Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of low-sulfur biodiesel

A technology of biodiesel and glycerol, which is applied to the preparation of low-sulfur biodiesel and the field of low-sulfur biodiesel, can solve the problems of high rectification cost, excessive waste water, and large equipment investment, so as to reduce the production of soap and avoid foaming. , the effect of reducing costs

Active Publication Date: 2019-04-05
ZHEJIANG UNIV OF TECH
View PDF13 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above methods can quickly reduce the acid, and the acid value can be reduced to below 0.5, but there is still a small amount of fatty acid that has not been converted, thereby producing soap during the subsequent transesterification, which affects the stratification and recovery of crude glycerin; Acid reduction requires the introduction of excess glycerin. After the completion of glycerol esterification, excess glycerin is still dissolved in the oil ester, which affects the subsequent transesterification reaction.
In addition, the above processes and devices do not consider the removal of sulfur compounds
[0005] Chinese patent CN 106336919 A ​​discloses a new method for biodiesel desulfurization, which removes sulfur compounds in biodiesel through two-stage high-vacuum rectification. Distillation desulfurization requires high separation requirements for the rectification tower, and the cost of rectification is relatively high; Chinese patent CN 105694999 B discloses a production equipment and process for high-quality low-sulfur biodiesel, which consists of aeration, water washing, ultrasonic , Distillation three-stage desulfurization and esterification, rectification and cutting of sulfur-containing light components to obtain low-sulfur biodiesel, the process is more complicated, equipment investment is larger, and more waste water is generated

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of low-sulfur biodiesel
  • A kind of preparation method of low-sulfur biodiesel
  • A kind of preparation method of low-sulfur biodiesel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The crude biodiesel raw material used in embodiment 1 is waste oil (waste oil), and its fatty acid methyl ester content distribution is as shown in table 1:

[0030] Table 1 Contents of fatty acid methyl esters in biodiesel prepared from waste oil

[0031]

[0032] Such as figure 1 As shown, heat exchange between the raw oil and the oil after flash distillation 4 1, then preheat 2 to 240°C, add glycerin for glycerin esterification 3 (add fresh glycerin in the first production, add back to use glycerin later), glyceride The temperature of compound 3 is controlled at 240°C, the reaction time is 3 hours, and then flashing 4 is carried out (the steamed product of flashing 4 can be reused for the next glycerol esterification reaction), the top temperature of flashing 4 is 191°C, and the operating absolute pressure is 500Pa, heat exchange between oil after flashing 4 and raw oil 1 recover heat and then cool 5 to 60°C, refuel with 40% methanol and 1% KOH for transesterific...

Embodiment 2

[0036] The raw material of crude glycerol used in Example 2 is the crude glycerin obtained by transesterification and sedimentation after transesterification in the process of glycerol esterification to prepare biodiesel. Take 60.1 g of crude glycerol, and directly rectify it at an absolute pressure of 500 Pa and a top gas phase temperature of 161°C without any treatment. The composition and distillation data are shown in Table 3. It can be seen from Table 3 that the crude glycerol obtained by this process can be directly distilled without the traditional acidification and soap removal process, and the recovery rate of glycerin has reached 97.4%, which avoids the problem of acidic wastewater produced by acidification in the recovery process of glycerin.

[0037] Table 3 raw material composition and rectification data

[0038]

[0039]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
acid valueaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing low-sulfur biodiesel. The method comprises the following steps: heat exchange, preheating, glycerin esterification reaction, flash evaporation, cooling, transesterification reaction, dealcoholization, sedimentation, and methyl ester refining of raw oil. The standard low-sulfur biodiesel is obtained by distillation; in the heat exchange process, the raw material oil exchanges heat with the flashed oil to recover part of the heat, and the glycerin and fatty acids in the flash distillate are reused for glycerol esterification; the dealcoholization process removes Remove the methanol in the system after the transesterification reaction, and the refined methanol recovered by methanol rectification can be reused for the transesterification reaction; the crude glycerin produced in the sedimentation process can be directly rectified to obtain refined glycerin without treatment, and the refined glycerin can be reused for glycerides reaction. The invention is clean and efficient, has no sulfuric acid wastewater, wide application range, short reaction time, complete acid reduction, high oil conversion rate, heat recycling, low energy consumption, unreacted methanol and by-product glycerin recycling, low production cost, suitable for Industrial production. The invention can stably produce high-grade low-sulfur biodiesel whose sulfur content is less than 10ppm and meets EU standards.

Description

technical field [0001] The invention belongs to the technical field of biodiesel preparation, in particular to a method for preparing low-sulfur biodiesel, and is especially suitable for clean and efficient preparation of low-sulfur biodiesel from waste oil. Background technique [0002] Grease is mainly composed of fatty acids and neutral oils, and an important process in the production of biodiesel is acid reduction. Traditionally, acid-catalyzed esterification is used for acid reduction, but this method will produce waste acid water that pollutes the environment, is difficult to handle, and has high processing costs. [0003] As an efficient method of acid reduction, glycerol esterification is more thorough in acid reduction, and no waste acid water is generated. Chinese patent CN105623861A discloses a glycerol esterification reaction device. The device has a simple structure, reasonable design, low energy consumption, and the acid value of oil quickly drops below 0.5mgK...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C11C3/06C11C3/10C10L1/02
CPCC10L1/02C11C3/06C11C3/10C10L1/026C11C3/003C11C1/08C11C1/10C11C3/02Y02E50/10C10L2200/0263C10L2200/0476C10L2270/026C10L2290/06C10L2290/08
Inventor 聂勇夏凡解庆龙卢美贞梁晓江宿颜彬计建炳
Owner ZHEJIANG UNIV OF TECH