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Technical method for preparing biodiesel using reactive separation process coupling technique

A separation process, biodiesel technology, applied in the preparation of liquid hydrocarbon mixtures, petroleum industry, biological raw materials, etc., to avoid subsequent processing problems and improve speed

Inactive Publication Date: 2005-12-21
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 Preparation of Biodiesel by Methanol and Cottonseed Oil Using Reaction Separation Process Coupling Technology

[0041] (1) the reaction of raw material low carbon alcohol and cottonseed oil;

[0042] The raw material low-carbon alcohol (methanol) and cottonseed oil in a molar ratio of 6:1 were fed into the reactor 1 through a pump, and the reaction was carried out under the action of a catalyst and maintained at a temperature of 230°C. At this temperature, methanol with a low boiling point is circulated at a space velocity of 0.6L / (hr*gcal.) (liquid state), and discharged as a gas through the gas phase outlet; the space velocity of the raw oil is 0.025L / (hr*gcal.) ) (liquid);

[0043] (2) the product obtained by the first step reaction is separated;

[0044] The product fatty acid methyl ester and glycerol are taken out of the reactor 1 and entered into the rectifying tower 2 while the methanol is recycled in a large amount;

[0045] The glycerol and mixed ...

Embodiment 2

[0051] Embodiment 2. Process method for preparing biodiesel by using reaction separation process coupling technology from low carbon alcohol and animal fat

[0052] (1) Reaction of raw material low-carbon alcohol and animal fat

[0053] According to the molar ratio of animal oil and low-carbon alcohol (ethanol) is 3:1, add catalyst and raw material animal oil and low-carbon alcohol (ethanol) in reactor 1, and the consumption of catalyst is 1wt% of the raw material oil in the reactor; Maintain at 170°C; the space velocity of circulating low-carbon alcohol is 0.5L / (hr*gcal.); the space velocity of raw oil is 0.02L / (hr*gcal.); carry out the reaction;

[0054] (2) the product obtained by the first step reaction is separated and separated the product of the first step transesterification reaction, so that fatty acid ester and glycerol are separated from the reaction system;

[0055] Keep the reaction temperature constant at 170°C, make the low-boiling low-carbon alcohol flow out f...

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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 process for preparing biodiesel (fatty acid ester) by transesterification of vegetable oil and low-carbon alcohol, and belongs to the technical field of chemical technology. Background technique [0002] In recent years, the depletion of the world's oil resources and the air pollution caused by oil burning have prompted people to look for new alternative energy sources. The production of fatty acid esters (biodiesel) from animal and vegetable oils and fats through transesterification with fatty alcohols has attracted more and more attention in recent years as a potential substitute for diesel energy. [0003] The main components of animal and vegetable oils are triglyceride fatty acid esters, and the complete transesterification reaction is a series of reversible reactions carried out in three steps: [0004] Triglyceride+ROHDiglyceride+R'COOR [0005] Diglyceride+ROHMonoglyceride+R″COO...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02E50/10Y02P30/20
Inventor 王金福陈和王德峥王光润
Owner TSINGHUA UNIV
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