CN218618251U - A kind of storage and filtering equipment for catalyst hydrochloric acid used in the production of PVB - Google Patents

Abstract

The utility model provides storage and filtration equipment for catalyst hydrochloric acid used in the production of PVB, including a condensation device and a hydrochloric acid storage tank, the condensation device includes a cooling water cavity and a spiral condensation pipe, and a water inlet and an outlet are arranged on the cooling water cavity Water port, the cooling water cavity is installed on the top of the hydrochloric acid storage tank, the spiral condenser tube is placed in the cooling water cavity, and the upper end of the spiral condenser tube protrudes from the top surface of the cooling water cavity , the lower end of the spiral condensing pipe communicates with the top of the hydrochloric acid storage tank, which is characterized in that: a drying device is arranged on the upper end of the spiral condensing pipe, and the bottom of the hydrochloric acid storage tank communicates with a hydrochloric acid filtering device. It can avoid the pollution and harm caused by the discharge of hydrochloric acid mist into the atmosphere, avoid the volatilization of hydrochloric acid from affecting the concentration of hydrochloric acid in the storage tank, avoid air impurities and water vapor introduced during the condensation process of hydrochloric acid, and solve the problem of direct input of hydrochloric acid from the storage tank Purity issues for production use.

Description

A kind of storage and filtering equipment for catalyst hydrochloric acid used in the production of PVB

technical field

The utility model belongs to the technical field of chemical production equipment, in particular to storage and filtration equipment for catalyst hydrochloric acid used in the production of PVB.

Background technique

In the process of PVB industrial production, under the action of catalyst hydrochloric acid, butyraldehyde and polyvinyl alcohol undergo acetalization reaction. The factory usually dissolves polyvinyl alcohol with a solvent and then adds butyraldehyde and hydrochloric acid of a certain purity and concentration at a certain temperature. Under stirring, the acetal reaction for producing PVB is completed under the catalysis of hydrochloric acid.

In the process of industrial production of PVB, it is necessary to reserve a large amount of raw materials and acids to ensure that they can continuously enter the production line during production. Butyraldehyde and hydrochloric acid need to be distilled and purified by special equipment before use, which also prolongs the production cycle and causes energy consumption. The special distillation equipment also takes up extra volume, complicated pipelines, and increases production and maintenance costs. Therefore, it is necessary to design a storage and filtration equipment for hydrochloric acid, which requires simple structure, low cost, and easy maintenance to realize the storage and purification of hydrochloric acid.

Under normal circumstances, the factory stores the newly transported hydrochloric acid in a special hydrochloric acid storage tank, and then leads to the production line. The hydrochloric acid storage tank is connected to the atmosphere to ensure the smooth output of hydrochloric acid, and the storage tank is under normal pressure. However, the concentration of newly produced hydrochloric acid from newly shipped factories is generally around 31%, and its temperature is often higher than atmospheric temperature. Volatility is a characteristic of hydrochloric acid itself. When the temperature of hydrochloric acid is different from the atmospheric temperature, or when the atmospheric pressure is lower, a large amount of hydrochloric acid will volatilize. Therefore, the volatilization problem of hydrochloric acid urgently needs to be solved. The acid mist from the volatilization of hydrochloric acid not only pollutes the air, but also wastes resources and increases costs. In addition, in the factory where hydrochloric acid storage tanks are concentrated, there will be a strong smell of hydrochloric acid, which will cause harm to the human body.

Chinese patent (application number 201420390504.4) discloses that the utility model relates to a hydrochloric acid storage tank condensation demister device, which includes a condensation pipe, the condensation pipe is a spiral acid mist condensation pipe, and the pipe body is bent in a spiral shape; the spiral acid mist condensation The pipe vertically passes through the barrel with built-in cooling water, and the upper and lower ports of the pipe are respectively connected to the atmosphere and the hydrochloric acid in the hydrochloric acid storage tank; the barrel is provided with cooling water pipes for entering and discharging the cooling water. This patent utilizes the condensing pipe leading into the circulating water to condense the volatilized hydrochloric acid back into the storage tank, which saves the production cost and protects the natural environment.

The problems of the above-mentioned patents are as follows:

1. This kind of hydrochloric acid storage tank whose upper end is connected to the atmosphere will undoubtedly introduce impurities and water vapor in the atmosphere, which will have a certain impact on the concentration and purity of hydrochloric acid in the storage tank.

2. There is no acidity detector in the hydrochloric acid storage tank, so it is impossible to control the quality of hydrochloric acid in the storage tank in real time.

3. The hydrochloric acid in the storage tank cannot be directly put into production and use, and a filtration purification device needs to be installed.

Therefore, how to design a storage and filtration equipment for the catalyst hydrochloric acid used in the production of PVB, avoid the pollution and harm caused by the discharge of hydrochloric acid mist into the atmosphere, avoid the volatilization of hydrochloric acid from affecting the concentration of hydrochloric acid in the storage tank, and avoid the introduction of hydrochloric acid during the condensation process. Air impurities and water vapor, while solving the purity problem of hydrochloric acid directly put into production from the storage tank. These are all technical problems to be solved urgently in this area.

Utility model content

In order to solve the above-mentioned problems existing in the prior art, the utility model provides a storage and filtering device for hydrochloric acid catalyst used in the production of PVB, which avoids the pollution and harm caused by the discharge of hydrochloric acid mist into the atmosphere, and avoids the volatilization of hydrochloric acid from affecting the hydrochloric acid in the storage tank. Concentration, to avoid air impurities and water vapor introduced by hydrochloric acid during the condensation process, and at the same time solve the purity problem of hydrochloric acid directly put into production from the storage tank.

The purpose of this utility model is achieved by the following technical solutions:

A kind of storage and filtering equipment for catalyst hydrochloric acid used in the production of PVB, comprising a condensing device and a hydrochloric acid storage tank, the condensing device includes a cooling water cavity and a spiral condensation pipe, the cooling water cavity is provided with a water inlet and a water outlet, the The cooling water cavity is installed on the top of the hydrochloric acid storage tank, the spiral condenser tube is placed in the cooling water cavity, the upper end of the spiral condenser tube protrudes from the top surface of the cooling water cavity, and the spiral condenser The lower end of the condensation pipe communicates with the top of the hydrochloric acid storage tank. It is characterized in that a drying device is arranged on the upper end of the spiral condensation pipe, and the bottom of the hydrochloric acid storage tank communicates with a hydrochloric acid filtering device.

Improvement to the above technical solution: the drying device is a drying cup with closed upper and lower ports, the lower port of the drying cup is connected to the upper end of the spiral condenser tube, and the drying cup is built with desiccant particles.

A further improvement to the above technical solution: a metering device and a reaction device are arranged successively on the pipeline drawn from the bottom of the hydrochloric acid filtering device.

A further improvement to the above technical solution: a valve is set on the pipeline connecting the hydrochloric acid filtering device and the metering device.

A further improvement to the above technical solution: a pH detection device is installed in the hydrochloric acid storage tank.

A further improvement to the above technical solution: the filter element in the hydrochloric acid filtration device is a filter element for hydrochloric acid filtration.

A further improvement to the above technical solution: the middle part of the hydrochloric acid storage tank is cylindrical, the top and bottom of the hydrochloric acid storage tank are both narrowed, and the bottom of the hydrochloric acid storage tank is provided with a bracket.

Advantage and positive effect of the present utility model are:

1. The utility model has the characteristics of simple structure and easy disassembly, which avoids the problem of high maintenance cost caused by complex structure;

2. The utility model prevents impurities in the air from entering the hydrochloric acid storage tank;

3. The utility model combines various devices in one hydrochloric acid storage tank, and completes the high-quality storage of hydrochloric acid with less cost;

4. The utility model avoids the environmental problems caused by the leakage of hydrochloric acid mist, and can recycle the acid mist volatilized by hydrochloric acid;

5. The utility model can realize that after the hydrochloric acid is filtered through the filter element, there is no need to distill it again, and it can be directly put into use;

6. The utility model is equipped with a pH detection device in the hydrochloric acid storage tank, which can feed back the pH value of the hydrochloric acid in the hydrochloric acid storage tank in real time;

7. The utility model improves production efficiency, saves energy consumption, improves production standards, and creates conditions for high-quality PVB production.

Description of drawings

Fig. 1 is a connection structure schematic diagram of a kind of storage and filtration equipment for producing PVB catalyst hydrochloric acid used in the utility model.

The numbers in the figure are: 1-drying device, 2-condensing device, 3-hydrochloric acid storage tank, 4-pH detection device, 5-hydrochloric acid filtering device, 6-support, 7-valve, 8-metering device, 9-reaction device .

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail:

Referring to Fig. 1, a kind of embodiment of the storage filter equipment of the used catalyst hydrochloric acid of the production of PVB of the present utility model comprises condensing device 2 and hydrochloric acid storage tank 3, and described condensing device 2 comprises cooling water cavity and spiral condensation pipe, and described cooling A water inlet and a water outlet are arranged on the water cavity, and the cooling water cavity is installed on the top of the hydrochloric acid storage tank 3, and the spiral condensation pipe is placed in the cooling water cavity, and the upper end of the spiral condensation pipe extends Out of the top surface of the cooling water cavity, the lower end of the spiral condenser tube communicates with the top of the hydrochloric acid storage tank 3, the upper end of the spiral condensation tube is provided with a drying device 1, and the bottom of the hydrochloric acid storage tank 3 It communicates with a hydrochloric acid filter device 5.

Specifically: the above drying device 1 is a drying cup with closed upper port and lower port, the lower port of the drying cup is docked with the upper end of the spiral condenser tube, and the drying cup is built with desiccant particles.

Further, a metering device 8 and a reaction device 9 are arranged successively on the pipeline drawn from the bottom of the above-mentioned hydrochloric acid filtering device 5 .

Still further, a valve 7 is provided on the pipeline connecting the hydrochloric acid filtering device 5 and the metering device 8 .

Still further, a pH detection device is provided in the above-mentioned hydrochloric acid storage tank 3 .

Preferably, the filter element in the hydrochloric acid filtration device 5 is a filter element for hydrochloric acid filtration.

Further, the middle part of the hydrochloric acid storage tank 3 is cylindrical, the top and the bottom of the hydrochloric acid storage tank 3 are both narrowed, and the bottom of the hydrochloric acid storage tank 3 is provided with a bracket 6 .

When in use, put the desiccant particles that do not react with hydrochloric acid into the drying cup of the drying device 1, and the condensed water enters it from the water inlet below the cooling water cavity of the condensing device 2, and after cooling the spiral condenser tube, the condensed water Then flow out from the water outlet above the cooling water cavity.

Inject and store the hydrochloric acid in the storage tank 3. When the hydrochloric acid gas volatilizes, the condensing device 2 can cool the hydrochloric acid gas and re-collect it and then flow it back into the hydrochloric acid storage tank 3. In addition, the drying device 1 above can absorb the water vapor in the air , while blocking the dust impurities in the air. The hydrochloric acid storage tank 3 is equipped with a pH detection device 4, which can feed back the pH value of the hydrochloric acid in the storage tank in real time. The hydrochloric acid filtration device 5 below the storage tank 3 adopts a filter element for hydrochloric acid filtration, which can filter hydrochloric acid under the action of gravity. After filtering, the hydrochloric acid can be directly put into the reaction device 9 according to the dosage through the metering device 8 for use after passing through the valve 7.

During production, the hydrochloric acid after filtering and purifying can flow into the metering device 8 by opening the valve 7, and then drop into the reaction device 9 according to the required amount.

The above description is not a limitation to the present utility model, and the present utility model is not limited to the above-mentioned examples. Any changes, modifications, additions or replacements made within the essential scope of the present utility model by those of ordinary skill in the art are also acceptable. Should belong to the protection scope of the present utility model.

Claims (10)

1. a kind of storage filter equipment that produces the used catalyst hydrochloric acid of PVB, comprise condensing unit and hydrochloric acid storage tank, described condensing unit comprises cooling water cavity and spiral condensation pipe, water inlet and water outlet are set on the described cooling water cavity, The cooling water cavity is installed on the top of the hydrochloric acid storage tank, the spiral condenser tube is placed in the cooling water cavity, and the upper end of the spiral condenser tube protrudes from the top surface of the cooling water cavity, so The lower end of the spiral condensing pipe communicates with the top of the hydrochloric acid storage tank, and it is characterized in that a drying device is arranged on the upper end of the spiral condensing pipe, and the bottom of the hydrochloric acid storage tank communicates with a hydrochloric acid filtering device. 2. the storage filtration equipment of the used catalyst hydrochloric acid of producing PVB according to claim 1, it is characterized in that, described drying device is that upper port and lower port are the dry cup that closes up, and the lower port of described dry cup and described The upper end of the spiral condenser tube is butted, and the drying cup is built with desiccant particles. 3. according to claim 1 and 2 described production PVB used catalyst hydrochloric acid storage filter equipment, it is characterized in that, the pipeline that the bottom of described hydrochloric acid filter device draws is provided with metering device and reaction unit successively. 4. the storage filtration equipment of the used catalyst hydrochloric acid of producing PVB according to claim 3, is characterized in that, valve is set on the pipeline that is connected between described hydrochloric acid filtering device and described metering device. 5. the storage filtering equipment of the used catalyst hydrochloric acid of producing PVB according to claim 1 and 2, is characterized in that, pH detection device is set in the described hydrochloric acid storage tank. 6. the storage filtration equipment of the used catalyst hydrochloric acid of producing PVB according to claim 4, is characterized in that, pH detection device is set in the described hydrochloric acid storage tank. 7. according to claim 1 and 2 described production PVB used catalyzer hydrochloric acid storage filter equipment, it is characterized in that, the filter core in the described hydrochloric acid filter unit is the filter core for hydrochloric acid filtration. 8. the storage filtering equipment of the used catalyst hydrochloric acid of producing PVB according to claim 6, is characterized in that, the filter core in the described hydrochloric acid filtering device is the filter core for hydrochloric acid filtration. 9. according to claim 1 and 2 described production PVB used catalyst hydrochloric acid storage filtering equipment, it is characterized in that, the middle part of described hydrochloric acid storage tank is cylindrical, and the top and the bottom of described hydrochloric acid storage tank are diameter reducing To close the mouth, a bracket is set on the bottom of the hydrochloric acid storage tank. 10. the storage filtration equipment of the used catalyst hydrochloric acid of producing PVB according to claim 8, it is characterized in that, the middle part of described hydrochloric acid storage tank is cylindrical, and the top and the bottom of described hydrochloric acid storage tank are diameter-reducing closing, A support is arranged on the bottom of the hydrochloric acid storage tank.

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