Decarburizing and filtering device for vinylidene fluoride cracking gas

Abstract

The utility model relates to the technical field of fluorine-containing olefin cracking gas treatment, in particular to a carbon removing and filtering device for vinylidene fluoride cracking gas, and adopts the technical scheme that the carbon removing and filtering device for the vinylidene fluoride cracking gas mainly comprises a carbon powder filtering and collecting tank and a baffle plate filtering tower, and the baffle plate filtering tower is connected above the carbon powder filtering and collecting tank. According to the utility model, gas subjected to quenching treatment after cracking is filtered by the filter tower with the baffle plate, and coking carbon powder is collected to the carbon powder filter collection tank and discharged. The structure design is simple, carbon powder generated in the process of preparing VDF through high-temperature cracking by taking HCFC-142b as a raw material is effectively filtered, and the problems that a follow-up production system is blocked and the by-product hydrochloric acid is dark in color are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fluorine-containing olefin cracking gas processing technical field especially relates to a kind of high-temperature cracking of difluoro-chloroethane preparation vinylidene fluoride cracking gas carbon powder filtering device. BACKGROUND

[0002] Vinylidene fluoride (VDF) is one of the important monomers in fluorine chemical industry, mainly used for producing polyvinylidene fluoride (PVDF) and fluorine rubber. PVDF is a kind of thermoplastic engineering plastic with excellent comprehensive performance and wide application, mainly used in chemical equipment, electronic and electrical, piezoelectric material, lithium battery and building coating fields. Fluorine rubber obtained by copolymerization of VDF and other monomers becomes indispensable and alternative basic material in modern industry, especially in high-tech field, due to its excellent high-temperature resistance, oil resistance, solvent resistance and physical and mechanical properties.

[0003] In industry, VDF is usually prepared by high-temperature cracking process with difluoro-chloroethane (HCFC-142b) as raw material. This process has advantages of simple operation, less side reaction and high raw material conversion rate. However, due to high reaction temperature and existence of fluorine-chlorine organic by-products, coke is inevitably produced in cracking process. Reaction product gas at cracking pipe outlet is easily brought into subsequent water and alkali washing system after cooling by quenching device, causing problems such as blockage of subsequent production system and color deepening of by-product hydrochloric acid. Therefore, carbon removal operation for cracking gas is more important. UTILITY MODEL CONTENT

[0004] In view of the problems in prior art, such as coke production in cracking process due to high reaction temperature and existence of fluorine-chlorine organic by-products, reaction product gas at cracking pipe outlet is easily brought into subsequent water and alkali washing system after cooling by quenching device, causing problems such as blockage of subsequent production system and color deepening of by-product hydrochloric acid, the utility model provides a vinylidene fluoride cracking gas carbon removal filtering device.

[0005] The utility model provides the following technical scheme: a kind of vinylidene fluoride cracking gas carbon removal filtering device, including carbon powder filtering collection tank, baffle plate filter tower two parts, baffle plate filter tower is connected in carbon powder filtering collection tank top.

[0006] Preferably, the carbon powder filtering collection tank is provided with a feed inlet near the middle position, and the feed inlet can be provided with one or more.

[0007] Preferably, the carbon powder filtering collection tank is provided with an automatic flap valve below the feed inlet.

[0008] Preferably, the carbon powder filtering collection tank is provided with a pressure gauge, a thermometer installation port, and a thermometer detection pipeline laid to a middle position of the carbon powder collection tank.

[0009] Preferably, the carbon powder filtering collection tank is provided with a pressure gauge, a thermometer installation port, and a thermometer detection pipeline laid to a middle position of the carbon powder collection tank.

[0010] Preferably, the carbon powder filtering collection tank is provided with a pressure gauge, a thermometer installation port, and a thermometer detection pipeline laid to a middle position of the carbon powder collection tank.

[0011] Preferably, the carbon powder filtering collection tank is provided with a pressure gauge, a thermometer installation port, and a thermometer detection pipeline laid to a middle position of the carbon powder collection tank.

[0012] Preferably, the carbon powder filtering collection tank is provided with a pressure gauge, a thermometer installation port, and a thermometer detection pipeline laid to a middle position of the carbon powder collection tank.

[0013] Preferably, the carbon powder filtering collection tank is provided with a pressure gauge, a thermometer installation port, and a thermometer detection pipeline laid to a middle position of the carbon powder collection tank.

[0014] Preferably, the carbon powder filtering collection tank is provided with a pressure gauge, a thermometer installation port, and a thermometer detection pipeline laid to a middle position of the carbon powder collection tank.

[0015] Preferably, the carbon powder filtering collection tank is provided with a pressure gauge, a thermometer installation port, and a thermometer detection pipeline laid to a middle position of the carbon powder collection tank.

[0016] The beneficial effects of the present application are: simple structure design, effective filtration of carbon powder generated in the process of preparing VDF by high-temperature cracking of HCFC-142b as raw material, and solving the problems of subsequent production system blockage, byproduct hydrochloric acid color deepening and the like. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the present application - a vinylidene fluoride cracking gas carbon removal filter device.

[0018] Figure 2 It is a baffle plate filter tower equipment diagram.

[0019] Figure 3 It is a baffle plate filter tower pull rod position schematic diagram.

[0020] Figure 11, carbon powder collecting tank; 1-1, carbon powder filtering collecting tank body; 1-2, feeding inlet a; 1-3, pressure gauge installation opening; 1-4, thermometer installation opening; 1-5, feeding inlet b; 1-6, conical head; 1-7, hand hole; 1-8, slag discharge opening; 1-9, automatic flap; 1-10, connecting pipe; 2, baffle filtering tower; 2-1, lower baffle section; 2-2, upper baffle section; 2-3, baffle support; 2-4, baffle; 2-5, 2-7, 2-6-1, 2-6-2 are pull rods; 2-8, baffle welding angle; 2-9, exhaust port. DETAILED DESCRIPTION

[0021] The embodiments of the present application will be described in more detail with reference to the drawings and the accompanying drawings, so that those skilled in the art can implement the present application after reading the specification. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0022] Embodiment 1: A vinylidene fluoride cracking gas carbon removal filter device, comprising a carbon powder filtering collecting tank 1 and a baffle filtering tower 2, the baffle filtering tower is connected above the carbon powder filtering collecting tank 1, the upper head of the carbon powder filtering collecting tank body 1-1 adopts an oval head, and a section of connecting pipe 1-10 is welded on the opening of the upper head for connecting the baffle filtering tower 2.

[0023] The lower head 1-6 of the carbon powder filtering collecting tank adopts a conical head, and the bottom opening of the head is provided with a slag discharge opening 1-8.

[0024] A feeding inlet a 1-2 is formed at the middle position of the carbon powder filtering collecting tank 1, a pressure gauge installation opening 1-3 is arranged above the feeding inlet a 1-2, and a thermometer installation opening 1-4 is arranged above a feeding inlet b 1-5, wherein the thermometer detection pipeline is laid to the middle position of the carbon powder collecting tank 1.

[0025] An automatic flap valve 1-9 is arranged at a suitable position below the feeding inlet, the automatic flap valve 1-9 is closed when the carbon powder is cleaned through the slag discharge opening 1-8, the VDF cracking gas carbon powder filtering device can continue to work, after the cleaning is completed, the automatic flap valve 1-9 is opened, and the carbon powder filtered by the baffle is continuously collected.

[0026] The above-mentioned vinylidene fluoride cracking gas decarburization filter device can realize continuous feeding, and the gas carrying carbon powder enters the carbon powder filtering and collecting tank 1 through the feed port 1-2, then passes through the baffle plate filter tower 2, the carbon powder in the gas phase is blocked by the staggered baffle plates layer by layer and falls into the carbon powder filtering and collecting tank 1, the pressure gauge detection port 1-3 detects the pressure in the tank, and the thermometer detection port 1-4 detects the temperature in the tank; when the amount of carbon powder in the carbon powder filtering and collecting tank 1 reaches the highest level, the automatic flap 1-9 is closed, the carbon powder is cleaned through the slag discharge port 1-8, the hand hole 1-7 can assist in cleaning the carbon powder, after the carbon powder is cleaned, the automatic flap valve 1-9 is opened, the baffle plate filtered carbon powder is continuously collected, and the cracking gas with the carbon powder filtered is collected from the top of the baffle plate filter tower.

[0027] The top of the baffle plate filter tower 2 is the exhaust port 2-9, the baffle plate 2-4 and the tower wall angle 2-8 are designed to be 60°, the baffle plates 2-4 in the lower baffle section 2-1 and the upper baffle section 2-2 are staggered, each column is provided with four baffle plates 2-4, and the baffle plates 2-4 are fixed by four pull rods 2-5, 2-7, 2-6-1 and 2-6-2. Figure 3 The pull rods 2-5 and 2-7 are fixed on the baffle plate support 2-3, a support ring is arranged at the bottom of the filter tower and used for supporting the baffle plate support, the overall size of the baffle plate is 1mm-3mm smaller than the inner diameter of the filter tower, two-section baffle plate towers are connected by flanges, and the baffle plate can be freely disassembled from the baffle plate filter tower for cleaning.

[0028] The vinylidene fluoride cracking gas decarburization filter device mainly comprises the carbon powder filtering and collecting tank 1 and the baffle plate filter tower 2, and the baffle plate filter tower 2 is connected above the carbon powder filtering and collecting tank 1. The gas after cracking and rapid cooling is filtered through the filter tower with baffle plates, and the coking carbon powder is collected into the carbon powder filtering and collecting tank and discharged. The structure is simple in design, can effectively filter the carbon powder generated in the process of preparing VDF by taking HCFC-142b as raw material through high-temperature cracking, and solves the problems of blockage of a subsequent production system and deep color of byproduct hydrochloric acid

[0029] The above is one or more embodiments of the present application, which is described in detail, but should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A carbon removal and filtration device for vinylidene fluoride cracking gas, comprising two parts: a carbon powder filter collection tank (1) and a baffle plate filter tower (2), wherein the baffle plate filter tower (2) is connected above the carbon powder filter collection tank (1); The toner filter collection tank (1) is provided with an inlet near the middle position, and one or more inlets are provided; An automatic flap valve (1-9) is installed below the inlet of the carbon powder filter collection tank (1). The bottom end cap (1-6) of the toner filter collection tank (1) is conical, and the top end cap (1-1) of the toner filter collection tank (1) is designed as an elliptical end cap. A connecting pipe (1-10) is welded to the opening of the top end cap to connect to the baffle filter tower (2). The baffle plates inside the baffle filter tower (2) are installed in an alternating manner, with the baffle plates facing downwards and forming an angle of 30° to 80° with the filter tower wall.

2. The carbon removal and filtration device for vinylidene fluoride cracking gas according to claim 1, characterized in that: The carbon powder filter collection tank (1) is equipped with a pressure gauge installation port (1-3) and a thermometer installation port (1-4).

3. The carbon removal and filtration device for vinylidene fluoride cracking gas according to claim 2, characterized in that: The carbon powder filter collection tank (1) is provided with a slag discharge port (1-8) at the bottom, and the slag discharge port (1-8) is designed with an automatic discharge valve.

4. The carbon removal and filtration device for vinylidene fluoride cracking gas according to claim 1, characterized in that: The baffle filter tower (2) is a living structure with detachable baffles.

5. The carbon removal and filtration device for vinylidene fluoride cracking gas according to claim 1, characterized in that: The baffle plate is fixed together by welding four tie rods, and the overall size of the baffle plate is 1mm to 3mm smaller than the inner diameter of the filter tower.

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