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Medium temperature and low pressure process to prepare biological diesel oil

A technology for biodiesel and oil, applied in the field of oil and ester chemistry, can solve the problems of long reaction time, numerous processes, unstable process, etc., and achieve the effects of short reaction time, easy implementation and strong technical adaptability

Inactive Publication Date: 2006-08-02
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has problems such as low reaction conversion rate, long reaction time, numerous procedures, and unstable process, so it cannot be widely used in commercial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix 1000g soybean oil and 200g methanol, add 10g ZnO catalyst, stir and mix evenly, then pour into a pressurized reactor, when heated to 190°C, pressurize to 0.5MPa, and then keep under this condition for 5 hours.

[0016] The pressurized reactor is cooled and depressurized, and the unreacted methanol is distilled off at 70-75° C. After standing still, the lower layer catalyst and glycerin water are separated to obtain crude biodiesel. Distilled methanol can be recycled.

[0017] with 10% Na 2 CO 3 Saturated salt water neutralizes and washes crude biodiesel to obtain neutral crude biodiesel.

[0018] The neutral crude biodiesel is subjected to continuous vacuum distillation, and the fraction between 130-190°C is collected under a vacuum degree of <5 mmHg to obtain the finished biodiesel.

Embodiment 2

[0020] Mix 1000g of recovered edible waste oil with 150g of methanol, add 15g of solid superacid D72, stir and mix evenly, pour it into a pressurized reactor, when heated to 150°C, pressurize to 1.5MPa, and then maintain 5.5MPa under this condition Hour.

[0021] The pressurized reactor is cooled, depressurized, and unreacted methanol is distilled off at 90°C. After standing still, the lower layer catalyst and glycerin water are separated to obtain crude biodiesel. Distilled methanol can be recycled.

[0022] with 10% Na 2 CO 3 Saturated salt water neutralizes and washes crude biodiesel to obtain neutral crude biodiesel.

[0023] The neutral crude biodiesel is subjected to continuous vacuum distillation, and the fraction between 130-190°C is collected under a vacuum degree of <5 mmHg to obtain the finished biodiesel.

Embodiment 3

[0025] Mix 1000g of vegetable oil soap stock and 170g of methanol, add 30g of solid alkali hydrotalcite, stir and mix evenly, pour into a pressurized reactor, heat to 290°C, pressurize to 0.2MPa, and then keep at this temperature for 5.5 hours.

[0026] The pressurized reactor was cooled, depressurized, and unreacted methanol was distilled off at 98°C, and after standing still, the lower catalyst and glycerin water were separated to obtain crude biodiesel. Distilled methanol can be recycled.

[0027] with 10% Na 2 CO 3 Saturated salt water neutralizes and washes crude biodiesel to obtain neutral crude biodiesel.

[0028] The neutral crude biodiesel is subjected to continuous vacuum distillation, and the fraction between 130-190°C is collected under a vacuum degree of <5 mmHg to obtain the finished biodiesel.

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PUM

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Abstract

The present invention is one medium temperature and low pressure process to prepare biological diesel oil with animal and plant oil and grease and waste oil and grease as main material. The preparation process includes the following steps: 1. mixing oil and grease 1000 weight portions, methanol 150-200 weight portions and catalyst 5-30 weight portions inside a reactor, and heating and pressurizing to 150-300 deg.c and 0.15-1.57 MPa to reaction for 4-6 hr; 2. lower to normal pressure, distilling to eliminate residual methanol, and stilling to separate out catalyst and glycerin water in the lower layer and to obtain crude biological diesel oil product; 3. washing with saturated table salt solution containing 10úÑ concentration Na2CO3 to obtain neutral crude biological diesel oil product; and 4. continuous vacuum distilling to collect 130-190 deg.c fraction as the biological diesel oil product at vacuum degree 5 mmHg. The present invention has the advantages of short reaction time, etc.

Description

technical field [0001] The invention relates to a method for preparing biodiesel by a medium-temperature and low-pressure method, belonging to the field of oil and ester chemistry. Background technique [0002] Biodiesel refers to the organic oil produced by transesterification from oil crops such as soybeans and rapeseeds, oil forest fruits such as oil palm and pistachio, engineering microalgae and other oil aquatic plants, animal fats and waste cooking oil, etc. Fatty acid ester fuel, which has the advantages of high cetane number, no sulfur and no aromatic compounds, can be biodegraded, non-toxic, harmless to the environment, and has a higher flash point than petrochemical diesel, which is more conducive to safe transportation and storage. In recent years, the global energy shortage has intensified, mineral energy has become increasingly scarce, and the development of alternative energy has become an inevitable trend. Biodiesel, an environmentally friendly clean and rene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 陈登龙丁以佃陈庆华吴钦缘颜秋萍
Owner FUJIAN NORMAL UNIV
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