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A kind of refining method of biodiesel

A biodiesel and glycerin technology, which is applied in the preparation of liquid hydrocarbon mixtures, biological raw materials, biofuels, etc., can solve the problem of high energy consumption in the biodiesel production process

Active Publication Date: 2015-09-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, when the alcohol recovery tower is used for monohydric alcohol distillation and the ester distillation tower is used for distillation of mixed esters, the respective cold sources or heat sources are used for heat exchange. Therefore, the energy consumption of the biodiesel production process is relatively high.

Method used

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  • A kind of refining method of biodiesel

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0020] According to another specific embodiment of the present invention, if the crude biodiesel product after the separation of alcohol after the ester distillation tower overhead gas is condensed and taken heat, the heat outlet temperature is not enough to meet the temperature requirements of the alcohol recovery tower tank (that is, cannot meet the heat requirements for the heat of vaporization of alcohol recovery), the temperature of the heat outlet can be 100-300°C, at this time, according to the temperature of the heat outlet, the crude biodiesel product after the heat exchange needs to be separated from the alcohol The heat flow enters the reboiler of the alcohol recovery tower tank for supplementary heat exchange to meet the temperature requirements of the alcohol recovery tower tank.

[0021] According to the present invention, the method of condensing the top gas of the ester distillation tower and taking heat is usually carried out in a condenser, and the top gas of ...

Embodiment approach

[0028] According to the present invention, if figure 1 As shown, according to a preferred embodiment of the present invention, the refining method of the biodiesel comprises that the biodiesel crude product 6 is sent into the alcohol recovery tower 1 successively to recover the monohydric alcohol, and the temperature of the bottom of the alcohol recovery tower is The temperature is 80-150°C, the pressure is 0.1-0.5MPa, and the top reflux ratio is 0.1-10:1; the monohydric alcohol 9 is obtained from the top of the alcohol recovery tower 1, and the separated alcohol is obtained from the bottom of the alcohol recovery tower 1. Diesel oil crude product, the biodiesel crude product after at least partly separating alcohol, that is, the cold stream 8 before the heat exchange exchanges heat with the overhead gas obtained from the top of the ester distillation tower 4 (the heat exchange is carried out in the condenser 5 ), the crude biodiesel product after heat exchange is at least par...

Embodiment 1

[0035] This example is used to illustrate the refining method of biodiesel provided by the present invention.

[0036] Taking the crude biodiesel product (with a flow rate of 1000kg / h) as an example, the composition of the crude biodiesel product is listed in Table 1 below.

[0037] Such as figure 1 As shown, the biodiesel crude product is sent into the methanol recovery tower 1, the operating pressure of the methanol recovery tower 1 is normal pressure (0.11MPa), the temperature of the tower bottom is 89°C, and the outlet temperature of the tower bottom reboiler is 115°C, the top reflux ratio is 1:1. Obtain the recovered methanol from the top of the methanol recovery tower 1, obtain the crude biodiesel product after the separation of methanol from the bottom of the methanol recovery tower 1, send the crude biodiesel product 7 after the separation of methanol into the stratified tank 2, and Stand still at 50°C for 2 hours, get glycerin 11 from the lower outlet of stratified ...

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Abstract

The invention discloses a refining method of biodiesel. The method comprises the following steps: sequentially separating monohydric alcohols, glycerol and light components in a biodiesel crude product to obtain crude ester and refining the crude ester, wherein the method for separating the monohydric alcohols in the biodiesel crude product comprises the steps of sending the biodiesel crude product into an alcohol recovery tower to perform distillation, thereby obtaining the monohydric alcohols from the tower top and obtaining the biodiesel crude product from a tower kettle after separation of the alcohols; the method for refining the crude ester comprises the steps of sending the crude ester into an ester distillation tower to perform distillation, and condensing tower top gas obtained from the tower top to obtain the biodiesel, wherein heat which is taken out during condensation of the tower top gas obtained from the tower top of the ester distillation tower is taken as at least part of heat source of the tower kettle of the alcohol recovery tower by heat exchange. According to the method, heat of the alcohol recovery tower and the heat of the ester distillation tower are coupled, the heat source and a cold source are simultaneously saved, and the energy consumption in a biodiesel production process flow is further effectively reduced.

Description

technical field [0001] The invention relates to a method for refining biodiesel. Background technique [0002] As a potential substitute for diesel energy, biodiesel has received more and more attention in recent years. Biodiesel has the advantages of almost no sulfur and aromatics, high cetane number, good lubricity, and convenient storage and transportation. It can be blended with petrochemical diesel in a certain proportion to reduce fuel consumption and toxic gas emissions. [0003] Biodiesel can be obtained through esterification and transesterification of animal and vegetable oils, and its main component is monoalkyl fatty acid esters. In addition, it may also contain allowable amounts of monoglycerides, diglycerides and other substances. The transesterification method can be divided into chemical method and biological enzymatic method. Among them, the chemical method of transesterification is currently the main method for industrial production of biodiesel. For examp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G3/00
CPCY02E50/10Y02P30/20
Inventor 杨克勇江雨生范瑛琦王皓杜泽学王海京
Owner CHINA PETROLEUM & CHEM CORP