High-temperature melting p-tert-butylphenol preparation system

Abstract

The utility model relates to the field of chemical production, in particular to a high-temperature molten p-tert-butylphenol preparation system which comprises a molten PTBP storage tank, a preparation tank, a solution cooler and a circulating pump, a stirring rod capable of being driven to rotate is arranged in the preparation tank, an inlet of the circulating pump is communicated with the preparation tank through an inlet pipeline, the inlet pipeline is further communicated with a PTBP feeding pipeline and a dichloromethane feeding pipeline, the other end of the PTBP feeding pipeline is used for being communicated with the molten PTBP storage tank, and the other end of the dichloromethane feeding pipeline is used for being communicated with the molten PTBP storage tank. The other end of the dichloromethane feeding pipeline is used for being communicated with a dichloromethane solution storage tank; an outlet of the circulating pump is sequentially communicated with the solution cooler and the preparation tank through an outlet pipeline; the technical problems that in the feeding process of solid PTBP, dust is large, solid materials are short in storage time and prone to caking, the labor intensity of operators is large, a solvent is volatilized in an open type feeding mode, and the working efficiency is low are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of chemical production, especially to the industrial production field of p-tert-butylphenol as solute participation configuration, polymerization reaction etc. BACKGROUND

[0002] The auxiliary material p-tert-butylphenol (also referred to as PTBP) used in the production process of polycarbonate is mainly used for adjusting the molecular weight of polymer in the polymerization process, realizing chain breaking and end capping function, so as to generate polymers with different melt indexes.

[0003] The auxiliary material configuration system uses ton packaging solid PTBP, a certain amount of solvent dichloromethane is added into the PTBP prefabricated tank in advance by using a conveying pump, the prefabricated tank is started to stir and run, a certain amount of solid PTBP packaged by a ton is added into the PTBP prefabricated tank through the top feeding opening of the PTBP prefabricated tank, and finally the PTBP / dichloromethane solution with a certain concentration is formed under the action of stirring, and is conveyed to the next process by using a centrifugal pump to participate in polymerization reaction. However, the solid packaged PTBP will be caked in the storage process, causing difficulty in feeding, and the feeding mode of directly feeding the ton into the feeding opening is relatively backward, dust is easily generated at the operation opening during the feeding process, and there is an explosion risk; dichloromethane as a solvent is a volatile medium with a boiling point of 39.8℃, and a large amount of dichloromethane is volatilized on site during the feeding process, which causes great hidden danger to the health of the on-site feeding operators, and has practical safety risks. UTILITY MODEL CONTENTS

[0004] The utility model provides a high temperature melting p-tert-butylphenol configuration system, solves the technical problems of large dust, short storage time of solid material, easy caking, large labor intensity of operators, volatilization of open feeding solvent and low operation efficiency of solid PTBP in the feeding process, improves the configuration efficiency and ensures safety.

[0005] The utility model is realized through the following technical schemes:

[0006] A high temperature melting p-tert-butylphenol configuration system comprises a melting PTBP storage tank, a configuration tank, a solution cooler and a circulating pump.

[0007] The configuration tank is provided with a stirring rod which can be driven to rotate,

[0008] The inlet of the circulating pump is communicated with the preparation tank through an inlet pipeline, and a PTBP feeding pipeline and a dichloromethane feeding pipeline are further communicated with the inlet pipeline, one end of the PTBP feeding pipeline is used for communicating with the molten PTBP storage tank, and one end of the dichloromethane feeding pipeline is used for communicating with a dichloromethane solution storage tank;

[0009] The outlet of the circulating pump is communicated with the solution cooler and the preparation tank in sequence through an outlet pipeline.

[0010] Further, a non-condensable gas cooler is further arranged and communicated with the top of the preparation tank through a circulating pipeline.

[0011] Further, the PTBP feeding pipeline and the dichloromethane feeding pipeline are both provided with a flow meter, an adjusting valve and a conveying pump.

[0012] Further, the inlet of the circulating pump is communicated with the bottom of the preparation tank through an inlet pipeline, and the outlet of the circulating pump is communicated with the solution cooler and the side wall of the preparation tank in sequence through an outlet pipeline.

[0013] Further, the molten PTBP storage tank is provided with a heating device, and the heating device is a heating coil arranged on the inner wall of the molten PTBP storage tank.

[0014] Further, an on-line concentration detector is arranged at the outlet of the outlet pipeline.

[0015] The beneficial effects obtained by the utility model compared with the prior art are as follows:

[0016] 1. The utility model discloses a molten PTBP storage tank, a preparation tank, a solution cooler and a circulating pump,

[0017] The high-temperature molten liquid PTBP is mixed with the low-temperature dichloromethane solution, the prepared material is cooled through the solution cooler, and the temperature is controlled within a certain temperature range, so that the liquid PTBP conveying, liquid preparation and pipeline closed conveying in the whole process are realized, the possibility of personnel contacting dangerous materials is eliminated, dust generation and solvent evaporation are avoided, the process preparation method is changed, the preparation efficiency is improved, and the intrinsic safety is improved.

[0018] 2. The non-condensable gas cooler is communicated with the top of the preparation tank through a circulating pipeline, and the dichloromethane vaporized due to high temperature in the preparation tank is condensed into liquid and reflows into the preparation tank.

[0019] 3. The PTBP feeding pipeline and the dichloromethane feeding pipeline are both provided with a flow meter, an adjusting valve and a conveying pump, the proportion of the two materials can be accurately adjusted, the adding amount can be proportionally adjusted and monitored.

[0020] 4. The molten PTBP storage tank is provided with a heating device to ensure that PTBP is in a molten state, facilitating transportation. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The high-temperature melting p-tert-butylphenol configuration system schematic diagram is described in the utility model.

[0022] In the figure: 1, the molten PTBP storage tank, 2, the configuration tank, 3, the solution cooler, 4, the non-condensable gas cooler, 5, the circulating pump, 6, the heating device, 7, the stirring rod, 8, the PTBP feeding pipeline, 9, the dichloromethane feeding pipeline, 10, the flow meter, 11, the online concentration detector. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] In the description of the utility model, it should be understood that the terms "front", "back", "up", "down", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the utility model.

[0025] At present, in the production process of polycarbonate, the auxiliary material PTBP is used. At present, customers can provide products in two states of solid and liquid. If solid PTBP is used for configuration, personnel directly contact dangerous materials such as dichloromethane and PTBP, and the workload and work intensity are relatively large, there are many disadvantages, and the process is backward. Therefore, we try to adjust the solid PTBP to liquid PTBP, but the main technical difficulty is that PTBP as a solute is in a liquid state when the temperature is higher than 97-98℃, and it will solidify when the temperature is lower than 97-98℃. Therefore, the normal storage temperature of liquid PTBP is about 105℃, and dichloromethane as a solvent is a low-boiling medium with a boiling point of about 39.8℃, which is extremely volatile. Therefore, it is difficult to dissolve high-temperature liquid PTBP in dichloromethane.

[0026] In order to solve the above technical problems, such as Figure 1As shown, the embodiment discloses a high-temperature molten p-tert-butylphenol preparation system, which comprises a molten PTBP storage tank 1, a preparation tank 2, a solution cooler 3, a non-condensable gas cooler 4 and a circulating pump 5. The molten PTBP storage tank 1 is used for storing liquid PTBP. In order to maintain the PTBP in a liquid state, a heating device 6 needs to be arranged in the molten PTBP storage tank 1. In the embodiment, the heating device 6 is a heating coil which is arranged on the inner wall of the molten PTBP storage tank 1 and is used for circulating high-temperature steam.

[0027] A stirring rod 7 driven by a motor is arranged in the preparation tank 2, and the side wall of the preparation tank is also connected with an output pipe for feeding the next process. The inlet of the circulating pump 5 is connected with the bottom of the preparation tank 2 through an inlet pipeline, and a PTBP feeding pipeline 8 and a dichloromethane feeding pipeline 9 are also connected with the inlet pipeline. The other end of the PTBP feeding pipeline 8 is connected with the outlet of the molten PTBP storage tank 1, and the other end of the dichloromethane feeding pipeline 9 is used for connecting a dichloromethane solution storage tank. The PTBP feeding pipeline 8 and the dichloromethane feeding pipeline 9 are both provided with a flow meter 10, an adjusting valve and a delivery pump. In this way, the liquid PTBP and the dichloromethane solution can be quantitatively input into the inlet pipeline for mixing. The outlet of the circulating pump 5 is connected with the solution cooler 3 and the side wall of the preparation tank 2 in sequence through an outlet pipeline. The solution cooler 3 can be a conventional circulating water cooler, which can cool the mixed solution and then input the cooled solution into the preparation tank 2. An on-line concentration detector 11 is arranged at the outlet of the outlet pipeline, which can detect the concentration of the solution at any time and provide a reference for subsequent feeding. The non-condensable gas cooler 4 is connected with the top of the preparation tank through a circulating pipeline, which can condense the dichloromethane vaporized due to high temperature into liquid and then return to the preparation tank 2.

[0028] The high-temperature molten p-tert-butylphenol preparation system described in the embodiment has the following working process:

[0029] The high-temperature molten PTBP and dichloromethane are added into the inlet pipeline through the PTBP feeding pipeline 8 and the dichloromethane feeding pipeline 9 at a certain flow rate for preliminary mixing. Since the temperature of the liquid PTBP is high, the solution cooler 3 is needed to cool the solution before it enters the preparation tank 2. After being circulated by the circulating pump 5 for multiple times, the PTBP / dichloromethane solution with qualified concentration is returned to the preparation tank 2. The stirring rod 7 in the preparation tank 2 needs to stir the solution to avoid the precipitation of solute due to long-term storage, so as to finally realize the preparation of the liquid PTBP. The material delivery pump arranged in the preparation tank 2 delivers the material from the output tank to the next process for participating in the polymerization reaction.

[0030] Through the above scheme, after PTBP is configured in liquid state, the possibility of direct contact of personnel with PTBP, dichloromethane and other dangerous chemicals can be completely eliminated, problems such as dust generation and solvent volatilization are avoided, the process design is changed, the configuration efficiency is improved, the occupational health and safety of operating personnel are effectively improved, and the intrinsic safety of the production process is ensured.

Claims

1. A high-temperature melting p-tert-butylphenol preparation system, characterized in that, It includes a molten PTBP storage tank, a preparation tank, a solution cooler, and a circulation pump; The configuration tank is equipped with a stirring rod that can drive rotation. The inlet of the circulating pump is connected to the configuration tank through an inlet pipe. The inlet pipe is also connected to a PTBP feeding pipe and a dichloromethane feeding pipe. The other end of the PTBP feeding pipe is used to connect to the molten PTBP storage tank, and the other end of the dichloromethane feeding pipe is used to connect to the dichloromethane solution storage tank. The outlet of the circulating pump is connected in sequence to the solution cooler and the preparation tank via an outlet pipe.

2. The high-temperature melting p-tert-butylphenol preparation system according to claim 1, characterized in that, It also includes a non-condensable gas cooler, which is connected to the top of the configuration tank via a circulation pipeline.

3. The high-temperature melting p-tert-butylphenol preparation system according to claim 1, characterized in that, Both the PTBP feeding pipeline and the dichloromethane feeding pipeline are equipped with flow meters, regulating valves, and delivery pumps.

4. The high-temperature melting p-tert-butylphenol preparation system according to claim 1, characterized in that, The inlet of the circulating pump is connected to the bottom of the preparation tank through an inlet pipe, and the outlet of the circulating pump is connected to the solution cooler and the side wall of the preparation tank in sequence through an outlet pipe.

5. The high-temperature melting p-tert-butylphenol preparation system according to any one of claims 1-4, characterized in that, The molten PTBP storage tank is equipped with a heating device, which is a heating coil installed on the inner wall of the molten PTBP storage tank.

6. The high-temperature melting p-tert-butylphenol preparation system according to any one of claims 1-4, characterized in that, An online concentration detector is installed at the outlet of the outlet pipeline.

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