Spiral desolventizing device and K acid continuous drying method thereof

Abstract

The invention provides a spiral desolventizing device and a K acid continuous drying method thereof, and belongs to the technical field of K acid drying. The K acid wet product is decompressed and heated through the spiral desolventizing device to complete moisture removal, the effective content of the K acid wet product can be increased to 80% from 70%, the problems that in the prior art, the content of the K acid product is low, and the product is caked are solved, and the quality of the K acid product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of K acid drying, and in particular to a spiral desolventizing device and a method for continuously drying K acid therefrom. Background Art

[0002] 2-Naphthylamine-3,6,8-trisulfonic acid (K acid) is an important dye intermediate, which can be used to synthesize a variety of azo dyes, acid dyes and organic pigments. The current industry mainly adopts the amino G acid salt and fuming sulfuric acid sulfonation process for production. The K acid obtained after sulfonation, precipitation and centrifugal filtration has a content of only 68% to 73%, a water content of about 10%, and an acidity of about 42%, which brings many inconveniences to production transportation, material storage, etc. At the same time, the material is easy to agglomerate, which brings troubles to the subsequent product application.

[0003] The spiral desolventizing device is a device that has attracted widespread attention in recent years for removing low-boiling point components in solid materials, viscous materials or liquid materials. The device is suitable for liquids, solids, liquid-solid mixtures and processes with liquid-solid phase changes. The device components also have material propulsion, material kneading and component self-cleaning functions, and are gradually playing an important role in industrial production.

[0004] Combining the characteristics of K acid products in existing production and the technical features of the spiral desolventizing device, the present invention studies a spiral desolventizing device and a method for continuously drying K acid, which is of great significance for improving the quality of K acid products. Summary of the invention

[0005] The object of the present invention is to provide a spiral desolventizing device and a method for continuous drying of K acid therefor, so as to solve the problems of low content of K acid products and product agglomeration in the prior art.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a spiral desolventizing device, comprising a feeder, a spiral desolventizing kettle body, an air chamber, a condenser, a condensate storage tank, and a discharger; a main spiral component and a secondary spiral component are arranged inside the spiral desolventizing kettle body; one end of the main spiral component and the secondary spiral component are fixedly connected to a transmission assembly; the transmission assembly comprises a transmission disk and a transmission gear, and the transmission disk and the transmission gear are meshed with each other; a heating jacket is arranged on the side of the spiral desolventizing kettle body; and the condensate storage tank is externally connected to a vacuum system.

[0008] Preferably, one end of the side of the spiral desolventizing kettle body is connected to a feeder, and the other end is connected to a discharger.

[0009] Preferably, the feeder comprises a silo, a spiral conveying component, and a star-shaped switch valve; the discharger comprises a spiral conveying component and a star-shaped switch valve.

[0010] Preferably, one end of the spiral desolventizing kettle body close to the feeder is connected to the air chamber, and the air chamber is sequentially connected to the condenser and the condensed water storage tank.

[0011] Preferably, the main helical member and the secondary helical member are co-directional differential helical members, and the differential ratio is 1 / 10 to 10 / 1.

[0012] The present invention also provides a method for continuously drying K acid using the spiral desolventizing device described above, comprising the following steps:

[0013] The pressure in the spiral desolventizing kettle is adjusted by an external vacuum system, heat medium is input into the heating jacket, and the wet K acid product is transported to the spiral desolventizing kettle through the feeder. With the mechanical rotation of the main spiral component and the auxiliary spiral component, the material is pushed to the discharger to obtain the K acid finished product.

[0014] Preferably, the pressure is -0.1 to 0 MPa.

[0015] Preferably, the temperature of the heat medium is 100-150°C.

[0016] Preferably, the K acid finished product has a content of ≥80% and a water content of ≤7%.

[0017] Beneficial effects of the present invention:

[0018] (1) The present invention inputs the produced K acid wet product into the spiral desolventizing kettle through a feeder. The K acid wet product runs axially in the spiral desolventizing kettle as the machine rotates. The moisture is removed and dried by decompression and heating. The K acid with moisture removed is moved out of the spiral desolventizing device by a discharging device to obtain a K acid finished product. The removed moisture is discharged from the spiral desolventizing kettle through the air chamber, and is condensed by the condenser and collected in a condensed water storage tank for recycling.

[0019] (2) The present invention utilizes a spiral desolventizing device to solve the problems of low K acid product content and product agglomeration in the prior art, thereby improving the quality of the K acid product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the spiral desolventizing device of the present invention, wherein 1 is a feeder, 2 is a spiral desolventizing kettle, 3 is an air chamber, 4 is a condenser, 5 is a condensed water storage tank, 6 is a transmission plate, 7 is an external motor, 8 is a discharger, and 9 is a heating jacket;

[0021] Figure 2 Schematic diagram of the structure of the feeder, where 1-1 is the silo, 1-2 is the spiral conveying component, and 1-3 is the star-shaped switch valve;

[0022] Figure 3It is a top view of the spiral desolventizing device of the present invention, wherein 1 is a feeder, 2 is a spiral desolventizing kettle body, 2-1 is a main spiral component, 2-2 is a secondary spiral component, 3 is an air chamber, 6 is a transmission disk, 6-1, 6-2, 6-3 and 6-4 are transmission gears, 7 is an external motor, 8 is a discharger, 9 is a heating jacket, 10 is a heat medium inlet, and 11 is a heat medium outlet;

[0023] Figure 4 Schematic diagram of the structure of the discharger, wherein 8-1 is a spiral transmission component, 8-2 is a star-shaped switch valve, and 12 is the outlet for the K acid finished product;

[0024] Figure 5 Schematic diagram of condensate recovery process, wherein 4 is a condenser, 13 is a refrigerant inlet, 14 is a refrigerant outlet, 5 is a condensate storage tank, 15 is an interface between the condensate storage tank and the vacuum system, and 6 is a condensate outlet. DETAILED DESCRIPTION

[0025] The present invention provides a spiral desolventizing device, comprising a feeder, a spiral desolventizing kettle body, an air chamber, a condenser, a condensate storage tank, and a discharger; a main spiral component and a secondary spiral component are arranged inside the spiral desolventizing kettle body; one end of the main spiral component and the secondary spiral component are fixedly connected to a transmission assembly; the transmission assembly comprises a transmission disk and a transmission gear, and the transmission disk and the transmission gear are meshed with each other; a heating jacket is arranged on the side of the spiral desolventizing kettle body; and the condensate storage tank is externally connected to a vacuum system.

[0026] In the present invention, the axial cross-section of the spiral desolventizing kettle body is preferably "∞"-shaped or rectangular.

[0027] In the present invention, one end of the side of the spiral desolventizing kettle body is connected to the feeder, and the other end is connected to the discharger.

[0028] In the present invention, the feeder includes a silo, a spiral conveying component, and a star-shaped switch valve; the discharger includes a spiral conveying component and a star-shaped switch valve.

[0029] In the present invention, the star-shaped switch valves are arranged at the feeder and the discharger in order to realize the continuous conveying of the materials under vacuum conditions.

[0030] In the present invention, one end of the spiral desolventizing kettle body close to the feeder is connected to the air chamber, and the air chamber is connected to the condenser and the condensed water storage tank in sequence.

[0031] In the present invention, the main helical member and the auxiliary helical member are co-directional differential helical members, and the differential ratio is 1 / 10 to 10 / 1.

[0032] In the present invention, the motion trajectory formed by any point on one spiral member orbiting around another spiral member and rotating, the motion trajectory equation is:

[0033]

[0034] Among them, R is the outer diameter of the spiral member, k is the differential ratio of the spiral member, ω is the rotation speed of a spiral member, t is the time, and a is the distance between the spiral member axes.

[0035] The present invention also provides a method for continuously drying K acid using the spiral desolventizing device described above, comprising the following steps:

[0036] The pressure in the spiral desolventizing kettle is adjusted by an external vacuum system, heat medium is input into the heating jacket, and the wet K acid product is transported to the spiral desolventizing kettle through the feeder. With the mechanical rotation of the main spiral component and the auxiliary spiral component, the material is pushed to the discharger to obtain the K acid finished product.

[0037] In the present invention, the pressure is -0.1 to 0 MPa, preferably -0.08 to -0.05 MPa, and more preferably -0.08 to 0.07 MPa.

[0038] In the present invention, the temperature of the heat medium is 100-150°C, preferably 120-140°C.

[0039] In the present invention, the K acid finished product has a content of ≥80% and a water content of ≤7%.

[0040] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0041] Example 1

[0042] The outer diameter R of the main spiral member 2-1 and the auxiliary spiral member 2-2 in the spiral desolventizing kettle 2 is 150mm, the wire diameter is 15mm, the differential speed ratio k of the spiral member is 5 / 4, the kettle length is 1000mm, and the spiral axis spacing a is 60mm. The wet K acid product (K acid content is 71.2%, water content is 16.2%) is put into the silo 1-1, and the vacuum system is turned on. The surface pressure in the spiral desolventizing kettle 2 is controlled to be -0.07Mpa, and the heat medium (temperature is 120°C) is input from the heat medium inlet 10 of the heating jacket 9, and the refrigerant (temperature is -7°C) is input from the refrigerant inlet 13 of the condenser 4. The star-shaped switch valves of the feeder 1 and the discharger 8 are opened, and the material inlet and outlet fluxes are adjusted. The rotation speed of the main spiral member is adjusted to ω=5~30rpm to ensure that the filling rate of K acid in the spiral desolventizing device is 30~60%, and the residence time of K acid in the device is controlled to be 0.2h. At the K acid finished product outlet 12, the packaging bag is connected to collect the K acid finished product. During the processing, the temperature of the heat medium at the heat medium inlet 13 is adjusted to monitor the change of the water content in the K acid finished product. After the water content in the K acid finished product reaches the established requirements and the continuous operation is stable, the K acid content and its water content are detected. The indicators of the K acid finished product detected under different material flux and heat medium inlet temperature conditions are shown in Table 1:

[0043] Table 1 K acid product indicators obtained at different material fluxes and heat medium inlet temperatures in Example 1

[0044]

[0045]

[0046] Example 2

[0047] The difference from Example 1 is that the gauge pressure in the spiral desolventizing kettle body 2 is controlled to be -0.08 MPa, and other conditions are the same.

[0048] Table 1 K acid product indicators obtained at different material fluxes and heat medium inlet temperatures in Example 2

[0049] Material throughput L / h Heat medium inlet temperature ℃ K acid content Water content 20 125 80.3％ 6.4％ 20 130 80.9％ 6.1％ 20 135 81.4％ 5.8％ 30 130 80.2％ 6.4％ 30 135 80.5％ 6.2％ 30 140 80.9％ 6.0％ 40 130 80.0％ 6.8％ 40 135 80.3％ 6.6％ 40 140 80.6％ 6.2％

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A spiral desolventizing device, characterized in that: It includes a feeder, a spiral desolventizing kettle body, an air chamber, a condenser, a condensate storage tank, and a discharger; the interior of the spiral desolventizing kettle body is provided with a main spiral component and a secondary spiral component; one end of the main spiral component and the secondary spiral component is fixedly connected to a transmission assembly; the transmission assembly includes a transmission disc and a transmission gear, and the transmission disc and the transmission gear are meshed with each other; a heating jacket is provided on the side of the spiral desolventizing kettle body; and the condensate storage tank is externally connected to a vacuum system.

2. The spiral desolventizing device according to claim 1, characterized in that: One end of the side of the spiral desolventizing kettle body is connected to a feeder, and the other end is connected to a discharger.

3. The spiral desolventizing device according to claim 2, characterized in that: The feeder comprises a material bin, a spiral conveying component, and a star-shaped switch valve; the discharger comprises a spiral conveying component and a star-shaped switch valve.

4. The spiral desolventizing device according to claim 2 or 3, characterized in that: One end of the spiral desolventizing kettle body close to the feeder is connected to the air chamber, and the air chamber is connected to the condenser and the condensed water storage tank in sequence.

5. The spiral desolventizing device according to claim 4, characterized in that: The main spiral component and the auxiliary spiral component are co-directional differential spiral components, and the differential ratio is 1 / 10 to 10 / 1.

6. A method for continuously drying K acid using the spiral desolventizing device according to any one of claims 1 to 5, characterized in that: The steps include: The pressure in the spiral desolventizing kettle is adjusted by an external vacuum system, heat medium is input into the heating jacket, and the wet K acid product is transported to the spiral desolventizing kettle through the feeder. With the mechanical rotation of the main spiral component and the auxiliary spiral component, the material is pushed to the discharger to obtain the K acid finished product.

7. The method for continuously drying K acid according to claim 5, characterized in that: The pressure is -0.1 to 0 MPa.

8. The method for continuously drying K acid according to claim 6, characterized in that: The temperature of the heat medium is 100-150°C.

9. The method for continuously drying K acid according to claim 7 or 8, characterized in that: The K acid finished product has a content of ≥80% and a water content of ≤7%.

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