Online viscosity detection device for polycarbonate diol

Abstract

The utility model discloses a polycarbonate diol on-line viscosity detection device which comprises a detection cup, the detection cup is provided with a feeding and discharging channel communicated with a reaction kettle, and a feeding and discharging valve is arranged on the feeding and discharging channel; a thermometer and a viscometer are arranged in the detection cup; the detection cup is provided with a pressure adjusting unit for controlling the internal pressure of the detection cup, and feeding and discharging of materials in the detection cup are controlled through the pressure difference. According to the device, the viscosity of chemical materials can be detected on line under the condition that production is not stopped when the chemical materials are produced at high temperature.

Description

Technical Field

[0001] The utility model relates to the field of chemical production, in particular to an online viscosity detection device for polycarbonate diol. Background Art

[0002] When chemical materials are produced at high temperatures, the viscosity of the materials needs to be tested. The existing testing method can only be used for sampling and analysis after production. Especially when producing polycarbonate diol, due to the high production temperature of polycarbonate diol, the viscosity cannot be measured online. Sampling and analysis after producing a batch of products takes a lot of time. At the same time, affected by the batch of raw materials and the ambient temperature, the viscosity of each product will be different under the same process conditions. Utility Model Content

[0003] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides an online viscosity detection device for polycarbonate diol, which can realize online detection of the viscosity of chemical materials without stopping production during high-temperature production, especially during the production of polycarbonate diol.

[0004] Specifically, the utility model provides an online viscosity detection device for polycarbonate diol, which is used for high-temperature production of chemical materials. The device includes a detection cup,

[0005] The detection cup is provided with an inlet and outlet channel connected to the reaction kettle, and an inlet and outlet valve is provided on the inlet and outlet channel;

[0006] The detection cup is provided with a thermometer and a viscometer;

[0007] The detection cup is provided with a pressure regulating unit for controlling the internal pressure of the detection cup (the inflow and outflow of materials in the detection cup are controlled by the pressure difference).

[0008] Optionally, a temperature control layer is provided on the periphery of the inlet and outlet channels.

[0009] Optionally, a heat-insulating layer or a temperature-controlling layer is provided on the periphery of the detection cup.

[0010] Optionally, a liquid level gauge linked to the discharge valve is provided inside the detection cup, and the installation height of the liquid level gauge is adjustable.

[0011] Optionally, the pressure regulating unit includes a vacuum valve, a vacuum pump connected to the vacuum valve, and a nitrogen filling device, and the vacuum valve is installed on the upper part of the detection cup.

[0012] Optionally, the bottom of the test cup is a hole-shaped one, and the bottom corners are rounded.

[0013] Preferably, the chemical material is polycarbonate diol.

[0014] The utility model has the following advantages:

[0015] The polycarbonate diol online viscosity detection device of the utility model is reasonably designed and ingeniously structured, and can realize online detection of the viscosity of chemical materials without stopping production when chemical materials are produced at high temperature.

[0016] The polycarbonate diol online viscosity detection device is cleverly provided with a temperature control layer, which is a temperature regulating interlayer. By using medium heating, the material can be quickly heated or cooled to a set temperature through the temperature regulating interlayer, thereby shortening the viscosity detection time.

[0017] At the same time, the reasonable design of the liquid level meter and the inlet and outlet valves can effectively control the amount of polycarbonate diol entering the test; and different types of viscometers can be selected according to the situation, so that the detection range can reach 1-10 million mpa.s. The bottom of the test cup is reasonably designed to be a hole-shaped and the bottom corners are rounded, which can effectively discharge the test polycarbonate diol without accumulating residues.

[0018] The feeding or discharging of the detection cup relies on the pressure regulating unit to form positive pressure or negative pressure in the detection cup. When the detection cup is fed, a vacuum negative pressure is formed in the detection cup, so that the pressure in the detection cup is lower than the pressure in the reactor, and the material enters the detection cup under the action of the pressure difference; when the detection cup is discharged, the pressure regulating unit box is filled with nitrogen in the detection cup, so that the pressure in the detection cup is higher than the pressure in the reactor, and the material is discharged to the reactor through the action of the pressure difference; nitrogen is used because it is an inert gas and will not affect the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of connecting the polycarbonate diol online viscosity detection device with a reaction kettle;

[0020] Figure 2 is a structural schematic diagram of the polycarbonate diol online viscosity detection device;

[0021] Figure 3 It is a schematic diagram of the use process of the polycarbonate diol online viscosity detection device;

[0022] In the figure: 100, reactor, 200, polycarbonate diol online viscosity detection device, 11, inlet and outlet channels, 12, inlet and outlet valves, 13, temperature control layer, 14, thermometer, 15, viscometer, 16, liquid level gauge, 17, detection cup, 18, insulation layer, 19, vacuum valve. DETAILED DESCRIPTION

[0023] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0024] In this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0025] As described in the background technology, when chemical materials are produced at high temperatures, the viscosity of the materials needs to be tested. The existing testing methods can only be used for sampling and analysis after production. In particular, when producing polycarbonate diols, the viscosity cannot be measured online due to the high production temperature of polycarbonate diols. Sampling and analysis after producing a batch of products takes a lot of time. At the same time, affected by the batch of raw materials and the ambient temperature, the viscosity of each product will be different under the same process conditions.

[0026] Therefore, based on the above problems, this embodiment provides a polycarbonate diol online viscosity detection device 200, which is suitable for high-temperature production of polycarbonate diol, such as Figure 1 and Figure 2 As shown, the device includes a detection cup,

[0027] The detection cup 17 is provided with an inlet and outlet channel 11 communicating with the reaction kettle 200, and an inlet and outlet valve 12 is provided on the inlet and outlet channel 11;

[0028] The detection cup is provided with a thermometer 14 and a viscometer 15;

[0029] The detection cup 17 is provided with a pressure regulating unit for controlling the internal pressure of the detection cup, and the inflow and outflow of materials in the detection cup 17 are controlled by the pressure difference.

[0030] The above technical features are reasonably designed and ingeniously structured, and can realize online detection of the viscosity of the material without stopping the production when the polycarbonate diol is produced at high temperature.

[0031] Since the temperature of polycarbonate diol is high when it enters the detection cup from the reactor, it is not convenient to detect the viscosity. Therefore, in order to cool down the polycarbonate diol, in one embodiment, a temperature control layer 13 is provided on the periphery of the inlet and outlet channel 11, and an insulation layer 18 or a temperature control layer 13 is provided on the periphery of the detection cup 17; the temperature of the polycarbonate diol can be controlled by the temperature control effect, and the polycarbonate diol can be cooled when it enters the detection cup from the reactor; and when the polycarbonate diol enters the reactor from the detection cup, the polycarbonate diol can be heated, and the influence on the normal processing in the reactor can be reduced by heating. Specifically, the temperature control layer is a temperature regulating interlayer, which utilizes medium heating. Through the temperature regulating interlayer, the material can be quickly heated or cooled to the set temperature, thereby shortening the viscosity detection time.

[0032] In order to better control the amount of material entering the detection cup, in one embodiment, a liquid level gauge 16 linked to the discharge valve 12 is provided inside the detection cup 17; in order to adapt to different situations, the installation height of the liquid level gauge is adjustable.

[0033] In order to adjust the pressure in the detection cup, in one embodiment, the pressure regulating unit includes a vacuum valve 19, a vacuum pump connected to the vacuum valve, and a nitrogen filling device, and the vacuum valve 19 is installed on the upper part of the detection cup 17. When the detection cup is fed, a vacuum negative pressure is formed in the detection cup, so that the pressure in the detection cup is less than the pressure in the reactor, and the material enters the detection cup under the action of the pressure difference; when the detection cup is discharged, the pressure regulating unit box is filled with nitrogen in the detection cup, so that the pressure in the detection cup is greater than the pressure in the reactor, and the material is discharged to the reactor through the action of the pressure difference; nitrogen is used because nitrogen is an inert gas and can not affect the material.

[0034] When the polycarbonate diol online viscosity detection device detects the viscosity of the polycarbonate diol, Figure 2 and Figure 3As shown, when the polycarbonate diol production reaches the polycondensation stage and viscosity test is required, the vacuum valve 19 is opened to evacuate the air. After reaching the specified vacuum degree, the vacuum valve 19 is closed, the inlet and outlet valves 12 are opened, the temperature control layer is started to cool the inlet and outlet channels 11, and the insulation layer 18 is started to cool the test cup 17. When the polycarbonate diol to be tested reaches the liquid level gauge 16, the inlet and outlet valves 12 are closed, the vacuum valve 19 is opened to introduce nitrogen to normal pressure, and the temperature detected by the thermometer 14 reaches the required temperature. The temperature control layer 13 and the insulation layer 18 are cooled to insulation, and the viscometer 15 is started for detection. After the detection, the viscometer 15 is stopped, the temperature regulating interlayer 13 and the insulation layer 18 are started to heat up, the inlet and outlet valves 12 are opened, and the vacuum valve 19 is opened to fill nitrogen. When the pressure of the test cup 17 to be tested fluctuates, the heating function of the temperature control layer 13 and the insulation layer 18 is turned off, the vacuum valve 19 is closed to stop filling nitrogen, and the inlet and outlet valves 12 are closed; thereby completing an online viscosity detection.

[0035] The polycarbonate diol online viscosity detection device can realize online viscosity detection without stopping production when the polycarbonate diol production reaches the polycondensation stage, which is convenient for the staff to adjust the process in time according to the viscosity and improve the production stability and quality of the product.

[0036] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Polycarbonate diol online viscosity detection device, characterized in that: When used for high temperature production of chemical materials, the device includes a detection cup, The detection cup is provided with an inlet and outlet channel connected to the reaction kettle, and an inlet and outlet valve is provided on the inlet and outlet channel; The detection cup is provided with a thermometer and a viscometer; The detection cup is provided with a pressure regulating unit for controlling the internal pressure of the detection cup.

2. The polycarbonate diol online viscosity detection device according to claim 1, characterized in that: A temperature control layer is arranged on the periphery of the inlet and outlet channels.

3. The polycarbonate diol online viscosity detection device according to claim 1, characterized in that: A heat preservation layer or a temperature control layer is arranged on the periphery of the detection cup.

4. The polycarbonate diol online viscosity detection device according to claim 1, characterized in that: A liquid level gauge linked to the discharge valve is arranged inside the detection cup, and the installation height of the liquid level gauge is adjustable.

5. The polycarbonate diol online viscosity detection device according to claim 1, characterized in that: The pressure regulating unit comprises a vacuum valve, and the vacuum valve is installed on the upper part of the detection cup.

6. The polycarbonate diol online viscosity detection device according to any one of claims 1 to 5, characterized in that: The chemical material is polycarbonate diol.

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