CN218012110U - Circulating tetrahydrofuran premixing system - Google Patents
Circulating tetrahydrofuran premixing system Download PDFInfo
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- CN218012110U CN218012110U CN202222065977.4U CN202222065977U CN218012110U CN 218012110 U CN218012110 U CN 218012110U CN 202222065977 U CN202222065977 U CN 202222065977U CN 218012110 U CN218012110 U CN 218012110U
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Abstract
The utility model belongs to the technical field of chemical industry device, concretely relates to circulation tetrahydrofuran mixes system in advance. The device comprises a tank body, a circulating pump, a condenser, a circulating tetrahydrofuran storage tank, a ball valve, a gate valve I, a gate valve II, a control valve I and a safety valve; a feeding port is arranged at the upper part of the tank body, a discharging port is arranged at the bottom of the tank body, and a gas discharging port and a pressure relief port are arranged at the top of the tank body; the discharge port of the tank body is connected with a feed inlet of the tank body through a gate valve I to form a loop, and the discharge port of the tank body is connected with a circulating tetrahydrofuran storage tank through a gate valve II; a gas discharge port of the tank body is connected with a gas phase inlet of a condenser through a control valve I, and a liquid phase outlet of the condenser is connected with a circulating tetrahydrofuran storage tank; the pressure relief port of the tank body is vented to the atmosphere through a safety valve. The utility model discloses do not stop at the device, product molecular weight and colourity do not appear under the undulant condition replacing circulation tetrahydrofuran, reach the effect that reduces and clear away impurity.
Description
Technical Field
The utility model belongs to the technical field of chemical industry device, concretely relates to circulation tetrahydrofuran mixes system in advance.
Background
The device for preparing the polytetramethylene ether diacetate adopts the American Invidant process, and the polymerization process comprises the following steps: the polymerization materials tetrahydrofuran, acetic anhydride and acetic acid are subjected to ring-opening polymerization reaction under the action of a perfluorosulfonic acid resin catalyst, and the end group of the acetic anhydride is used as a blocking agent to generate polytetramethylene ether diacetate with the conversion rate of 29.6-35 percent. The molecular weight of the polytetramethylene ether diacetate product is controlled by the ratio of acetic anhydride to tetrahydrofuran and the acetic acid content of the recycled tetrahydrofuran stream. And simultaneously, unreacted tetrahydrofuran, acetic anhydride and acetic acid are contained in the polymerization reactor, and the components are removed from the polymerization reactor through separation and stripping operations and then recycled to a circulating tetrahydrofuran storage tank, so that by-product impurities in the polymerization reactor and other impurities in the system are accumulated in the circulating tetrahydrofuran. It needs to be discharged and replaced after reaching a certain concentration. The prior art can cause the problems of large fluctuation of product chromaticity and molecular weight and even shutdown and production reduction when the operation is carried out.
Disclosure of Invention
The utility model aims at providing a system is mixed in advance to circulation tetrahydrofuran for when polymerization workshop section circulation tetrahydrofuran impurity is too much, need discharge the back and reformulate circulation tetrahydrofuran liquid. The utility model discloses do not stop at the device, product molecular weight and colourity do not appear under the undulant condition replacing circulation tetrahydrofuran, reach the effect that reduces and clear away impurity.
In order to achieve the above purpose, the utility model discloses technical scheme as follows:
a circulating tetrahydrofuran premixing system comprises a tank body, a circulating pump, a condenser, a circulating tetrahydrofuran storage tank, a ball valve, a gate valve I, a gate valve II, a control valve I and a safety valve; a feeding port is formed in the upper part of the tank body, a discharging port is formed in the bottom of the tank body, and a gas discharging port and a pressure relief port are formed in the top of the tank body; the discharge port of the tank body is connected with a feed inlet of the tank body through a gate valve I to form a loop, and the discharge port of the tank body is connected with a circulating tetrahydrofuran storage tank through a gate valve II; a gas discharge port of the tank body is connected with a gas phase inlet of a condenser through a control valve I, and a liquid phase outlet of the condenser is connected with a circulating tetrahydrofuran storage tank; and the pressure relief port of the tank body is discharged to the atmosphere through a safety valve.
In the above technical scheme, further, a temperature detector is arranged at the lower part of the tank body and used for measuring the temperature of the materials in the tank body.
Among the above-mentioned technical scheme, furtherly, jar side wall is provided with the level gauge for measure the internal material liquid level of jar.
In the above technical scheme, further, a pressure sensor is arranged at the top of the tank body to measure the real-time pressure in the tank body.
Among the above-mentioned technical scheme, furtherly, the system still includes control valve II, control valve II is located between the discharge gate of the jar body and the ball valve.
In the above technical solution, further, the volume of the tank body is 25m 3 。
The beneficial effects of the utility model are that:
the molecular weight and chromaticity of a polymerization product can fluctuate for about 4.5 hours under the existing process conditions, so that unqualified products are produced, and the yield of the polymerization product is calculated according to 7500kg/h of each set of device, so that about 33750kg of unqualified products are produced; according to the current average market price of PTMEG 40000 yuan/ton, the method can save: 40000 yuan/ton 33.75 ton =1350000 yuan. According to past operating experience, the operation occurs on average about 10 times per year, so 1350 ten thousand yuan can be saved by the method of the invention.
The utility model provides an operating time space, avoided under urgent operating mode acetic acid unfreeze, acetic acid adds, the fourth phase furan adds the risk of the poisoning and burning of the operating personnel who brings.
The utility model discloses do not stop at the device, product molecular weight and colourity do not appear under the undulant condition replacing circulation tetrahydrofuran, reach the effect that reduces and clear away impurity.
Drawings
FIG. 1 is a schematic diagram of the structure of the circulating tetrahydrofuran premixing system of the present invention;
in the figure: 1. the device comprises a tank body, 2 circulating pumps, 3 circulating tetrahydrofuran storage tanks, 4 condensers, 5 liquidometers, 6 pressure sensors, 7 temperature detectors, 8 ball valves, 9 gate valves I and 10, gate valves II, 11 safety valves, 12 control valves I and 13 and a control valve II.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention, but are not intended to limit the invention in any manner.
A circulating tetrahydrofuran premixing system is shown in figure 1 and comprises a tank body 1, a circulating pump 2, a circulating tetrahydrofuran storage tank 3, a condenser 4, a ball valve 8, a gate valve I9, a gate valve II 10, a safety valve 11 and a control valve I12; a feeding port is formed in the upper part of the tank body 1, a discharging port is formed in the bottom of the tank body 1, and a gas discharging port and a pressure relief port are formed in the top of the tank body 1; the discharge port of the tank body is connected with a circulating pump 2 in two ways through a ball valve 8 in sequence, the first way is connected with the feed port of the tank body 1 through a gate valve I9 to form a loop, and the second way is connected with a circulating tetrahydrofuran storage tank 3 through a gate valve II 10; a gas discharge port of the tank body 1 is connected with a gas phase inlet of a condenser 4 through a control valve I12, and a liquid phase outlet of the condenser 4 is connected with a circulating tetrahydrofuran storage tank 3; the pressure relief port of the tank 1 is vented to atmosphere through a safety valve 11.
The lower part of the tank body 1 is provided with a temperature detector 7, and a probe of the temperature detector is inserted into the tank body and used for measuring the temperature of materials in the tank body.
The side wall of the tank body 1 is provided with a liquid level meter 5, and a probe of the liquid level meter is inserted into the tank body and used for measuring the material liquid level in the tank body.
The top of the tank body 1 is provided with a pressure sensor 6, and a probe of the pressure sensor is inserted into the tank body to measure the real-time pressure in the tank body.
The system also comprises a control valve II 13, wherein the control valve II 13 is positioned between the material port of the tank body 1 and the ball valve 8 and is used for remotely cutting off in case of emergency.
The volume of the tank body 1 is 25m 3 。
The use method of the circulating tetrahydrofuran premixing system comprises the following steps:
the system pressure is controlled to be 7.0-10.0kpa g, and the temperature is controlled to be 15-45 ℃;
(1) Adding unfrozen acetic acid into the tank body 1 through a pipeline, and adding refined tetrahydrofuran into the tank body 1 through a pipeline;
(2) Starting the ball valve 8, the circulating pump 2 and the gate valve I9, and circularly mixing for 2 hours;
(3) After mixing, starting a gate valve II 10, and collecting the mixed circulating tetrahydrofuran material to a circulating tetrahydrofuran storage tank 3 through a pipeline;
(4) And starting the control valve I12, introducing gas-phase tetrahydrofuran generated in the tank body 1 into a condenser for condensation, simultaneously introducing high-purity nitrogen to supplement pipeline pressure, and recovering the condensed liquid-phase tetrahydrofuran to the circulating tetrahydrofuran storage tank 3.
The above embodiments are merely preferred examples of the present invention, and are not intended to limit the embodiments. The protection scope of the present invention should be subject to the scope defined by the claims. Other variations and modifications may be made on the basis of the above description. Obvious changes or modifications can be made without departing from the scope of the invention.
Claims (6)
1. A circulating tetrahydrofuran premixing system is characterized by comprising a tank body, a circulating pump, a condenser, a circulating tetrahydrofuran storage tank, a ball valve, a gate valve I, a gate valve II, a control valve I and a safety valve;
a feeding port is formed in the upper part of the tank body, a discharging port is formed in the bottom of the tank body, and a gas discharging port and a pressure relief port are formed in the top of the tank body;
the discharge port of the tank body is connected with a feed inlet of the tank body through a gate valve I to form a loop, and the discharge port of the tank body is connected with a circulating tetrahydrofuran storage tank through a gate valve II;
a gas discharge port of the tank body is connected with a gas phase inlet of a condenser through a control valve I, and a liquid phase outlet of the condenser is connected with a circulating tetrahydrofuran storage tank;
and the pressure relief port of the tank body is discharged to the atmosphere through a safety valve.
2. The premixing system of claim 1 wherein the tank is provided with a temperature probe at a lower portion thereof.
3. The circulating tetrahydrofuran premixing system of claim 1 wherein the tank sidewall is provided with a liquid level gauge.
4. The premixed system of claim 1, wherein the tank top is provided with a pressure sensor.
5. The premixing system of claim 1 further comprising a control valve ii, wherein the control valve ii is located between the outlet of the tank and the ball valve.
6. The premixed system of claim 1, wherein the tank has a volume of 25m 3 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222065977.4U CN218012110U (en) | 2022-08-08 | 2022-08-08 | Circulating tetrahydrofuran premixing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222065977.4U CN218012110U (en) | 2022-08-08 | 2022-08-08 | Circulating tetrahydrofuran premixing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218012110U true CN218012110U (en) | 2022-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222065977.4U Active CN218012110U (en) | 2022-08-08 | 2022-08-08 | Circulating tetrahydrofuran premixing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218012110U (en) |
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2022
- 2022-08-08 CN CN202222065977.4U patent/CN218012110U/en active Active
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