Organic silicon slurry residue drying system

Abstract

The utility model discloses an organic silicon slurry residue drying system which comprises a drying device, a gas-phase substance separation device, a gas-phase substance separation device, a gas-phase substance separation device, a gas-phase substance separation device and a gas-phase substance separation device, and the drying device is used for receiving organic silicon slurry residues, drying the organic silicon slurry residues and separating the organic silicon slurry residues into solid-phase substances and gas-phase substances; the spray cooling tower is connected to the drying device and is used for receiving the gas-phase substance generated by the drying device and at least partially absorbing the gas-phase substance through spray liquid; the washing pump is connected to the spray cooling tower and is used for receiving spray liquid discharged by the spray tower; and the cooler is connected to the spray cooling tower and the washing pump and is used for cooling the spray liquid provided by the washing pump and then providing the spray liquid to the spray cooling tower.

Description

Technical Field

[0001] The utility model relates to chemical equipment, in particular to an organosilicon slurry residue drying system. Background Art

[0002] During the production of organosilicon, crude monomer products are produced at the same time as slurry. Organosilicon slurry contains organosilicon monomer and silicon powder, of which the liquid phase is mainly disilane and high-boiling mixture, and the solid phase is mainly silicon powder. Since organosilicon monomer reacts with water to produce hydrogen chloride, hydrogen chloride combines with water in the air to form hydrochloric acid, which is very corrosive. At the same time, the monomer reacts with water to produce hydrolyzate, which has a low flash point, is highly corrosive, and produces colloids, which are very easy to clog equipment. In terms of the solid phase, the Mohs hardness of metallic silicon is 9.5 (the Mohs hardness of diamond is 10), which leads to the fact that in industrial production, where metallic silicon exists, the seals of the equipment are easily worn, resulting in leakage.

[0003] Therefore, there is an urgent need to develop an organosilicon slurry drying system to dry the organosilicon slurry so as to separate the solid phase and liquid phase of the organosilicon slurry. Utility Model Content

[0004] The utility model aims to provide an organosilicon slurry drying system, which solves at least one of the above-mentioned technical problems.

[0005] The utility model solves the technical problem by adopting the following technical solution: an organosilicon slurry drying system, which comprises:

[0006] A drying device, the drying device is used to receive the organosilicon slurry, dry the organosilicon slurry, and separate it into a solid phase substance and a gas phase substance;

[0007] A spray cooling tower, the spray cooling tower is connected to the drying device, and is used to receive the gas phase substance generated by the drying device and absorb the gas phase substance at least partially by spraying liquid;

[0008] A washing pump, the washing pump is connected to the spray cooling tower and is used to receive the spray liquid discharged from the spray tower;

[0009] A cooler is connected to the spray cooling tower and the washing pump, and is used for cooling the spray liquid provided by the washing pump and then providing it to the spray cooling tower.

[0010] Optionally, the drying device comprises:

[0011] A cylinder, the cylinder comprising a feed port, a discharge port and an exhaust port, the feed port is used to receive the organosilicon slurry, the discharge port is used to discharge the solid phase material, and the exhaust port is used to discharge the gas phase material;

[0012] A stirrer, the stirrer is disposed in the cylinder and is used to stir the organosilicon slurry; and

[0013] A heating device is used to heat the organic silicon slurry residue in the cylinder.

[0014] Optionally, the heating device includes a jacket, which is arranged on the outside of the cylinder and has a containing space between the jacket and the cylinder, wherein the containing space is connected to a liquid inlet and a liquid outlet so that high-temperature fluid enters the containing space through the liquid inlet and is discharged from the liquid outlet.

[0015] Optionally, the agitator includes a rotating shaft and a paddle connected to the rotating shaft, wherein a liquid flow path is provided on the rotating shaft and the paddle, and the liquid flow path on the rotating shaft is connected to the liquid flow path of the paddle to provide high-temperature flow to the liquid flow path on the rotating shaft and the liquid flow path of the paddle.

[0016] Optionally, a gas phase filter is provided on the cylinder, one end of the gas phase filter is communicated with the exhaust port, and the other end of the gas phase filter is connected to the spray cooling tower.

[0017] Optionally, the gas phase filter is provided with an air inlet, and the air inlet is connected to a nitrogen supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the organosilicon slurry drying system of the utility model.

[0019] The markings in the figure are as follows: 1-drying device; 11-cylinder; 12-agitator; 13-feeding pipeline; 14-discharge pipeline; 15-rotary joint; 16-double-end mechanical seal; 17-gas phase filter; 2-spray cooling tower; 3-washing pump; 4-cooler. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further described below in conjunction with the embodiments and drawings.

[0021] Example 1

[0022] This embodiment provides an organosilicon slurry drying system, which includes: a drying device 1, a spray cooling tower 2, a washing pump 3 and a cooler 4.

[0023] The drying device 1 is used to receive the organic silicon slurry, dry the organic silicon slurry, and separate it into solid phase matter and gas phase matter; the spray cooling tower 2 is connected to the drying device 1, and is used to receive the gas phase matter generated by the drying device 1, and at least partially absorb the gas phase matter through the spray liquid; the washing pump 3 is connected to the spray cooling tower 2, and is used to receive the spray liquid discharged by the spray tower; the cooler 4 is connected to the spray cooling tower 2 and the washing pump 3, and is used to cool the spray liquid provided by the washing pump 3 and then provide it to the spray cooling tower 2.

[0024] Preferably, the drying device 1 comprises a barrel 11, an agitator 12 and a heating device; the barrel 11 comprises a feed port, a discharge port and an exhaust port, the feed port is used to receive the organic silicon slurry, the discharge port is used to discharge the solid phase material, and the exhaust port is used to discharge the gas phase material; wherein the axis of the barrel 11 is arranged horizontally, the opening of the feed port is arranged upward, the discharge port opening is arranged downward, and the exhaust port is arranged upward.

[0025] The feed port is connected to a feed pipeline 13, on which a plug feed valve is provided, and the feed amount is adjusted by the plug feed valve. The discharge port is connected to a discharge pipeline 14, on which a switch valve is provided, and the discharge of the solid phase material is achieved by opening the switch valve.

[0026] The heating device includes a jacket, which is arranged outside the barrel 11 and has a receiving space between the jacket and the barrel 11, wherein the receiving space is connected with a liquid inlet and a liquid outlet, so that the high-temperature fluid enters the receiving space through the liquid inlet and is discharged from the liquid outlet. In addition, the barrel 11 is equipped with an insertion thermometer to measure the temperature of the internal material.

[0027] The stirrer 12 is rotatably disposed in the cylinder 11 and is used to stir the organic silicon slurry; one end of the stirrer is fixedly connected to the reducer through a coupling, and the other end is connected to a rotary joint. The reducer drives the stirrer 12 to rotate through the coupling, ensuring that the drying device 1 can continuously turn the organic silicon slurry during the continuous input of the organic silicon slurry to increase its heat drying efficiency, and at the same time, the dried slurry can be pushed to the discharge port to ensure that the dried material (solid phase material) is discharged to the dry material discharge system.

[0028] The agitator 12 includes a stirring shaft and a paddle connected to the stirring shaft, wherein the stirring shaft and the paddle are both provided with a liquid flow path, and the liquid flow path on the stirring shaft is connected to the liquid flow path of the paddle to provide high-temperature flow to the liquid flow path on the stirring shaft and the liquid flow path of the paddle, thereby forming a hollow heating tube inside the agitator 12 of this embodiment.

[0029] The stirrer 12 is provided with a rotary joint 15, which is a jacketed type and is connected to the stirring shaft of the stirrer 12 by bolts. At the same time, two joints are provided to connect the heat transfer oil inlet and outlet pipes.

[0030] At the same time, double-end mechanical seals 16 are provided at both ends of the stirring shaft. The addition of coolant ensures that the double-end mechanical seals 16 will not be heated to high temperatures, and also ensures that the materials in the drying device 1 will not come into contact with the external air and react.

[0031] The cylinder 11 is provided with a gas phase filter 17, one end of which is connected to the exhaust port, wherein the other end of the gas phase filter 17 is connected to the spray cooling tower 2. The gas phase filter 17 is provided with an air inlet, which is connected to a nitrogen supply device, so that the gas phase filter 17 can filter the dried dust, and the high-pressure nitrogen provided by the nitrogen supply device can backwash the gas phase filter 17, that is, backwash the dust deposited on the surface of the filter element.

[0032] In the production process of organosilicon synthesis equipment, the treatment of slurry residue has become a key environmental protection issue in the organosilicon industry. The traditional practice in the industry is to send the slurry residue to the water washing system for direct water washing and deactivation, and then the deactivated material is processed in the next step. This not only wastes resources, but also generates hydrogen chloride during the water washing process, which poses a challenge to the environment. However, this organosilicon slurry residue drying system can effectively evaporate and separate the liquid monomers in the organosilicon slurry residue, achieve full separation of the slurry residue solid phase and the slurry residue liquid phase, recycle the liquid phase, and reduce the output of by-products in the organosilicon production process.

[0033] The organic silicon slurry drying system equipment of the utility model has a wide range of applications, can realize negative pressure operation, and can also realize positive pressure operation. The operating pressure of the equipment is -90KPa-30KPa. The equipment has good temperature resistance and can be operated at a temperature of 350°C. The stirring shaft and the blades of the stirrer are hollow and heated, which fully ensures the separation effect of the slurry drying while reducing the drying time. The mechanical sealing effect is good, the leakage rate is low, and the drying continuity is high. A filter is arranged at the gas phase outlet to prevent dust from being brought into the gas phase system. The filter is provided with hot nitrogen backblowing to prevent the filter from being blocked. Liquid spraying is adopted to cool the gas phase material to improve the cooling efficiency.

[0034] In actual application, the slurry to be dried continuously enters the interior of the cylinder through a feeder, and the cylinder is a jacketed type; the stirrer is longitudinally distributed with staggered stirring teeth, and the paddles are driven by a reducer to stir and rotate. During the stirring and rotating process, the slurry in the cylinder can be continuously scraped to make the slurry flip along the fixed stirring direction. At the same time, the cylinder cleaning teeth fixed on the cylinder are chelated with the paddles to clean the deposited materials on the paddles, so that there is no dead angle during the stirring and heating process of the material to prevent the material from agglomerating; the stirring shaft and the paddles are hollow inside, and hot oil is introduced through a rotary joint for heating so that the slurry is heated evenly during the stirring process; at the same time, the stirring rotation rate can be adjusted by adjusting the speed of the reducer. The faster the speed, the shorter the drying stroke of the slurry; the heated silicone monomer vapor is filtered by a gas phase filter and sent to a subsequent spray cooling tower, and the gas phase filter is intermittently backblown with hot nitrogen from the hot nitrogen port. The spray liquid generated by the spray cooling tower passes through the washing pump and the cooler and enters the top of the tower for spray cooling; and the dried slurry is transported along the cylinder to the discharge port under the stirring of the agitator and is discharged into the collector.

[0035] The mechanical seal between the stirring shaft and the cylinder adopts double-end seal. The shaft sleeve material of the seal is generally made of corrosion-resistant and wear-resistant materials. The sealing gasket is generally made of high-temperature resistant materials above 350°C. Before the material is heated up, the double-end seal needs to be supplemented with lubricating cooling oil through the oil seal tank to prevent the double-end seal from being damaged by high temperature. At the same time, the jacket is cooled by circulating the seal oil through water.

[0036] The order of the above embodiments is only for the convenience of description and does not represent the advantages or disadvantages of the embodiments.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An organosilicon slurry drying system, characterized in that: include: A drying device, the drying device is used to receive the organosilicon slurry, dry the organosilicon slurry, and separate it into a solid phase substance and a gas phase substance; A spray cooling tower, the spray cooling tower is connected to the drying device, and is used to receive the gas phase substance generated by the drying device and absorb the gas phase substance at least partially by spraying liquid; A washing pump, the washing pump is connected to the spray cooling tower and is used to receive the spray liquid discharged from the spray tower; A cooler is connected to the spray cooling tower and the washing pump, and is used for cooling the spray liquid provided by the washing pump and then providing it to the spray cooling tower.

2. The organosilicon slurry drying system according to claim 1, characterized in that: The drying device comprises: A cylinder, the cylinder comprising a feed port, a discharge port and an exhaust port, the feed port is used to receive the organosilicon slurry, the discharge port is used to discharge the solid phase material, and the exhaust port is used to discharge the gas phase material; A stirrer, the stirrer is disposed in the cylinder and is used to stir the organosilicon slurry; and A heating device is used to heat the organic silicon slurry residue in the cylinder.

3. The organosilicon slurry drying system according to claim 2, characterized in that: The heating device includes a jacket, which is arranged on the outside of the cylinder and has a storage space between the jacket and the cylinder, wherein the storage space is connected to a liquid inlet and a liquid outlet so that high-temperature fluid enters the storage space through the liquid inlet and is discharged from the liquid outlet.

4. The organosilicon slurry drying system according to claim 2, characterized in that: The agitator includes a rotating shaft and a paddle connected to the rotating shaft, wherein the rotating shaft and the paddle are both provided with a liquid flow path, and the liquid flow path on the rotating shaft is connected to the liquid flow path of the paddle to provide high-temperature flow to the liquid flow path on the rotating shaft and the liquid flow path of the paddle.

5. The organosilicon slurry drying system according to claim 2, characterized in that: A gas phase filter is arranged on the cylinder, one end of the gas phase filter is communicated with the exhaust port, wherein the other end of the gas phase filter is connected with the spray cooling tower.

6. The organosilicon slurry drying system according to claim 5, characterized in that: The gas phase filter is provided with an air inlet, and the air inlet is connected to a nitrogen supply device.

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