CN219355269U - PTA dehydration tower device capable of improving energy efficiency - Google Patents

Abstract

The utility model relates to the field of PTA production equipment, in particular to a PTA dehydration tower device capable of improving energy efficiency, which comprises a dehydration tower, a reactor and a refining unit, wherein a tower bottom liquid output pipeline is arranged at the bottom of the dehydration tower, the tower bottom liquid output pipeline is connected to the reactor, a gas pipeline on the reactor is connected to the bottom of the dehydration tower, a mother liquor return pipe of the refining unit is connected to the middle part of the dehydration tower, a process water spray pipe is arranged at the upper part of the dehydration tower, a gas phase discharge pipe is arranged at the top of the dehydration tower, and a process water extraction pipe is arranged at the middle upper part of the dehydration tower; the mother liquor return pipe is provided with a mother liquor branch pipe which extends to the bottom of the dehydration tower, and the mother liquor branch pipe is provided with a control valve. When the load of the reactor is lifted, part of PTA refined mother liquor can be directly introduced into the bottom of the dehydration tower, and the spraying amount of the mother liquor is reduced, so that the spraying amount of process water can be correspondingly increased, the risk of flooding caused by the rising of the tower pressure is reduced, and the separation efficiency of the dehydration tower is improved.

Description

PTA dehydration tower device capable of improving energy efficiency

Technical Field

The utility model relates to the field of PTA production equipment, in particular to a PTA dehydration tower device capable of improving energy efficiency.

Background

In the prior art, in the PTA preparation process, gas rich in acetic acid is generated, and dehydration and deacidification treatment are carried out through a dehydration tower. And the refined mother liquor generated in the refining unit also enters a dehydration tower for spray recycling. But the reactor and dehydration column in actual production, the dehydration column spray contains clean process water and PTA mother liquor from the refining. The flow rate of the process water at the top of the dehydration tower is controlled by the production load and the target water concentration of the reactor, the control requirement of the water concentration of the reactor determines the separation efficiency of the dehydration tower, and the operation space is small in the aspect of controlling the separation efficiency of the dehydration tower under the full load. If the load is continuously lifted, the gas phase flow and the gas speed of the reactor are increased, the corresponding tower top reflux quantity is also increased, and the pressure difference of the dehydration tower is increased. Meanwhile, the load of the reactor is increased, the amount of refined mother liquor is relatively increased, PTA refined mother liquor contains a small amount of PT acid and 2% -3% of acetic acid, the PTA refined mother liquor cannot be sent to a sewage treatment unit and only can enter a dehydration tower, the spray flow of the PTA refined mother liquor is increased, the spray process water flow of the tower top is reduced, the separation efficiency of the dehydration tower is reduced, and the acetic acid loss is increased.

Disclosure of Invention

The utility model aims to solve the technical defects and provide the PTA dehydration tower device capable of improving the energy efficiency, after the load of a reactor is improved, part of refined mother liquor is led to the bottom of the dehydration tower, and the spraying flow of the refined mother liquor is reduced, so that the spraying amount of process water is relatively increased, and meanwhile, the pressure difference of the dehydration tower is reduced.

The utility model discloses a PTA dehydration tower device capable of improving energy efficiency, which comprises a dehydration tower, a reactor and a refining unit, wherein a tower bottom liquid output pipeline is arranged at the bottom of the dehydration tower, the tower bottom liquid output pipeline is connected to the reactor, a delivery pump is arranged on the tower bottom liquid output pipeline, a gas pipeline on the reactor is connected to the bottom of the dehydration tower, a mother liquor return pipe of the refining unit is connected to the middle part of the dehydration tower, a process water spray pipe is arranged at the upper part of the dehydration tower, a gas phase discharge pipe is arranged at the top of the dehydration tower, and a process water extraction pipe is arranged at the middle upper part of the dehydration tower; the mother liquor return pipe is provided with a mother liquor branch pipe which extends to the bottom of the dehydration tower, and the mother liquor branch pipe is provided with a control valve.

As optimization, a one-way valve, a flow regulating valve and an electromagnetic flowmeter are sequentially arranged on a mother liquor branch pipe between the control valve and the dehydration tower from the dehydration tower to the control valve.

Preferably, a bottom liquid return pipe is arranged on the bottom liquid output pipeline between the delivery pump and the reactor, and the bottom liquid return pipe extends to the bottom of the dehydration tower.

Preferably, the mother liquor branch pipe is connected to the bottom liquor return pipe.

According to the PTA dehydration tower device capable of improving energy efficiency, when the load of the reactor is improved, part of PTA refined mother liquor can be directly introduced into the bottom of the dehydration tower, so that the spraying amount of mother liquor is reduced, the spraying amount of process water can be correspondingly increased, the risk of flooding caused by the increase of tower pressure is reduced, and meanwhile, the separation efficiency of the dehydration tower is improved.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present utility model with reference to the accompanying drawings and preferred embodiments.

Example 1:

as shown in fig. 1, the utility model discloses a PTA dehydration tower device capable of improving energy efficiency, which comprises a dehydration tower 1, a reactor 2 and a refining unit 16, wherein a tower bottom liquid output pipeline 5 is arranged at the bottom of the dehydration tower 1, the tower bottom liquid output pipeline 5 is connected to the reactor 2, a delivery pump 6 is arranged on the tower bottom liquid output pipeline 5, a gas pipeline 4 on the reactor 2 is connected to the bottom of the dehydration tower 1, a mother liquor return pipe 3 of the refining unit 16 is connected to the middle part of the dehydration tower 1, a process water spray pipe 9 is arranged at the upper part of the dehydration tower 1, a gas phase discharge pipe 10 is arranged at the top of the dehydration tower 1, and a process water extraction pipe 8 is arranged at the middle upper part of the dehydration tower 1; a mother liquor branch pipe 7 is arranged on the mother liquor return pipe 3, the mother liquor branch pipe 7 extends to the bottom of the dehydration tower 1, and a control valve 12 is arranged on the mother liquor branch pipe 7.

A check valve, a flow rate regulating valve 14 and an electromagnetic flowmeter 13 are arranged on the mother liquor branch pipe 7 between the control valve 12 and the dehydration tower 1 in sequence from the dehydration tower 1 to the control valve 12.

A bottom liquid return pipe 11 is provided in the bottom liquid outlet line 5 between the transfer pump 6 and the reactor 2, said bottom liquid return pipe 11 extending to the bottom of the dehydration column 1.

The mother liquor branch pipe 7 is connected to a bottom liquor return pipe 11.

Wherein the reactor 2, the dehydration tower 1 and the refining unit 16 are all products in the prior art, a spraying system is arranged in the reactor 2, a tower bottom liquid output pipeline 5 is connected to the spraying system of the reactor 2, and a conveying pump 6 conveys liquid in the dehydration tower 1 to the spraying system of the reactor 2 for spraying. The dehydration tower 1 comprises 65 layers of double-valve trays and an upper layer of liquid collecting tray, a process water extraction pipe 8 is arranged on the dehydration tower 1 at the liquid collecting tray to convey process water in the liquid collecting tray outwards, and after the process water is used, part of the process water enters a production system, and part of the process water returns to the dehydration tower 1 through a PTA refined mother liquor return pipe 3 to be recycled. The mother liquor return pipe 3 is connected to the trays of the 35 th layer, the 39 th layer and the 43 rd layer of the dehydration tower 1 for spraying. The condensed water cooled in the gas discharged from the gas phase discharge pipe 10 at the top of the dehydration column 1 is supplied to the process water spray pipe 9 to supply spray water inside the dehydration column 1.

When the reactor 2 is in normal operation and the dehydration tower 1 is in a full-load or high-load operation state, the load of the reactor 2 is continuously increased, so that the amounts of the gas phase generated by the reactor 2 and the purification mother liquor generated by the purification unit 16 are relatively increased, and the spraying amount of the process water needs to be increased in order to smoothly collect acetic acid in the gas phase. As the dehydration tower 1 is in full-load or high-load operation, the spraying amount of process water is improved, and the spraying amount of refined mother liquor is correspondingly increased, the 35 th layer, 39 th layer, 43 th layer tower tray and an upper liquid collecting tower tray of the dehydration tower 1 are flooded, and the pressure difference of the dehydration tower 1 is increased. At this time, the control valve 12 on the mother liquor branch pipe 7 can be opened, part of the refined mother liquor is directly drained to the bottom of the dehydration tower 1 through the mother liquor branch pipe 7, and the drainage amount of the refined mother liquor can be controlled through the flow control valve 14. The diversion of the refining mother liquor can reduce the spraying of the refining mother liquor on the trays of the 35 th layer, the 39 th layer and the 43 rd layer of the dehydrating tower 1, thereby ensuring that the pressure difference of the dehydrating tower 1 is in a reasonable range under the condition of increasing the spraying of process water, ensuring the safety and stability of the whole production process, and simultaneously improving the load of the dehydrating tower 1, so that the energy efficiency of the process tower is improved.

In the actual use process, the flow of refined mother liquor drained to the bottom of the dehydration tower 1 can be regulated according to the production load, and overhigh liquid at the bottom of the dehydration tower 1, even diffuse tower, caused by stopping the reactor 2 can be prevented.

The mother liquor branch pipe 7 near one end of the bottom liquor return pipe 11 is provided with a check valve 15, so that the process water with higher acetic acid concentration can be effectively prevented from flowing back into the PTA refined mother liquor.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be in interaction relationship with two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The above description is only of the preferred embodiments of the present utility model, and is not intended to limit the present utility model

Although the present utility model has been described with respect to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications can be made without departing from the scope of the utility model, and that any such simplified changes, equivalents, and modifications as described in the above embodiments are intended to be included within the scope of the utility model.

Claims (4)

1. The utility model provides a but PTA dehydration tower device of lifting energy efficiency, includes dehydration tower, reactor, refining unit, characterized by: a bottom liquid output pipeline is arranged at the bottom of the dehydration tower, the bottom liquid output pipeline is connected to the reactor, a delivery pump is arranged on the bottom liquid output pipeline, a gas pipeline on the reactor is connected to the bottom of the dehydration tower, a mother liquor return pipe of the refining unit is connected to the middle part of the dehydration tower, a process water spray pipe is arranged at the upper part of the dehydration tower, a gas phase discharge pipe is arranged at the top of the dehydration tower, and a process water extraction pipe is arranged at the middle upper part of the dehydration tower; the mother liquor return pipe is provided with a mother liquor branch pipe which extends to the bottom of the dehydration tower, and the mother liquor branch pipe is provided with a control valve.

2. The PTA dehydration tower apparatus capable of improving energy efficiency according to claim 1, wherein: a one-way valve, a flow regulating valve and an electromagnetic flowmeter are sequentially arranged on a mother liquor branch pipe between the control valve and the dehydration tower from the dehydration tower to the control valve.

3. The PTA dehydration tower device capable of improving energy efficiency according to claim 2, wherein: and a bottom liquid return pipe is arranged on a bottom liquid output pipeline between the delivery pump and the reactor, and the bottom liquid return pipe extends to the bottom of the dehydration tower.

4. The PTA dehydration tower apparatus capable of improving energy efficiency according to claim 3, wherein: the mother liquor branch pipe is connected to the bottom liquor return pipe.