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Two-step solid acid and solid alkali catalyzing process for producing biodiesel oil

A solid base catalyst and biodiesel technology, which is applied in the preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems of difficult separation of products, environmental pollution of wastewater, corrosion of production equipment, etc., and achieve high conversion rate and low energy consumption. The effect of low, mild reaction conditions

Inactive Publication Date: 2009-09-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing problems are: the liquid concentrated sulfuric acid catalyst is seriously corrosive to the production equipment; saponification easily occurs in the transesterification step, making it difficult to separate the product, and a large amount of waste water is produced, causing serious pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: be that waste oil of 22mgKOH / g is raw material production biodiesel with acid value

[0015] (1) Solid acid catalyzed esterification: add 100g waste oil and 18g glycerin into the stirring reactor and stir for pre-mixing for 5min, then add 4.0g solid acid catalyst SO 4 2- / ZrO 2 , the reaction was stirred under normal pressure, and the reaction temperature was controlled at 180° C.; the reaction was stopped after 10 h.

[0016] (2) Isolate the solid acid catalyst: filter the mixture obtained after the reaction to remove the solid acid catalyst, and separate unreacted glycerin and water. The acid value of the measured oil is 1.2mgKOH / g. The solid acid catalyst can be recycled after recycling.

[0017] (3) Solid base catalyzed transesterification: Take out the filtrate and add 25g of methanol into another stirred reactor and stir for 3 minutes, then add 2g of CaO powder, stir and react under normal pressure, the reaction temperature is controlled at 65°C;...

Embodiment 2

[0019] Embodiment 2: the soybean oil-lauric acid mixed oil that is 40mgKOH / g with acid value is raw material production biodiesel

[0020] (1) Solid acid catalyzed esterification: Add 100g soybean oil-lauric acid mixed oil and 20g methanol into the stirring reactor and stir for pre-mixing for 5min, then add 2g solid acid catalyst SO 4 2- / ZrO 2 The stirring reaction was carried out, the reaction temperature was controlled at 90° C., and the reaction was stopped after 3 hours.

[0021] (2) Isolate the solid acid catalyst: filter the mixture obtained after the reaction to remove the solid acid catalyst, and drain the water layer after standing for stratification. The acid value of the measured oil is 3.3 mgKOH / g.

[0022] (3) Solid base catalyzed transesterification: Take out the filtrate and add 15g of methanol into another reactor to stir and mix for 4min, then add 3g of CaO powder to continue the stirring reaction, the reaction temperature is controlled at 75°C; the reacti...

Embodiment 3

[0024] Embodiment 3: be the soybean oil-oleic acid mixed oil that acid value is 13mgKOH / g as raw material production biodiesel

[0025] (1) Solid acid catalyzed esterification: Add 100g soybean oil-oleic acid mixed oil and 30g methanol into the stirring reactor and stir for pre-mixing for 5min, then add 3gSO 4 2 / ZrO 2 A stirring reaction was carried out, and the reaction temperature was controlled at 120°C. The reaction stopped after 3h.

[0026] (2) Isolate the solid acid catalyst: filter the mixture obtained after the reaction to remove the solid acid catalyst, and drain the water layer after standing for stratification. The measured acid value of the oil is less than 1.0 mgKOH / g.

[0027] (3) Solid base catalyzed transesterification: take out the filtrate and add 25g of methanol, use an emulsifier to emulsify at a constant speed of 4000r / min for 5min, then quickly transfer the emulsion to the reactor, add 4g of CaO powder, and stir the reaction under normal pressure. ...

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Abstract

The two-separate solid acid and solid alkali catalyzing process for producing biodiesel oil includes the following steps: mixing the oil and grease material, alcohol and solid acid catalyst in the weight ratio of 100 to 10-50 to 0.5-4 through stirring in the reactor and reaction at 50-200 deg.c; filtering the reacted mixture to eliminate solid acid and separating out water; mixing the filtrate, low carbon alcohol and solid alkali catalyst in the weight ratio of 100 to 10-50 to 0.5-4 through stirring in the reactor and reaction at40-100 deg.c for 1-8 hr; filtering the reacted mixture to eliminate solid alkali, separating out glycerin, and distilling to eliminate methyl or ethyl to obtain biodiesel oil product. The process is suitable for various kinds of high acid value oil and grease, and has high conversion rate, mild reaction condition, capacity of reusing catalyst, alcohol and glycerin, low production cost and environment friendship.

Description

technical field [0001] The invention relates to a biodiesel production process. Background technique [0002] At present, the industrial production of biodiesel mainly adopts the transesterification method (ie alcoholysis method). The transesterification method is to react animal oil, vegetable oil and low-carbon alcohol under the action of a catalyst to generate fatty acid methyl ester (ie biodiesel) and glycerin. The production process of the transesterification method is simple, low in cost and easy to control, and has received widespread attention at home and abroad. The reaction can use acid, alkali or enzyme as a catalyst, wherein the commonly used acid catalyst is sulfuric acid, phosphoric acid or hydrochloric acid, the basic catalyst includes NaOH, KOH, various carbonates and alkoxides of sodium and potassium, and the enzyme catalyst generally refers to fat enzyme. [0003] At present, waste vegetable oil is generally used as raw material in China, and the acid va...

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 张彬彬杨乐夫蔡俊修张国玉林静蔡钒
Owner XIAMEN UNIV
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