Method for extracting bio-oil from beer industrial waste

Abstract

The invention discloses a method for extracting bio-oil from beer industrial waste, which comprises the following steps: step 1, mixing brewer's grains and waste beer yeast collected from the beer industrial waste according to a mass ratio of 1: 0.5, and pressing into a cake-shaped sample; and 2, placing the sample in a fluidized bed reactor, taking nitrogen as fluidizing gas of the fluidized bed reactor, controlling the temperature of the fluidized bed reactor, heating from room temperature to 550-650 DEG C at a heating speed of 20 DEG C / min, keeping the temperature for 20 minutes, carrying out pyrolytic reaction, and finally cooling, condensing and collecting condensable gas generated in the heating and constant temperature stages to obtain the bio-oil. According to the method for extracting the bio-oil from the beer industrial waste, nutritional ingredients of the brewer's grains and the waste yeast in the beer industrial waste are fully utilized and are converted into the bio-oil with a relatively high additional value, so that the reduction of the two wastes is realized, the harm of the two wastes to the environment is reduced, and the treatment cost of the two wastes is reduced.

Description

Technical Field

[0001] This invention relates to a method for waste treatment and resource utilization, and more particularly to a method for extracting bio-oil from beer industry waste. Background Technology

[0002] Beer lees and spent brewer's yeast sludge are the most significant byproducts of beer production, with beer lees accounting for approximately 80% of total beer industry waste and spent yeast sludge for about 10%. Beer lees primarily consists of malt husks, unsaccharified malt, and insoluble macromolecular substances from adjuncts, with lignin, cellulose, and hemicellulose comprising over 90% of the total mass. It also contains trace elements such as calcium and phosphorus. Spent brewer's yeast refers to yeast that has been fermented and can no longer be used as a starter culture. Its main component is brewer's yeast, along with small amounts of malt husks, rice fragments, and hops. Spent brewer's yeast contains approximately 50% protein, 6-8% ribonucleic acid (RNA), 2% B vitamins, 1% glutamate, and various nutrients such as coenzyme A and amino acids. The increasing volume of beer lees and spent yeast makes resource utilization and pollution control urgent issues for the beer industry.

[0003] The main components of brewer's grains and spent brewer's yeast are similar to those of biomass, making them excellent raw materials for producing bio-oil. In light of this, the inventors conducted in-depth research, leading to this invention. Summary of the Invention

[0004] The purpose of this invention is to provide a method for extracting bio-oil from beer industry waste, making full use of the nutrients in beer lees and spent yeast in beer industry waste, transforming them into bio-oil with high added value, thereby reducing the volume of both types of waste, reducing their harm to the environment, and reducing the disposal costs of both types of waste.

[0005] To achieve the above objectives, the solution of the present invention is: A method for extracting bio-oil from beer industry waste includes the following steps: Step 1: First, mix the beer lees and beer yeast collected from beer industry waste at a mass ratio of 1:0.5 and press them into a cake-shaped sample. Step 2: Then, the sample is placed in a fluidized bed reactor, with nitrogen as the fluidizing gas. The temperature of the fluidized bed reactor is controlled and increased from room temperature to 550~650℃ at a heating rate of 20℃ / min. The temperature is held constant for 20 min to carry out the pyrolysis reaction. Finally, the condensable gas generated during the heating and holding stages is collected by cooling and condensation to obtain the bio-oil.

[0006] In step 1, the brewer's grains and spent brewer's yeast are mixed and pressed into cakes with a diameter and height of 10 mm. The moisture content of the pressed sample is less than 20%. wt %.

[0007] In step 2, the fluidized bed reactor is a programmable temperature-controlled fluidized bed with a diameter of φ60×900 mm.

[0008] In step 2, the flow rate of nitrogen gas is 850 mL / min.

[0009] After adopting the above technical solution, the method for extracting bio-oil from beer industry waste of the present invention has the following beneficial effects: 1. The method of this invention uses beer lees and waste brewer's yeast from beer industry waste for co-pyrolysis, making full use of the high organic matter content of beer lees and waste yeast. Compared with the bio-oil obtained from ordinary biomass pyrolysis, the bio-oil obtained has a higher calorific value, lower viscosity, and lower corrosivity. In addition, since the waste yeast itself has a sticky characteristic, it is easy to press and shape when mixed with beer lees, which is more conducive to the pyrolysis operation. At the same time, the whole extraction process is simple and easy to operate.

[0010] 2. This invention maximizes the energy utilization of beer lees and waste yeast from the beer industry, achieving clean and efficient resource utilization of beer industry waste, and realizing the goals of environmental protection, waste resource utilization, and sustainable development, which is of great significance to my country's sustainable economic construction. Detailed Implementation

[0011] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0012] Example 1 A method for extracting bio-oil from beer industry waste includes the following steps: Step 1: First, mix the beer lees and spent beer yeast collected from the beer industry waste at a mass ratio of 1:0.5, and press them into cakes with a diameter of φ10×10 mm. The resulting sample should have a moisture content of less than 20%. wt % Step 2: Then, take 60 g of sample and place it in a φ60×900 mm programmable temperature-controlled fluidized bed. Use nitrogen as the fluidizing gas in the fluidized bed reactor and control the flow rate of nitrogen to 850 mL / min. Increase the temperature from room temperature to 550℃ at a rate of 20℃ / min and hold it at the temperature for 20 min to carry out the pyrolysis reaction. Finally, collect the condensable gas produced during the heating and holding stages after cooling and condensation to obtain bio-oil.

[0013] The yield of the obtained bio-oil was 50.37%, with a higher heating value of 28.89 MJ / kg and a viscosity of 24.52 mm.2 / s, acid value 90.21 mg KOH / g.

[0014] Example 2 A method for extracting bio-oil from beer industry waste includes the following steps: Step 1: First, mix the beer lees and spent beer yeast collected from the beer industry waste at a mass ratio of 1:0.5, and press them into cakes with a diameter of φ10×10 mm. The resulting sample should have a moisture content of less than 20%. wt % Step 2: Then, take 60 g of sample and place it in a φ60×900 mm programmable temperature-controlled fluidized bed. Use nitrogen as the fluidizing gas in the fluidized bed reactor and control the flow rate of nitrogen to 850 mL / min. Increase the temperature from room temperature to 600℃ at a rate of 20℃ / min and hold it at the temperature for 20 min to carry out the pyrolysis reaction. Finally, collect the condensable gas produced during the heating and holding stages after cooling and condensation to obtain bio-oil.

[0015] The yield of the obtained bio-oil was 53.12%, with a higher heating value of 31.86 MJ / kg and a viscosity of 22.61 mm. 2 / s, acid value 80.32 mg KOH / g.

[0016] Example 3 A method for extracting bio-oil from beer industry waste includes the following steps: Step 1: First, mix the beer lees and spent beer yeast collected from the beer industry waste at a mass ratio of 1:0.5, and press them into cakes with a diameter of φ10×10 mm. The resulting sample should have a moisture content of less than 20%. wt % Step 2: Then, take 60 g of sample and place it in a φ60×900 mm programmable temperature-controlled fluidized bed. Use nitrogen as the fluidizing gas in the fluidized bed reactor and control the flow rate of nitrogen to 850 mL / min. Increase the temperature from room temperature to 650℃ at a rate of 20℃ / min and hold it at the temperature for 20 min to carry out the pyrolysis reaction. Finally, collect the condensable gas produced during the heating and holding stages after cooling and condensation to obtain bio-oil.

[0017] The yield of the obtained bio-oil was 51.69%, with a higher heating value of 29.93 MJ / kg and a viscosity of 23.46 mm. 2 / s, acid value 95.73 mg KOH / g.

[0018] The programmable temperature-controlled fluidized bed in this invention is a well-known device in the art.

[0019] The above embodiments are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A method for extracting bio-oil from beer industry waste, characterized in that: Includes the following steps: Step 1: First, mix the beer lees and waste beer yeast collected from the beer industry waste at a mass ratio of 1:0.5 and press them into a cake-shaped sample. Step 2: Then, the sample is placed in a fluidized bed reactor, with nitrogen as the fluidizing gas. The temperature of the fluidized bed reactor is controlled and increased from room temperature to 550~650℃ at a heating rate of 20℃ / min. The temperature is held constant for 20 min to carry out the pyrolysis reaction. Finally, the condensable gas generated during the heating and holding stages is collected by cooling and condensation to obtain the bio-oil.

2. The method for extracting bio-oil from beer industry waste according to claim 1, characterized in that: In step 1, the brewer's grains and waste brewer's yeast are mixed and pressed into cakes with a diameter and height of 10 mm. The moisture content of the pressed sample is less than 20%. wt %.

3. The method for extracting bio-oil from beer industry waste according to claim 1, characterized in that: In step 2, the fluidized bed reactor is a programmable temperature-controlled fluidized bed with a diameter of φ60×900 mm.

4. The method for extracting bio-oil from beer industry waste according to claim 1, characterized in that: In step 2, the flow rate of nitrogen gas is 850 mL / min.