Phenolic resin wastewater receiving tank

Abstract

The utility model discloses a phenolic resin wastewater receiving tank which comprises a tank body, and the top surface of the tank body is provided with an on-line pressure gauge port, an on-line liquid level meter port, an emptying port, a vacuum port, a wastewater inlet, a liquid alkali inlet and a nitrogen port. According to the phenolic resin wastewater receiving tank disclosed by the utility model, the liquid caustic soda inlet is formed in the top surface of the tank body and can be connected with a liquid caustic soda tank, quantitative liquid caustic soda is added into the receiving tank by the pump through the flow meter, and meanwhile, the liquid caustic soda inlet can be linked with the pH meter to automatically add the liquid caustic soda. According to the phenolic resin wastewater receiving tank, the nitrogen port is formed in the top surface of the tank body, so that nitrogen can be conveniently fed to replace toxic gas in the receiving tank, the pressure can be increased by using nitrogen, wastewater can be discharged more quickly, and the drainage time is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to phenolic resin preparation equipment technical field, concretely relates to a kind of phenolic resin wastewater receiving tank. BACKGROUND

[0002] Phenolic resin production and wastewater control in phenolic resin production process are one of the key points of the applicant's business development. Before the present application, the applicant has applied and announced a plurality of devices in phenolic resin production and wastewater treatment chain, for example: the patent specification with announcement number CN215963552U discloses a polymerization kettle for phenolic resin wastewater treatment; the patent specification with announcement number CN215327148U discloses a neutralization tank for phenolic resin wastewater treatment; the patent specification with announcement number CN217377433U discloses an aerobic tank for phenolic resin wastewater treatment. At present, the applicant finds that:

[0003] The existing phenolic resin production process produces water, which can prevent the reaction of the resin, and the water needs to be removed. At present, a vacuum pump is used to improve the vacuum degree of the reaction kettle, reduce the boiling point of the water, and heat by introducing steam or heat conducting oil to remove the water from the reaction kettle. The removed water contains low molecular weight products, including water, free aldehyde, free phenol and free small molecular weight resin. When the dehydration temperature is higher, the vacuum degree of the reaction kettle is lower, the temperature is higher, the molecules are more active, and the removed water contains more products, which reduces the yield of the resin. The dehydration time is longer, and the energy consumption of the reaction kettle is higher.

[0004] At the same time, the small molecular weight resin brought out by the removed water will be left in the receiving tank and the pipeline for discharging wastewater. After a long time, it will solidify in the receiving tank and the pipeline, increasing the time and workload of the company for cleaning the receiving tank and the pipeline. After a long time of production and tracking test, it is found that the residual small molecular resin can be dissolved in alkaline liquid when the pH value is alkaline, and the higher the pH value, the better the dissolution. When the pH value is acidic, the small molecular resin will precipitate. The company has begun to gradually modify the receiving tank, increase the pH value in the wastewater receiving tank, and reduce the parameters for maintaining the receiving tank and the pipeline. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of phenolic resin wastewater receiving tank, increase a series of on-line detection equipment, can and reaction kettle, vacuum pump etc. in DCS is automatically interlocked, realize the production of phenolic resin integrated automation control, from raw material production to wastewater discharge.

[0006] The specific technical scheme is as follows:

[0007] A kind of phenolic resin wastewater receiving tank, including tank body;

[0008] The top surface of the tank body is provided with an on-line pressure gauge port, an on-line liquid level gauge port, a vent port, a vacuum port, a waste water inlet, a liquid alkali inlet and a nitrogen port.

[0009] The phenolic resin waste water receiving tank of the utility model sets up liquid alkali inlet on the top surface of the tank body, can connect liquid alkali tank, adds the quantitative liquid alkali into the receiving tank through the flowmeter by pump, can be linked with pH meter simultaneously, and automatically adds liquid alkali.

[0010] The phenolic resin waste water receiving tank of the utility model sets up nitrogen port on the top surface of the tank body, is convenient for putting nitrogen to replace the toxic gas in the receiving tank, can also use nitrogen to increase pressure, discharges waste water more quickly, and saves drainage time.

[0011] In some preferred examples, the phenolic resin waste water receiving tank further comprises one or more sets of temperature control outer coil pipes which are independently controlled and located at different heights outside the tank body.

[0012] The receiving tank is additionally provided with cooling water coil pipes (temperature control outer coil pipes) linked with DCS, which can cool the receiving tank, reduce the temperature of waste water, reduce the amount of water vapor and low-boiling-point solvent taken away by the vacuum pump, reduce the vacuum loss of the receiving tank, improve the vacuum degree of the reaction kettle, reduce the dehydration temperature, increase the steam amount of the reaction kettle, reduce the dehydration time, reduce energy loss, improve the utilization rate of steam, reduce the material taken away by the vacuum pump, improve the resin yield, reduce the material in the vacuum pump, and reduce the maintenance frequency of the vacuum pump.

[0013] In some preferred examples, the phenolic resin waste water receiving tank is provided with at least two manholes, and the two manholes are located at opposite positions of the side surface of the tank body.

[0014] In some preferred examples, the phenolic resin waste water receiving tank is provided with a drain port at the bottom of the tank body.

[0015] In some preferred embodiments, the phenolic resin wastewater receiving tank is provided with an online thermometer port at the bottom of the tank body. When the reactor is performing the dehydration step, the online thermometer of the receiving tank is interlocked with the reactor's automatic control system, automatically controlling the temperature of the dehydration process in the phenolic resin wastewater receiving tank. The online thermometer can also be interlocked with valves of one or more independently controlled temperature-controlled external coils to control the water temperature at a set temperature. The one or more independently controlled temperature-controlled external coils are then opened to allow water in for temperature control. When the temperature approaches the lower limit of the set temperature, the temperature-controlled external coils stop allowing water inflow, and the dehydrated water mixes with the water in the tank to raise the temperature.

[0016] In some preferred embodiments, the phenolic resin wastewater receiving tank is provided with an online pH meter port at the bottom of the tank body. Further preferably, the online pH meter port is interlocked with the liquid caustic soda inlet. The online pH meter in the receiving tank automatically interlocks to control the pH of the water at a set value. When the pH value is low, the liquid caustic soda inlet is interlocked, and liquid caustic soda is automatically added to dissolve small molecular weight resins in the water. When the pH value is high, the addition of liquid caustic soda is automatically stopped.

[0017] In some preferred examples, the phenolic resin wastewater receiving tank has support legs at the bottom of the tank body.

[0018] In some preferred examples, the vent port of the phenolic resin wastewater receiving tank is connected to a vent valve.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. A series of online detection equipment is added to the receiving tank, which can be linked with the reactor, vacuum pump, etc. in the DCS to achieve integrated automated control of phenolic resin production, from feeding production to wastewater discharge.

[0021] 2. Add a temperature-controlled external coil linked to the DCS on the receiving tank to cool the receiving tank, lower the temperature of the wastewater, reduce the amount of water vapor and low-boiling-point solvents carried away by the vacuum pump, reduce the vacuum loss on the receiving tank, increase the vacuum degree of the reactor, lower the dehydration temperature, increase the steam volume of the reactor, reduce the dehydration time, reduce energy loss, improve the utilization rate of steam, and at the same time reduce the material carried away by the vacuum pump, increase the output of the resin, reduce the material in the vacuum pump, and reduce the number of vacuum pump maintenance times.

[0022] 3. Add a double-person opening to increase the concentration of the air discharged into the tank, making it easier for personnel to enter the tank for maintenance and improving the safety and reliability of the tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the main structure of the phenolic resin wastewater receiving tank in the embodiment;

[0024] Figure 2A top view structural schematic diagram of a phenolic resin wastewater receiving tank for the embodiment;

[0025] In the figure:

[0026] 1, tank body; 2, supporting leg; I1~I2, manhole; F, vent port; L, online liquid level meter port; P, online pressure gauge port; M, wastewater inlet; Z, vacuum port; pH, online pH meter port; T, online thermometer port; N1, drain port; N2, nitrogen port; N3~N4, water inlet; N5~N6, water outlet; N9, liquid alkali inlet. DETAILED DESCRIPTION

[0027] The utility model will be further described below in combination with the drawings and specific embodiments. It should be understood that these embodiments are only used for illustrating the utility model and are not used for limiting the scope of the utility model.

[0028] Referring to Figure 1 , Figure 2 , a phenolic resin wastewater receiving tank, comprising a tank body 1. The top surface of the tank body 1 is provided with an online pressure gauge port P, an online liquid level meter port L, a vent port F, a vacuum port Z, a wastewater inlet M, a liquid alkali inlet N9 and a nitrogen port N2. The vent port F is connected with a vent valve. The bottom of the tank body 1 is provided with a drain port N1, an online thermometer port T, an online pH meter port pH and a supporting leg 2. The drain port N1 is connected with a discharge valve. The online pH meter port pH is interlocked with the liquid alkali inlet N9. The tank body 1 is further provided with two manholes I1, I2, which are located at opposite positions on the side surface of the tank body 1.

[0029] As Figure 1 shown, the phenolic resin wastewater receiving tank of the embodiment further comprises two sets of temperature control outer coils which are independently controlled and located at different heights outside the tank body 1. The lower end of the temperature control outer coil is a water inlet N3, N4, and the upper end is a water outlet N5, N6. One set of temperature control outer coils is used for feeding cooling water from the water inlet N3 and discharging cooling water from the water outlet N5; the other set of temperature control outer coils is used for feeding cooling water from the water inlet N4 and discharging cooling water from the water outlet N6. The cooling water in the temperature control outer coil flows from the lower end to the upper end.

[0030] When the phenolic resin wastewater receiving tank of the embodiment is used, vacuum dewatering is performed through automatic operation of DCS, the vacuum pump is automatically opened, vacuum negative pressure first comes to the receiving tank through the vacuum port Z, and then comes to the condenser through the wastewater inlet M and then comes to the reaction kettle, the vacuum degree value slowly increases, the water contained in the resin in the reaction kettle slowly enters the condenser for cooling, the water temperature is still very high, and the water enters the receiving tank through the wastewater inlet M from the pipeline.

[0031] The on-line temperature meter of the receiving tank at the temperature meter port T automatically interlocks to control the water temperature at the set temperature, and the two sets of independently controlled temperature control outer coil pipes are opened. When the temperature approaches the lower limit of the set temperature, the temperature control outer coil pipe stops feeding water, and the water discharged and the water in the tank are mixed to increase the temperature.

[0032] The on-line pH meter of the receiving tank at the pH meter port pH automatically interlocks to control the pH of the water at the set value. When the value is low, the liquid alkali inlet N9 is interlocked, and the liquid alkali is automatically added to dissolve the small molecular resin in the water. When the value is high, the addition of liquid alkali is automatically stopped.

[0033] The on-line liquid level meter at the liquid level meter port L and the on-line pressure meter at the pressure meter port P of the receiving tank automatically interlock with the dehydration temperature of the reaction kettle, the dehydration temperature control coil heating and cooling switch, and the vacuum pump switch. When the on-line liquid level of the receiving tank reaches the set value, the temperature set value of the reaction kettle is automatically adjusted to 25-30°C, the reaction kettle temperature is interlocked, the dehydration temperature control coil is stopped heating, the cooling water is opened for cooling, and when the temperature reaches the set value, the vacuum pump is closed, the venting valve at the venting port F of the receiving tank is opened, and the pressure in the receiving tank is released. The reaction kettle can be sampled for detection.

[0034] In actual production, when the dehydration temperature in the reaction kettle is 50-55°C according to process requirements, the water temperature of the discharged water after passing through the condenser is 40-45°C to the dehydration receiving tank. Because the residence time of the discharged water in the condenser is short, the heat exchange time is short, even if the circulating water temperature in the condenser is lower, the water temperature decreases slowly, and the temperature is still very high. The water temperature in the receiving tank is high, according to the rationality of the equipment connection, the vacuum pump is connected with the vacuum port of the receiving tank, the high water temperature is more easily taken to the vacuum pump by the negative pressure of the vacuum pump, the pipeline of the vacuum pump is blocked, and the vacuum degree of the vacuum pump is reduced. The reduction of the vacuum degree leads to the increase of the dehydration temperature of the reaction kettle, which in turn increases the water temperature of the receiving tank to a certain extent. The higher the dehydration temperature of the reaction kettle, the more likely it is to bring out the small molecules in the resin, reducing the production of the resin in the reaction kettle, and the production of the resin is low. The process requires that the dehydration temperature is in the dehydration temperature range verified by the customer's use. When the dehydration temperature is higher than the process requirement of the resin, the production workshop will control the dehydration temperature, reduce the amount of steam or heat conducting oil to the coil pipe in the reaction kettle, leading to the extension of the dehydration time and the increase of the energy consumption.

[0035] The cooling water coil is preferably at least two sets, located at different heights outside the receiving tank body 1, and independently controlled. The cooling water enters the coil from the water inlets N3, N4, and exits from the water outlets N5, N6.

[0036] The drain port N1 of the receiving tank bottom can increase the discharge valve of the DCS automatic control, and after the DCS automatic production of the resin in the kettle is completed, the wastewater is automatically discharged. At present, after the large-scale production of phenolic resin, the volume of the reaction kettle and the volume of the receiving tank are increased, the production amount of the resin is large, the dehydration time is long itself, the water discharged in the receiving tank stays for 16-22 hours, and when the temperature of the receiving tank decreases, the resin is also precipitated. The resin in the water can not block the pipeline, and the maintenance frequency of the receiving tank is reduced.

[0037] In addition, it should be understood that, after reading the above description of the present application, those skilled in the art can make various modifications or modifications to the present application, and these equivalent forms also fall within the scope defined by the claims attached to the present application.

Claims

1. A phenolic resin wastewater receiving tank, characterized in that: comprising a tank body (1); The top surface of the tank body (1) is provided with an online pressure gauge port (P), an online liquid level gauge port (L), a vent port (F), a vacuum port (Z), a wastewater inlet (M), a liquid alkali inlet (N9) and a nitrogen port (N2).

2. The phenolic resin wastewater receiving tank according to claim 1, characterized in that: The phenolic resin wastewater receiving tank further comprises one or more sets of temperature-controlled external coils that are independently controlled and located at different heights outside the tank body (1).

3. The phenolic resin wastewater receiving tank according to claim 2, characterized in that: The lower end of the temperature-controlled outer coil is a water inlet, and the upper end is a water outlet.

4. The phenolic resin wastewater receiving tank according to claim 1, characterized in that: The tank body (1) is provided with at least two manholes, wherein the two manholes are respectively located at opposite positions on the side of the tank body (1).

5. The phenolic resin wastewater receiving tank according to claim 1, characterized in that: A drain outlet (N1) is provided at the bottom of the tank body (1); The drain port (N1) is connected to the drain valve.

6. The phenolic resin wastewater receiving tank according to claim 1, characterized in that: An online thermometer port (T) is provided at the bottom of the tank body (1).

7. The phenolic resin wastewater receiving tank according to claim 1, characterized in that: An online pH meter port (pH) is provided at the bottom of the tank body (1).

8. The phenolic resin wastewater receiving tank according to claim 7, characterized in that: The online pH meter port (pH) is linked to the liquid alkali inlet (N9).

9. The phenolic resin wastewater receiving tank according to claim 1, characterized in that: The bottom of the tank body (1) is provided with supporting feet (2).

10. The phenolic resin wastewater receiving tank according to claim 1, characterized in that: Connect the vent port (F) to the vent valve.

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