Technical method for preparing biodiesel using reactive separation process coupling technique

A technology of biodiesel and separation process, which is applied in the field of chemical technology to avoid the problem of subsequent treatment of catalysts and improve the speed.

Inactive Publication Date: 2008-03-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no research and exploration on the new process of preparing biodiesel through transesterification with heterogeneous catalysts

Method used

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  • Technical method for preparing biodiesel using reactive separation process coupling technique
  • Technical method for preparing biodiesel using reactive separation process coupling technique
  • Technical method for preparing biodiesel using reactive separation process coupling technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Method for preparing biodiesel from methanol and cottonseed oil using reaction separation process coupling technology

[0039] (1) The reaction between the raw material low-carbon alcohol and cottonseed oil;

[0040] The raw material low-carbon alcohol (methanol) and cottonseed oil at a molar ratio of 6:1 are fed into the reactor 1 through a pump, and the reaction is carried out under the action of a catalyst and maintained at a temperature of 230°C. At this temperature, low-boiling methanol circulates at a space velocity of 0.6L / (hr*gcal.) and is discharged as a gas through the gas phase outlet; the space velocity of the feed oil is 0.025L / (hr*gcal.);

[0041] (2) Separate the product obtained in the first step reaction;

[0042] While the methanol is circulating in a large amount, the product biodiesel and glycerin are taken out of the reactor 1 and enter the distillation tower 2

[0043] The glycerin and mixed oil in the reactor 1 are discharged from the bottom...

Embodiment 2

[0049] Example 2 Method for preparing biodiesel by coupling technology of reaction separation process with low-carbon alcohol and animal fat

[0050] (1) Reaction of raw material low-carbon alcohol and animal fat

[0051] According to the molar ratio of animal oil to low-carbon alcohol (ethanol) of 3:1, the catalyst and raw material animal fat and low-carbon alcohol (ethanol) are added to the reactor 1, and the amount of the catalyst is 1wt% of the raw material fat in the reactor; The temperature is maintained at 170°C; the space velocity of the circulating lower alcohol is 0.5L / (hr*gcal.); the space velocity of the raw oil is 0.02L / (hr*gcal.); the reaction is carried out;

[0052] (2) Separate the products obtained in the first step of the reaction

[0053] Separate the products of the first step transesterification reaction to separate biodiesel and glycerin from the reaction system;

[0054] Keep the reaction temperature at 170°C, make the low-boiling low-carbon alcohol flow ou...

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Abstract

This is the craft method of preparing biological diesel oil by using the coupling technology in reaction separating course. It relates to the new craft of preparing biology diesel oil (fatty diethylene glycol dinitrate) through the ester exchange reaction of vegetable oil and higher alcohols, and belongs to chemical industry craft technology field. It includes: the ester exchange reaction of vegetable oil and higher alcohols; the separation of product fatty diethylene glycol dinitrate, glycerol and reaction mixed liquid; the separation of product fatty diethylene glycol dinitrate, glycerol and higher alcohols; the separation of fat diethylene glycol dinitrate and glycerol; the condensation backflow of fatty alcohol; and the separation of glycerol. It makes the circumvolving higher alcohols carry out the product fatty diethylene glycol dinitrate and glycerol through higher reaction temperature, and realizes the separation of outcome and reactant; the non-homogeneous phase catalyst stays in the actor, and don't need to have following process to the catalyst. The invention realizes the coupling of reaction and separation courses, speeds up the speed of non-homogeneous phase reaction, and avoids the problem of the following process to catalyst in the homogeneous phase process. Besides it can save production cost, and improves the producing performance of biology diesel oil.

Description

Technical field [0001] The invention relates to a new method for preparing biodiesel through the transesterification reaction of a mixture of animal fats and vegetable fats and low-carbon alcohols, and belongs to the technical field of chemical processes. Background technique [0002] In recent years, the depletion of world oil resources and the air pollution caused by oil burning have prompted people to look for new alternative energy sources. Biodiesel is produced from a mixture of animal fats and vegetable fats through transesterification with low-carbon alcohols. As a potential diesel energy substitute, more and more attention has been paid in recent years. [0003] The main component of the mixture of animal fats and vegetable fats is glycerol triglyceride biodiesel, and the complete transesterification reaction is a series of reversible reactions carried out in three steps: [0004] [0005] [0006] [0007] In the traditional reaction process, strong acids (sulfuric...

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 王金福陈和王德峥王光润
Owner TSINGHUA UNIV
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