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A method for demulsifying emulsified biodiesel

A biodiesel and demulsification technology, applied in chemical instruments and methods, biofuels, separation methods, etc., can solve the problems of high price of compound demulsifier, high centrifugal speed, and no demulsification method for emulsified biodiesel. Good demulsification effect, realizing the effect of recycling

Active Publication Date: 2017-08-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that the price of the compound demulsifier is relatively high
The problem that this method exists is: ethanol consumption is big, and centrifugal speed is high
The problem with this method is that impurities such as polyamine polyoxypropylene polyoxyethylene ether and higher alcohols that are difficult to remove are introduced into the system.
The problem with this method is that the introduction of amides and alkylamines into the system is not suitable for fuel oil demulsification
[0008] In summary, although the above-mentioned patents involve the demulsification of oil-water two-phase, none of them involve the demulsification of biodiesel, and there is no demulsification method specifically for emulsified biodiesel during biodiesel transportation.
However, biodiesel has many characteristics different from other oils such as vegetable oil, acidified oil, fermentation liquid, crude oil, heavy oil, etc. The impurities introduced into the biodiesel system may destroy the properties of biodiesel, thereby affecting the use of biodiesel products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This example illustrates that the present invention can be implemented using a mixed demulsifier of n-butanol and n-propanol.

[0031] Preparation of mixed alcohol demulsifier: 50mL of n-butanol and 50mL of propanol are stirred and mixed to obtain a mixed demulsifier with a volume fraction of n-butanol of 50%.

[0032] Demulsification method: first add 100mL of emulsified Hainan biodiesel into a 250mL separatory funnel, then add 2.5mL of n-butanol-n-propanol mixed alcohol demulsifier, and shake vigorously for 3 minutes. Then the above mixture was centrifuged at room temperature at 3000 rpm for 10 min to obtain a clear biodiesel phase and an aqueous phase without a third phase and a clear interface, and the demulsification of the emulsified biodiesel was achieved well. Then separate the oil and water phases. Finally, the alcohol is recovered through the route (2): the biodiesel phase is distilled under reduced pressure at 120°C, and the recovered mixed alcohol demulsifi...

Embodiment 2

[0034] This example illustrates that the present invention can be implemented using a tert-butanol-ethanol mixed demulsifier.

[0035] Preparation of mixed alcohol demulsifier: 80mL of tert-butanol and 20mL of ethanol are stirred and mixed to obtain a mixed demulsifier with a volume fraction of tert-butanol of 80%.

[0036] Demulsification method: first add 100mL of emulsified Bilu biodiesel to a 250mL separatory funnel, then add 10.0mL of tert-butanol-ethanol mixed alcohol demulsifier, and shake vigorously for 3 minutes. Then the above mixture was centrifuged at room temperature at 1500 rpm for 30 min to obtain a clear biodiesel phase and water phase without a third phase and a clear interface, and the demulsification of the emulsified biodiesel was achieved well. Then separate the oil and water phases. Finally, the alcohol is recovered through the route (2): the biodiesel phase is distilled under reduced pressure at 130°C, and the recovered mixed alcohol demulsifier can be ...

Embodiment 3

[0038] This example illustrates that the present invention can be implemented using a 1-pentanol-ethylene glycol mixed demulsifier.

[0039]Preparation of mixed alcohol demulsifier: 70mL of 1-pentanol and 30mL of ethylene glycol were stirred and mixed to obtain a mixed demulsifier with a volume fraction of 1-pentanol of 70%.

[0040] Demulsification method: first add 100mL of emulsified Hainan biodiesel to a 250mL separatory funnel, then add 1.0mL of 1-pentanol-ethylene glycol mixed alcohol demulsifier, and shake vigorously for 3 minutes. Then the above mixture was centrifuged at room temperature at 3000 rpm for 10 min to obtain a clear biodiesel phase and an aqueous phase without a third phase and a clear interface, and the demulsification of the emulsified biodiesel was achieved well. Then separate the oil and water phases. Finally, alcohol is recovered through route (1): wash 100mL of biodiesel phase with 50mL of water twice, centrifuge and separate the phases, heat the bi...

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Abstract

The invention provides a method for demulsifying emulsified biodiesel. The method comprises the following steps: adding a single or mixed alcohol demulsification agent into emulsified biodiesel, performing centrifugal separation after the single or mixed alcohol demulsifier sufficiently contacts with the emulsified biodiesel, thereby obtaining clear biodiesel phase and water phase, further separating the biodiesel phase from the water phase, and finally recycling alcohol in one of the two following ways: (1) washing the biodiesel phase with water for 1-3 times, separating the phase, heating the water phase, and recycling the alcohol demulsifier to be circulated and reused; (2) heating the biodiesel phase, and recycling the alcohol demulsifier to be circulated and reused. The method provided by the invention has the advantages that a good demulsification effect on the emulsified biodiesel is achieved, most demulsifier can be recycled and reused, the property of the emulsified biodiesel is not damaged, and other impurities are not introduced into a biodiesel system.

Description

technical field [0001] The invention relates to a method for demulsifying emulsified biodiesel. Background technique [0002] Biodiesel is a type of diesel produced from renewable natural oil resources. Natural oils such as animal and vegetable oils are mostly composed of triglycerides of straight-chain fatty acids. After transesterification between animal and vegetable oils and methanol, fatty acid methyl esters are obtained. The molecular weight of the obtained fatty acid methyl ester is close to that of diesel oil, so it has a performance closer to that of diesel oil, and because it is derived from animal and vegetable oils, it is called biodiesel. Biodiesel has the characteristics of non-toxic, sulfur-free, complete combustion, biodegradability, and excellent lubricating properties, which is of great significance to reduce air pollution and greenhouse gas emissions. With the increasing consumption of fossil energy and the continuous reduction of reserves, as well as th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11B3/00B01D17/05C10L1/02
CPCB01D17/047B01D17/048B01D2259/124C10L1/02C11B3/001Y02E50/10
Inventor 张伟王海京杜泽学陈艳凤曾建立高国强
Owner CHINA PETROLEUM & CHEM CORP
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