CN105694999B - High-quality low-sulfur-content biodiesel production equipment and technology - Google Patents

Abstract

A high-quality low-sulfur biodiesel production equipment, the aeration reaction tank is connected to the salt water supply source and the raw oil supply source through pipelines; the aeration reaction tank is connected to the butterfly centrifuge through the pipeline; the butterfly centrifuge passes through The pipeline is connected to the ultrasonic box; the ultrasonic box is connected to the oil-water separation tank through the pipeline; the ultrasonic box is also connected to the clean water source through the pipeline; the oil-water separation tank is connected to the atmospheric distillation tower through the pipeline; the atmospheric distillation tower is connected to the raw material temporary storage tank through the pipeline The raw material temporary storage tank is connected to the esterification reactor through a pipeline; the upper part of the raw material temporary storage tank and the atmospheric distillation tower is connected through a pipeline to form a low boiling point substance outlet; the esterification reactor is connected to the vacuum distillation tower through a pipeline.

Description

Production equipment and process of high-quality low-sulfur biodiesel

technical field

The invention relates to the field of biomass energy, in particular to a production process and equipment for low-sulfur biodiesel.

Background technique

Biodiesel is a kind of green energy with low sulfur content. The product obtained by conventional production process can reach the National IV standard. In recent years, with the increase of diesel consumption and the upgrading of vehicle diesel, the production of high-quality and high-brand biodiesel Diesel has become inevitable, and most petrochemical diesel manufacturers have upgraded their standards to National V, while the existing biodiesel production process can no longer meet the requirements of National V standards, and the existing desulfurization technologies are all developed for petrochemical diesel, which cannot be used for biodiesel. Diesel desulfurization.

Contents of the invention

The present invention aims at the technical defects mentioned in the background technology, one is to provide a kind of production equipment of low-sulfur biodiesel, and the other is to provide a kind of technology of using this equipment to produce low-sulfur biodiesel, and make the biodiesel product The sulfur content is lower than the national V standard.

The technical scheme adopted in the present invention is:

A high-quality low-sulfur biodiesel production equipment, including an aeration reaction tank, a butterfly centrifuge, an ultrasonic box, an oil-water separation tank, an atmospheric distillation tower, a raw material temporary storage tank, an esterification reactor, and a vacuum distillation tower; in:

The aeration reaction tank is respectively connected to the salt water supply source and the raw material oil supply source through pipelines, and the matching salt water feed pump and raw oil feed pump are respectively installed on the pipelines;

The aeration reaction tank is connected to the butterfly centrifuge through a pipeline, and the first oil-water mixture delivery pump is installed on the pipeline;

The butterfly centrifuge is connected to the ultrasonic box through pipelines;

The ultrasonic box is connected to the oil-water separation tank through a pipeline, and a second oil-water mixture delivery pump is installed on the pipeline; the ultrasonic box is also connected to a clean water source through a pipeline, and a clean water feed pump is installed on the pipeline;

The oil-water separation tank is connected to the atmospheric distillation tower through a pipeline, and a raw oil pump is installed on the pipeline;

The atmospheric distillation tower is connected to the raw material temporary storage tank through pipelines;

The raw material temporary storage tank is connected to the esterification reactor through a pipeline, and a raw material delivery pump is installed on the pipeline; the raw material temporary storage tank and the upper part of the atmospheric distillation tower are connected through a pipeline to form an outlet for low boiling point substances;

The esterification reactor is connected with the vacuum distillation tower through a pipeline, and a crude biodiesel delivery pump is installed on the pipeline.

The aeration reaction tank is a corridor structure, and an aeration plate is arranged at the bottom; the oil-water mass ratio in the reactor is 2:1-1:2, and the concentration of salt water is 0.1%-1%. The water ratio is 2:1-8:1.

In the ultrasound box, the frequency of ultrasound is set to 5-15MHz.

A production process of high-quality low-sulfur biodiesel is carried out according to the following steps.

a. Turn on the raw material oil feeding pump and the salt water feeding pump to feed liquid into the aeration reaction tank, and the raw material oil stays in the aeration reaction tank for 10-40 minutes, continuously feeding and continuously extracting;

b. Turn on the first oil-water mixture delivery pump to continuously feed the butterfly centrifuge, discharge the waste liquid to the sewage treatment plant, and recover the primary desulfurization raw material oil to the next desulfurization process;

c. Feed the primary desulfurization raw material oil into the ultrasonic tank, turn on the clean water feed pump, and turn on the ultrasonic wave, and transport it to the oil-water separation tank through the second oil-water mixture delivery pump, and stand and separate to obtain the secondary desulfurization raw material oil;

d. The raw material oil pump continuously pumps the secondary desulfurization raw material oil into the atmospheric distillation tower, and controls the production temperature: the production fluid less than 120°C is extracted through the outlet of low boiling point substances to the boiler in the plant for combustion, and the production fluid greater than 120°C It is the tertiary desulfurization raw material oil, which is produced to the raw material temporary storage tank for temporary storage, and the high-viscosity substance discharged from the bottom of the atmospheric distillation tower is vegetable asphalt;

e. Turn on the raw material delivery pump, pump the tertiary desulfurization raw material oil into the esterification reactor for esterification reaction, after the reaction is completed, the waste liquid is discharged to the sewage treatment plant, and the crude biodiesel obtained from the reaction is transported to the vacuum through the crude biodiesel delivery pump The rectification tower carries out vacuum rectification;

f. The light components with relatively high sulfur content extracted from the top of the vacuum distillation tower are extracted from the high-sulfur material outlet to the boiler in the plant for combustion, high-quality low-sulfur biodiesel is extracted from the high-quality biodiesel outlet, and the plant asphalt at the bottom of the tower is extracted out.

The first-stage desulfurized raw oil and clean water enter the ultrasonic box, the ratio of oil to water is 2:1-1:2, and the first-stage desulfurized oil stays in the ultrasonic box for 10-30 minutes.

The temperature at the top of the vacuum distillation tower is 90-100°C.

The present invention has the following characteristics:

1. This method is suitable for raw material oils from multiple sources or mixed raw oils from multiple sources. The oil produced by processing biodiesel raw material oils with this method has low sulfur content and small color number;

2. The whole process comprehensively utilizes raw material oil to obtain two products of high-quality oil and plant asphalt, and the light components with high sulfur content can be fully utilized as the heat source of the plant area;

3. The yield of this method reaches more than 90%, which is a practical and effective method to ensure the yield and improve the product standard in the early stage;

4. This method adopts the desulfurization method at both ends, which not only ensures the removal of sulfur at the source, but also ensures the removal of sulfur mixed in the process;

5. The total equipment investment of this method is small, and it is suitable for technical upgrading of biodiesel enterprises.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

In the figure: raw oil feed pump 1, salt water feed pump 2, aeration reaction tank 3, aeration plate 4, first oil-water mixture delivery pump 5, butterfly centrifuge 6, waste liquid 7, clean water feed Pump 8, ultrasonic tank 9, second oil-water mixture delivery pump 10, oil-water separation tank 11, raw oil pump 12, vegetable asphalt 13, atmospheric distillation tower 14, raw material temporary storage tank 15, raw material delivery pump 16, esterification reactor 17. Waste liquid discharge 18, crude biodiesel delivery pump 19, vacuum distillation tower 20, high-quality biodiesel outlet 21, high-sulfur substance outlet 22, plant asphalt 23, and low-boiling point substance outlet 24.

detailed description

The present invention will be described in detail below through specific examples.

Referring to accompanying drawing 1, the biodiesel production equipment disclosed in the present invention is mainly for producing a high-quality low-sulfur biodiesel. It mainly includes raw material oil feed pump 1, salt water feed pump 2, aeration reaction tank 3, aeration plate 4, first oil-water mixture delivery pump 5, butterfly centrifuge 6, waste liquid 7, clean water feed pump 8. Ultrasonic box 9, second oil-water mixture delivery pump 10, oil-water separation tank 11, raw material oil pump 12, first plant asphalt outlet 13, atmospheric distillation tower 14, raw material temporary storage tank 15, raw material delivery pump 16, ester Chemical reactor 17, waste liquid discharge port 18, crude biodiesel delivery pump 19, vacuum rectification tower 20, high-quality biodiesel outlet 21, high-sulfur substance outlet 22, second plant asphalt discharge port 23, low-boiling point substance outlet twenty four.

The aeration reaction tank is respectively connected to the salt water supply source and the raw material oil supply source through pipelines, and the matching salt water feed pump and raw oil feed pump are respectively installed on the pipelines. The aeration reaction tank is a corridor structure, and an aeration plate is arranged at the bottom; the oil-water mass ratio in the reactor is 2:1-1:2, and the concentration of salt water is 0.1%-1%. The water ratio is 2:1-8:1.

The aeration reaction tank is connected to the butterfly centrifuge through a pipeline, and the first oil-water mixture delivery pump is installed on the pipeline.

The butterfly centrifuge is connected to the ultrasonic box through pipes; the waste liquid in the butterfly centrifuge is discharged from the sewage outlet at the bottom.

The ultrasonic box is connected with the oil-water separation tank through a pipeline, and the second oil-water mixture delivery pump is installed on the pipeline at this place; the ultrasonic box is also connected with the clean water source through a pipeline, and a clean water feed pump is installed on the pipeline at this place; in the ultrasonic box, the ultrasonic The frequency is set to 5-15MHz.

The oil-water separation tank is connected to the atmospheric distillation tower through a pipeline, and the raw material oil pump is installed on the pipeline; the atmospheric distillation tower is connected to the raw material temporary storage tank through a pipeline, and the bottom of the atmospheric distillation tower is the first plant asphalt outlet.

The raw material temporary storage tank is connected to the esterification reactor through a pipeline, and a raw material delivery pump is installed on the pipeline; the raw material temporary storage tank and the upper part of the atmospheric distillation tower are connected through a pipeline to form an outlet for low boiling point substances.

The esterification reactor is connected with the vacuum distillation tower through a pipeline, and a crude biodiesel delivery pump is installed on the pipeline. The bottom of the esterification reactor is provided with a waste liquid discharge port. The upper part of the vacuum distillation tower is the outlet of high-quality biodiesel, the top is the outlet of high-sulfur substances, and the bottom is the outlet of the second plant asphalt.

The process for preparing high-quality low-sulfur biodiesel by using the above-mentioned equipment is carried out according to the following steps.

a. Turn on the raw oil feed pump and salt water feed pump to feed liquid into the aeration reaction tank. The aeration reactor is a corridor type. The ratio of oil to water in the reaction tank is 2:1~1:2, and the concentration of salt water is 0.1%. ～1%, open the aeration plate, the gas-water ratio is 2:1～8:1, the raw oil stays in the aeration reaction tank for 10min～40min to continuously feed and continuously extract.

b. Turn on the oil-water mixture delivery pump to continuously feed the butterfly centrifuge, discharge the waste liquid to the sewage treatment plant, and recover the first-stage desulfurization raw material oil to the next desulfurization process.

c. Feed the primary desulfurization feedstock oil to the ultrasonic box, turn on the clean water feed pump, and turn on the ultrasonic wave. The oil-water ratio is 2:1~1:2, and the frequency is set at 5~15MHz, taking cavitation sound as a reference ( remove the surfactant), the first-stage desulfurization oil stays in the ultrasonic box for 10-30 minutes, and is transported to the oil-water separation tank by the oil-water mixture delivery pump for static separation to obtain the second-stage desulfurization raw material oil.

d. The raw material oil pump continuously pumps the secondary desulfurization raw material oil into the atmospheric distillation tower, and controls the production temperature. The production fluid less than 120°C is extracted through the outlet of low-boiling point substances to the boiler in the plant for combustion, and the production fluid greater than 120°C The tertiary desulfurization raw material oil is extracted to the raw material temporary storage tank for temporary storage, and the first vegetable asphalt outlet at the bottom of the tower produces high-viscosity vegetable asphalt.

e. Turn on the raw material delivery pump, pump the tertiary desulfurization raw material oil into the esterification reactor for esterification reaction, after the reaction is completed, the waste liquid is discharged to the sewage treatment plant, and the crude biodiesel obtained from the reaction is transported to the vacuum through the crude biodiesel delivery pump The rectification tower carries out vacuum rectification.

f. Control the temperature at the top of the vacuum distillation tower to 90-100°C. The light components with relatively high sulfur content extracted from the top of the tower are extracted from the high-sulfur material outlet to the boiler in the factory for combustion. High-quality low-sulfur biodiesel is processed by high-quality biological The diesel oil is produced at the outlet, and the plant asphalt is produced at the second plant asphalt outlet at the bottom of the tower.

Example 1

Waste oil (sulfur content is 350mg/Kg) 10 tons, pumped into the aeration reaction tank 3, the oil-water ratio is 1:1, the concentration of salt water is 0.5%, the aeration plate 4 is opened, the air-water ratio is 5:1, the waste oil Stay in the aeration reaction tank 3 for 20 minutes, centrifuge after the aeration reaction, remove a large amount of sulfur-containing impurities, proteins, colloids, etc. in the waste oil, the centrifuge discharge directly enters the ultrasonic tank 9, and open the clear water feed pump 8 at the same time, The oil-water ratio is 1:1, and the ultrasonic frequency is turned on to 10MHz. The oil-water mixture generates free radicals and annihilates bubbles under the action of ultrasonic cavitation. Remove it into the waste water, stand still and separate the water to obtain the secondary desulfurization raw material oil, the raw material oil pump 12 continuously pumps the secondary desulfurization raw material oil into the atmospheric distillation tower 14, control the production temperature, and the production liquid less than 120 ° C is passed through the low boiling point The material outlet 24 is extracted to the boiler in the factory area for combustion, and the extraction of light components ensures the removal of small molecular sulfur-containing organic matter. The production liquid above 120 °C is the third-stage desulfurization raw material oil, which is extracted to the raw material temporary storage tank 15 for temporary storage. The high-viscosity substance at the bottom of the tower is vegetable asphalt 13. Turn on the raw material delivery pump 16, pump the tertiary desulfurization raw material oil into the esterification reactor 17 to carry out the esterification reaction, after the reaction is completed, the waste liquid is discharged 18 to the sewage treatment plant, and the crude biodiesel obtained from the reaction is transported by the crude biodiesel delivery pump 19 To the vacuum rectification tower 20 for vacuum rectification, the temperature at the top of the vacuum rectification tower 20 is controlled at 97°C, and the light components with relatively high sulfur content are extracted from the top of the tower through the high-sulfur substance outlet 22 to be burned in the boiler in the factory area. Plant asphalt 23 is extracted, and high-quality low-sulfur biodiesel is extracted through high-quality biodiesel outlet 21. The product quality meets the National V standard, and the sulfur content is less than 10 mg/Kg.

Example 2

10 tons of swill oil (sulfur content is 300mg/Kg), pumped into the aeration reaction tank 3, the oil-water ratio is 1:2, the concentration of salt water is 0.3%, the aeration plate 4 is opened, the air-water ratio is 3:1, and the swill oil Stay in the aeration reaction tank 3 for 40 minutes, centrifuge after the aeration reaction, remove a large amount of sulfur-containing impurities, proteins, colloids, etc. in the waste oil, and the centrifuge discharge directly enters the ultrasonic tank 9, and simultaneously turns on the clear water feed pump 8, The oil-water ratio is 2:1, and the ultrasonic frequency is turned on to 6MHz. Under the action of ultrasonic cavitation, the oil-water mixture generates free radicals and annihilates bubbles. Remove it into the waste water, stand still and separate the water to obtain the secondary desulfurization raw material oil, the raw material oil pump 12 continuously pumps the secondary desulfurization raw material oil into the atmospheric distillation tower 14, control the production temperature, and the production liquid less than 120 ° C is passed through the low boiling point The material outlet 24 is extracted to the boiler in the factory area for combustion, and the extraction of light components ensures the removal of small molecular sulfur-containing organic matter. The production liquid above 120 °C is the third-stage desulfurization raw material oil, which is extracted to the raw material temporary storage tank 15 for temporary storage. The high-viscosity substance at the bottom of the tower is vegetable asphalt 13. Turn on the raw material delivery pump 16, pump the tertiary desulfurization raw material oil into the esterification reactor 17 to carry out the esterification reaction, after the reaction is completed, the waste liquid is discharged 18 to the sewage treatment plant, and the crude biodiesel obtained from the reaction is transported by the crude biodiesel delivery pump 19 To the vacuum rectification tower 20 for vacuum rectification, the temperature at the top of the vacuum rectification tower 20 is controlled at 95°C, and the light components with relatively high sulfur content are extracted from the top of the tower through the outlet 22 of high-sulfur substances to the boiler in the plant for combustion, and the bottom of the tower Plant asphalt 23 is extracted, and high-quality low-sulfur biodiesel is extracted through high-quality biodiesel outlet 21. The product quality meets the National V standard, and the sulfur content is less than 10 mg/Kg.

Claims (6)

1. a kind of production equipment of high-quality low-sulfur decomposing biological diesel oil, it is characterised in that including aerated reaction pond, butterfly centrifugal Machine, ultrasonic tank, gun barrel, atmospheric distillation tower, raw material temporary storage tank, esterifier and vacuum tower；Wherein：

Aerated reaction pond is connected with saline solution source of supply and raw oil source of supply respectively by pipeline, is respectively provided with this on pipeline The saline solution feed pump for matching and raw oil feed pump；

Aerated reaction pond is connected with butterfly centrifugal machine by pipeline, and the first oil-water mixture delivery pump is housed on pipeline at this；

Butterfly centrifugal machine is connected with ultrasonic tank by pipeline；

Ultrasonic tank is connected with gun barrel by pipeline, and the second oil-water mixture delivery pump is housed on pipeline at this；It is described Ultrasonic tank is also connected with clear water source by pipeline, and clear water feed pump is housed on pipeline at this；

Gun barrel is connected with atmospheric distillation tower by pipeline, and raw oil pump is housed on pipeline at this；

Atmospheric distillation tower is connected with raw material temporary storage tank by pipeline；

Raw material temporary storage tank is connected with esterifier by pipeline, and feedstock transportation pump is housed on pipeline at this；Raw material temporary storage tank and The top of atmospheric distillation tower is connected by pipeline, forms low-boiling point material outlet；

Esterifier is connected with vacuum tower by pipeline, and coarse biodiesel delivery pump is housed on pipeline at this.

2. the production equipment of high-quality low-sulfur decomposing biological diesel oil according to claim 1, it is characterised in that the aeration is anti- Ying Chiwei gallery type structures, its bottom is provided with aeration board；In reactor, profit mass ratio is 2:1-1:2, Sal water concentration is 0.1%-1%；The gas-water ratio of the aeration board is 2：1-8：1.

3. the production equipment of high-quality low-sulfur decomposing biological diesel oil according to claim 1, it is characterised in that the ultrasound wave In case, the frequency setting of ultrasound wave is 5-15MHz.

4. a kind of production technology of high-quality low-sulfur decomposing biological diesel oil, it is characterised in that follow the steps below：

, to aerated reaction pond feed liquor, raw oil is stopped in aerated reaction pond for a, unlatching raw oil feed pump, saline solution feed pump 10min~40min, continuous feed are continuous to produce；

B, the first oil-water mixture delivery pump of unlatching, continuously feed to butterfly centrifugal machine, discharging of waste liquid to sewage treatment plant, one-level Desulfurization material oil is produced to next step desulfurization process；

C, first grade desulfurizing raw oil are fed to ultrasonic tank, are opened clear water feed pump, and are opened ultrasound wave, the second oil mixing with water of Jing Liquid delivery pump is delivered to gun barrel, and standing separation obtains two-grade desulfurizing raw oil；

D, raw oil pump are continuously pumped into two-grade desulfurizing raw oil in atmospheric distillation tower, control extraction temperature：Less than 120 DEG C adopt Go out liquid Jing low-boiling point materials outlet extraction to plant area's boiler combustion, the Produced Liquid more than 120 DEG C is three-level desulfurization material oil, is produced Temporary to raw material temporary storage tank, the high-viscosity material that air-distillation bottom of towe is discharged is plant asphalt；

E, unlatching feedstock transportation pump, three-level desulfurization material oil pump are entered and carry out in esterifier esterification, after the completion of reaction, To sewage treatment plant, reaction gained coarse biodiesel Jing coarse biodiesel delivery pumps are delivered to vacuum rectifying tower to be carried out discharging of waste liquid Rectification under vacuum；

The high sulphur content material outlet of f, higher light component Jing of vacuum tower overhead extraction sulfur-bearing is produced to plant area's boiler combustion, Gao Pin The outlet extraction of matter low-sulfur decomposing biological diesel oil Jing high-quality biologicals diesel oil, the extraction of bottom of towe plant asphalt.

5. the production technology of high-quality low-sulfur decomposing biological diesel oil according to claim 4, it is characterised in that first grade desulfurizing is former Material oil and clear water are entered in ultrasonic tank, and its profit mass ratio is 2:1-1:2, first grade desulfurizing oil is stopped in ultrasonic tank 10min~30min.

6. the production technology of high-quality low-sulfur decomposing biological diesel oil according to claim 4, it is characterised in that vacuum rectifying tower Tower top temperature 90-100 DEG C.