A device for treating aqueous waste rubber generated by producing lyocell fibers

Abstract

The utility model provides a device for treating aqueous waste rubber generated by producing lyocell fibers, comprising an aqueous waste rubber conveying unit, a granulating unit, a soaking unit, a centrifuge, and a vibrating fluidized bed, which are arranged in sequence. The device treats water and NMMO in aqueous waste rubber generated by producing lyocell fibers, so that the water content in the obtained waste rubber particles is significantly reduced, and the NMMO is recovered. Experimental results show that the water content in the treated waste rubber is 10-12%, and the mass concentration of NMMO in the soaking liquid after the waste rubber particles are soaked twice is 0.1%-0.3%.

Description

Technical Field

[0001] The utility model belongs to the technical field of post-processing of lyocell fibers, and in particular relates to a device for processing aqueous waste rubber generated in the production of lyocell fibers. Background Art

[0002] Lyocell fiber is a renewable cellulose fiber prepared by directly dissolving cellulose pulp in an aqueous solution of N-methyl-N-morpholine oxide (NMMO) to form a spinning solution, and then dry-jet wet spinning.

[0003] During the production process of lyocell fiber, waste rubber liquid is generated. The waste rubber liquid contains a large amount of water and a certain amount of NMMO. The moisture content is about 60-70%. Due to the high moisture content, it is not conducive to the subsequent treatment and recycling of the waste rubber, which increases the treatment cost. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a device for treating aqueous waste rubber generated in the production of lyocell fibers, which can reduce the moisture content of the aqueous waste rubber and recover NMMO.

[0005] The utility model provides a device for processing aqueous waste rubber generated by producing lyocell fibers, comprising aqueous waste rubber conveying units arranged in sequence;

[0006] Granulation unit;

[0007] Soaking unit;

[0008] Centrifuge;

[0009] Vibrating fluid bed.

[0010] In a specific embodiment, an air input port, a waste rubber particle input port, a waste rubber particle output port and an air induced outlet are arranged on the vibrating fluidized bed.

[0011] In a specific embodiment, the induced air outlet is connected to the soaking unit via an induced air fan.

[0012] In a specific embodiment, the aqueous waste rubber conveying unit is provided with an aqueous waste rubber input port and an aqueous waste rubber output port.

[0013] In one embodiment, the granulation unit comprises a first granulation unit connected to the aqueous scrap rubber conveying unit;

[0014] A second granulation unit is connected to the first granulation unit.

[0015] In one specific embodiment, the particle size of the granules obtained by the first granulation unit is 25 to 30 meshes;

[0016] The particle size of the granules obtained by the second granulation unit is 10 to 15 meshes.

[0017] In a specific embodiment, the soaking liquid used in the soaking unit is steam condensed water.

[0018] In one embodiment, the soaking unit comprises a first soaking unit connected to the second granulation unit;

[0019] A second soaking unit connected to the first soaking unit.

[0020] The utility model provides a device for treating aqueous waste rubber generated by producing lyocell fibers, comprising an aqueous waste rubber conveying unit, a granulating unit, a soaking unit, a centrifuge, and a vibrating fluidized bed, which are arranged in sequence. The device treats water and NMMO in aqueous waste rubber generated by producing lyocell fibers, so that the water content in the obtained waste rubber particles is significantly reduced, and the NMMO is recovered. Experimental results show that the water content in the treated waste rubber is 10-12%, and the mass concentration of NMMO in the soaking liquid after the waste rubber particles are soaked twice is 0.1%-0.3%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a device for treating aqueous waste rubber generated by producing lyocell fibers provided by the utility model;

[0022] Figure 2 This is a schematic diagram of a device for treating aqueous waste rubber generated by producing lyocell fibers used in the specific implementation of the utility model;

[0023] Figure 3 It is a schematic diagram of the connection between the vibrating fluidized bed and other components in the utility model. DETAILED DESCRIPTION

[0024] The utility model provides a device for processing aqueous waste rubber generated by producing lyocell fibers, comprising aqueous waste rubber conveying units arranged in sequence;

[0025] Granulation unit;

[0026] Soaking unit;

[0027] Centrifuge;

[0028] Vibrating fluidized bed.

[0029] The utility model provides a device for processing aqueous waste rubber generated by producing lyocell fibers, comprising an aqueous waste rubber conveying unit, wherein an aqueous waste rubber input port and an aqueous waste rubber output port are arranged on the aqueous waste rubber conveying unit. The aqueous waste rubber comprises 11-13 wt% of α-cellulose, 74-76 wt% of NMMO and the remainder of water.

[0030] The utility model provides a device for processing aqueous waste rubber generated by the production of lyocell fibers, comprising a granulation unit connected to the aqueous waste rubber conveying unit; the granulation unit granulates the aqueous waste rubber; the granulation unit comprises a granulator. In a specific embodiment, the granulation unit comprises a first granulation unit connected to the aqueous waste rubber conveying unit; and a second granulation unit connected to the first granulation unit. In the utility model, the granulation unit crushes and granulates the aqueous waste rubber, so that NMMO in the waste rubber is easier to precipitate during the subsequent soaking treatment. The utility model granulates the waste rubber particles in steps, which can save costs on the one hand and improve the recovery rate of NMMO in the rubber solution on the other hand. In the utility model, the particle size of the rubber particles obtained by the first granulation unit is 25 to 30 meshes; the particle size of the rubber particles obtained by the second granulation unit is 10 to 15 meshes.

[0031] The utility model provides a device for processing aqueous waste rubber generated by producing lyocell fibers, comprising a soaking unit connected to the granulation unit; the soaking unit is preferably a soaking tank; the soaking liquid used by the soaking unit is steam condensed water; the soaking unit can recover NMMO in the waste rubber.

[0032] The soaking unit in the utility model includes a first soaking unit connected to the second granulation unit; and a second soaking unit connected to the first soaking unit. The soaking liquid used in the first soaking unit is steam condensed water, the temperature of one soaking is 30-45°C, and the time of one soaking is 30-60 minutes; the first soaking can recover NMMO in the aqueous waste rubber. The soaking liquid used in the second soaking unit is steam condensed water, the temperature of the second soaking is 30-45°C, and the time of the second soaking is 30-60 minutes; the second soaking can further recover NMMO in the aqueous waste rubber.

[0033] After soaking, the waste rubber particles are transported to the centrifuge together with the soaking liquid through a centrifugal pump.

[0034] The utility model provides a device for processing aqueous waste rubber generated by producing lyocell fibers, comprising a centrifuge connected to the soaking unit; the centrifuge recovers part of the solution on the waste rubber particles through centrifugal energy; the solution comprises water and NMMO.

[0035] The utility model provides a device for treating aqueous waste rubber generated by producing lyocell fibers, which comprises a vibrating fluidized bed, which is not only conducive to removing water, but also conducive to the subsequent recovery of NMMO solvent; the vibrating fluidized bed dries the waste rubber particles after centrifugation, and also discharges wet air into the water of a secondary soaking tank, so that NMMO can be further recovered.

[0036] See also Figure 3The vibrating fluidized bed is provided with an air input port, a waste rubber particle input port, a waste rubber particle output port and an induced draft outlet. An air filter, a blower and an air heater are connected to the air input port in sequence. The induced draft outlet is led out by the induced draft fan and then leads into the soaking tank.

[0037] The waste rubber particles obtained are then packed in bags and sold. The water content of the waste rubber particles treated by the above device is 10-12%.

[0038] In order to further illustrate the utility model, a device for treating aqueous waste rubber generated by producing lyocell fibers provided by the utility model is described in detail below in conjunction with embodiments, but they should not be construed as limiting the protection scope of the utility model.

[0039] Example 1

[0040] The aqueous waste rubber produced by the production of lyocell fibers is conveyed to a granulator, wherein the aqueous waste rubber includes 11-13% α-cellulose, 74-76% NMMO, and the rest is water; the aqueous waste rubber is subjected to a first granulation to obtain aqueous waste rubber particles of 25 meshes, and then subjected to a second granulation to obtain aqueous waste rubber particles of 10 meshes;

[0041] The water-containing waste rubber particles with a particle size of 10 mesh are immersed in steam condensate (the mass ratio of the water-containing waste rubber particles to the steam condensate is 1:20) at 35-40° C. for 10 minutes, and then immersed in steam condensate at 35-40° C. for 10 minutes, to recover NMMO in the waste rubber particles;

[0042] The waste rubber particles after the second soaking are centrifuged in a centrifuge to recover the solution on the particles;

[0043] The waste rubber particles after centrifugation are placed in a vibrating fluidized bed. The conditions of the vibrating fluidization are: vibration motor power 1.5kw, vibration amplitude 1mm, temperature 60℃, residence time 5min. The waste rubber particles are dried, and the wet air is discharged into the water of the secondary soaking tank to further recover NMMO.

[0044] Example 2

[0045] The aqueous waste rubber produced by the production of lyocell fibers is conveyed to a granulator, wherein the aqueous waste rubber includes 11-13% α-cellulose, 74-76% NMMO, and the rest is water; the aqueous waste rubber is subjected to a first granulation to obtain aqueous waste rubber particles of 30 meshes, and then subjected to a second granulation to obtain aqueous waste rubber particles of 15 meshes;

[0046] The water-containing waste rubber particles with a particle size of 15 mesh are immersed in steam condensate (the mass ratio of the water-containing waste rubber particles to the steam condensate is 1:20) at 35-40° C. for 10 minutes, and then immersed in steam condensate at 35-40° C. for 10 minutes, to recover NMMO in the waste rubber particles;

[0047] The waste rubber particles after the second soaking are centrifuged in a centrifuge to recover the solution on the particles;

[0048] The waste rubber particles after centrifugation are placed in a vibrating fluidized bed. The conditions of the vibrating fluidization are: vibration motor power 1.5kw, vibration amplitude 2mm, temperature 55℃, residence time 5min. The waste rubber particles are dried, and the wet air is discharged into the water of the secondary soaking tank to further recover NMMO.

[0049] Example 3

[0050] The aqueous waste rubber produced by the production of lyocell fibers is conveyed to a granulator, wherein the aqueous waste rubber includes 11-13% α-cellulose, 74-76% NMMO, and the rest is water; the aqueous waste rubber is subjected to a first granulation to obtain aqueous waste rubber particles of 25 meshes, and then subjected to a second granulation to obtain aqueous waste rubber particles of 15 meshes;

[0051] The water-containing waste rubber particles with a particle size of 15 mesh are immersed in steam condensate (the mass ratio of the water-containing waste rubber particles to the steam condensate is 1:20) at 35-40° C. for 10 minutes, and then immersed in steam condensate at 35-40° C. for 10 minutes, to recover NMMO in the waste rubber particles;

[0052] The waste rubber particles after the second soaking are centrifuged in a centrifuge to recover the solution on the particles;

[0053] The waste rubber particles after centrifugation are placed in a vibrating fluidized bed. The conditions of the vibrating fluidization are: vibration motor power 1.2kw, vibration amplitude 1.5mm, temperature 55℃, residence time 5min. The waste rubber particles are dried, and the wet air is discharged into the water of the secondary soaking tank to further recover NMMO.

[0054] The test data of NMMO content and moisture content in the process of treating aqueous waste rubber in the above-mentioned Examples 1 to 3 of the present invention are shown in Table 1:

[0055] Table 1 Content of NMMO and water in Examples 1 to 3

[0056]

[0057] It can be seen from the above embodiments that the utility model provides a device for treating aqueous waste rubber generated by the production of lyocell fibers, comprising an aqueous waste rubber conveying unit; a granulating unit; a soaking unit; a centrifuge; and a vibrating fluidized bed, which are arranged in sequence. The above device treats water and NMMO in aqueous waste rubber generated by the production of lyocell fibers, so that the water content in the obtained waste rubber particles is significantly reduced, and NMMO is recovered. The experimental results show that the water content of the waste rubber particles after the vibrating fluidized bed treatment is 10-12%, and the mass concentration of NMMO in the soaking liquid after the waste rubber particles are soaked twice is 0.1%-0.3%.

[0058] 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 protection scope of the present invention.

Claims

1. A device for treating aqueous waste rubber generated by producing lyocell fibers, characterized in that: It includes water-containing waste rubber conveying units arranged in sequence; Granulation unit; Soaking unit; Centrifuge; Vibrating fluidized bed.

2. The aqueous waste rubber treatment device according to claim 1, characterized in that: The vibrating fluidized bed is provided with an air input port, a waste rubber particle input port, a waste rubber particle output port and an air induced outlet port.

3. The aqueous waste rubber treatment device according to claim 2, characterized in that: The induced air outlet is connected to the soaking unit through an induced air fan.

4. The aqueous waste rubber treatment device according to claim 1, characterized in that: The water-containing waste rubber conveying unit is provided with a water-containing waste rubber input port and a water-containing waste rubber output port.

5. The aqueous waste rubber treatment device according to claim 1, characterized in that: The granulation unit comprises a first granulation unit connected to the aqueous waste rubber conveying unit; A second granulation unit is connected to the first granulation unit.

6. The aqueous waste rubber treatment device according to claim 5, characterized in that: The particle size of the granules obtained by the first granulation unit is 25 to 30 meshes; The particle size of the granules obtained by the second granulation unit is 10 to 15 meshes.

7. The aqueous waste rubber treatment device according to claim 1, characterized in that: The soaking liquid used in the soaking unit is steam condensed water.

8. The aqueous waste rubber treatment device according to claim 5, characterized in that: The soaking unit includes a first soaking unit connected to the second granulation unit; A second soaking unit connected to the first soaking unit.

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