Energy-saving filtering system of stripping tower
By installing a heat exchanger and a pressure regulating valve in the stripping tower system to increase the temperature and pressure of the mother liquor, the problem of agglomeration at the bottom of the tower caused by insufficient mother liquor temperature was solved, achieving the effect of long-term operation of the equipment and reduced energy consumption.
Patent Information
- Application Number
- CN202422927311.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-11-29
AI Technical Summary
In the existing stripping tower during the PTA production process, the mother liquor entering the tower at an insufficient temperature causes benzoic acid and PT acid to precipitate, resulting in agglomeration at the bottom of the tower, affecting equipment operation and possibly clogging. In addition, the energy consumption is high, and existing technologies are difficult to effectively solve this problem.
A heat exchanger is installed between the mother liquor filter and the solvent stripping tower to increase the mother liquor temperature from 99°C to 135°C. A pressure regulating valve is installed at the top of the solvent stripping tower to maintain a pressure of 0.50 barg. Combined with a detachable diversion filter and filter screen, efficient filtration and diversion of the mother liquor can be achieved.
It reduces the use of fresh steam, reduces tower bottom agglomeration, extends the equipment operation cycle, reduces energy consumption and improves filtering effect, and reduces the frequency of manual operations and catalyst consumption.
Smart Images
Figure CN223453744U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of stripping tower, especially relates to a stripping tower energy -conserving filter system. BACKGROUND
[0002] In the latest process PTA production process, part of the filtrate of filter is sent to solvent stripping tower after mother liquor filter (99 DEG C) to recover acetic acid, catalyst, remove system impurities, solvent stripping tower in operation 2-3 months time, the tower bottom will accumulate caked material, cause stripping tower circulating pump inlet to be blocked, need frequently to pump out, inlet to carry out the measures such as alkali bubble, improve operating conditions, when serious, solvent gas tower evaporation capacity cannot be maintained, need to shut down solvent recovery system, alkali washing solvent stripping tower.
[0003] The existing stripping tower technology, many adopt integrated stripping tower and use, but this way, mother liquor is insufficient due to temperature before entering stripping tower, lead to benzoic acid and PT acid etc. analysis, accumulate in the tower bottom, thereby cause material accumulation, influence stripping efficiency, even possibly block the equipment, seriously affect the normal operation of the equipment.
[0004] The applicant has carried out structural transformation to the existing equipment, which can effectively solve the generation of the above technical problems. UTILITY MODEL CONTENTS
[0005] The utility model discloses a solvent stripping tower, and the technical scheme adopted is as follows:
[0006] A kind of stripping tower energy -conserving filter system, including mother liquor filter, solvent stripping tower, circulating pump a and circulating pump b mother liquor filter with the preliminary filtration of mother liquor, mother liquor filter and solvent stripping tower upper portion are connected, solvent stripping tower is connected with circulating pump a and circulating pump b respectively by pipeline, circulating pump b is connected with stripping tower reboiler by pipeline, stripping tower reboiler is connected with solvent stripping tower by pipeline, stripping tower reboiler is also used for material heating.
[0007] The core improvement of the utility model lies in that the pipeline between the mother liquor filter and the solvent stripping tower is provided with a heat exchanger, which is used to increase the temperature of the feed from 99 DEG C to 135 DEG C, thereby reducing the use of fresh steam outside the boundary.
[0008] Preferably, the heat exchanger is detachable for easy maintenance.
[0009] Preferably, a shunt filter is arranged at the inlet of the heat exchanger to achieve the purpose of filtering and shunting.
[0010] Preferably, in order to achieve better filtering effect, the rear part of the flow filter is further provided with a filter screen for impurity filtering.
[0011] Preferably, in order to prevent the bottom of the stripping tower from being blocked, the top of the solvent stripping tower is provided with a pressure regulating valve, the pressure is increased from 0.25 barg to 0.50 barg, the temperature is increased to 126 DEG C at the pump inlet, so that the long-period operation is achieved.
[0012] Compared with the prior art, the utility model has the following advantages
[0013] 1) reduce the out-of-fresh steam use, thereby achieving the purpose of reducing the device operation energy consumption.
[0014] 2) the solvent stripping tower bottom material reduces the agglomeration, the stripping tower circulating pump long-period operation, reduces the manual operation frequency, reduces the flushing amount and the acetic acid consumption.
[0015] 3) the solvent stripping tower bottom material reduces the agglomeration, the relatively constant concentration makes the long-period operation of the thin film evaporator, increases the amount of recovered catalyst, and reduces the consumption of fresh catalyst.
[0016] 4) through the design of the utility model, the filtering effect is better, and the long-period operation of the equipment can be better ensured. BRIEF DESCRIPTION OF DRAWINGS
[0017] The utility model will be further described below in combination with the drawings and examples;
[0018] Fig. 1 It is the working principle diagram of the utility model;
[0019] Fig. 2 It is the heat exchanger structure diagram of the utility model;
[0020] Fig. 3 It is the filter flow divider structure diagram of the utility model.
[0021] In the drawing: 1, solvent stripping tower body; 2, stripping tower reboiler; 3, circulating pump a; 4, circulating pump b; 5, heat exchanger; 6, mother liquor filter; 7 pressure regulating valve. DETAILED DESCRIPTION
[0022] This part will describe the specific embodiments of the utility model in detail, the preferred embodiment of the utility model is shown in the drawings, the role of the drawing is to supplement the description of the written part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.
[0023] Refer to Figs. 1-3As shown,
[0024] The energy-saving filter system of a stripping tower comprises a mother liquor filter 6, a solvent stripping tower 1, a circulating pump a 3 and a circulating pump b 4, the mother liquor filter 6 and the upper part of the solvent stripping tower 1 are communicated, the solvent stripping tower 1 is communicated with the circulating pump a 3 and the circulating pump b 4 through pipelines respectively, the circulating pump b 4 is communicated with a stripping tower reboiler 2 through a pipeline, the stripping tower reboiler 2 is communicated with the solvent stripping tower 1 through a pipeline, characterized by that a heat exchanger 5 is arranged on the pipeline between the mother liquor filter 6 and the solvent stripping tower 1, the heat exchanger 5 is a detachable structure, a shunt filter 5-1 is arranged at the inlet of the heat exchanger 5, a plurality of shunt holes 5-1-1 are arranged on the shunt filter 5-1, a filter screen 5-2 is further arranged at the rear part of the shunt filter 5-1, and a pressure regulating valve 7 is arranged at the top of the solvent stripping tower 1.
[0025] The working principle of the utility model is as follows: in use, firstly, the mother liquor is subjected to preliminary removal of impurities through the mother liquor filter 6, so as to ensure the purity of the liquid, then, the filtered mother liquor is subjected to shunt filtration through the shunt filter 5-1 of the heat exchanger 5, and then is subjected to filtration again through the filter screen 5-2, the temperature of the mother liquor is raised from 99 DEG C to 135 DEG C by using 3.5 barg waste heat steam, so as to reduce the precipitation of benzoic acid and PT acid. The heated mother liquor is subjected to stripping in the solvent stripping tower body 1. The pressure regulating valve 7 at the top of the tower maintains the pressure in the tower at 0.50 barg, so as to improve the solubility of the material and reduce the caking at the bottom of the tower. The circulating pump b 4 extracts the rich liquid from the bottom of the tower through the water outlet pipe, and sends the rich liquid back to the top of the tower, so as to maintain the circulation and uniform distribution of the material, thereby further improving the stripping efficiency and reducing the energy consumption.
[0026] The utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of ordinary skilled persons in the technical field without departing from the purpose of the utility model.
Claims
1. An energy saving filtration system for a stripper column comprising a mother liquor filter (6), a solvent stripper column (1), a circulation pump a (3) and a circulation pump b (4), the mother liquor filter (6) and the upper part of the solvent stripper column (1) being in communication, the solvent stripper column (1) being in communication with the circulation pump a (3) and the circulation pump b (4) through lines, the circulation pump b (4) being in communication with a stripper reboiler (2) through a line, the stripper reboiler (2) being in communication with the solvent stripper column (1) through a line, characterized in that, The heat exchanger (5) is arranged on the pipeline between the mother liquor filter (6) and the solvent stripping tower (1).
2. An energy saving filter system for a stripping column according to claim 1, characterized in that The heat exchanger (5) is of detachable structure.
3. A stripping column energy saving filter system as claimed in claim 2, characterized in that, The heat exchanger (5) is provided with a shunt filter (5-1) at the inlet thereof, and a plurality of shunt holes (5-1-1) are arranged on the shunt filter (5-1).
4. A stripping column energy saving filter system as claimed in claim 3, characterized in that, The rear part of the shunt filter (5-1) is further provided with a filter screen (5-2).
5. The energy saving filter system for a stripping column according to claim 1, wherein The top of the solvent stripping tower (1) is provided with a pressure regulating valve (7).