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Method and system for preparing biodiesel by variable temperature-pressure variable continuous method

A technology of biodiesel and continuous method, which is applied in the fields of biofuel, petroleum industry, fatty acid esterification, etc. It can solve the problems that the device cannot run stably for a long period of time, and the high acid value of biodiesel is difficult to achieve, so as to reduce the acid value and high The effect of product yield and high raw material conversion rate

Active Publication Date: 2022-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One of the purposes of the present invention is to overcome the method of the prior art when preheating the raw material for preparing biodiesel, which will cause deposits to accumulate in the high-pressure heater, so that the device cannot run stably for a long period of time and the acidity of the obtained biodiesel The defect that the value is relatively high and difficult to meet the national standard

Method used

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  • Method and system for preparing biodiesel by variable temperature-pressure variable continuous method
  • Method and system for preparing biodiesel by variable temperature-pressure variable continuous method

Examples

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Effect test

Embodiment 1

[0113] Waste oil and methanol are continuously supplied to the first tank reactor with stirring at a rate of 120 g / h and 31 g / h respectively, and the liquid hourly volume space velocity is 1 h -1, the temperature of the first tank reactor is 170 ° C, the pressure is 5Mpa, the first material after the reaction escapes from the upper part of the first tank reactor and enters the static tank for standing, and the obtained from the upper part of the static tank The material from which the precipitate has been removed enters the second tank reactor I with stirring, the temperature of the second tank reactor I is 250°C, the pressure is 5Mpa, and the liquid hourly volume space velocity is 1h -1 , adding methanol amount is 10 g / hour, and the material after the reaction is drawn from the top of the second tank reactor 1, enters the standing tank and leaves standstill, and the sediment and glycerin phase obtained from the standing tank top are removed The ester phase enters the second t...

Embodiment 2

[0119] Waste grease and methanol are continuously supplied to the first vertical tubular reactor at a rate of 600 g / h and 160 g / h respectively, and the liquid hourly volume space velocity is 1h -1 , the temperature of the first vertical tubular reactor is 160°C, and the pressure is 6Mpa, and the sediment in the first vertical tubular reactor relies on gravity to enter the deposition at the bottom of the first vertical tubular reactor in the collection tank. The first material escaping from the upper part of the first vertical tubular reactor enters the second vertical tubular reactor I, the temperature of the second vertical tubular reactor I is 260°C, the pressure is 6Mpa, and the liquid The hourly volume space velocity is 1h -1 , the added methanol amount is 25 g / hour, and the material after the reaction is drawn from the top of the second vertical tubular reactor 1 to enter the additional separation device to carry out the static separation of the ester phase and the glyce...

Embodiment 3

[0125] Waste oil and methanol are continuously supplied to the first tank reactor with stirring at a rate of 120 g / h and 33 g / h respectively, and the liquid hourly volume space velocity is 0.7h -1 , the temperature of the first tank reactor is 160 ° C, the pressure is 5.5Mpa, the first material after the reaction escapes from the upper part of the first tank reactor and enters the static tank for standing, and obtains from the upper part of the static tank The material from which the precipitate has been removed enters the second tank reactor I with stirring, the temperature of the second tank reactor I is 245°C, the pressure is 5Mpa, and the volume space velocity is 0.7h -1 , the amount of methanol added is 14 grams per hour, and the material after the reaction is drawn from the top of the second tank reactor 1, enters the static tank and leaves standstill, and the sediment and glycerol phase are removed from the static tank top obtained The ester phase enters the stirred sec...

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Abstract

The invention relates to the field of biodiesel preparation, and discloses a method and system for preparing biodiesel by a variable temperature-variable pressure continuous method. The method includes: directly introducing raw materials containing oil and alcohol into a first reactor for reaction, and the The first material is obtained from the upper part of the first reactor; the first material is introduced into at least two second reactors connected in series for reaction, and the second material is obtained from the upper part of the last second reactor. The method for preparing biodiesel by the variable temperature-variable pressure continuous method provided by the present invention can avoid entering the preheater by directly introducing the raw material containing oil and alcohol into the first reactor for reaction without passing through the conventional preheating reactor Preheating will cause deposits to accumulate in the high-pressure heater, making the device unable to run stably for a long period of time.

Description

technical field [0001] The invention relates to the field of biodiesel preparation, in particular to a method for preparing biodiesel by a variable temperature-variable pressure continuous method and a system for preparing biodiesel by a variable temperature-variable pressure continuous method. Background technique [0002] Biodiesel can be produced by transesterification of oil and methanol, which refers to the exchange of triglycerides with another alcohol (usually a low-carbon alcohol, such as C 1 -C 8 monohydric alcohol) reaction. Among the products of transesterification, fatty acid esters are biodiesel, monoglycerides, diglycerides, glycerin, alcohol and triglycerides are raw materials. The preparation methods of biodiesel can be divided into acid catalysis, base catalysis, enzyme catalysis and supercritical method. [0003] Disclosed in CN1412278A is a kind of acid catalysis method, the method for preparing biodiesel with high acid value waste animal and vegetable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11C3/04C11C3/10C10L1/02
CPCC10L1/02C11C3/04C11C3/10Y02E50/10
Inventor 王海京杜泽学高国强
Owner CHINA PETROLEUM & CHEM CORP
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