Ammonia gas recycling device for hydroxyapatite production

Abstract

The utility model discloses an ammonia gas recycling device for hydroxyapatite production, which comprises a production reaction kettle for preparing hydroxyapatite through reaction, a circulating tank is arranged on the side surface of the production reaction kettle, and connecting pipes communicated with each other are fixedly mounted between the circulating tank and the production reaction kettle. A negative pressure pump is fixedly mounted at the bottom end of the connecting pipe, the lower end of the circulating tank is communicated with the production reaction kettle through a second return pipe, and separated water vapor enters the production reaction kettle through a first return pipe fixedly mounted at the lower end of the water vapor separator. According to the ammonia gas recycling device for hydroxyapatite production, a novel structural design is adopted, part of ammonia gas enters the circulating tank through a flow dividing pipe, drives a driving blade to drive a stirring rod to rotate under the action of airflow, and then flows back through a third backflow pipe, so that dilute phosphoric acid is stirred by utilizing the rotation of the stirring rod, and the stirring effect is improved. And the contact area of ammonia gas and dilute phosphoric acid is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydroxyapatite production technical field, specifically is a kind of ammonia gas recycling device for hydroxyapatite production. BACKGROUND

[0002] Hydroxyapatite is a kind of synthetic apatite compound, with good biological activity and biocompatibility, often used in biomedical applications, such as bone repair and regeneration, etc., is generally prepared by chemical synthesis method, i.e. the production raw materials are put into reaction kettle for chemical reaction, but ammonia gas can be generated during reaction, which can be recycled.

[0003] In the prior art, a kind of ammonia gas recycling device in the preparation of hydroxyapatite process is disclosed in Chinese patent with publication number CN206262324U, including sizing tank, reaction kettle, condenser, gas-liquid separator, ammonia gas absorption tank, magnetic pump, vacuum pump, the reaction kettle, ammonia gas absorption tank form circulation loop by connecting pipe, magnetic pump, the ammonia gas absorption tank is equipped with dilute phosphoric acid, the coil on the bottom of tank is equipped with microporous aeration tray, ammonia gas forms 2mm or so bubble after microporous aeration tray and is fully contacted with the absorption liquid in absorption tank, and the solution after absorption is pumped back to reaction kettle by magnetic pump and circulates reaction;The utility model utilizes absorption tank to absorb by-product ammonia gas, realizes clean production, avoids that ammonia gas is not handled properly and causes pollution to environment or increases processing cost, and the microporous aeration tray that is additionally provided on the coil at the bottom of absorption tank is small in aperture and dense, with high absorption efficiency, the whole device is simple in structure, easy to operate, waste gas cannot cause environmental pollution, reduces the production cost of hydroxyapatite, and is worth promoting.

[0004] The above-mentioned device utilizes dilute phosphoric acid to dissolve ammonia gas to achieve the purpose of recycling, but in actual use process, the contact time of ammonia gas after discharge and dilute phosphoric acid solution is limited, so the two may not be fully reacted, which ultimately affects the recycling rate of ammonia gas. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of ammonia gas recycling device for hydroxyapatite production to solve the problem that ammonia gas is not fully reacted with dilute phosphoric acid in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of ammonia gas recycling device for hydroxyapatite production, including production reaction kettle for reaction preparation hydroxyapatite, the production reaction kettle side is provided with circulation tank, further including:

[0007] Intercommunicating connecting pipe is fixedly installed between the circulation tank and production reaction kettle, and negative pressure pump is fixedly installed at the bottom of the connecting pipe, and the lower end of the circulation tank is communicated with production reaction kettle by second reflux pipe.

[0008] The water vapor separator is fixedly installed at the middle position of the connecting pipe and is used for separating ammonia and water vapor; the separated water vapor enters the production reaction kettle through a first reflux pipe fixedly installed at the lower end of the water vapor separator;

[0009] The lower end of the negative pressure pump is provided with a conveying pipe located inside the circulating tank, and a stirring mechanism for stirring to increase the ammonia absorption effect is arranged at the lower end of the conveying pipe; the stirring mechanism comprises a stirring rod in the shape of a claw fixedly installed at the bottom end of the conveying pipe.

[0010] Preferably, the stirring rod is in a hollow structure and is in communication with the conveying pipe, and exhaust holes are arranged through the upper surface of the stirring rod.

[0011] Preferably, the conveying pipe is rotatably connected between the top end and the negative pressure pump, and a driving blade is fixedly installed outside the upper end of the conveying pipe.

[0012] Preferably, the driving blade is in height correspondence with a shunt pipe and a third reflux pipe fixedly installed on the side surface of the upper end of the circulating tank, and the shunt pipe and the third reflux pipe are in communication with the connecting pipe.

[0013] Preferably, a lower baffle and an upper baffle for slowing down the flow rate of ammonia are fixedly installed inside the circulating tank.

[0014] Preferably, through holes are arranged in the lower baffle and the upper baffle, and the positions of the through holes in the upper and lower baffles are staggered.

[0015] Preferably, an annular heat preservation plate is fixedly installed outside the circulating tank, a heating pipe in the shape of a spiral is fixedly installed inside the heat preservation plate, and the heating pipe is in communication with the production reaction kettle.

[0016] Compared with the prior art, the hydroxyapatite production ammonia recycling device has the advantages that:

[0017] 1. The water vapor generated by chemical reaction is conveyed to the circulating tank through the connecting pipe together with the ammonia, the dilute phosphoric acid in the circulating tank reacts with the ammonia to absorb the ammonia, the generated phosphate is conveyed to the production reaction kettle through the second reflux pipe to form a recycling use;

[0018] Further, part of the ammonia enters the circulating tank through the shunt pipe, and under the action of the airflow, the driving blade is pushed to drive the stirring rod to rotate, and then the ammonia is returned through the third reflux pipe, so that the rotation of the stirring rod stirs the dilute phosphoric acid, and the contact area of the ammonia and the dilute phosphoric acid is increased.

[0019] Further, the ammonia is blocked by the lower baffle and the upper baffle during the upward movement of the dilute phosphoric acid, and the through holes in the lower baffle and the upper baffle are staggered, so that the rising speed of the ammonia is further slowed down, and the ammonia can be fully reacted.

[0020] 2、The internal heat of the production reaction kettle enters the heating pipe during the working process, the circulating tank is heated by the spiral heating pipe, so that the temperature of the dilute phosphoric acid is increased, the overall reaction speed is increased, and the heat preservation plate outside the heating pipe can achieve the heat preservation purpose, and heat waste is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole structure schematic view of the utility model;

[0022] Figure 2 It is a circulating tank cross section structure schematic view of the utility model;

[0023] Figure 3 It is a conveying pipe structure schematic view of the utility model;

[0024] Figure 4 It is a heat preservation plate cross section structure schematic view of the utility model;

[0025] Figure 5 It is a through hole structure schematic view of the utility model;

[0026] Figure 6 It is a shunt pipe and third reflux pipe position relation structure schematic view of the utility model.

[0027] In the drawing: 1, production reaction kettle; 2, circulating tank; 3, connecting pipe; 4, negative pressure pump; 5, water vapor separator; 6, first reflux pipe; 7, conveying pipe; 8, stirring rod; 9, exhaust hole; 10, second reflux pipe; 11, driving blade; 12, shunt pipe; 13, third reflux pipe; 14, lower baffle; 15, upper baffle; 16, through hole; 17, heat preservation plate; 18, heating pipe. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] Embodiment one: please refer to Figure 1 And Figure 2The embodiment is used for the production of hydroxyapatite, and provides the following technical scheme. Specifically disclosed is a production reactor 1 for preparing hydroxyapatite, which is provided with a circulating tank 2 on the side. The circulating tank 2 and the production reactor 1 are fixedly connected with a connecting pipe 3, the bottom end of the connecting pipe 3 is fixedly connected with a negative pressure pump 4, the lower end of the circulating tank 2 is connected with the production reactor 1 through a second reflux pipe 10, a water vapor separator 5 for separating ammonia and water vapor is fixedly connected to the middle position of the connecting pipe 3, the water vapor separated after separation enters the production reactor 1 through a first reflux pipe 6 fixedly connected to the lower end of the water vapor separator 5, a stirring rod 8 is in a hollow structure and is in communication with a conveying pipe 7, and the upper surface of the stirring rod 8 is provided with an exhaust hole 9.

[0030] In use, the raw materials for producing hydroxyapatite are first put into the production reactor 1, and the raw materials are chemically reacted under high temperature and high pressure. The by-product ammonia generated in the reaction process is transported to the conveying pipe 7 through the connecting pipe 3 under the action of the negative pressure pump 4 (the ammonia and water vapor are separated by the water vapor separator 5, and the separated water vapor returns to the production reactor 1 through the first reflux pipe 6), and then is discharged from the exhaust hole 9 of the stirring rod 8 below the conveying pipe 7. The discharged ammonia reacts with the stored dilute phosphoric acid in the circulating tank 2 to generate phosphate, thereby achieving the purpose of absorbing ammonia. The generated phosphate returns to the production reactor 1 through the second reflux pipe 10 to achieve recycling.

[0031] Embodiment two: please refer to Figures 2-6 The embodiment is used for the production of hydroxyapatite, and provides the following technical scheme. Specifically disclosed is a production reactor 1 for preparing hydroxyapatite, which is provided with a circulating tank 2 on the side. The circulating tank 2 and the production reactor 1 are fixedly connected with a connecting pipe 3, the bottom end of the connecting pipe 3 is fixedly connected with a negative pressure pump 4, the lower end of the circulating tank 2 is connected with the production reactor 1 through a second reflux pipe 10, a water vapor separator 5 for separating ammonia and water vapor is fixedly connected to the middle position of the connecting pipe 3, the water vapor separated after separation enters the production reactor 1 through a first reflux pipe 6 fixedly connected to the lower end of the water vapor separator 5, a stirring rod 8 is in a hollow structure and is in communication with a conveying pipe 7, and the upper surface of the stirring rod 8 is provided with an exhaust hole 9.

[0032] In the process of ammonia gas delivery, part of the ammonia gas enters the circulating tank 2 through the shunt pipe 12, at this time, under the action of the gas flow, the driving blade 11 is pushed to rotate (after the ammonia gas is returned to the connecting pipe 3 through the third return pipe 13), so that the driving blade 11 drives the stirring rod 8 to rotate, the stirring rod 8 is used to stir the dilute phosphoric acid, the reaction contact area is expanded, and at the same time, the ammonia gas is blocked by the lower baffle 14 and the upper baffle 15 during the rising process, and then passes through the through hole 16, since the positions of the through holes 16 are expanded, the rising speed of the ammonia gas can be slowed down, so that the ammonia gas and the dilute phosphoric acid can react more fully.

[0033] Embodiment three: please refer to Figure 4 In order to solve the problem of slow reaction rate caused by low reaction temperature of the traditional device, the embodiment provides the following technical scheme, and specifically discloses that the circulating tank 2 is externally fixedly installed with an annular heat preservation plate 17, the heat preservation plate 17 is internally fixedly installed with a heating pipe 18 in a spiral structure, and the heating pipe 18 is in communication with the production reaction kettle 1.

[0034] During the working process of the production reaction kettle 1, the internal heat enters the heating pipe 18, the heating pipe 18 is used to heat the circulating tank 2, so that the temperature of the dilute phosphoric acid is increased, and the high temperature can increase the reaction rate of the dilute phosphoric acid and the ammonia gas.

[0035] In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more than two;The terms "up", "down", "left", "right", "inside", "outside", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawing, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An ammonia gas recycling device for hydroxyapatite production, comprising a production reactor (1) for producing hydroxyapatite by reaction, and a recycling tank (2) provided on the side of the production reactor (1), characterized in that, Also include: The circulating tank (2) and production reactor (1) between the fixed installation of the connecting pipe (3) are communicated, and the bottom of the connecting pipe (3) is fixedly installed with negative pressure pump (4), and the lower end of the circulating tank (2) is communicated with the production reactor (1) through the second backflow pipe (10); The connecting pipe (3) is fixedly installed with a water vapor separator (5) for separating ammonia and water vapor in the middle position, and the separated water vapor enters the production reactor (1) through the first backflow pipe (6) fixedly installed at the lower end of the water vapor separator (5); The negative pressure pump (4) is installed with a conveying pipe (7) located in the circulating tank (2), and the lower end of the conveying pipe (7) is provided with a stirring mechanism for stirring to increase the ammonia absorption effect, the stirring mechanism includes a claw-shaped stirring rod (8) fixedly installed at the bottom of the conveying pipe (7).

2. The ammonia recycling device for hydroxyapatite production according to claim 1, characterized in that: The stirring rod (8) is a hollow structure and is in communication with the conveying pipe (7), and the upper surface of the stirring rod (8) is provided with an exhaust hole (9).

3. The ammonia recycling device for hydroxyapatite production according to claim 2, characterized in that: The top of the conveying pipe (7) is rotatably connected with the negative pressure pump (4), and the outer surface of the upper end of the conveying pipe (7) is fixedly installed with a driving blade (11).

4. The ammonia recycling device for hydroxyapatite production according to claim 3, characterized in that: The driving blade (11) is in height correspondence with the shunt pipe (12) and the third backflow pipe (13) fixedly installed on the upper side of the circulating tank (2), and the shunt pipe (12) and the third backflow pipe (13) are communicated with the connecting pipe (3).

5. The ammonia recycling device for hydroxyapatite production according to claim 4, characterized in that: The circulating tank (2) is fixedly installed with a lower baffle (14) and an upper baffle (15) for slowing down the flow rate of ammonia.

6. The ammonia recycling device for hydroxyapatite production according to claim 5, characterized in that: The lower baffle (14) and the upper baffle (15) are provided with through holes (16) in the inside, and the positions of the upper and lower through holes (16) are staggered.

7. The ammonia recycling device for hydroxyapatite production according to claim 6, characterized in that: The circulating tank (2) is fixedly installed with an annular heat preservation plate (17) outside, and the heat preservation plate (17) is fixedly installed with a heating pipe (18) in a spiral structure inside, and the heating pipe (18) is communicated with the production reactor (1).

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