Dunaliella salina powder preparation system and dunaliella salina powder preparation method

Abstract

The invention discloses a preparation system of dunaliella salina powder and a preparation method of the dunaliella salina powder. The system comprises a culture pond, a filter, a desalting device, sedimentation and concentration equipment, a sodium bicarbonate storage tank, a stirrer and a spray drying tower, putting the dunaliella salina seeds into a sodium chloride culture pond to enrich a large amount of carotene in the dunaliella salina so as to prepare qualified dunaliella salina Feeding the qualified algae liquid into a filter to remove suspended impurities in the algae liquid; washing the algae liquid with purified water after impurity removal, and removing sodium chloride until the algae liquid reaches the desalination standard; feeding the desalted algae liquid into a sedimentation centrifuge, adding a hydrochloric acid solution, settling and concentrating, and discharging supernate to prepare primary algae paste; feeding the primary algae paste and a sodium bicarbonate solution into a stirrer, uniformly mixing, and standing for layering to obtain supernate and secondary algae paste; and feeding the secondary algae paste into a spray drying tower for spray drying to obtain dunaliella salina powder particles.

Description

Technical Field:

[0001] The present invention relates to the technical field of processing of Dunaliella salina powder, and particularly relates to a preparation system and a preparation method of Dunaliella salina powder. Background Art:

[0002] Dunaliella salina (abbreviation: D. salina) is a single-celled alga with high light energy conversion rate, fast production and reproduction, and suitable for cultivation. It can accumulate a large amount of carotenoids under suitable conditions; Dunaliella salina powder, as a source of carotenoids, pigments, proteins and vitamins, has been widely used in products such as food, nutritional health products, medicines, animal feed additives, etc. The traditional method for preparing Dunaliella salina powder is as follows: cultivate Dunaliella salina in a high-concentration sodium chloride solution to enrich a large amount of carotenoids in Dunaliella salina. Secondly, repeatedly wash the algal solution with pure water to remove the sodium chloride component until the desalination standard is reached; then, sediment and concentrate Dunaliella salina with hydrochloric acid, drain the supernatant to obtain a Dunaliella salina concentrate; then, use a sedimentation centrifuge to centrifuge the algal paste; finally, dry and pulverize to obtain algal powder.

[0003] In the above process, using hydrochloric acid for sedimentation and concentration will cause Dunaliella salina to combine with hydrogen ions, resulting in the residue of acid value ions, leading to a high acid value index in the algal powder product; and the acid value is an important index related to the quality of Dunaliella salina. The acid value is used to describe the degree of rancidity of oils and fats. The smaller the acid value, the better the quality of the oil, the freshness and the refining degree. According to the enterprise standard, the acid value of Dunaliella salina generally requires ≤8.

[0004] At present, in order to avoid a high acid value index in the finished algal powder product, the Dunaliella salina concentrate obtained after sedimentation and concentration is usually washed with water and eluted with a NaOH solution to reduce the acid value. The effect of reducing the acid value of algal powder by washing with water is not obvious. Although using a NaOH solution for elution can significantly reduce the acid value of algal powder, it will greatly reduce the carotenoid content of the algal powder, affecting the nutritional value of Dunaliella salina and causing economic losses. Summary of the Invention:

[0005] The first object of the present invention is to provide a preparation system of Dunaliella salina powder with obvious acid value elution effect and high nutritional value of Dunaliella salina.

[0006] To solve the problem that the effect of reducing the acid value of algal powder by washing with water is not obvious, and using a NaOH solution for eluting algal powder will reduce the carotenoid content, thus resulting in a reduction in the nutritional value of Dunaliella salina, the second object of the present invention is to provide a preparation method of Dunaliella salina powder.

[0007] The first object of the present invention is implemented by the following technical solution: A preparation system of Dunaliella salina powder, which includes a cultivation pond, a filter, a desalination device, a sedimentation and concentration device, a sodium bicarbonate storage tank, a mixer and a spray drying tower;

[0008] The outlet of the cultivation pond is communicated with the inlet of the filter, the outlet of the filter is communicated with the feed inlet of the desalination cleaning machine of the desalination device, the discharge outlet of the desalination cleaning machine of the desalination device is communicated with the inlet of the sedimentation centrifuge of the sedimentation and concentration equipment, the clear liquid outlet of the sedimentation centrifuge of the sedimentation and concentration equipment is communicated with the cultivation pond, the algal liquid outlet of the sedimentation centrifuge of the sedimentation and concentration equipment is communicated with the feed inlet of the mixer, the outlet of the sodium bicarbonate storage tank is communicated with the liquid inlet of the mixer, and the outlet of the mixer is communicated with the inlet of the spray drying tower.

[0009] Preferably, the desalination device includes a water storage tank and the desalination cleaning machine. The outlet of the water storage tank is communicated with the water inlet of the desalination cleaning machine, and the drain outlet of the desalination cleaning machine is communicated with the cultivation pond.

[0010] Preferably, the sedimentation and concentration device includes a hydrochloric acid storage tank and the sedimentation centrifuge. The outlet of the hydrochloric acid storage tank is communicated with the chemical agent inlet of the sedimentation centrifuge.

[0011] Preferably, the water inlet of the mixer is communicated with the outlet of the deionized water tank.

[0012] Preferably, it further includes a vibrating screen, a mixer and a vacuum packaging machine. The outlet of the spray drying tower is communicated with the inlet of the vibrating screen, the outlet of the vibrating screen is communicated with the inlet of the mixer, and the outlet of the mixer is communicated with the inlet of the vacuum packaging machine.

[0013] The second object of the present invention is implemented by the following technical solution: A method for preparing Dunaliella salina powder, which includes the following steps:

[0014] (1) Cultivation: Put the selected high-quality algal species into the sodium chloride cultivation pond for cultivation to enrich a large amount of carotene in Dunaliella salina and obtain qualified algal liquid;

[0015] (2) Impurity removal: Send the qualified algal liquid into the filter to remove the suspended impurities in the algal liquid;

[0016] (3) Desalination: Wash the impurity-removed algal liquid repeatedly with pure water to remove the sodium chloride component until the desalination standard is reached;

[0017] (4) Sedimentation and concentration: Send the desalinated algal liquid into the sedimentation centrifuge, add hydrochloric acid solution into the sedimentation centrifuge through the hydrochloric acid storage tank, and after sedimentation and concentration, discharge the supernatant to obtain primary algal paste;

[0018] (5) Acid value elution: Feed the primary algal paste into a blender, and add the acid value eluent through a sodium bicarbonate storage tank. The acid value eluent is a sodium bicarbonate solution with a mass fraction of 2.5 - 7.5%. Stir the primary algal paste and the acid value eluent evenly through the blender to form a mixed solution. After standing and separating layers, obtain the supernatant and the secondary algal paste after deacidification;

[0019] (6) Drying: Feed the secondary algal paste into a spray drying tower for spray drying to obtain Dunaliella salina powder particles with a water content of 5 - 7%.

[0020] Preferably, it further includes the following steps: (7) Screening: Feed the Dunaliella salina powder particles into a vibrating screen for screening, and recycle the large particles; (8) Packaging: The refined Dunaliella salina powder after screening is vacuum-packed by a vacuum packaging machine.

[0021] Preferably, in the step (5), the volume ratio of the primary algal paste to the acid value eluent is 1:1.

[0022] Preferably, in the step (5), the stirring time is 20 - 40 min, and the mixing temperature is 25 - 30 °C; in the step (6), the inlet air temperature of spray drying is 168 - 178 °C, and the outlet air temperature of spray drying is 55 - 65 °C.

[0023] Preferably, in the step (5), deionized water is added to the mixed solution to adjust the solid-liquid ratio of the mixed solution to 0.25 - 0.55.

[0024] Advantages of the present invention: Compared with using pure water to elute the acid value of Dunaliella salina, using a sodium bicarbonate solution to elute the acid value of Dunaliella salina in the present invention can significantly reduce the acid value of the algal powder; compared with using a NaOH solution to elute the acid value of Dunaliella salina, using a sodium bicarbonate solution in the present invention has good buffering properties and a relatively wide dosage range, which can avoid hydrolysis of triglycerides and oxidation of carotenoids in the Dunaliella salina powder during elution, protect other organic nutrient components such as amino acids and polysaccharides from being damaged, ensure that Dunaliella salina has a high nutritional value, and avoid economic losses. Description of the drawings:

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative labor, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is the process flow chart of Embodiment 1.

[0027] The markings of each component in the attached drawings are as follows: aquaculture pond 1, filter 2, desalination device 3, water storage tank 3.1, desalination cleaning machine 3.2, sedimentation and concentration equipment 4, hydrochloric acid storage tank 4.1, sedimentation centrifuge 4.2, sodium bicarbonate storage tank 5, mixer 6, deionized water tank 7, spray drying tower 8, vibrating screen 9, mixer 10, vacuum packaging machine 11. Detailed implementation manners:

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0029] Embodiment 1: As Figure 1 shown, a preparation system for Dunaliella salina powder includes an aquaculture pond 1, a filter 2, a desalination device 3, a sedimentation and concentration equipment 4, a sodium bicarbonate storage tank 5, a mixer 6, a deionized water tank 7, a spray drying tower 8, a vibrating screen 9, a mixer 10 and a vacuum packaging machine 11; the aquaculture pond 1 is filled with a sodium chloride solution for culturing Dunaliella salina to enrich a large amount of carotenoids in Dunaliella salina, and the filter is used to remove suspended impurities in the algal solution; the desalination device 3 includes a water storage tank 3.1 and a desalination cleaning machine 3.2, and pure water is conveyed into the desalination cleaning machine 3.2 through the water storage tank 3.1 to wash the algal solution and remove the sodium chloride component; the sedimentation and concentration equipment 4 includes a hydrochloric acid storage tank 4.1 and a sedimentation centrifuge 4.2, the desalinated algal solution is centrifuged through the sedimentation centrifuge 4.2, and hydrochloric acid is added through the hydrochloric acid storage tank 4.1 to quickly coagulate Dunaliella salina to obtain a primary algal paste and brine, and the brine returns to the aquaculture pond 1 for recycling; the mixer 6 is used to stir the primary algal paste and the acid value eluent evenly to form a mixed solution; deionized water is added into the mixer 6 through the deionized water tank 7 to adjust the solid-liquid ratio of the mixed solution, so that the primary algal paste and the acid value eluent are in full contact to improve the deacidification effect; the deacidified secondary algal paste is spray-dried through the spray drying tower 8 to prepare Dunaliella salina powder particles; large-particle Dunaliella salina powder is screened out through the vibrating screen 9, and the large-particle Dunaliella salina is recovered and crushed; the Dunaliella salina powder is mixed evenly through the mixer 10, and the mixed Dunaliella salina powder is vacuum-packaged through the vacuum packaging machine 11;

[0030] The outlet of the cultivation pond 1 is connected to the inlet of the filter 2 through a pipeline. The outlet of the filter 2 is connected to the feed inlet of the desalination and cleaning machine 3.2 through a pipeline. The water inlet of the desalination and cleaning machine 3.2 is connected to the outlet of the water storage tank 3.1 through a pipeline. The drainage outlet of the desalination and cleaning machine 3.2 is connected to the cultivation pond 1 through a pipeline. The discharge outlet of the desalination and cleaning machine 3.2 is connected to the inlet of the sedimentation centrifuge 4.2 through a pipeline. The chemical agent inlet of the sedimentation centrifuge 4.2 is connected to the outlet of the hydrochloric acid storage tank 4.1 through a pipeline. The clear liquid outlet of the sedimentation centrifuge 4.2 is connected to the cultivation pond 1 through a pipeline;

[0031] The algal liquid outlet of the sedimentation centrifuge 4.2 is connected to the feed inlet of the mixer 6 through a pipeline. The liquid inlet of the mixer 6 is connected to the outlet of the sodium bicarbonate storage tank 5 through a pipeline. The water inlet of the mixer 6 is connected to the outlet of the deionized water tank 7 through a pipeline. The outlet of the mixer 6 is connected to the inlet of the spray drying tower 8 through a pipeline. The outlet of the spray drying tower 8 is connected to the inlet of the vibrating screen 9 through a pipeline. The outlet of the vibrating screen 9 is connected to the inlet of the mixer 10 through a pipeline. The outlet of the mixer 10 is connected to the inlet of the vacuum packaging machine 11 through a pipeline.

[0032] Working process: Put the selected high-quality algal species into the sodium chloride cultivation pond 1 for cultivation to enrich a large amount of carotene in the Dunaliella salina. When the density of the algal liquid is 400,000 - 500,000 per milliliter and the carotene content is 10 - 20 grams per cubic meter, qualified algal liquid is obtained;

[0033] Send the qualified algal liquid into the filter 2 to remove the suspended impurities in the algal liquid. Send the impurity-removed algal liquid into the desalination and cleaning machine 3.2, add pure water into the desalination and cleaning machine 3.2 through the water storage tank 3.1, and repeatedly wash the impurity-removed algal liquid with pure water to remove the sodium chloride component until the desalination standard is reached. The desalinated water after washing returns to the cultivation pond 1 through a pipeline for recycling;

[0034] Send the desalinated algal liquid into the sedimentation centrifuge 4.2, add hydrochloric acid solution into the sedimentation centrifuge 4.2 through the hydrochloric acid storage tank 4.1. After sedimentation and concentration, discharge the supernatant to obtain the primary algal paste;

[0035] Send the primary algal paste into the mixer 6, add 2.5 - 7.5% sodium bicarbonate solution (acid value eluent) into the mixer 6 through the sodium bicarbonate storage tank 5. Stir the primary algal paste and the acid value eluent evenly through the mixer 6, and stir for 20 - 40 minutes under the condition of 25 - 30 °C to form a mixed solution. Add deionized water into the mixed solution through the deionized water tank 7 to adjust the solid-liquid ratio of the mixed solution to 0.25 - 0.55, and continue to stir to mix evenly. After the mixed solution stands and layers, obtain the supernatant and the secondary algal paste after deacidification;

[0036] Feed the secondary algal paste into the spray drying tower 8 for spray drying. The inlet air temperature of the spray drying tower 8 is 168 - 178 °C, and the outlet air temperature is 55 - 65 °C, to obtain Dunaliella salina powder particles with a water content of 5 - 7%;

[0037] Feed the Dunaliella salina powder particles into a vibrating screen 9 with 80 meshes for screening, and recycle the large particles; the refined Dunaliella salina powder after screening is vacuum-packed using an aluminum foil composite bag by a vacuum packing machine 11 under the condition of a vacuum degree of -0.01 MPa - 0.02 MPa to obtain the finished product.

[0038] Example 2: A method for preparing Dunaliella salina powder using the method for preparing Dunaliella salina powder of a preparation system in Example 1, which includes the following steps:

[0039] (1) Cultivation: Put the selected high-quality algal species into the sodium chloride cultivation pond 1 for cultivation to enrich a large amount of carotene in Dunaliella salina. When the algal liquid density is 400,000 - 500,000 / ml and the carotene content is 10 - 20 g / m³, qualified algal liquid is obtained;

[0040] (2) Impurity removal: Feed the qualified algal liquid into the filter 2 to remove the suspended impurities in the algal liquid;

[0041] (3) Desalination: Wash the algal liquid after impurity removal repeatedly with pure water to remove the sodium chloride component until the desalination standard is reached;

[0042] (4) Sedimentation and concentration: Feed the desalinated algal liquid into the sedimentation centrifuge 4.2, add hydrochloric acid solution into the sedimentation centrifuge 4.2 through the hydrochloric acid storage tank 4.1. After sedimentation and concentration, discharge the supernatant to obtain the primary algal paste;

[0043] (5) Acid value elution: Feed 1000 ml of the primary algal paste (about containing 150 - 250 g of Dunaliella salina powder) into the blender 6, add 1000 ml of 2.5% sodium bicarbonate solution into the blender 6 through the sodium bicarbonate storage tank 5. Stir the primary algal paste and the acid value eluent evenly by the blender 6, and stir for 20 min at 25 °C to form a mixed solution;

[0044] Add deionized water into the mixed solution through the deionized water tank 7, adjust the solid-liquid ratio of the mixed solution to 0.25, and continue to stir to mix evenly; after the mixed solution stands and layers, obtain the supernatant and the secondary algal paste after deacidification;

[0045] (6) Drying: Feed the secondary algal paste into the spray drying tower 8 for spray drying. The inlet air temperature of the spray drying tower 8 is 168 °C, and the outlet air temperature is 55 °C, to obtain Dunaliella salina powder particles with a water content of 5 - 7%;

[0046] (7) Screening: Feed the Dunaliella salina powder particles into a vibrating screen 9 with 80 meshes for screening, and recycle the large particles;

[0047] (8) Packaging: The sieved refined Dunaliella salina powder is vacuum-packed by a vacuum packing machine 11 using an aluminum foil composite bag under the condition of a vacuum degree of -0.01 MPa - 0.02 MPa to obtain the finished product.

[0048] (9) Acid value detection: The finished product is sent to the scientific research institute for testing, and the measured acid value and various indicators are as follows: acid value: 7.5 mg / g; pH value: 6.06; carotene content: 4.65%; moisture: 6.55%; ash: 10.77%; lead: 0.53 mg / Kg; arsenic: 6.48 mg / Kg.

[0049] Example 3: Using the Dunaliella salina powder preparation method of the Dunaliella salina powder preparation system in Example 1, it includes the following steps:

[0050] (1) Cultivation: The selected high-quality algal species are put into the sodium chloride cultivation pond 1 for cultivation to enrich a large amount of carotene in Dunaliella salina. When the density of the algal liquid is 400,000 - 500,000 / ml and the carotene content is 10 - 20 g / cubic meter, qualified algal liquid is obtained;

[0051] (2) Impurity removal: The qualified algal liquid is sent to the filter 2 to remove the suspended impurities in the algal liquid;

[0052] (3) Desalting: The algal liquid after impurity removal is repeatedly washed with pure water to remove the sodium chloride component until the desalting standard is reached;

[0053] (4) Sedimentation and concentration: The desalted algal liquid is sent to the sedimentation centrifuge 4.2, and hydrochloric acid solution is added to the sedimentation centrifuge 4.2 through the hydrochloric acid storage tank 4.1. After sedimentation and concentration, the supernatant is discharged to obtain the primary algal paste;

[0054] (5) Acid value elution: 1000 ml of the primary algal paste (about containing 150 - 250 g of Dunaliella salina powder) is sent to the blender 6, and 1000 ml of 5% sodium bicarbonate solution is added to the blender 6 through the sodium bicarbonate storage tank 5. The primary algal paste and the acid value eluent are stirred evenly by the blender 6, and stirred for 30 min at 28°C to form a mixed solution;

[0055] Deionized water is added to the mixed solution through the deionized water tank 7 to adjust the solid-liquid ratio of the mixed solution to 0.4, and continue to stir to mix evenly; after the mixed solution stands and layers, the supernatant and the secondary algal paste after deacidification are obtained;

[0056] (6) Drying: The secondary algal paste is sent to the spray drying tower 8 for spray drying. The inlet air temperature of the spray drying tower 8 is: 173°C, and the outlet air temperature of the spray drying tower 8 is 60°C to obtain Dunaliella salina powder particles with a water content of 5 - 7%;

[0057] (7) Sieving: Feed the Dunaliella salina powder particles into a vibrating sieve 9 with 80 meshes for sieving, and recycle the large particles;

[0058] (8) Packaging: The sieved refined Dunaliella salina powder is vacuum-packed by a vacuum packaging machine 11 using an aluminum foil composite bag under the condition of a vacuum degree of -0.01 MPa - 0.02 MPa to obtain the finished product.

[0059] (9) Acid value detection: Send the finished product to the scientific research institute for detection, and the measured acid value and various indicators are as follows: acid value: 6.7 mg / g; pH value: 9.68; carotene content: 4.73%; moisture: 5.37%; ash: 12.48%; lead: 0.19 mg / Kg; arsenic: 6.37 mg / Kg.

[0060] Example 4: A method for preparing Dunaliella salina powder using the Dunaliella salina powder preparation system of Example 1, which includes the following steps:

[0061] (1) Cultivation: Put the selected high-quality algal species into the sodium chloride cultivation pond 1 for cultivation to enrich a large amount of carotene in Dunaliella salina. When the density of the algal liquid is 400,000 - 500,000 / ml and the carotene content is 10 - 20 g / m³, qualified algal liquid is obtained;

[0062] (2) Impurity removal: Feed the qualified algal liquid into the filter 2 to remove the suspended impurities in the algal liquid;

[0063] (3) Desalination: Wash the impurity-removed algal liquid repeatedly with pure water to remove the sodium chloride component until the desalination standard is reached;

[0064] (4) Sedimentation and concentration: Feed the desalinated algal liquid into the sedimentation centrifuge 4.2, add hydrochloric acid solution into the sedimentation centrifuge 4.2 through the hydrochloric acid storage tank 4.1. After sedimentation and concentration, discharge the supernatant to obtain the primary algal paste;

[0065] (5) Acid value elution: Feed 1000 ml of the primary algal paste (about containing 150 - 250 g of Dunaliella salina powder) into the mixer 6, add 1000 ml of 7.5% sodium bicarbonate solution into the mixer 6 through the sodium bicarbonate storage tank 5. Stir the primary algal paste and the acid value eluent evenly by the mixer 6, and stir for 40 min at 30 °C to form a mixed solution;

[0066] Add deionized water into the mixed solution through the deionized water tank 7, adjust the solid-liquid ratio of the mixed solution to 0.55, and continue to stir to mix evenly; after the mixed solution stands and layers, obtain the supernatant and the secondary algal paste after deacidification;

[0067] (6) Drying: Feed the secondary algal paste into the spray drying tower 8 for spray drying. The inlet air temperature of the spray drying tower 8 is: 178 °C, and the outlet air temperature of the spray drying tower 8 is 65 °C to obtain Dunaliella salina powder particles with a water content of 5 - 7%;

[0068] (7) Sieving: Feed the Dunaliella salina powder particles into a vibrating sieve 9 with 80 meshes for sieving, and recycle the large particles;

[0069] (8) Packaging: The refined Dunaliella salina powder after sieving is vacuum-packed by a vacuum packaging machine 11 using an aluminum foil composite bag under the condition of a vacuum degree of -0.01 MPa - 0.02 MPa to obtain the finished product.

[0070] (9) Acid value detection: Send the finished product for inspection to the academy of sciences for detection, and the measured acid value and various indicators are as follows: acid value: 7.5 mg / g; pH value: 10.2; carotene content: 4.65%; moisture: 6.87%; ash: 13.22%; lead: 0.66 mg / Kg; arsenic: 6.08 mg / Kg.

[0071] Comparative example 1: The difference between Comparative example 1 and Example 2 is that: the acid value elution step (5) is not carried out, and other methods refer to the preparation method of Dunaliella salina powder in Example 2;

[0072] Send the finished product prepared in Comparative example 1 for inspection to the academy of sciences for detection, and the measured acid value and various indicators are as follows: acid value: 14.2 mg / g; pH value: 2.53; carotene content: 4.78%; moisture: 5.2%; ash: 9.21%; lead: 0.97 mg / Kg; arsenic: 7.81 mg / Kg.

[0073] Comparative example 2: The difference between Comparative example 2 and Example 2 is that: in step (5), pure water is used to replace the sodium bicarbonate solution to carry out acid value elution on the primary algal paste, and other methods refer to the preparation method of Dunaliella salina powder in Example 2;

[0074] Send the finished product prepared in Comparative example 2 for inspection to the academy of sciences for detection, and the measured acid value and various indicators are as follows: acid value: 13.6 mg / g; pH value: 3.11; carotene content: 4.29%; moisture: 6.8%; ash: 3.48%; lead: 0.95 mg / Kg; arsenic: 7.27 mg / Kg.

[0075] Comparative example 3: The difference between Comparative example 3 and Example 2 is that: in step (5), a sodium hydroxide solution with a mass fraction of 2.5% is used to carry out acid value elution on the primary algal paste, and other methods refer to the preparation method of Dunaliella salina powder in Example 2;

[0076] Send the finished product prepared in Comparative example 3 for inspection to the academy of sciences for detection, and the measured acid value and various indicators are as follows: acid value: 3.88 mg / g; pH value: 7.59; carotene content: 3.96%; moisture: 6.8%; ash: 10.47%; lead: 0.95 mg / Kg; arsenic: 6.47 mg / Kg.

[0077] Comparative Example 4: The difference between Comparative Example 4 and Example 2 is that in step (5), a sodium hydroxide solution with a mass fraction of 5% is used to elute the acid value of the primary algal paste, and the preparation method of Dunaliella salina powder in Example 2 is otherwise referred to;

[0078] The finished product obtained in Comparative Example 4 was sent to the Academy of Sciences for testing, and the measured acid value and various indicators are as follows: acid value: 1.17 mg / g; pH value: 10.54; carotene content: 3.14%; moisture: 7.79%; ash: 11.81%; lead: 0.98 mg / Kg; arsenic: 6.63 mg / Kg.

[0079] Based on the acid value and various indicators of the finished Dunaliella salina powder in Example 2, Example 3, Example 4 and Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, Table 1 was prepared.

[0080] Table 1: Acid value and various indicators of the finished Dunaliella salina powder

[0081]

[0082] Result analysis: ① Comparing Comparative Example 2 with Comparative Example 1, it can be seen that by eluting the acid value with pure water, the acid value of the Dunaliella salina powder does not decrease significantly; comparing Comparative Example 3 and 4 with Comparative Example 1, it can be seen that by eluting the acid value with sodium hydroxide solution, although the acid value of the Dunaliella salina powder decreases significantly, the loss of carotene content is large, and the nutritional value of the Dunaliella salina powder decreases.

[0083] ② Comparing Example 2, 3, 4 with Comparative Example 2, 3, 4, it can be seen that using a 2.5 - 7.5% NaHCO3 solution as the acid value eluent, the acid value of the Dunaliella salina powder decreases significantly, the loss of carotene content is small, and the moisture, ash, lead content, and arsenic content all meet the enterprise standards.

[0084] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A preparation system for Dunaliella salina powder, characterized in that, It includes a culture pond, a filter, a desalination device, a sedimentation and concentration equipment, a sodium bicarbonate storage tank, a mixer, and a spray drying tower; The outlet of the culture pond is communicated with the inlet of the filter, the outlet of the filter is communicated with the feed inlet of the desalination and cleaning machine of the desalination device, the discharge outlet of the desalination and cleaning machine of the desalination device is communicated with the inlet of the sedimentation centrifuge of the sedimentation and concentration equipment, the clear liquid outlet of the sedimentation centrifuge of the sedimentation and concentration equipment is communicated with the culture pond, the algal liquid outlet of the sedimentation centrifuge of the sedimentation and concentration equipment is communicated with the feed inlet of the mixer, the outlet of the sodium bicarbonate storage tank is communicated with the liquid inlet of the mixer, and the outlet of the mixer is communicated with the inlet of the spray drying tower.

2. The preparation system of a Dunaliella salina powder according to claim 1, characterized in that, The desalination device includes a water storage tank and the desalination and cleaning machine. The outlet of the water storage tank is communicated with the water inlet of the desalination and cleaning machine, and the drain outlet of the desalination and cleaning machine is communicated with the culture pond.

3. The preparation system of Dunaliella salina powder according to claim 1, wherein, The sedimentation and concentration device includes a hydrochloric acid storage tank and the sedimentation centrifuge. The outlet of the hydrochloric acid storage tank is communicated with the chemical agent inlet of the sedimentation centrifuge.

4. A preparation system for Dunaliella salina powder according to claim 2, characterized in that, The water inlet of the mixer is communicated with the outlet of the deionized water tank.

5. The preparation system of a dunaliella salina powder according to claim 1, wherein It further includes a vibrating screen, a mixer, and a vacuum packaging machine. The outlet of the spray drying tower is communicated with the inlet of the vibrating screen, the outlet of the vibrating screen is communicated with the inlet of the mixer, and the outlet of the mixer is communicated with the inlet of the vacuum packaging machine.

6. A method for preparing Dunaliella salina powder using the preparation system for Dunaliella salina powder according to any one of claims 1-5, characterized in that, It includes the following steps: (1) Cultivation: Put the selected high-quality algal species into the sodium chloride culture pond for cultivation to enrich a large amount of carotene in the Dunaliella salina and obtain qualified algal liquid; (2) Impurity removal: Send the qualified algal liquid into the filter to remove the suspended impurities in the algal liquid; (3) Desalination: Wash the impurity-removed algal liquid repeatedly with pure water to remove the sodium chloride component until the desalination standard is reached; (4) Sedimentation and concentration: Send the desalinated algal liquid into the sedimentation centrifuge, add hydrochloric acid solution into the sedimentation centrifuge through the hydrochloric acid storage tank. After sedimentation and concentration, discharge the supernatant to obtain the primary algal paste; (5) Acid value elution: Send the primary algal paste into the mixer, add the acid value elution agent through the sodium bicarbonate storage tank. The acid value elution agent uses a sodium bicarbonate solution with a mass fraction of 2.5-7.5%. Stir the primary algal paste and the acid value elution agent evenly through the mixer to form a mixed liquid. After standing and separating, obtain the supernatant and the secondary algal paste after deacidification; (6) Drying: Send the secondary algal paste into the spray drying tower for spray drying to obtain salt algal powder particles with a water content of 5-7%; 7. The method for preparing Dunaliella salina powder according to claim 6, characterized in that, It further includes the following steps: (7) Screening: Send the salt algal powder particles into the vibrating screen for screening and recycle the large particles; (8) Packaging: Vacuum package the refined salt algal powder after screening through the vacuum packaging machine.

8. The method for preparing Dunaliella salina powder according to claim 6, wherein In the step (5), the volume ratio of the primary algal paste to the acid value elution agent is 1:

1.

9. The preparation method of Dunaliella salina powder according to claim 6, wherein In the step (5), the stirring time is 20-40 min and the mixing temperature is 25-30 °C; in the step (6), the inlet air temperature of the spray drying is 168-178 °C, and the outlet air temperature of the spray drying is 55-65 °C.

10. The preparation method of Dunaliella salina powder according to claim 6, characterized in that In the step (5), deionized water is added to the mixed solution, and the solid-liquid ratio of the mixed solution is adjusted to 0.25-0.55.

Images