc., can solve the problems of difficult dehydration in esterification reaction, low esterification rate, etc., and achieve light color and high conversion rate. , the effect of reducing emissions

Inactive Publication Date: 2009-06-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of difficult dehydration and low esterification rate in the esterification reaction and the shortcomings of the above-mentioned prior art, the present invention proposes a process and technology for deacidification by stratification and graded esterification, specifically the stratification and graded esterification of high acid value oils and fats Method for preparing biodiesel by deacidification

Method used

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  • Method for preparing biodiesel by utilizing stratified and graded esterified deacidification of high acid value oil
  • Method for preparing biodiesel by utilizing stratified and graded esterified deacidification of high acid value oil

Examples

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Effect test

Embodiment 1

[0030] Primary esterification and layering:

[0031] Add 1500 grams of tallow bark oil (acid value 30mgKOH / g oil) through filtration and dehydration into a jacketed storage tank, and preheat to 60°C, then add 75 grams of methanol solution that is dissolved with 7.5 grams of 98% concentrated sulfuric acid , transported into the hydraulic cavitation esterification reactor with a pump, reacted at 60°C for 20min, the reaction liquid entered the clarification tank, stayed in the clarification tank for 1 hour, and removed the methanol / water / catalyst phase by layering to obtain 1501 grams of the oil phase, according to The national standard GB / T5530-85 measures the acid value of the oil phase to be 13.68mgKOH / g oil, and the moisture content of the oil phase measured by the Karl Fischer moisture analyzer is 3.0ug / uL.

[0032] Secondary esterification and stratification:

[0033] Put 1501 grams of the oil phase obtained after primary esterification and layering into a storage tank wit...

Embodiment 2

[0039] Primary esterification and layering:

[0040] 1500 grams of tallow bark oil (acid value 30mgKOH / g oil) after filtering and dehydration add in the storage tank with jacket, and preheat to 60 ℃, then add 85 grams of methanol / catalyst layer (#1, embodiment 1 (obtained after the second stage esterification reaction in the medium), pumped into the hydraulic cavitation esterification reactor, reacted at 60°C for 20 minutes, the reaction liquid entered the clarification tank, stayed in the clarification tank for 1 hour, and removed methanol / water / For the catalyst phase, 1502 grams of the oil phase was obtained. The acid value of the oil phase was measured according to the national standard GB / T5530-85 to be 16.47 mgKOH / g oil, and the moisture content of the oil phase was measured by a Karl Fischer moisture analyzer to be 3.0 ug / ul. Secondary esterification and stratification:

[0041] 1502 grams of the oil phase obtained after primary esterification and layering are added in...

Embodiment 3

[0048] Primary esterification and layering:

[0049] Add 1500 grams of acidified oil (acid value 170 mgKOH / g oil, gum content about 10%) into a jacketed storage tank, and preheat to 60 ° C, then add 900 grams of methanol solution dissolved in 30 grams of concentrated sulfuric acid, and use a pump Transported into the hydraulic cavitation reactor, reacted at 60°C for 30min, the reaction solution was centrifuged at 3000rpm, and the methanol / water / catalyst layer was removed to obtain 1647g of the oil phase, and the oil phase acid was measured according to the national standard GB / T5530-85 The value is 50.1mgKOH / g oil, and the water content of the oil phase measured by the Karl Fischer moisture meter is 3.5ug / uL.

[0050] Secondary esterification and stratification:

[0051] Add 1647 grams of the oil phase after primary stratification and graded esterification into a jacketed storage tank, and preheat it to 60°C, then add 900 grams of methanol solution dissolved in 30 grams of co...

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Abstract

The invention provides a method utilizing high acid value oil as raw material for preparing biodiesel. Various animal and vegetable oil, the acid value of which is larger than 3.0mg KOH / g oil, oilstock, soapstock and acidic oil in a vegetable oil refining process, various food waste oil (restaurant waste oil, hogwash oil, trench waste oil, and the like) and various waste animal oil in industrial processing (waste animal oil in leather processing, waste animal oil in slaughtering process, and the like) are used as raw materials to obtain biodiesel products by filtration for removing solid impurities, vacuum dehydration, stratified graded acid catalytic esterification, alkali catalytic transesterification and vacuum distillation. The method utilizing the high acid value oil as the raw material for preparing the biodiesel has the beneficial effect that the production process can be applied to raw materials with different acid values to produce biodiesel products with high purity by changing the operational series of the stratified graded acid catalytic esterification reaction and has the advantages of simple process, low energy consumption, high conversion rate and small device. And continuous production can be realized.

Description

(1) Technical field [0001] The invention relates to a method for preparing biodiesel by using oil with high acid value as raw material for deacidification through layering and graded esterification. (2) Background technology [0002] The increasing shortage of fossil fuels and the impact of a large amount of waste from fossil fuels on the environment are two major problems in the current energy industry. Biodiesel is favored by countries all over the world because of its performance close to or even better than that of petrochemical diesel and its cleanliness and friendliness to the environment. Pay attention to. In the process of vigorously developing biodiesel, countries all over the world have found that the bottleneck restricting the development of biodiesel lies in the serious shortage of raw materials and the high price of raw materials. [0003] Countries around the world use different feedstocks to produce biodiesel. The United States mainly uses surplus soybean oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P20/52Y02P30/20
Inventor 计建炳陆向红俞云良王云姬登祥
Owner ZHEJIANG UNIV OF TECH
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