Tetraethylthiuram disulfide drying system

Abstract

The utility model discloses a tetraethylthiuram disulfide drying system which comprises a blast dryer, the blast dryer comprises a drying box body, an air inlet is formed in the lower end of the drying box body, an air outlet pipe is arranged at the top end of the drying box body, a conveying belt for conveying materials is arranged in the drying box body, the air inlet is communicated with the air inlet pipe, and the air outlet pipe is communicated with the air outlet pipe. The air inlet pipe is connected with a hot air outlet of the air heater, the drying box body is provided with a coarse material discharging port connected with the double-helix mixer, the air outlet pipe of the drying box body is connected with an air inlet in the upper end of the cyclone separator, the cyclone separator is connected with the bag-type dust collector, and the bag-type dust collector is connected with a middle inlet of the water curtain machine. The water curtain machine is connected with the tail gas washing tower; the tail gas washing tower is connected with the activated carbon adsorption tower. And the drying effect is good, and environmental pollution caused in the drying process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically to a drying system for tetraethylthiuram disulfide. Background Technology

[0002] Vulcanization accelerators, often simply called accelerators, are used in rubber vulcanization to speed up the process, shorten vulcanization time, lower vulcanization temperature, and reduce the amount of vulcanizing agent required. They can also improve the physical and mechanical properties of the vulcanized rubber. Tetraethyl thiuram disulfide (TETD) is used as a super-accelerator and vulcanizing agent for natural rubber, styrene-butadiene rubber, nitrile rubber, butyl rubber, cis-butadiene rubber, and latex.

[0003] Currently, most tetraethylthiuram disulfide production processes employ a two-step method: condensation followed by oxidation. First, diethylamine, sodium hydroxide, and carbon disulfide are condensed at 30-40°C to produce sodium diethyldithiocarbamate. Then, the carbon residue is filtered, and the mother liquor is oxidized with chlorine or nitrous acid and air to produce tetraethylthiuram disulfide. After cooling, filtration, drying, and pulverization, the final product is obtained, with a yield of only 86%. While this production process is relatively mature, it suffers from significant waste, high product consumption quotas, high manual labor intensity, and a poor operating environment.

[0004] The applicant improved the process by using ethanol (including recycled ethanol), water, diethylamine, and carbon disulfide for a condensation reaction. After the reaction, hydrogen peroxide was added directly for oxidation. After the reaction, the carbon disulfide was discharged, the mixture was cooled, and the material was centrifuged for dehydration. After dehydration, the filter cake was conveyed to a dryer via a tubular chain conveyor for drying. The dried material was then mixed in a twin-screw mixer and packaged to obtain the finished product, TETD. However, small amounts of pollutants such as carbon disulfide, ethanol, and diethylamine still remain during the drying process. Direct emission of the drying exhaust gas will cause environmental pollution. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a tetraethylthiuram disulfide drying system that offers excellent drying performance, maximizes the recovery of dried products, and minimizes environmental pollution during the drying process.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a tetraethylthiuram disulfide drying system, comprising a blower dryer, the blower dryer including a drying chamber, an air inlet connected to the inner cavity of the drying chamber at the lower end of the drying chamber, an air outlet connected to the inner cavity of the drying chamber at the top end of the drying chamber, and a conveyor belt for conveying materials inside the drying chamber. The system is characterized in that: a plurality of air inlets are distributed at the lower end of the drying chamber, all air inlets are connected to an air inlet pipe, the air inlet pipe is connected to the hot air outlet of an air heater, and a coarse material outlet is provided on the drying chamber connected to a twin-screw mixer. The air outlet pipe of the housing is connected to the upper air inlet of the cyclone separator. The bottom outlet of the cyclone separator is connected to the twin-screw mixer. The top air outlet of the cyclone separator is connected to the bag filter. The bottom outlet of the bag filter is connected to the twin-screw mixer. The top air outlet of the bag filter is connected to the middle inlet of the water curtain machine via an induced draft fan. The upper part of the water curtain machine is equipped with water curtain nozzles. The bottom of the water curtain machine is equipped with a waste liquid outlet pipeline. The top of the water curtain machine is equipped with a tail gas pipeline connected to the tail gas washing tower. The gas outlet pipeline of the tail gas washing tower is connected to the activated carbon adsorption tower. The top of the activated carbon adsorption tower is equipped with an exhaust pipe.

[0007] In the above scheme: the air heater includes a housing, with an air inlet and a hot air outlet at its left and right ends, respectively. The air inlet is connected to a blower. A vertically extending steam heat exchange pipe is installed inside the housing, with its upper and lower ends connected to a low-pressure steam pipeline and a steam condensate pipe, respectively. The air is heated by the low-pressure steam entering the air heater, and the heated air then enters a blower dryer for drying.

[0008] In the above scheme: the water curtain machine has a central inlet connected to a guide tube, which is located inside the water curtain machine. The guide tube is an arc-shaped tube with its opening facing downwards, and its bottom end is provided with a flared mouth. The guide tube, along with the flared mouth at its bottom end, allows the exhaust gas to disperse as much as possible, facilitating contact with the downward-flowing water curtain and improving the treatment effect.

[0009] In the above scheme: the waste liquid outlet pipeline of the water curtain machine branches into two branch pipes, one of which is connected to the water curtain nozzle through a pump, and the other is connected to the wastewater pool.

[0010] Wet tetraethylthiuram disulfide from the centrifuge is conveyed to a blower dryer via a conveyor belt. In the blower dryer, it is dried under the uniform blowing of hot air. Coarse particles are conveyed to the coarse material outlet and then to a twin-screw mixer for mixing before being discharged. Some fine particles are carried out by an induced draft fan, first passing through a cyclone separator to separate gas and dust. The dust enters the twin-screw mixer, while the exhaust gas enters a bag filter for further separation of dust and gas. The dust then enters the twin-screw mixer, and the exhaust gas enters a water curtain machine for spray purification. Part of the spray water is returned for further spraying. Once the impurity content of the spray water is high, it is discharged into a wastewater pond.

[0011] After being cleaned by the water curtain machine, the exhaust gas enters the exhaust gas washing tower for further washing and impurity removal. Then, after the pollutants are adsorbed by the activated carbon adsorption tower, it is discharged through the vent pipe. This device can recover as much of the product carried out by the exhaust gas as possible, and at the same time, it purifies and treats the exhaust gas to reduce environmental pollution. Attached Figure Description

[0012] Figure 1 This is a process flow diagram of the present invention.

[0013] Figure 2 This is an enlarged view of the blower dryer and air heater. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Example 1: As Figure 1 and 2 As shown, the tetraethylthiuram disulfide drying system includes a blower dryer 1, which comprises a drying chamber. The lower end of the drying chamber has an air inlet 101 connected to the inner cavity of the drying chamber. Specifically, several air inlets 101 are distributed at the lower end of the drying chamber, all of which are connected to an air inlet pipe to facilitate uniform heating and drying. The top of the drying chamber has an air outlet pipe connected to the inner cavity of the drying chamber. A conveyor belt for conveying materials is installed inside the drying chamber. The air inlet pipe is connected to the hot air outlet of an air heater 2. The air heater 2 includes a chamber with an air inlet and a hot air outlet at its left and right ends, respectively. The air inlet is connected to a blower 5. A vertically extending steam heat exchanger pipe 201 is installed inside the chamber, with its upper and lower ends connected to a low-pressure steam pipeline 202 and a steam condensate pipe 203, respectively. A coarse material outlet 102 is provided on the drying chamber and connected to a twin-screw mixer 3. The material mixed by the twin-screw mixer is then packaged by an automatic packaging scale. The air outlet pipe of the drying chamber is connected to the upper air inlet of the cyclone separator 4.

[0016] The bottom outlet of the cyclone separator 4 is connected to the twin-screw mixer 3, and the top outlet of the cyclone separator 4 is connected to the bag filter 6. The bottom outlet of the bag filter 6 is connected to the twin-screw mixer 3. The top outlet of the bag filter 6 is connected to the middle inlet of the water curtain machine 8 via the induced draft fan 7. The middle inlet of the water curtain machine 8 is connected to the guide cylinder 9, which is located inside the water curtain machine 8. The guide cylinder 9 is an arc-shaped cylinder with its opening facing downwards and a flared mouth at its bottom. A water curtain nozzle 10 is installed in the upper part of the water curtain machine 8. A waste liquid outlet pipeline is installed at the bottom of the water curtain machine 8. The bottom of the water curtain machine 8 is a water storage tank with a water supply pipe 801. The waste liquid outlet pipeline at the bottom of the water curtain machine 8 branches off into two branches, one of which is connected to the water curtain nozzle 10 via a pump, and the other is connected to the wastewater tank. The top of the water curtain machine 8 is equipped with a tail gas pipeline connected to the tail gas scrubbing tower 11. The gas outlet pipeline of the tail gas scrubbing tower 11 is connected to the activated carbon adsorption tower 12. The top of the activated carbon adsorption tower 12 is equipped with an vent pipe 1201. The tail gas scrubbing tower 11 is existing technology, including a tower body. A spray head is installed in the upper part of the tower body. The tail gas enters from the middle and lower part of the tower body. The bottom of the tower body is a water storage section, equipped with a spray water outlet and a water supply pipe. A pump is connected to the spray head to supply water to the spray head. The activated carbon adsorption tower 12 is also existing technology, including a tower body filled with activated carbon. An vent pipe is installed at the top of the tower body. The water supply pipe of this utility model is equipped with a valve. An induced draft fan can be added between the tail gas scrubbing tower and the activated carbon adsorption tower, or before the tail gas scrubbing tower.

[0017] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tetraethylthiuram disulfide drying system, comprising a blast drying machine, the blast drying machine comprising a drying box body, a lower end of the drying box body being provided with an air inlet communicated with an inner cavity of the drying box body, and a top end of the drying box body being provided with an air outlet pipe communicated with the inner cavity of the drying box body, and a conveying belt for conveying materials being arranged in the drying box body, characterized in that: The lower end of the drying box is provided with several air inlets, all of which are communicated with an air inlet pipe connected with the hot air outlet of an air heater, the drying box is provided with a coarse material outlet connected with a double helix mixer, the air outlet pipe of the drying box is connected with the upper end air inlet of a cyclone separator, the bottom outlet of the cyclone separator is connected with the double helix mixer, the top air outlet of the cyclone separator is connected with a bag-type dust collector, the bottom outlet of the bag-type dust collector is connected with the double helix mixer, the top air outlet of the bag-type dust collector is connected with the middle inlet of a water curtain machine through an air guide machine, the upper part of the water curtain machine is provided with a water curtain nozzle, the bottom of the water curtain machine is provided with a waste liquid outlet pipeline, the top of the water curtain machine is provided with a tail gas pipeline connected with a tail gas water washing tower, the gas outlet pipeline of the tail gas water washing tower is connected with an activated carbon adsorption tower, and the top of the activated carbon adsorption tower is provided with a venting pipe.

2. The tetraethylthiuram disulfide drying system of claim 1, wherein: The air heater comprises a box body, air inlets and hot air outlets are arranged at the left and right ends of the box body respectively, the air inlets are connected with a blower, and steam heat exchange pipes vertically extending are arranged in the box body, the upper and lower ends of the steam heat exchange pipes are connected with a low-pressure steam pipeline and a steam condensate pipe respectively.

3. The tetraethylthiuram disulfide drying system of claim 2, wherein: The middle inlet of the water curtain machine is connected with a guide cylinder, the guide cylinder is located in the water curtain machine, the guide cylinder is an arc-shaped cylinder with an opening facing downward, and a horn mouth is arranged at the bottom end of the guide cylinder.

4. The tetraethylthiuram disulfide drying system according to any one of claims 1-3, wherein: The waste liquid outlet pipeline of the water curtain machine is divided into two branch pipes, one of which is connected with the water curtain nozzle through a pump, and the other is connected with a waste water pool.

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