Method for producing biological diesel oil through homogeneous successive reaction

A biodiesel and oil technology, applied in the preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems of difficult industrialized production, few continuous productions, harsh reaction conditions, etc., to enhance mutual solubility and shorten the Reaction time, effect of lowering reaction temperature

Inactive Publication Date: 2007-02-21
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Judging from the existing technologies, most of them adopt batch production methods of kettles and tanks. There are not many continuous productions, and most of the continuous productions are reacted under supercr

Method used

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  • Method for producing biological diesel oil through homogeneous successive reaction
  • Method for producing biological diesel oil through homogeneous successive reaction

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Embodiment 1

[0031] Mix natural oil or frying waste oil, methanol, alkali metal hydroxide as a catalyst, and an organic solvent that can make the mixed liquid form a homogeneous phase, and send it to a preheater at a temperature of 30-90°C, and preheat for 1-20°C. 30 minutes, making it completely miscible to form a homogeneous system, wherein the organic solvent is one or more mixtures of ethers and ketones, or a mixture of at least one ethers and / or ketones and at least one saturated alkane The mixture, the ethers and ketones are stable to acids and alkalis and have a boiling point below 150°C, saturated alkanes have between 6 and 9 carbon atoms and a boiling point below 150°C, and the volume ratio of methanol and oil is 0.24 to 2: 1. Organic solvent volume / grease weight = 0.1L-4L / kg, the amount of catalyst alkali metal hydroxide accounts for 0.3%-2% of the grease weight; the mixed liquid is sent into the pipeline at a temperature of 40-90°C from the preheater The reactor is used for cont...

Embodiment 2

[0035]Firstly, the tube type preheater is preheated to 45°C, and the tube type reactor heating furnace is heated to 65°C. Water content is 0.1% soybean oil, methyl alcohol, tetrahydrofuran (by volume ratio 1: 1.2: 0.7) and the sodium hydroxide that accounts for soybean oil weight 0.7% is pumped into pipeline preheater, and flow velocity is 840ml / hr. After being preheated in the preheater for 2 minutes, the mixed solution enters the pipeline reactor, a temperature gradient is formed between the preheater and the reactor, and after being fully mixed and reacted for 5 minutes, it enters the distillation tower. Tetrahydrofuran and remaining methanol can be separated by distilling the mixed solution at a vacuum degree of 0-0.5 MPa, and returning to the feed pump for recycling after condensation. The still liquid enters the product separation tank and stands still, and biodiesel and crude glycerin products can be separated, and the yield of biodiesel is 97%.

Embodiment 3

[0037] Firstly, the tube type preheater is preheated to 35°C, and the tube type reactor heating furnace is heated to 62°C. Then the oil acid value is 8, the water content is 0.8% salad frying waste oil, methyl alcohol, isopropyl ether (by volume ratio 1: 1.7: 1.5) and the potassium hydroxide that accounts for salad frying waste oil weight 1.8% is pumped into Pipeline preheater with a flow rate of 620ml / hr. After being preheated in the preheater for 3 minutes, the mixed solution enters the pipeline reactor, a temperature gradient is formed between the preheater and the reactor, and after being fully mixed and reacted for 7 minutes, it enters the distillation tower. The isopropyl ether and residual methanol can be separated by distilling the mixed liquid, which is condensed and returned to the feed pump for recycling. The still liquid enters the product separation tank and stands still, and biodiesel and crude glycerin products can be separated, and the yield of biodiesel is 91...

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Abstract

This invention provides a homogeneous phase method for continuously manufacturing biodiesel oil. The method comprises: (1) mixing natural grease or waste fried oil, methanol, alkali metal hydroxide and an organic solvent that can homogenize the above mixed solution, sending into a prereactor, and preheating to obtain a homogeneous phase; (2) send ing into a tubular reactor, and continuously esterifying for 1-30 min to obtain biodiesel oil and glycerol; (3) distilling under normal pressure or reduced pressure to separate methanol and organic solvent, and separating by a separation tank to obtain biodiesel oil. The method makes grease and methanol completely mix in each other, thus largely increasing the reaction rate, shortening the reaction time, lowering the operation temperature, improving the equipment manufacture capacity.

Description

technical field [0001] The invention relates to a method for preparing biodiesel, in particular to a method for preparing biodiesel from natural oil or frying waste oil through homogeneous continuous reaction. Background technique [0002] Biodiesel obtained from natural oils through esterification or transesterification can replace fossil fuels and is a non-polluting, renewable green energy. With the current environmental and oil price issues becoming increasingly prominent, it is of far-reaching strategic significance to study the use of natural renewable raw materials to prepare biodiesel. [0003] At present, biodiesel is mainly produced by transesterification reaction of animal and vegetable oils and alcohols in the presence of a catalyst in a reactor. According to the different catalysts used, it can be divided into chemical catalysis and enzymatic catalysis. The current emerging method is to produce biodiesel by supercritical method without ...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 蒋剑春李翔宇孟中磊应浩聂小安
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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