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Quick and clean process for preparing biological diesel oil with esterification/ester exchange reaction

A technology of transesterification reaction and biodiesel, which is applied in the field of energy and chemical industry, can solve the problems of high production energy consumption and cost, difficult realization of heating engineering, discharge of washing wastewater, etc., and achieves low equipment corrosion, simplified post-treatment process, supercritical The effect of mild conditions

Inactive Publication Date: 2008-12-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing industrial production methods have the following disadvantages: 1) refined oil and fat are required, which requires high raw materials; 2) there are a large number of waste acid and alkali discharges and washing wastewater discharges in the production process, causing environmental problems; 3) product follow-up The purification process is complicated, and the production energy consumption and cost are high
The supercritical method is in the process of industrialization, but the supercritical method requires high temperature and high pressure (>240°C,>8MPa), high energy consumption, difficult engineering implementation of heating in the process, and high equipment requirements

Method used

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  • Quick and clean process for preparing biological diesel oil with esterification/ester exchange reaction
  • Quick and clean process for preparing biological diesel oil with esterification/ester exchange reaction

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0033]Embodiment 1: Take 70.0g of acidified oil with an acid value of 50mgKOH / g, the amount of methanol is calculated according to the molar ratio of alkyd to 10:1, which is 1.0g, catalyst H 2 SO 4 The dosage is 1.5‰ of the oil weight, which is 0.10g, the reaction temperature is 120°C, the reaction time is 15 minutes, and the pre-esterification conversion rate can reach 98%. Mix the dehydrated refined oil with 100.0g methanol uniformly, and pre-add NaOH with 1‰ of the oil weight into the methanol. Rapeseed oil and methanol were added to a high temperature and high pressure airtight reactor with a volume of 300 ml. The reaction temperature is 200° C., and the reaction pressure is 2.5 MPa; after 15 minutes of reaction, the reactor is cooled to room temperature, the excess methanol is distilled under reduced pressure, and the product is allowed to stand and separate into layers. The upper layer is the methyl ester layer and the lower layer is the glycerin layer. The oil conversion ra...

Embodiment approach 2

[0034] Embodiment 2: The pre-esterification catalyst H in the above embodiment 1 2 SO 4 The addition amount was changed to 0.7‰ of the oil weight, and other conditions were unchanged. The experimentally measured pre-esterification conversion rate was 87%. After transesterification, the glycerin content in the methyl ester is less than 1%, the acid value is less than 0.5mgKOH / g, the sulfur content is less than 0.05%, and the alkali content is less than 10mg / kg.

Embodiment approach 3

[0035] Embodiment 3: Change the NaOH addition amount of the transesterification catalyst in the above embodiment 1 to 0.5‰ of the oil weight, other conditions remain unchanged, the fat conversion rate measured by the experiment is 88.5%, and the glycerin content in the methyl ester is less than 1%. The acid value is less than 0.5mgKOH / g, the sulfur content is less than 0.05%, and the alkali content is less than 10mg / kg.

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Abstract

The invention relates to a novel process for preparing biodiesel through natural oil which has different acid numbers and a rapid esterification / ester interchange reaction with catalysts of minute quantity at an alcohol-oil consolute temperature. The process comprises the following steps of: taking animal and vegetable oil as raw materials, adding the oil and methanol into a reaction kettle according to an alkyd mol ratio of 2 to 1-10 to 1 for rapid esterification, and adding the acid catalyst of minute quality which is 0.01-1 per mille of the weight of the oil with reaction conditions of 120-200 DEG C, 2.0-8.0Mpa, and 10-30min; after neutralization deacidification, adding refined oil and methane into a high-pressure reaction kettle according to a mol ratio of 1 to 6-1 to 20 for rapid ester interchange, and adding a base catalyst of minute quality which is 0.01-1 per mille of the weight of the refined oil with reaction conditions of 140-200 DEG C, 2.0-8.0Mpa, and 5-20min; carrying out the sedimentation or centrifuge of a reaction product, and generating a qualified biodiesel product after removing methane through upper layer liquid phase distillation. The process uses minute quantity of catalysts and does not need separation with quick reaction and simple procedure without pollution and corrosion. The process has the advantages of mild conditions, environmental protection and remarkable efficiency.

Description

1. Technical Field [0001] The invention relates to the field of energy and chemical industry, and relates to the production and preparation of renewable energy. It belongs to a clean and green chemical process. It is a kind of pre-esterification and transesterification catalyzed by animal and vegetable oils under the condition of subcritical methanol phase with a trace acid catalyst Method of preparing biodiesel. 2. Background technology [0002] In recent years, more and more attention has been paid to the research and development of biomass fuels, and the production of biodiesel is currently one of the most important biomass fuels. Biodiesel generally refers to the monoalkyl esters of long-chain fatty acids produced by the transesterification of animal and vegetable oils with short-chain alcohols, and the current commercialization is mainly fatty acid methyl esters. Biodiesel is non-toxic, high cetane number, and good lubricating performance. It can directly replace petroleum d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/04C11C3/10C10G3/00
CPCY02E50/10Y02P30/20
Inventor 梁斌蒋炜鲁厚芳刘颖颖齐涛雷姣
Owner SICHUAN UNIV
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