CN212167418U - Raw material blending device for continuous nylon salification - Google Patents
Raw material blending device for continuous nylon salification Download PDFInfo
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- CN212167418U CN212167418U CN202020542025.5U CN202020542025U CN212167418U CN 212167418 U CN212167418 U CN 212167418U CN 202020542025 U CN202020542025 U CN 202020542025U CN 212167418 U CN212167418 U CN 212167418U
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Abstract
The utility model relates to a raw material blending device for nylon continuous salifying, wherein a dibasic acid rotary discharge valve is arranged at the bottom of a dibasic acid stock bin, the outlet of the dibasic acid rotary discharge valve is connected with the feed inlet of a dibasic acid slurry blending tank, and the rotating speed is controlled by the liquid level of the dibasic acid slurry blending tank; the top of the dibasic acid slurry blending tank is provided with a spraying column, the top of the spraying column is provided with an exhaust elbow, the upper part of the spraying column is provided with a nozzle, a water supply pipeline of the nozzle is connected with a pure water supply pipe through a dibasic acid blending pure water flowmeter and a dibasic acid blending pure water control valve, an inner cavity of the dibasic acid slurry blending tank is provided with a frame type stirrer, a bottom outlet of the water supply pipeline is connected with an inlet of a dibasic acid slurry delivery pump, a dibasic acid slurry on-line densimeter and a dibasic acid slurry flowmeter are installed on a dibasic acid slurry supply pipe at an outlet of the dibasic acid slurry delivery pump and are connected with a dibasic acid inlet of a primary salt forming tank, and the dibasic acid blending pure water flowmeter is controlled by the dibasic acid slurry on-line. The device can avoid blocking and the measurement is accurate.
Description
Technical Field
The utility model relates to a nylon salify device in succession especially relates to a nylon salify's raw materials blending device in succession, belongs to nylon production facility technical field.
Background
Most of nylon polymers are prepared from diamine and dibasic acid as raw materials, pure water as a carrier, and are subjected to neutralization reaction to produce a nylon salt aqueous solution, and then nylon polymers are generated by polymerization, wherein the nylon polymers comprise nylon 56, nylon 66, nylon 1010, nylon 1012, nylon 6T, nylon 9T, nylon 10T, nylon 5T and the like. Salification is an essential process of the polymerization device, and the continuous and stable addition of the dibasic acid and the diamine is crucial.
The salt formation is a process of neutralization reaction of diamine and dibasic acid, the reaction requires that materials must react in an equal molar ratio, and the proportion requirement on the materials is very high. The salt-forming process comprises an intermittent process and a continuous process, the diamine raw material state comprises a solid (powder or flake) state and a liquid state, and the diacid state is generally a solid state.
Conventional batch processes: the method has the advantages of low automation degree, high working strength, easy misoperation, inaccurate measuring precision and large difference of operation batches because the method is directly put into the device after manual subpackage measurement. Often, multiple fine-tuning operations are required to achieve the desired batch.
The traditional continuous process: at present, diamine purchased in the market is liquid, and the diamine is used in a nylon 66 and nylon 56 salifying device with solid powder as dibasic acid, so that the method is not suitable for a mode that two materials are solid. The solid powder is influenced by a metering mode, an external environment and the like, and cannot be accurately metered, meanwhile, because the temperature of the salt forming reaction is higher (the raw materials are different, and the reaction temperature is between 50 and 95 ℃), the water vapor amount in the salt forming kettle is larger, the dibasic acid solid is directly added into the salt forming kettle, and the dibasic acid at a feed opening can be accumulated after meeting the water vapor, so that the blockage is caused, and the stable production of the device is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the problem that exists among the prior art, provide a raw materials blending device of nylon salification in succession, can improve the accuracy of measurement, can avoid blockking up, improve the stability of device under the condition that two kinds of raw materials are the solid.
In order to solve the technical problem, the utility model discloses a nylon raw materials allotment device that salifies continuously, including the dibasic acid feed bin, the bottom discharge gate of dibasic acid feed bin is equipped with the rotatory bleeder valve of dibasic acid, and the export of the rotatory bleeder valve of dibasic acid links to each other with the dog-house of dibasic acid thick liquids allotment jar through the dibasic acid feeding pipe, and the rotational speed of the rotatory bleeder valve of dibasic acid is controlled by the liquid level of dibasic acid thick liquids allotment jar; the top of the dibasic acid slurry mixing tank is provided with an upwardly extending spraying column, the top of the spraying column is provided with an exhaust bent pipe, the upper part of the spraying column is provided with a nozzle, a water supply pipeline of the nozzle is connected with a pure water supply pipe through a dibasic acid mixed pure water flowmeter and a dibasic acid mixed pure water control valve, and the opening degree of the dibasic acid mixed pure water control valve is controlled by the dibasic acid mixed pure water flowmeter; a frame type stirrer is arranged in the inner cavity of the binary acid slurry mixing tank, the outlet at the bottom of the binary acid slurry mixing tank is connected with the inlet of a binary acid slurry delivery pump, and the outlet of the binary acid slurry delivery pump is connected with the binary acid inlet of the primary salt forming tank through a binary acid slurry supply pipe; the binary acid slurry supply pipe is provided with a binary acid slurry on-line densimeter and a binary acid slurry flow meter, and the binary acid blending pure water flow meter is controlled by the binary acid slurry on-line densimeter.
Compared with the prior art, the utility model discloses following beneficial effect has been obtained: the dibasic acid is conveyed into a dibasic acid bin in an automatic conveying mode, the rotary discharge valve of the dibasic acid rotates to quantitatively convey the dibasic acid into the dibasic acid slurry mixing tank, and the input amount of the dibasic acid is adjusted according to the liquid level fluctuation in the dibasic acid slurry mixing tank. The dibasic acid slurry blending tank mixes dibasic acid and pure water according to a certain proportion at normal temperature in advance, and the frame type stirrer stirs and mixes the mixture into turbid liquid of the dibasic acid and the water. The top of the binary acid slurry mixing tank is provided with the spraying column, and the exhaust bent pipe is arranged at the top of the spraying column, so that the settling height of dust is increased, and the dust in the exhaust gas is sprayed and washed by pure water and falls back to the binary acid slurry mixing tank. The prepared dibasic acid slurry is conveyed into a primary salt forming tank by a dibasic acid slurry conveying pump through a dibasic acid slurry supply pipe, the density of the dibasic acid slurry is measured by a dibasic acid slurry online densimeter, the concentration of the dibasic acid slurry is calculated, and the calculated concentration is provided for a dibasic acid prepared pure water flowmeter; if the concentration of the dibasic acid slurry is lower, the opening degree of the dibasic acid-prepared pure water control valve is reduced, and the proportion of the dibasic acid and the pure water is ensured to meet the requirement; meanwhile, the flow is accurately measured by a binary acid slurry flow meter.
As the improvement of the utility model, the bottom of dibasic acid feed bin is equipped with nitrogen gas blowback device, the lower part of dibasic acid dog-house is equipped with nitrogen gas blowout mouth, nitrogen gas blowback device all links to each other with nitrogen gas air supply pipe through the nitrogen gas valve with nitrogen gas blowout mouth. The nitrogen is blown out from the nitrogen back-blowing device, so that the dibasic acid can be prevented from hardening or bridging at the bottom of the storage bin, and the dibasic acid can be ensured to fall smoothly. The nitrogen is periodically introduced into the nitrogen blowing opening at the lower part of the dibasic acid feeding pipe, so that the feed openings of the dibasic acid feeding pipe and the dibasic acid slurry mixing tank can be further kept smooth.
As a further improvement of the utility model, still include the diamine kettle of melting in advance, the periphery of diamine kettle of melting in advance is equipped with premelting kettle heating jacket, the inner chamber of diamine kettle of melting in advance is equipped with frame agitator and premelting kettle heating coil, the bottom of diamine kettle of melting in advance is equipped with diamine clearance bleeder valve, the export of diamine clearance bleeder valve links to each other through the top entry of diamine dog-house and diamine storage tank, the inner chamber of diamine storage tank is equipped with diamine storage tank heating coil, the bottom discharge gate of diamine storage tank links to each other with the entry of diamine delivery pump, the exit linkage of diamine delivery pump has the diamine supply pipe, the diamine entry of one-level salification groove links to each other with the diamine supply pipe through one-level diamine flowmeter and one-level diamine control valve. The general diamine has a low melting point, for example, the melting point of the sunflower diamine is 62 ℃, the melting point of the pentamethylene diamine is 9 ℃, the melting point of the hexamethylene diamine is 39-43 ℃, the melting point of the dodecane diamine is 67-69 ℃, the solid diamine is firstly fed into a diamine pre-melting kettle in an automatic conveying mode, steam from a steam pipe enters a heating jacket of the pre-melting kettle and a heating coil of the pre-melting kettle to heat the solid diamine, the solid diamine is pre-melted into a liquid state, and the problem that the sheet diamine material is difficult to accurately measure and convey in the continuous production process is solved. A frame type stirrer is arranged in the diamine premelting kettle for stirring, a certain amount of mother liquor is reserved during each batch of reaction, a solid melting material and a liquid material are quickly melted under the stirring action, the melted materials are put into a diamine storage tank for storage at intervals under the action of a position difference through a diamine gap discharge valve, and a steam pipe supplies steam to a heating coil of the diamine storage tank to keep the temperature of the diamine. The liquid diamine is delivered by a diamine delivery pump and is delivered into a primary salt forming tank through a diamine feeding pipe, the flow of the diamine is accurately measured by a primary diamine flow meter, the opening degree of a primary diamine control valve is accurately controlled, and the diacid and the diamine with equal molar ratio react to form salt in the primary salt forming tank.
As a further improvement of the utility model, a top pure water inlet of the primary salt forming tank is connected with a pure water supply pipe through a primary salt forming tank water replenishing pipe, a primary salt forming pure water flow meter and a primary salt forming pure water control valve are installed on the primary salt forming tank water replenishing pipe, and the opening degree of the primary salt forming pure water control valve is controlled by the primary salt forming pure water flow meter; one-level salifying bleeder valve is installed to the bottom in one-level salt bath, and the export of one-level salifying bleeder valve links to each other with the entry of one-level salt liquid delivery pump, and the export of one-level salt liquid delivery pump passes through the salt liquid entry that one-level salt liquid output tube and second grade salifying groove and links to each other, installs the online densimeter of one-level salt liquid and the online pH meter of one-level salt liquid on the one-level salt liquid output tube, and one-level salifying pure water flowmeter is controlled by the online densimeter of one-level. The primary salt forming tank water replenishing pipe replenishes a proper amount of pure water into the primary salt forming tank through a primary salt forming pure water flowmeter and a primary salt forming pure water control valve, so that primary salt forming is kept at a proper concentration. The salt solution in the primary salt forming tank enters a primary salt solution conveying pump through a primary salt forming discharge valve, the primary salt solution conveying pump conveys the salt solution into a secondary salt forming tank through a primary salt solution output pipe, and the pH value of the primary salt solution is measured by a primary salt solution on-line pH meter; the online densimeter of the primary salt solution measures the density of the primary salt solution, calculates the concentration of the primary salt solution, and provides the concentration to the primary salt-forming pure water flowmeter, if the concentration of the primary salt solution is higher, the primary salt-forming pure water control valve increases the opening; if the concentration of the primary salt solution is lower, the opening of the primary salt-forming pure water control valve is reduced, and the concentration of the primary salt solution is accurately controlled.
As a further improvement, the diamine inlet of the secondary salt formation tank is connected with the diamine supply pipe through a secondary diamine flowmeter and a secondary diamine control valve, the opening degree of the secondary diamine control valve is controlled by the secondary diamine flowmeter, and the secondary diamine flowmeter is controlled by the one-level salt solution on-line pH meter. The concentration and the pH value of the primary salt solution are basically and accurately adjusted, and the primary salt solution enters a secondary salt forming tank for continuous reaction and further accurate adjustment of the concentration and the pH value of the salt solution. Because the dibasic acid slurry is turbid liquid, the interval addition is easy to settle in a pipeline to cause blockage, the diamine in the primary salt forming tank is in a negative error state, and the pH value of the secondary salt forming tank is adjusted by adding the diamine. When the pH value of the primary salt solution is lower than a set value, the secondary diamine flow meter controls the secondary diamine control valve to increase the opening degree, and more diamine is supplemented into the secondary salt forming tank; when the pH value of the primary salt solution is higher than a set value, the secondary diamine flow meter controls the secondary diamine control valve to reduce the opening degree, and the secondary salt forming tank reduces the supplement amount of diamine, so that the pH value of the secondary salt solution can be accurately controlled.
As a further improvement of the utility model, a top pure water inlet of the secondary salifying tank is connected with a pure water supply pipe through a secondary salifying tank water supplementing pipe, a secondary salifying pure water flow meter and a secondary salifying pure water control valve are installed on the secondary salifying tank water supplementing pipe, and the opening degree of the secondary salifying pure water control valve is controlled by the secondary salifying pure water flow meter; the second grade salifying bleeder valve is installed to the bottom in second grade salt groove, and the export of second grade salifying bleeder valve links to each other with the entry of second grade salt liquid delivery pump, and the exit linkage of second grade salt liquid delivery pump has second grade salt liquid output tube, installs the online densimeter of second grade salt liquid and the online pH meter of second grade salt liquid on the second grade salt liquid output tube, and second grade salifying pure water flowmeter is controlled by the online densimeter of second grade salt liquid. And a secondary salt forming tank water replenishing pipe replenishes a proper amount of pure water into the secondary salt forming tank through a secondary salt forming pure water flowmeter and a secondary salt forming pure water control valve, so that secondary salt forming is kept at a proper concentration. The salt solution in the secondary salt forming tank enters a secondary salt solution delivery pump through a secondary salt forming discharge valve, the secondary salt solution delivery pump sends out through a secondary salt solution output pipe, and the secondary salt solution on-line pH meter measures the pH value of the secondary salt solution; the secondary salt solution on-line densimeter measures the density of the secondary salt solution, calculates the concentration of the secondary salt solution, and provides the concentration to a secondary salt-forming pure water flowmeter, if the concentration of the secondary salt solution is higher, the opening of the secondary salt-forming pure water control valve is increased; and if the concentration of the secondary salt solution is lower, the opening of the secondary salt-forming pure water control valve is reduced, and the concentration of the secondary salt solution is accurately controlled.
As a further improvement, the diamine feeding pipe, the diamine supply pipe, the first-level salt solution output pipe and the second-level salt solution output pipe are jacket heating pipelines.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.
FIG. 1 is a flow chart of the raw material blending device for nylon continuous salt formation of the present invention.
In the figure: 1. a dibasic acid bin; 1a, a nitrogen back-blowing device; 2. a binary acid slurry blending tank; 2a, spraying a column; 3. a diamine pre-melting kettle; 4. a diamine storage tank; 5. a first-stage salt forming tank; 6. a secondary salt forming tank; v1, a binary acid rotary discharge valve; v2, a purified water control valve for preparing dibasic acid; v3. diamine gap discharge valve; v4. primary diamine control valve; v5. primary salt-forming pure water control valve; v6. primary salifying discharge valve; v7. a secondary diamine control valve; v8. secondary salt-forming pure water control valve; v9. secondary salifying discharge valve; G1. a dibasic acid feeding pipe; G2. a dibasic acid slurry supply pipe; G3. a diamine feeding pipe; G4. a diamine supply pipe; G5. a first-level salt solution output pipe; G6. a secondary salt solution output pipe; G7. a steam pipe; G8. a condensate pipe; w0. a pure water supply pipe; w1, a water replenishing pipe of a primary salt forming tank; w2, a secondary salifying tank water replenishing pipe; n1. nitrogen gas supply pipe; F1. preparing a pure water flow meter by using dibasic acid; F2. a flow meter for the binary acid slurry; F3. a primary diamine flow meter; F4. a primary salifying pure water flowmeter; F5. a secondary diamine flow meter; F6. a secondary salt-forming pure water flowmeter; B1. a binary acid slurry delivery pump; B2. a diamine delivery pump; B3. a first-level salt solution delivery pump; B4. a secondary salt solution delivery pump; D1. a dibasic acid slurry on-line densimeter; D2. a first-level salt solution online densimeter; D3. a secondary salt solution on-line densimeter; p1, a primary salt solution online pH meter; and P2, an online pH meter of the secondary salt solution.
Detailed Description
As shown in fig. 1, the utility model discloses raw materials blending device of nylon continuous salification includes dibasic acid feed bin 1, and the bottom discharge gate of dibasic acid feed bin 1 is equipped with rotatory bleeder valve V1 of dibasic acid, and the export of the rotatory bleeder valve V1 of dibasic acid is passed through dibasic acid feeding pipe G1 and is connected with the dog-house of dibasic acid thick liquids blending tank 2, and the rotational speed of the rotatory bleeder valve V1 of dibasic acid is controlled by the liquid level of dibasic acid thick liquids blending tank 2; the top of the dibasic acid slurry mixing tank 2 is provided with a spray column 2a extending upwards, the top of the spray column 2a is provided with an exhaust elbow, the upper part of the spray column 2a is provided with a nozzle, a water supply pipeline of the nozzle is connected with a pure water supply pipeline W0 through a dibasic acid mixed pure water flowmeter F1 and a dibasic acid mixed pure water control valve V2, and the opening degree of the dibasic acid mixed pure water control valve V2 is controlled by the dibasic acid mixed pure water flowmeter F1; a frame type stirrer is arranged in the inner cavity of the binary acid slurry mixing tank 2, the outlet at the bottom of the binary acid slurry mixing tank 2 is connected with the inlet of a binary acid slurry delivery pump B1, and the outlet of a binary acid slurry delivery pump B1 is connected with the binary acid inlet of the primary salt forming tank 5 through a binary acid slurry supply pipe G2; the dibasic acid slurry supply pipe G2 is provided with a dibasic acid slurry on-line densimeter D1 and a dibasic acid slurry flow meter F2, and the dibasic acid blending pure water flow meter F1 is controlled by the dibasic acid slurry on-line densimeter D1.
The dibasic acid is conveyed into a dibasic acid bin 1 in an automatic conveying mode, the dibasic acid rotary discharge valve V1 rotates to quantitatively convey the dibasic acid into a dibasic acid slurry blending tank 2, and the input amount of the dibasic acid is adjusted according to the liquid level fluctuation in the dibasic acid slurry blending tank 2. The dibasic acid slurry blending tank 2 mixes the dibasic acid and the pure water according to a certain proportion at normal temperature in advance, and the frame type stirrer stirs and mixes the mixture into turbid liquid of the dibasic acid and the water.
The top of the binary acid slurry mixing tank 2 is provided with a spraying column 2a, and the exhaust bent pipe is arranged at the top of the spraying column 2a, so that not only is the settling height of dust increased, but also the dust in the exhaust gas is sprayed and washed by pure water and falls back to the binary acid slurry mixing tank 2. The prepared dibasic acid slurry is conveyed into a primary salt forming tank 5 by a dibasic acid slurry conveying pump B1 through a dibasic acid slurry supply pipe G2, the density of the dibasic acid slurry is measured by a dibasic acid slurry online densimeter D1, the concentration of the dibasic acid slurry is calculated, and the calculated concentration is supplied to a dibasic acid prepared pure water flowmeter F1, and if the concentration of the dibasic acid slurry is higher, the opening of a dibasic acid prepared pure water control valve V2 is increased; if the concentration of the dibasic acid slurry is lower, the opening degree of the dibasic acid-prepared pure water control valve V2 is reduced, and the proportion of the dibasic acid and the pure water is ensured to meet the requirement; at the same time, the flow is accurately measured by a binary acid slurry flow meter F2.
The bottom of the dibasic acid bin 1 is provided with a nitrogen back-blowing device 1a, the lower part of the dibasic acid feeding pipe G1 is provided with a nitrogen blowing opening, and the nitrogen back-blowing device 1a and the nitrogen blowing opening are both connected with a nitrogen supply pipe W3 through a nitrogen valve. The nitrogen is blown out from the nitrogen back-blowing device 1a, so that the dibasic acid can be prevented from hardening or bridging at the bottom of the storage bin, and the dibasic acid can be ensured to fall smoothly. The nitrogen is periodically introduced into the nitrogen blowing opening at the lower part of the dibasic acid feeding pipe G1, so that the feed opening of the dibasic acid feeding pipe G1 and the dibasic acid slurry blending tank 2 can be further kept smooth.
A premelting kettle heating jacket is arranged on the periphery of the diamine premelting kettle 3, a frame stirrer and a premelting kettle heating coil are arranged in an inner cavity of the diamine premelting kettle 3, a diamine gap discharge valve V3 is arranged at the bottom of the diamine premelting kettle 3, an outlet of a diamine gap discharge valve V3 is connected with an inlet at the top of a diamine storage tank 4 through a diamine feeding pipe G3, a heating coil of the diamine storage tank 4 is arranged in an inner cavity of the diamine storage tank 4, a bottom discharge port of the diamine storage tank 4 is connected with an inlet of a diamine conveying pump B2, an outlet of the diamine conveying pump B2 is connected with a diamine supply pipe G4, and a diamine inlet of a primary salt forming tank 5 is connected with the diamine supply pipe G4 through a primary diamine flow meter F3 and a primary diamine control valve V4.
The general diamine has a low melting point, for example, the melting point of the sunflower diamine is 62 ℃, the melting point of the pentamethylene diamine is 9 ℃, the melting point of the hexamethylene diamine is 39-43 ℃, the melting point of the dodecane diamine is 67-69 ℃, the solid diamine is firstly fed into a diamine pre-melting kettle 3 in an automatic conveying mode, steam from a steam pipe G7 enters a heating jacket of the pre-melting kettle and a heating coil of the pre-melting kettle to heat the solid diamine, condensed water is discharged and recycled from a condensed water pipe G8, and the solid diamine is pre-melted into a liquid state through heating, so that the problem that the sheet diamine material is difficult to accurately measure and convey in the continuous production process is solved. A frame type stirrer is arranged in the diamine premelting kettle 3 for stirring, a certain amount of mother liquor is reserved during each batch of reaction, a solid melting material and a liquid material are quickly melted under the stirring action, the melted materials are put into a diamine storage tank 4 for storage at intervals under the action of a position difference through a diamine gap discharge valve V3, and a steam pipe G7 supplies steam to a heating coil of the diamine storage tank 4 to keep the temperature of the diamine.
The diamine conveying pump B2 sends out liquid diamine, and the liquid diamine is sent into the primary salt forming tank 5 through a diamine feeding pipe G3, the primary diamine flow meter F3 accurately measures the flow of the diamine, the opening degree of the primary diamine control valve V4 is accurately controlled, and the diacid and the diamine with equal molar ratio react to form salt in the primary salt forming tank 5.
The top pure water inlet of the primary salt forming tank 5 is connected with a pure water supply pipe W0 through a primary salt forming tank water supplementing pipe W1, a primary salt forming tank water supplementing pipe W1 is provided with a primary salt forming pure water flowmeter F4 and a primary salt forming pure water control valve V5, and the opening degree of the primary salt forming pure water control valve V5 is controlled by a primary salt forming pure water flowmeter F4; one-level salifying bleeder valve V6 is installed to the bottom of primary salt bath 5, the export of one-level salifying bleeder valve V6 links to each other with the entry of one-level salt solution delivery pump B3, the export of one-level salt solution delivery pump B3 passes through one-level salt solution output tube G5 and links to each other with the salt solution entry of second grade salifying groove 6, install the online densimeter D2 of one-level salt solution and the online pH meter P1 of one-level salt solution on one-level salt solution output tube G5, one-level salifying pure water flowmeter F4 is controlled by the online densimeter D2 of one-level salt solution.
The primary salt forming tank water replenishing pipe W1 replenishes a proper amount of pure water into the primary salt forming tank 5 through a primary salt forming pure water flowmeter F4 and a primary salt forming pure water control valve V5, so that the primary salt forming is kept at a proper concentration. The salt solution in the primary salt forming tank 5 enters a primary salt solution conveying pump B3 through a primary salt solution discharging valve V6, the primary salt solution conveying pump B3 conveys the salt solution into a secondary salt forming tank 6 through a primary salt solution output pipe G5, and a primary salt solution online pH meter P1 measures the pH value of the primary salt solution; the primary salt solution online densimeter D2 measures the density of the primary salt solution, calculates the concentration of the primary salt solution, and provides the concentration to the primary salt solution pure water flowmeter F4, if the concentration of the primary salt solution is higher, the primary salt solution pure water control valve V5 increases the opening; if the concentration of the primary salt solution is lower, the opening degree of the primary salt-forming pure water control valve V5 is reduced, and the concentration of the primary salt solution is accurately controlled.
The diamine inlet of the secondary salt forming tank 6 is connected with a diamine supply pipe G4 through a secondary diamine flow meter F5 and a secondary diamine control valve V7, the opening degree of the secondary diamine control valve V7 is controlled by the secondary diamine flow meter F5, and the secondary diamine flow meter F5 is controlled by a primary salt solution on-line pH meter P1.
The concentration and the pH value of the primary salt solution are basically and accurately adjusted, and the primary salt solution enters a secondary salt forming tank 6 to continue to react and further accurately adjust the concentration and the pH value of the salt solution. Because the dibasic acid slurry is turbid liquid, the interval addition is easy to settle in a pipeline to cause blockage, so that the diamine in the primary salt forming tank 5 is in a negative error state, and the pH value of the secondary salt forming tank 6 is adjusted by adding the diamine. When the pH value of the primary salt solution is lower than a set value, a secondary diamine flow meter F5 controls a secondary diamine control valve V7 to increase the opening degree, and more diamine is supplemented into the secondary salt forming tank 6; when the pH value of the primary salt solution is higher than a set value, the secondary diamine flow meter F5 controls the secondary diamine control valve V7 to reduce the opening, and the secondary salt forming tank 6 reduces the supplement amount of diamine, so that the pH value of the secondary salt solution can be accurately controlled.
A top pure water inlet of the secondary salt forming tank 6 is connected with a pure water supply pipe W0 through a secondary salt forming tank water supplementing pipe W2, a secondary salt forming pure water flowmeter F6 and a secondary salt forming pure water control valve V8 are mounted on the secondary salt forming tank water supplementing pipe W2, and the opening degree of the secondary salt forming pure water control valve V8 is controlled by a secondary salt forming pure water flowmeter F6; the bottom of the secondary salt forming tank 6 is provided with a secondary salt forming discharge valve V9, the outlet of the secondary salt forming discharge valve V9 is connected with the inlet of a secondary salt liquid conveying pump B4, the outlet of the secondary salt liquid conveying pump B4 is connected with a secondary salt liquid output pipe G6, the secondary salt liquid output pipe G6 is provided with a secondary salt liquid online densimeter D3 and a secondary salt liquid online pH meter P2, and the secondary salt forming pure water flowmeter F6 is controlled by a secondary salt liquid online densimeter D3.
The secondary salt forming tank water replenishing pipe W2 replenishes a proper amount of pure water into the secondary salt forming tank 6 through a secondary salt forming pure water flowmeter F6 and a secondary salt forming pure water control valve V8, so that the secondary salt forming is kept at a proper concentration. The salt solution in the secondary salt forming tank 6 enters a secondary salt solution delivery pump B4 through a secondary salt forming discharge valve V9, the secondary salt solution delivery pump B4 is discharged through a secondary salt solution output pipe G6, and a secondary salt solution online pH meter P2 measures the pH value of the secondary salt solution; the secondary salt solution on-line densimeter D3 measures the density of the secondary salt solution, calculates the concentration of the secondary salt solution, and provides the concentration to the secondary salt formation pure water flowmeter F6, if the concentration of the secondary salt solution is higher, the secondary salt formation pure water control valve V8 increases the opening degree; if the concentration of the secondary salt solution is lower, the opening degree of the secondary salt-forming pure water control valve V8 is reduced, and the concentration of the secondary salt solution is accurately controlled.
The diamine feeding pipe G3, the diamine supply pipe G4, the primary salt solution output pipe G5 and the secondary salt solution output pipe G6 are all jacket heating pipelines.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention can also have other embodiments, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the present invention. The undescribed technical features of the present invention can be realized by or using the prior art, and are not described herein again.
Claims (7)
1. The utility model provides a raw materials blending device of nylon continuous salification, includes the dibasic acid feed bin, its characterized in that: a discharge port at the bottom of the dibasic acid bin is provided with a dibasic acid rotary discharge valve, an outlet of the dibasic acid rotary discharge valve is connected with a feed inlet of the dibasic acid slurry blending tank through a dibasic acid feed pipe, and the rotating speed of the dibasic acid rotary discharge valve is controlled by the liquid level of the dibasic acid slurry blending tank; the top of the dibasic acid slurry mixing tank is provided with an upwardly extending spraying column, the top of the spraying column is provided with an exhaust bent pipe, the upper part of the spraying column is provided with a nozzle, a water supply pipeline of the nozzle is connected with a pure water supply pipe through a dibasic acid mixed pure water flowmeter and a dibasic acid mixed pure water control valve, and the opening degree of the dibasic acid mixed pure water control valve is controlled by the dibasic acid mixed pure water flowmeter; a frame type stirrer is arranged in the inner cavity of the binary acid slurry mixing tank, the outlet at the bottom of the binary acid slurry mixing tank is connected with the inlet of a binary acid slurry delivery pump, and the outlet of the binary acid slurry delivery pump is connected with the binary acid inlet of the primary salt forming tank through a binary acid slurry supply pipe; the binary acid slurry supply pipe is provided with a binary acid slurry on-line densimeter and a binary acid slurry flow meter, and the binary acid blending pure water flow meter is controlled by the binary acid slurry on-line densimeter.
2. The raw material blending device for nylon continuous salt forming of claim 1, characterized in that: the bottom of binary acid feed bin is equipped with nitrogen gas blowback device, the lower part of binary acid feeder pipe is equipped with nitrogen gas blowout mouth, nitrogen gas blowback device and nitrogen gas blowout mouth all link to each other with nitrogen gas supply pipe through the nitrogen gas valve.
3. The raw material blending device for nylon continuous salt forming of claim 1, characterized in that: still include the diamine premelting kettle, the periphery of diamine premelting kettle is equipped with premelting kettle heating jacket, the inner chamber of diamine premelting kettle is equipped with frame agitator and premelting kettle heating coil, the bottom of diamine premelting kettle is equipped with diamine clearance bleeder valve, the export of diamine clearance bleeder valve links to each other through the top entry of diamine dog-house and diamine storage tank, the inner chamber of diamine storage tank is equipped with diamine heating coil, the bottom discharge gate of diamine storage tank links to each other with the entry of diamine delivery pump, the exit linkage of diamine delivery pump has the diamine feed pipe, the diamine entry of one-level salification tank links to each other with the diamine feed pipe through one-level diamine flow meter and one-level diamine control valve.
4. The raw material blending device for nylon continuous salt forming of claim 3, characterized in that: the top pure water inlet of the primary salt forming tank is connected with a pure water supply pipe through a primary salt forming tank water replenishing pipe, a primary salt forming pure water flowmeter and a primary salt forming pure water control valve are mounted on the primary salt forming tank water replenishing pipe, and the opening degree of the primary salt forming pure water control valve is controlled by the primary salt forming pure water flowmeter; one-level salifying bleeder valve is installed to the bottom in one-level salt bath, and the export of one-level salifying bleeder valve links to each other with the entry of one-level salt liquid delivery pump, and the export of one-level salt liquid delivery pump passes through the salt liquid entry that one-level salt liquid output tube and second grade salifying groove and links to each other, installs the online densimeter of one-level salt liquid and the online pH meter of one-level salt liquid on the one-level salt liquid output tube, and one-level salifying pure water flowmeter is controlled by the online densimeter of one-level.
5. The raw material blending device for nylon continuous salt forming of claim 4, characterized in that: the diamine inlet of the secondary salt forming tank is connected with a diamine supply pipe through a secondary diamine flowmeter and a secondary diamine control valve, the opening degree of the secondary diamine control valve is controlled by the secondary diamine flowmeter, and the secondary diamine flowmeter is controlled by a primary salt solution on-line pH meter.
6. The raw material blending device for nylon continuous salt forming of claim 5, characterized in that: the top pure water inlet of the secondary salt forming tank is connected with a pure water supply pipe through a secondary salt forming tank water replenishing pipe, a secondary salt forming pure water flow meter and a secondary salt forming pure water control valve are mounted on the secondary salt forming tank water replenishing pipe, and the opening degree of the secondary salt forming pure water control valve is controlled by the secondary salt forming pure water flow meter; the second grade salifying bleeder valve is installed to the bottom in second grade salt groove, and the export of second grade salifying bleeder valve links to each other with the entry of second grade salt liquid delivery pump, and the exit linkage of second grade salt liquid delivery pump has second grade salt liquid output tube, installs the online densimeter of second grade salt liquid and the online pH meter of second grade salt liquid on the second grade salt liquid output tube, and second grade salifying pure water flowmeter is controlled by the online densimeter of second grade salt liquid.
7. The raw material blending device for nylon continuous salt forming of claim 6, characterized in that: and the diamine feeding pipe, the diamine supply pipe, the primary salt solution output pipe and the secondary salt solution output pipe are all jacket heating pipelines.
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| CN202020542025.5U CN212167418U (en) | 2020-04-14 | 2020-04-14 | Raw material blending device for continuous nylon salification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112778517A (en) * | 2020-12-31 | 2021-05-11 | 无锡殷达尼龙有限公司 | Continuous production method of long carbon chain nylon 1018 salt |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112778517A (en) * | 2020-12-31 | 2021-05-11 | 无锡殷达尼龙有限公司 | Continuous production method of long carbon chain nylon 1018 salt |
| CN112778517B (en) * | 2020-12-31 | 2022-12-16 | 无锡殷达尼龙有限公司 | Continuous production method of long carbon chain nylon 1018 salt |
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Address after: No. 301, Wangjiang Road, economic and Technological Development Zone, Yangzhou City, Jiangsu Province Patentee after: Yangzhou Huitong Technology Co.,Ltd. Address before: No. 301, Wangjiang Road, economic and Technological Development Zone, Yangzhou City, Jiangsu Province Patentee before: YANGZHOU HUITONG CHEMICAL TECHNOLOGY Co.,Ltd. |