Stable storage system for acrylic acid and acrylic ester

Abstract

The utility model discloses a stable storage system of acrylic acid and acrylic ester, which comprises a storage tank for storing acrylic acid and acrylic ester and a preparation device of lean oxygen, the storage tank is provided with an air inlet pipe, and an air outlet of the preparation device of lean oxygen is connected with the air inlet pipe. The stable storage system for acrylic acid and acrylate provided by the utility model is simple and convenient in process, low in investment cost, safe and stable, high-purity nitrogen and compressed air provided by a chemical industry park can be used as raw material gases, the gas inlet proportion is adjusted through the gas adjusting valve, and the raw material gases enter the buffer tank after being mixed by the gas mixer; and oxygen-poor gas enters the storage tank through a pipeline. And a lean oxygen distributor can be arranged at the bottom of the storage tank, so that lean oxygen is uniformly discharged, and a storage environment with the lean oxygen is continuously provided for the storage tank.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas storage system, especially propylene acid and propylene acid ester's stable storage system. BACKGROUND

[0002] If the storage mode is improper in the production and storage process of propylene acid and propylene acid ester monomer, the polymerization of propylene acid or propylene acid ester often occurs, which generally shows that the storage temperature rises due to the heat release of the storage tank caused by polymerization, further triggers polymerization, the viscosity of the material increases, and even safety accidents such as the temperature of the storage tank rising or the pressure accumulating and rising occur.

[0003] Large propylene acid or propylene acid ester storage tanks usually need to provide a storage environment with oxygen. The mechanism of oxygen as a polymerization inhibitor is mainly that it can capture free radicals. In the free radical polymerization reaction, free radicals are initiators and chain growth agents of the polymerization reaction. However, when oxygen exists, it will react with free radicals to generate products such as peroxide radicals or hydrogen peroxide, thereby consuming free radicals and preventing the polymerization reaction from proceeding.

[0004] However, too high oxygen concentration makes the solvent in the production process within a certain space in the explosion limit range, which brings great safety risks in the production process of propylene acid and propylene acid ester. Therefore, oxygen-poor gas with an oxygen content of 5-8% is needed for polymerization inhibition in the production of propylene acid and propylene acid ester monomers.

[0005] The domestic process for producing propylene acid and propylene acid ester monomers generally uses pressure swing adsorption technology PSA to prepare oxygen-poor gas. The principle is to separate gas mixtures by using the difference in the "adsorption" performance of molecular sieves for different gas molecules. It uses air as raw material and uses a high-efficiency and high-selectivity solid adsorbent to separate nitrogen and oxygen in air. The equipment cost is high, and the maintenance and operation energy consumption cost is also high. Moreover, the unstable oxygen-poor content often leads to the polymerization of process materials. UTILITY MODEL CONTENTS

[0006] The utility model provides a kind of propylene acid and propylene acid ester's stable storage system.

[0007] Specifically, the utility model provides technical solutions as follows: propylene acid and propylene acid ester's stable storage system, including the storage tank for storing propylene acid and propylene acid ester, and the preparation device of oxygen-poor gas, the storage tank is equipped with inlet pipe, and is connected with the preparation device of oxygen-poor gas.

[0008] The preparation device of oxygen-poor gas comprises a buffer tank as an oxygen-poor gas tank, an air inlet of which is connected with a gas mixer, a high-purity nitrogen gas inlet pipe and a compressed air inlet pipe are respectively connected with the air inlet of the gas mixer, and the two kinds of gases are mixed in the gas mixer and then enter the oxygen-poor gas tank to continuously provide the required concentration of oxygen-poor gas for production.

[0009] Flow meters and automatic regulating valves are respectively arranged on the high-purity nitrogen gas inlet pipe and the compressed air inlet pipe to monitor the raw material gas inlet flow and adjust the inlet flow.

[0010] An online oxygen content analyzer is arranged on the top of the oxygen-poor gas tank, which is connected with the automatic regulating valve on the compressed air inlet pipe, the online oxygen content analyzer analyzes the oxygen content in the tank and controls the automatic regulating valve on the compressed air inlet pipe to automatically adjust the compressed air flow according to the set oxygen content.

[0011] A pressure remote control device is arranged on the top of the oxygen-poor gas tank, which controls the automatic regulating valve on the nitrogen gas inlet pipe to automatically adjust the nitrogen flow according to the set pressure.

[0012] A drain pipeline is arranged at the bottom of the oxygen-poor gas tank to regularly drain water and ensure the dryness of the oxygen-poor gas.

[0013] An emergency shut-off valve is arranged at the top outlet of the oxygen-poor gas tank, which forms a chain control with the online oxygen content analyzer, and when the oxygen content is greater than or equal to 8%, the emergency chain is cut off to avoid the formation of explosive gas in the reaction system.

[0014] A flow monitor is arranged at the top outlet of the oxygen-poor gas tank to ensure the flow supply of the oxygen-poor gas user and timely alarm when low flow occurs.

[0015] A one-way valve is arranged on the oxygen-poor gas inlet pipe of the storage tank to prevent the material from being reversed into the oxygen-poor gas tank.

[0016] A self-adjusting valve is arranged on the oxygen-poor gas inlet pipe of the storage tank, and the set pressure of the inlet pressure is 0.002MPA to ensure that the storage tank will not be over-pressured.

[0017] An oxygen-poor gas distributor connected with the inlet pipe is arranged near the bottom in the storage tank, the distributor is uniformly provided with 30 Φ3 gas outlets, and the direction is downward.

[0018] A breather valve is arranged on the top of the storage tank to timely discharge gas when the pressure of the storage tank is high.

[0019] A pressure remote controller is arranged on the top of the storage tank to alarm when the pressure of the storage tank is greater than or equal to 0.002MPA.

[0020] A temperature remote controller is arranged on the side of the storage tank to alarm when the temperature of the storage tank is greater than or equal to 30℃.

[0021] The low-temperature water coil pipe is arranged on the outer wall of the storage tank to continuously provide a storage environment of 15-25 DEG C for the storage tank.

[0022] The utility model discloses the beneficial effect:

[0023] 1. The utility model provides a stable storage system of acrylic acid and acrylate, and the process is simple, the investment cost is low and safe and stable. The high-purity nitrogen gas and compressed air provided by the chemical industry park can be used as raw material gas, and the gas is mixed in the oxygen-poor gas preparation device according to the proportion, and the oxygen-poor gas storage environment is continuously provided for the storage tank.

[0024] 2. The utility model provides the preparation system of oxygen-poor gas, including buffer tank, as oxygen-poor gas tank, its gas inlet connects gas mixer, high-purity nitrogen gas inlet pipe and compressed air inlet pipe enter gas mixer according to the proportion respectively after mixing and enter oxygen-poor gas tank storage, continuously provide the oxygen-poor gas of required concentration for production.

[0025] 3. The utility model discloses the on -line oxygen content analyzer of oxygen-poor gas tank's tank top, through the analysis to the oxygen content of the gas in the tank, and control the automatic regulating valve on compressed air inlet pipe, according to the oxygen content of setting automatic regulation inlet compressed air flow.

[0026] 4. The utility model discloses the pressure telecontrol control device of oxygen-poor gas tank's tank top setting, and the automatic regulating valve of nitrogen gas inlet pipe is controlled to the pressure telecontrol control device, and the nitrogen gas flow of inlet is automatically regulated according to the pressure of setting.

[0027] 5. The utility model discloses the emergency cut -out valve of oxygen-poor gas tank's top export, and it forms interlock control with on -line oxygen content monitor, when oxygen content is greater than or equal to 8%, emergency interlock cut -out, avoid the explosive gas of reaction system formation.

[0028] 6. The utility model discloses the flow monitor of oxygen-poor gas tank's top export setting, ensures the flow supply of oxygen-poor gas, and when low flow appears, timely alarm.

[0029] 7. The utility model discloses the one -way valve of storage tank's gas inlet pipe is provided with, prevents the material of gas system and goes back to oxygen-poor gas tank. DRAWINGS

[0030] Figure 1 It is the structure schematic drawing of the stable storage system of acrylic acid and acrylate of the utility model embodiment.

[0031] Figure 2 It is the structure schematic drawing of the oxygen-poor gas distributor of the utility model embodiment. SPECIFIC EMBODIMENTS

[0032] As Figure 1 The stable storage system of acrylic acid and acrylate is an embodiment of the utility model.

[0033] The stable storage system of acrylic acid and acrylic ester comprises a storage tank 15 for storing acrylic acid and acrylic ester, and an oxygen-deficient gas preparation device.

[0034] The storage tank 15 is provided with an oxygen-depleted air inlet pipe 17 and an oxygen-depleted air distributor 16. The oxygen-depleted air distributor 16 is located in the storage tank 15 and near the bottom. The inlet end of the oxygen-depleted air inlet pipe 17 extends into the tank and is connected to the oxygen-depleted air distributor 16. Figure 2 As shown, the oxygen-depleted air distributor 16 is evenly provided with 30 Φ3 air outlet holes, facing downward. The air outlet of the oxygen-depleted air inlet pipe 17 is connected to the oxygen-depleted air distributor 16. The air inlet of the oxygen-depleted air inlet pipe 17 is connected to the air outlet end of the oxygen-depleted air preparation device.

[0035] The oxygen-depleted air inlet pipe 17 of the storage tank 15 is provided with a one-way valve 14 to prevent the material from flowing back into the oxygen-depleted air tank 1 .

[0036] The oxygen-depleted air inlet pipe 17 of the storage tank 15 is provided with a self-operated regulating valve 18 , which is set to an air inlet pressure of 0.002 MPa to ensure that the storage tank 15 does not experience overpressure.

[0037] A breathing valve 19 is provided on the top of the storage tank 15 so that the gas can be discharged in time when the pressure of the storage tank 15 is high.

[0038] A pressure remote controller 20 is provided on the top of the storage tank 15, and an alarm is issued when the pressure of the storage tank 15 is ≥0.002MPA.

[0039] A temperature remote controller 21 is provided on the side of the storage tank 15, and an alarm is issued when the temperature of the storage tank 15 is ≥30°C.

[0040] A low-temperature water coil 13 is provided on the outer wall of the storage tank 15 to continuously provide the storage tank 15 with a storage environment of 15-25°C.

[0041] like Figure 1 As shown, the oxygen-depleted oxygen production apparatus includes a buffer tank serving as an oxygen-depleted oxygen tank 1. The inlet of oxygen-depleted oxygen tank 1 is connected to a gas mixer 2, and a high-purity nitrogen inlet pipe 3 and a compressed air inlet pipe 4 are connected to the inlet of gas mixer 2. Automatic regulating valves 5 and 6 are provided on high-purity nitrogen inlet pipe 3 and compressed air inlet pipe 4, respectively. High-purity nitrogen and compressed air are mixed in gas mixer 2, respectively, through the ratio adjusted by gas regulating valves 5 and 6. After mixing in gas mixer 2, they enter oxygen-depleted oxygen tank 1, continuously providing the required concentration of depleted oxygen for production.

[0042] Flow meters 7 and 8 are respectively provided on the high-purity nitrogen inlet pipe 3 and the compressed air inlet pipe 4 to monitor the inlet flow of the raw gas.

[0043] The top of the oxygen-poor gas tank 1 is provided with an online oxygen content analyzer 9, which is connected with the automatic regulating valve 6 on the compressed air inlet pipe 4. The online oxygen content analyzer 9 analyzes the oxygen content in the tank and controls the automatic regulating valve 6 on the compressed air inlet pipe 4 to automatically regulate the flow of the inlet compressed air according to the set oxygen content.

[0044] The top of the oxygen-poor gas tank 1 is provided with a pressure remote control device 10. The pressure remote control device 10 controls the automatic regulating valve 5 of the nitrogen inlet pipe 3 to automatically regulate the flow of the inlet nitrogen according to the set pressure.

[0045] The bottom of the oxygen-poor gas tank 1 is provided with a drainage pipeline 11 for regular drainage to ensure the dryness of the oxygen-poor gas.

[0046] The top outlet of the oxygen-poor gas tank 1 is provided with an emergency shut-off valve 12. The emergency shut-off valve 12 forms a interlock control with the online oxygen content analyzer 9. When the oxygen content is ≥8%, the emergency interlock is cut off to avoid the formation of explosive gas in the reaction system.

[0047] The top outlet of the oxygen-poor gas tank 1 is provided with a flow monitor 13 to ensure the flow supply of the oxygen-poor gas user and to alarm in time when low flow occurs.

Claims

1. A stable storage system for acrylic acid and acrylates comprising a storage tank for storing acrylic acid and acrylates, said storage tank being provided with a gas inlet pipe, characterized in that, The device also comprises a lean oxygen gas preparation device, the outlet of which is connected with the inlet pipe; the lean oxygen gas preparation device comprises a buffer tank as a lean oxygen gas tank; the inlet of the buffer tank is connected with a gas mixer, and a high-purity nitrogen gas inlet pipe and a compressed air inlet pipe are respectively connected with the inlet of the gas mixer; flow meters and automatic adjusting valves are respectively arranged on the high-purity nitrogen gas inlet pipe and the compressed air inlet pipe; an online oxygen content analyzer is arranged on the top of the lean oxygen gas tank, and is connected with the automatic adjusting valve on the compressed air inlet pipe; a pressure remote control device is arranged on the top of the lean oxygen gas tank, and controls the automatic adjusting valve on the nitrogen gas inlet pipe.

2. The stable storage system for acrylic acid and acrylates according to claim 1, characterized in that, A drain pipeline is arranged at the bottom of the lean oxygen gas tank.

3. The stable storage system for acrylic acid and acrylates according to claim 1, characterized in that, An emergency cut-off valve is arranged at the top outlet of the lean oxygen gas tank, and forms interlocking control with the online oxygen content analyzer.

4. The stable storage system for acrylic acid and acrylates of claim 1, wherein A flow monitor is arranged at the top outlet of the lean oxygen gas tank.

5. The stable storage system for acrylic acid and acrylates of claim 1, wherein A one-way valve is arranged on the lean oxygen gas inlet pipe of the storage tank, so as to prevent materials from being reversely fed into the lean oxygen gas preparation device; a self-adjusting valve is arranged on the lean oxygen gas inlet pipe of the storage tank.

6. The stable storage system for acrylic acid and acrylates of claim 1, wherein A lean oxygen gas distributor is arranged in the storage tank and is connected with the inlet pipe; the lean oxygen gas distributor is uniformly provided with 30 gas outlets with a diameter of 3, and the direction is downward.

7. The stable storage system for acrylic acid and acrylates according to claim 1, characterized in that, A breather valve is arranged on the top of the storage tank; a pressure remote controller is arranged on the top of the storage tank; a temperature remote controller is arranged on the side of the storage tank; and a low-temperature water coil is arranged on the outer wall of the storage tank.

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