CN201144226Y - A device for processing biodiesel - Google Patents

Abstract

The utility model discloses a device for processing biodiesel, which is composed of an esterification kettle, a methanol condenser, a double water absorber, a methanol storage tank, a high-efficiency cross-linking mixer, etc. There is a methanol booster pump between the mixers, and a material booster pump between the esterification tank and the high-efficiency crosslinking mixer. The double water absorber can remove the water in the esterification reaction of biodiesel synthesis, so that the reaction proceeds in the positive direction, thereby reducing the amount of methanol used; the high-efficiency cross-linking mixer can carry out intermolecular forced cross-linking of raw material oil, methanol and catalyst, The mutual solubility among the three is improved, thereby better solving the problem of low processing yield of biodiesel existing in the prior art.

Description

A device for processing biodiesel

technical field

The utility model belongs to fuel processing equipment, in particular to equipment for processing biodiesel.

Background technique

Biodiesel is a fuel that can replace mineral diesel produced by a series of processing using biomass resources as raw materials. Its raw material sources are mainly various waste cooking oils, vegetable oils, acidified oils, etc., but these raw material oils cannot be directly used as diesel vehicle fuel due to their high acid value or high viscosity. In order to make its physical properties close to "0#" mineral diesel oil, it is necessary to carry out methyl esterification processing on these raw materials. The main components of qualified biodiesel raw materials include triglyceride and fatty acid. The above two substances are esterified and transesterified to generate fatty acid methyl ester and remove the corresponding impurities. This is the basic process for processing biodiesel. At present, there are mainly three types of lower alcohol transesterification in China: 1. Chemical treatment; 2. Enzyme or resin catalysis; 3. Supercritical transesterification. The latter two treatment methods are relatively seldom used in domestic practice due to problems such as high production cost, low processing yield, and high equipment requirements. At present, most domestic biodiesel manufacturers mainly adopt chemical treatment; the reaction equation is as follows:

It can be seen from the above reversible reaction equation that there are two unfavorable situations for transesterification. One: water is produced in the product, and in industrial production, a part of air condensation water will be condensed to dilute methanol. The generation speeds up the reverse reaction, and the presence of water also deactivates the catalyst to increase the reaction equilibrium time. Second: It can also be seen from the reactants that the miscibility between methanol, grease and catalyst is very small, and the proportion difference between the three is large, which causes a certain degree of component stratification in the reactor, while We know that the chemical reaction is intermolecular. In the production process of biodiesel, one molecule of triglyceride and three molecules of methanol are transesterified under the action of a catalyst to generate three molecules of biodiesel and one molecule of glycerin. If triglycerides, methanol, and catalysts cannot be contacted at a large molecular level, the rate of transesterification will definitely be affected. The above two problems have always been the main factors that plague the chemical processing of biodiesel. The existence of the problem reduces the processing yield of biodiesel, increases the amount of methanol and catalyst and production time, and affects the product quality of biodiesel.

Utility model content

Aiming at the shortcomings of the prior art, the purpose of the utility model is to provide a device for processing biodiesel. The equipment adopts chemical treatment method, which can realize continuous dehydration in the reaction, and at the same time, the reactants are forced to cross-link to increase the reaction rate, greatly improve the processing yield of biodiesel, reduce the amount of methanol, speed up the reaction speed and improve production efficiency.

In order to achieve the above object, the technical scheme adopted by the utility model is: the equipment for processing biodiesel is composed of an esterification kettle, a methanol condenser, a double water absorber, a methanol storage tank, a high-efficiency cross-linking mixer, etc. There is a methanol booster pump between the storage tank and the high-efficiency cross-linking mixer, and a material booster pump between the esterification tank and the high-efficiency cross-linking mixer.

Further, a booster injection head can be set on the pipeline from the high-efficiency crosslinking mixer in the esterification tank.

In the technical scheme, the esterification tank and the methanol condenser are common equipment, they are used for mixed esterification of materials and recovery of methanol vapor; the double water absorber is used for partially absorbing the moisture produced in the reaction process to make the reaction toward Carry out in the positive direction to reduce the amount of methanol. It can realize the whole process of continuous water absorption, continuous drying and reduction of dehydrating agent; the material booster pump and methanol booster pump are mainly used for conveying and boosting; the high-efficiency cross-linking mixer is mainly for The equipment for intermolecular forced cross-linking of raw material oil, methanol and catalyst is an advanced equipment imported from abroad. The reciprocating shearing can reach more than 100,000 times per minute. Under the action of certain pressure, forced cross-linking force and high-speed shearing force, the contact rate between reactant molecules is greatly increased, and the reaction speed is significantly accelerated, thereby improving productivity; The function of the pressure injection head is to spray the cross-linked material into the reaction kettle evenly, and at the same time, it uses the flow-limiting effect to increase the material pressure in the cross-linking machine. This unique method is very beneficial to increase the reaction speed.

The utility model adopts a double water absorber to remove the water in the esterification reaction of biodiesel synthesis, so that the reaction proceeds in the positive direction so as to reduce the amount of methanol. Forced cross-linking among the three improves the miscibility between the three, thereby better solving the problems existing in the prior art.

Further illustrate the technical scheme of the utility model below in conjunction with accompanying drawing.

Description of drawings

Accompanying drawing is the technological process schematic diagram of the present utility model.

Detailed ways

An embodiment of the utility model is shown in the accompanying drawings, and it is composed of an esterification kettle 1, a methanol condenser 2, a double water absorber 3, a methanol storage tank 4, a high-efficiency cross-linking mixer 7, etc., forming a series circuit. A methanol booster pump 5 is provided between the high-efficiency cross-linking mixer 7, and a material booster pump 6 is provided between the esterification kettle 1 and the high-efficiency cross-linking mixer 7. A booster spray head 8 is arranged on the pipeline of the joint mixer 7 .

Add the raw material oil, methanol and catalyst to the esterification kettle 1 according to a certain ratio to raise the temperature. The methanol vapor is refluxed through the methanol condenser 2 and then enters the double water absorber 3 for dehydration. The dehydrating agent must have no adverse effect on methanol and has strong water absorption. substance. For example, after the first absorption column of the double water absorber 3 absorbs, the second absorption column can be used to work continuously, and the first absorption column can be heated and reduced in a vacuum state. The continuous reduction of the dehydrating agent is carried out simultaneously by vacuum and heating, which is also the ingenious design of this device. When part of the methanol is put into the methanol storage tank 4, the feed booster pump 6, the methanol booster pump 5 and the high-efficiency cross-linking mixer 7 are started simultaneously. Adjust the methanol and raw oil flow valves to ensure a certain pressure in the high-efficiency crosslinking mixer. After adopting this equipment, the amount of methanol, the conversion rate of crude oil, and the production time all have great changes. The specific comparison is as follows:

Before technical transformation After technical improvement Methanol consumption (kg/ton) 180 130 Production time (hours/pot) 3 2 Esterification rate (%) 85 95

Claims (2)

1, a kind of equipment of processing biological diesel-oil, it is characterized in that forming the tandem process loop by esterifying kettle, methanol condenser, duplex water aspirator, methyl alcohol storage tank, efficient crosslinked mixing tank, between methyl alcohol storage tank and efficient crosslinked mixing tank, be provided with the methyl alcohol topping-up pump, be provided with the material topping-up pump in addition between the efficient crosslinked mixing tank from esterifying kettle.

2, the equipment of processing biological diesel-oil according to claim 1 is characterized in that on the pipeline from efficient crosslinked mixing tank in esterifying kettle the boosting jet head being set.

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