Closed cycle drying system for para aminobenzoic acid

Abstract

The utility model provides a closed cycle drying system for para aminobenzoic acid. The closed cycle drying system comprises a filter, a gas heater, a vibration fluidized dryer, a feeder, a cyclone separator, an air blower and a condenser, according to the utility model, a closed-loop circulating drying system is adopted, so that the possibility of oxidative deterioration and crystal form damage of a product is reduced, the obtained product has better crystal form and appearance, and the quality of the product is improved; the labor amount is reduced, zero emission is basically achieved, the environmental influence is reduced, the production cost of the product is reduced, and the market competitiveness of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical reaction equipment, and in particular to a closed-circuit circulation drying system for p-aminobenzoic acid. Background Art

[0002] Para-aminobenzoic acid is a white needle-shaped monoclinic prism with a melting point of 187-189°C and a relative density of 1.374 (25 / 4°C). It is soluble in boiling water, alcohol, ether, ethyl acetate and glacial acetic acid, slightly soluble in water and benzene, and insoluble in petroleum ether. The pH value of a 5% solution is 3.5. It is easily oxidized and turns yellow when exposed to air or light, so the commercially available product is often a light brown crystal.

[0003] Para-aminobenzoic acid has a wide range of uses. Para-aminobenzoic acid is a newly discovered water-soluble B vitamin that can be naturally synthesized in the human body. Para-aminobenzoic acid mainly comes from animal liver, kidney, brewer's yeast, unrefined grain products, milk, beef heart, beef liver, eggs, lean meat, soybeans, peanuts, malt, molasses, etc. The main functions of para-aminobenzoic acid: 1. It helps in the synthesis of folic acid, which plays an important role in the body's use of protein; 2. It helps the body absorb pantothenic acid, and combined with pantothenic acid can restore the natural color of hair; 3. It reduces the stinging sensation of burns and scalds; 4. It keeps the skin healthy and lubricated; 5. It delays wrinkling; 6. It blocks sunlight and is widely used in sunscreen products.

[0004] In some high-end application fields, the market has high requirements for the appearance of p-aminobenzoic acid, requiring it to be white needle-shaped monoclinic prisms with uniform crystal size and aspect ratio. In the process of drying p-aminobenzoic acid, the crystals of commonly used drying equipment, such as double cone dryers, are severely damaged as the double cones rotate and the materials flip up and down, and the quality is difficult to meet the market requirements. The disc drying oven can well maintain the crystal form of p-aminobenzoic acid, but the loading and unloading of the disc drying oven consumes a lot of labor, and it is difficult to produce continuously. There is a lot of dust on the production site, and the production efficiency is low, which is difficult to meet the needs of mass production.

[0005] Based on many years of research and experiments, we have proposed a closed-loop drying system for p-aminobenzoic acid, which consists of a filter, a gas heater, a vibrating fluidized bed dryer, a feeder, a cyclone separator, a blower, a condenser, etc. The drying system uses nitrogen as the drying gas to avoid oxidation and discoloration of the material during high-temperature drying. Under the action of the blower, the drying gas is filtered by the filter and heated by the gas heater, and then enters the vibrating fluidized bed dryer. After heat and mass transfer, it carries the solvent in the material into the cyclone separator for gas-solid separation. The separated drying gas enters the blower for pressurization, enters the condenser for cooling and solvent recovery, and is then sent to the filter for recycling. The material is sent to the feed port of the vibrating fluidized bed dryer through the feeder outlet. After passing the vibrating fluidized bed drying, it is discharged through the vibrating fluidized bed dryer outlet and enters the packaging process together with the material obtained by cyclone separation. Utility Model Content

[0006] In response to the technical problems raised above, a closed-loop circulation drying system for p-aminobenzoic acid is provided.

[0007] The technical means adopted by the utility model are as follows:

[0008] A closed-loop drying system for p-aminobenzoic acid comprises a filter (100), a gas heater (200), a vibrating fluidized bed dryer (300), a feeder (400), a cyclone separator (500), a blower (600), and a condenser (700); the filter (100) is provided with a filter air inlet (101) and a filter air outlet (102); the gas heater (200) is provided with a heater air inlet (201) and a heater air outlet (202);

[0009] The vibrating fluidized bed dryer (300) is provided with a housing (301), a support (302), a dryer feed port (303), a dryer discharge port (304), a plurality of dryer air inlets (305), a plurality of dryer air outlets (306), a nitrogen inlet (307), a vibrating motor (308), and a sight glass (309); a vibration isolator (302-1) is connected between the housing (301) and the support (302);

[0010] The feeder (400) is provided with a feeder inlet (401) and a feeder outlet (402).

[0011] The cyclone separator (500) is provided with a separator air inlet (501), a separator air outlet (502), a solid material discharge port (503) and an exhaust port (504).

[0012] The blower (600) is provided with a blower air inlet (601) and a blower air outlet (602).

[0013] The condenser (700) is provided with a condenser air inlet (701) and a condenser air outlet (702);

[0014] The filter air outlet (102) is connected to the heater air inlet (201), the heater air outlet (202) is connected to the dryer air inlet (305), the dryer air outlet (306) is connected to the separator air inlet (501), the separator air outlet (502) is connected to the blower air inlet (601), the blower air outlet (602) is connected to the condenser air inlet (701), the feeder discharge port (402) is connected to the dryer feed port (303), and the condenser air outlet (702) is connected to the filter air inlet (101).

[0015] Furthermore, the air outlet (102) of the filter (100) is connected to the air inlet (305) of the vibration fluidized bed dryer (300).

[0016] Furthermore, the number of the dryer air inlets is 3 to 5, and the number of the dryer air outlets is 3 to 5.

[0017] Furthermore, the filter air outlet (102) is connected to a dryer air inlet (305) close to the dryer discharge port (304).

[0018] Furthermore, the box body (301) is made of 316L stainless steel.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The utility model adopts a closed-circuit circulation drying system, which reduces the possibility of product oxidation deterioration and crystal damage. The obtained product has a good crystal form and appearance, improves product quality, reduces labor, basically achieves zero emissions, reduces environmental impact, reduces product production costs, and improves product market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The utility model provides a schematic structural diagram of a closed-loop circulation drying system for p-aminobenzoic acid.

[0023] Figure 2 This is a structural schematic diagram of the vibrating fluidized bed dryer provided by the utility model.

[0024] In the figure: 100, filter; 200, gas heater; 300, vibrating fluidized bed dryer; 400, feeder; 500, cyclone separator; 600, blower; 700, condenser; 201, heater air inlet; 202, heater air outlet; 301, housing; 302, support; 303, dryer feed inlet; 304, dryer outlet; 305, dryer air inlet; 306, dryer outlet; 307, nitrogen inlet; 308, vibrating motor; 309, sight glass; 401, feeder feed inlet; 402, feeder outlet; 501, separator air inlet; 502, separator air outlet; 503, solid material outlet; 504, exhaust port; 601, blower air inlet; 602, blower outlet. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction 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 of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0029] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0032] like Figures 1-2 As shown, the utility model provides a closed-loop circulation drying system for p-aminobenzoic acid, comprising a filter (100), a gas heater (200), a vibrating fluidized bed dryer (300), a feeder (400), a cyclone separator (500), a blower (600), and a condenser (700); the filter (100) is provided with a filter air inlet (101) and a filter air outlet (102), and the gas heater (200) is provided with a heater air inlet (201) and a heater air outlet (202);

[0033] The vibrating fluidized bed dryer (300) is provided with a housing (301), a support (302), a dryer feed port (303), a dryer discharge port (304), a plurality of dryer air inlets (305), a plurality of dryer air outlets (306), a nitrogen inlet (307), a vibrating motor (308), and a sight glass (309); a vibration isolator (302-1) is connected between the housing (301) and the support (302);

[0034] The feeder (400) is provided with a feeder inlet (401) and a feeder outlet (402).

[0035] The cyclone separator (500) is provided with a separator air inlet (501), a separator air outlet (502), a solid material discharge port (503) and an exhaust port (504).

[0036] The blower (600) is provided with a blower air inlet (601) and a blower air outlet (602).

[0037] The condenser (700) is provided with a condenser air inlet (701) and a condenser air outlet (702);

[0038] The filter air outlet (102) is connected to the heater air inlet (201), the heater air outlet (202) is connected to the dryer air inlet (305), the dryer air outlet (306) is connected to the separator air inlet (501), the separator air outlet (502) is connected to the blower air inlet (601), the blower air outlet (602) is connected to the condenser air inlet (701), the feeder discharge port (402) is connected to the dryer feed port (303), and the condenser air outlet (702) is connected to the filter air inlet (101).

[0039] The air outlet (102) of the filter (100) is connected to the air inlet (305) of the vibration fluidized bed dryer (300).

[0040] The number of the dryer air inlets is 3 to 5, and the number of the dryer air outlets is 3 to 5.

[0041] The filter air outlet (102) is connected to a dryer air inlet (305) close to the dryer discharge port (304).

[0042] The box body (301) is made of 316L stainless steel.

[0043] The working principle of the utility model is as follows: the drying gas is filtered by the filter (100) and heated by the gas heater (200) under the action of the blower (600), and then enters the vibrating fluidized bed dryer (300). After heat and mass transfer, the drying gas carries the solvent in the material into the cyclone separator (500) for gas-solid separation. The separated drying gas enters the blower (600) for pressurization, enters the condenser (700) for cooling and solvent recovery, and then is sent to the filter (100) for recycling. The undried p-aminobenzoic acid wet product enters the feeder (400) through the feeder feed port (401), is sent to the dryer feed port (303) through the feeder discharge port (402), and is discharged from the dryer discharge port (304) of the vibrating fluidized bed dryer (300) after passing the vibrating fluidized bed drying. The filter outlet (102) of the filter (100) is connected to the dryer air inlet (305) of the vibrating fluidized bed dryer (300), and unheated nitrogen is introduced near the dryer outlet (304) to cool the material before discharge, thereby preventing the material from being oxidized and deteriorated due to long-term high temperature.

[0044] The utility model can realize automatic, closed and continuous operation, saves manpower, has high production capacity, and is safe and environmentally friendly.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A closed-circuit drying system for p-aminobenzoic acid, characterized in that: The invention comprises a filter (100), a gas heater (200), a vibrating fluidized bed dryer (300), a feeder (400), a cyclone separator (500), a blower (600), and a condenser (700); the filter (100) is provided with a filter air inlet (101) and a filter air outlet (102); the gas heater (200) is provided with a heater air inlet (201) and a heater air outlet (202); The vibrating fluidized bed dryer (300) is provided with a housing (301), a support (302), a dryer feed port (303), a dryer discharge port (304), a plurality of dryer air inlets (305), a plurality of dryer air outlets (306), a nitrogen inlet (307), a vibrating motor (308), and a sight glass (309); a vibration isolator (302-1) is connected between the housing (301) and the support (302); The feeder (400) is provided with a feeder inlet (401) and a feeder outlet (402). The cyclone separator (500) is provided with a separator air inlet (501), a separator air outlet (502), a solid material discharge port (503) and an exhaust port (504). The blower (600) is provided with a blower air inlet (601) and a blower air outlet (602). The condenser (700) is provided with a condenser air inlet (701) and a condenser air outlet (702); The filter air outlet (102) is connected to the heater air inlet (201), the heater air outlet (202) is connected to the dryer air inlet (305), the dryer air outlet (306) is connected to the separator air inlet (501), the separator air outlet (502) is connected to the blower air inlet (601), the blower air outlet (602) is connected to the condenser air inlet (701), the feeder discharge port (402) is connected to the dryer feed port (303), and the condenser air outlet (702) is connected to the filter air inlet (101).

2. A closed-circuit drying system for p-aminobenzoic acid according to claim 1, characterized in that: The air outlet (102) of the filter (100) is connected to the air inlet (305) of the vibration fluidized bed dryer (300).

3. A closed-circuit drying system for p-aminobenzoic acid according to claim 1 or 2, characterized in that: The number of the dryer air inlets is 3 to 5, and the number of the dryer air outlets is 3 to 5.

4. A closed-circuit drying system for p-aminobenzoic acid according to claim 1 or 2, characterized in that: The filter air outlet (102) is connected to a dryer air inlet (305) close to the dryer discharge port (304).

5. A closed-circuit drying system for p-aminobenzoic acid according to claim 1 or 2, characterized in that: The box body (301) is made of 316L stainless steel.

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