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Method for producing biological diesel oil by using waste oil

A biodiesel and oil degumming technology, which is applied to the preparation of biological raw materials, biofuels, and liquid hydrocarbon mixtures, can solve problems such as improper wastewater treatment, unstable condensation point, and product quality fluctuations, and achieve the effect of convenient post-processing

Inactive Publication Date: 2008-08-20
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the existing technology of using waste animal and vegetable oil to produce biodiesel is mainly to carry out esterification and transesterification of waste oil under the condition of acidic or inorganic basic catalyst (such as NaOH, KOH, etc.), because the quality of waste oil will vary greatly. Large fluctuations, the quality of products using traditional production methods also fluctuates, and the quality of the obtained products is unstable, especially the main index of the condensation point is unstable, often as high as about 10°C, and production is difficult to control
[0005] In addition, in the production process of the traditional method, a large amount of water needs to be used to wash the crude ester, and the large amount of waste water generated is not properly treated, and it is easy to cause environmental pollution.

Method used

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Examples

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Effect test

example 1

[0025] Take 200mL of animal and vegetable waste oil, add 0.36g of phosphoric acid, heat to 70°C, stir for half an hour, add 20mL of water, stir slowly for one hour, let stand for one hour, release the lower layer of water and colloid, at a pressure of 0.085Mpa, a temperature of 85 Vacuum dehydration under the condition of ℃, the water content is controlled below 0.5%. Add 8mL of methanol and 3.6g of boric acid, heat to 45°C, react for two hours, add 32mL of methanol and 4.8g of diethanolamine catalyst to the upper layer after standing still, heat to 70°C, reflux and stir for 4 hours, stand still for more than eight hours, and evaporate the upper layer After the methanol was cooled to -5°C, the wax was separated, which was biodiesel, with a yield of 92%.

example 2

[0027] In a 500mL four-neck flask, add 270.2 grams of degummed and dehydrated waste oil, 23.7 grams of methanol, 4.0 grams of zirconium sulfate, add 0.3 mL of sulfuric acid, control the temperature at 45-50 ° C, stir for two hours, and stand for more than eight hours to separate For the upper layer, add 29.3 grams of methanol and 10.5 grams of ethanolamine catalyst, heat to 68 ° C, reflux and stir for 4 hours, put the product into a separatory funnel, after standing still, evaporate the unreacted methanol from the separated upper layer, and put it in a refrigerator at 0 ° C After 30-60 minutes, the upper layer is biodiesel with a lower freezing point, and the yield is 90%.

example 3

[0029] In a 2000mL four-neck flask, add 1000g of degummed and dehydrated waste oil, 69.5g of methanol, 1.2mL of sulfuric acid, heat to 50°C, stir for two hours, add NaCO 3 Neutralize to bring the system to pH=6.0-7.5, then continue to stir for 40 minutes. Separate the upper layer after standing for eight hours, add 370.5 grams of methanol and 18 grams of triethanolamine, heat to 72 ° C, stir, reflux for 4 hours, stand for eight hours, separate the upper layer, and evaporate the unreacted methanol in the upper layer Place in -10°C refrigerator for 30-60 minutes, the upper layer is biodiesel, with a yield of 95%.

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Abstract

The invention provides a method for utilizing waste oil to produce bio-diesel, which regards waste animal and vegetable oil as raw materials, in the producing process, no water-washing is needed, and the method consists of the following steps, first, pretreatment, degumming and dewatering the waste oil, second, pre-esterification, heating the raw material after pretreatment, and stirring the material with methyl alcohol and acid catalyst for reaction, third, alcoholysis, adding methyl alcohol and organic alkali catalyst into the material after pre-esterification for heating reaction, fourth, glaciation, bio-diesel being got after separation. The method degums the waste oil so as to eliminate the influence of gummy matter towards following steps and assure the stability of the process, saponification is avoided, which can cause waste products in block, and the products can reach the main index of 0<model> diesel, the cold filter plugging point is lower than 0 DEG C, the close flash point is more than 65 DEG C, the conversion rate (utilization rate) after pretreatment can reach more than 90 percent, no water-washing is needed so as not to produce a great amount of industrial wastewater to pollute the environment and the post treatment of products is rather convenient.

Description

technical field [0001] The invention belongs to the field of organic chemistry, and in particular relates to a method for preparing biodiesel from waste oil. Background technique [0002] Gutter waste oil is mainly animal and vegetable oils, which come from waste oils discarded by food oil processing enterprises or separated from catering wastewater. These waste oils contain inedible harmful substances and must be discarded. At the same time, these waste oils also bring certain pressure. Transforming waste oil from waste oil into clean fuel—biodiesel not only improves the comprehensive utilization rate of resources, turns waste into treasure, but also solves environmental problems to a certain extent, and provides a new alternative energy source. [0003] Animal and vegetable oils often undergo a series of reactions such as oxidation, cracking, and polymerization after high temperature, resulting in darker oil color, higher acid value (70-190mg KOH / g), more impurities, and ...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02P30/20Y02E50/10
Inventor 蒋皎梅陈国松
Owner NANJING UNIV OF TECH
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