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Process for preparing bio- diesel oil by two-step catalysis of acid-containing fat

A biodiesel and oil technology, applied in the chemical industry, can solve the problems of cumbersome process and waste acid, and achieve the effect of high esterification rate and wide applicability of raw materials

Active Publication Date: 2006-10-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the traditional acid catalysis is completed, a large amount of water washing is usually used to remove the residual inorganic acid catalyst in the reaction system. The process is cumbersome and produces a large amount of waste acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Using the present invention to convert acidified oil with an acid value of 120 mgKOH / g and a saponification value of 175 mgKOH / g.

[0012] (1) Acid catalysis: mix acid-containing grease, methanol and sulfuric acid at a ratio of 100:50:4 and add them to a stirring reactor for reaction, and the reaction temperature is controlled at 80°C. The reaction was stopped after 2 hours, and the conversion rate at this time was measured to be 72%.

[0013] (2) Acid precipitation: After recovering most of the methanol, add 10 g of solid salt to the reactant, continue heating and stirring for 0.5 hours, then filter to remove the precipitate, and the acid value of the filtrate is 2.1 mgKOH / g.

[0014] (2) Alkali catalysis: Add 50 g of methanol and 2 g of NaOH to the filtrate as a catalyst, further esterify the remaining oil at 60° C., and stop the reaction after 1 hour. The reactants were statically separated into layers, and the acid value of the upper diesel phase was mea...

Embodiment 2

[0015] Embodiment 2: Adopting the present invention to convert waste oil with an acid value of 74 mgKOH / g and a saponification value of 180 mgKOH / g.

[0016] (1) Acid catalysis: mix acid-containing grease, methanol and sulfuric acid at a ratio of 100:40:4 and add them to a stirring reactor for reaction, and the reaction temperature is controlled at 40°C. The reaction was stopped after 5 hours, and the conversion rate was measured to be 50%.

[0017] (2) Acid precipitation: After recovering most of the methanol, add 10 g of solid salt to the reactant, continue heating and stirring for 0.5 hours, then filter to remove the precipitate, and the acid value of the filtrate is 0.8 mgKOH / g.

[0018] (2) Alkali catalysis: Add 50 g of methanol and 3 g of NaOH to the filtrate as a catalyst, further esterify the remaining oil at 60° C., and stop the reaction after 1 hour. The reactants were statically separated into layers, and the acid value of the upper diesel phase was measured to be ...

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Abstract

The provided preparation method for bio-diesel by two-stage catalysis comprises: mixing acid-contained grease, methanol and H2SO4 as 100:15-50:0.5-2 to react in reactor at 40-80Deg; adding BaCO3 to remove residual H2SO4 by filtering solid; with NaOH or KOH as catalyst, adding methanol for further esterification; keeping static for layering with top as coarse product for rectifying to obtain the target and bottom as mixture of glycerine and methyl. This invention has high conversion ratio and no waste release.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a two-step catalyzed method for preparing biodiesel from acid-containing oil. Background technique [0002] Biodiesel is a renewable fuel made from oily raw materials, the main component of which is fatty acid methyl esters. At present, the industrial preparation of biodiesel mainly uses chemical methods, that is, animal and vegetable oils and low-carbon alcohols such as methanol or ethanol are used for transesterification under the action of acidic or alkaline catalysts to generate corresponding fatty acid methyl esters or ethyl esters (biological diesel fuel). Alkali catalysts mainly include NaOH, KOH, carbonates and alkoxides (such as sodium methoxide, sodium ethoxide, etc.); acid catalysts mainly include sulfuric acid, phosphoric acid, hydrochloric acid and sulfonic acid. [0003] The speed of alkali catalysis is fast, but the quality requirements of raw materials...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 刘德华李俐林李强杜伟
Owner TSINGHUA UNIV
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