RO (Reverse Osmosis) acetic acid recovery system

Abstract

The utility model provides an RO (Reverse Osmosis) acetic acid recovery system. The RO acetic acid recovery system comprises an RO water inlet buffer tank, a primary reverse osmosis membrane group and a secondary reverse osmosis membrane group, the liquid inlet end of the RO water inlet buffer tank is connected with an RO water inlet pipe; the output end of the buffer tank is sequentially connected with a reverse osmosis low-pressure pump and a reverse osmosis high-pressure pump through a conveying pipeline; the output end of the reverse osmosis high-pressure pump is connected with the primary reverse osmosis membrane group through a pipeline; one end, provided with a double-pipeline output end, of the second-stage reverse osmosis membrane group is connected with a liquid inlet end of the first-stage RO water production tank, and the other end of the second-stage reverse osmosis membrane group is connected with a liquid return opening of the RO water inlet buffer tank; the penetrating fluid conveying pump is connected with the sewage treatment device through an output pipeline; and a conveying pipeline connected with a liquid return port of the secondary RO water production tank is arranged on the output pipeline between the penetrating fluid conveying pump and the sewage treatment device. According to the RO acetic acid recovery system disclosed by the utility model, the recovery rate of acetic acid in water is improved, the consumption of fresh acetic acid is reduced and considerable economic benefits are brought to enterprises by arranging two groups of reverse osmosis membrane group operation loads.

Description

TECHNICAL FIELD

[0001] The utility model relates to in RO acetic acid recovery process system technical field especially relates to a kind of RO acetic acid recovery system. BACKGROUND

[0002] PTA (pure terephthalic acid) is important raw material of synthesis polyester, is with p-xylene as raw material, acetic acid as solvent, is generated under certain temperature and pressure with air oxidation.In traditional PTA production system, acetic acid recovery rate is smaller, sewage treatment cost is big, influence PTA's production cost, while in sewage, acetic acid content in wastewater is larger, can cause environmental pollution, increase enterprise production cost. UTILITY MODEL CONTENT

[0003] The utility model provides a kind of RO acetic acid recovery system, solve the problem of acetic acid recovery rate in traditional RO acetic acid recovery process system is smaller, sewage treatment cost is big, influence PTA's production cost, while in sewage, acetic acid content in wastewater is larger, can cause environmental pollution, increase enterprise production cost problem.

[0004] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0005] A kind of RO acetic acid recovery system, including: RO water buffering tank, primary reverse osmosis membrane group, primary RO water tank, secondary reverse osmosis membrane group, secondary RO water tank and permeate pump;The liquid inlet end of the RO water buffering tank is connected with RO water pipe;The output end of the RO water buffering tank is connected with reverse osmosis low-pressure pump and reverse osmosis high-pressure pump in sequence by conveying pipeline;The output end of the reverse osmosis high-pressure pump is connected with primary reverse osmosis membrane group by pipeline;Primary reverse osmosis membrane group is equipped with double-pipeline output end one end and is connected with oxidation device, and the other end is connected with the liquid inlet end of one end of primary RO water tank;

[0006] The output end of the primary RO water tank is connected with secondary reverse osmosis membrane group by secondary reverse osmosis feed pump;Secondary reverse osmosis membrane group is equipped with double-pipeline output end one end and is connected with the liquid inlet end of secondary RO water tank, and the other end is connected with the liquid return port of RO water buffering tank;The liquid outlet of the secondary RO water tank is connected with permeate pump;Permeate pump is connected with sewage treatment device by output pipeline;Output pipeline between permeate pump and sewage treatment device is equipped with conveying pipeline connected with the liquid return port of primary RO water tank.

[0007] Further, the primary reverse osmosis membrane group comprises: a primary membrane group one section, a primary membrane group two section and a primary membrane group three section; the output end of the reverse osmosis high-pressure pump is connected with the liquid inlet of the primary membrane group one section through a pipeline; the primary membrane group one section is provided with double-way output pipelines and is connected with the liquid inlet of the primary membrane group two section; the primary membrane group two section is connected with the primary membrane group three section through the double-way output pipelines.

[0008] Further, the double-way output pipelines of the primary membrane group three section, wherein one pipeline is connected with the oxidation device, and the other pipeline is connected with the liquid inlet of the primary RO water tank.

[0009] Further, the secondary reverse osmosis membrane group comprises: a secondary membrane group one section, a secondary membrane group two section and a secondary membrane group three section; the output end of the secondary reverse osmosis feed pump is connected with the liquid inlet of the secondary membrane group one section through a pipeline; the secondary membrane group one section is provided with double-way output pipelines and is connected with the liquid inlet of the secondary membrane group two section; the primary membrane group two section is connected with the primary membrane group three section through the double-way output pipelines.

[0010] Further, the double-way output pipelines of the secondary membrane group three section, wherein one pipeline is connected with the liquid inlet of the secondary RO water tank, and the other end is connected with the liquid return port of the RO water buffer tank.

[0011] The beneficial effects of the utility model lie in:

[0012] The utility model discloses a two groups of reverse osmosis membrane groups running load are set up, and the load of primary and secondary membrane groups is improved, and the secondary RO water is partly returned to the secondary RO water tank from the outlet of the permeate delivery pump, then is transported to the secondary RO reverse osmosis membrane group through the secondary RO secondary reverse osmosis feed pump, and secondary RO recovery is carried out, the acetic acid recovery efficiency is improved, the pollution cost is reduced, and the purpose of saving cost is realized.

[0013] The utility model discloses a multistage reverse osmosis pressure pump is set up, and through the pretreatment system, such as particle filter, activated carbon filter etc., removes big granule, silt, suspended matter, chlorine and part of organic matter, improves the water pressure, makes water can overcome the natural permeation pressure of reverse osmosis membrane, thereby guaranteeing that the reverse osmosis process can proceed smoothly, protects the subsequent reverse osmosis membrane, and greatly improves the acetic acid recovery efficiency. ACCURATE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical schemes of the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0015] Figure 1The utility model discloses a whole schematic view.

[0016] Explanation of the reference signs:

[0017] 1, RO water inlet buffer tank;2, reverse osmosis low pressure pump;3, reverse osmosis high pressure pump;4, primary reverse osmosis membrane group;401, primary membrane group one section;402, primary membrane group two section;403, primary membrane group three section;5, primary RO water tank;6, secondary reverse osmosis feed pump;7, secondary RO water tank;8, secondary reverse osmosis membrane group;801, secondary membrane group one section;802, secondary membrane group two section;803, secondary membrane group three section;9, permeate pump. DETAILED DESCRIPTION

[0018] It should be noted that the embodiments and the features in the embodiments in the utility model can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0019] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative work belong to the scope of protection of the utility model.

[0020] It should be noted that the terms used here are only for describing the specific embodiments, not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "contain" and / or "include" are used in the specification, it means that there are features, steps, operations, devices, components and / or their combinations.

[0021] The foregoing description, for purposes of explanation, sets forth specific values and arrangements of components and steps that are subject to many options. The intent is to be accurate in describing the principles and novel features of the application. Thus, although the application has been described with reference to specific embodiments thereof, it will be apparent to those of ordinary skill in the art that a number of changes can be made to the embodiments described without departing from the spirit and scope of the application. For example, the various features of the application can be combined in any combination, where possible. Accordingly, the scope of the application is to be construed as encompassing modifications and variations of the specific examples described herein, subject only to the conditions of the prior art.

[0022] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the protection scope of the present application: the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0023] For the convenience of description, spatial relative terms such as "on", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0024] In addition, it should be noted that the use of "first", "second" and the like words to limit parts only for the convenience of distinguishing the corresponding parts, and without further declaration, the above words have no special meaning, therefore, it cannot be understood as a limitation on the protection scope of the present application.

[0025] This utility model provides a technical solution: an RO acetic acid recovery system, such as... Figure 1 As shown, it includes: an RO feed water buffer tank 1, a first-stage reverse osmosis membrane module 4, a first-stage RO permeate tank 5, a second-stage reverse osmosis membrane module 8, a permeate tank 7, and a permeate transfer pump 9; the inlet end of the RO feed water buffer tank 1 is connected to the RO feed water pipe; the output end of the buffer tank 1 is connected in sequence to a reverse osmosis low-pressure pump 2 and a reverse osmosis high-pressure pump 3 via a transfer pipeline; the output end of the reverse osmosis high-pressure pump 3 is connected to the first-stage reverse osmosis membrane module 4 via a pipeline; the first-stage reverse osmosis membrane module 4 has a dual-pipeline output end, one end of which is connected to the oxidation device, and the other end is connected to one end of the inlet end of the first-stage RO permeate tank 5;

[0026] The output end of the primary RO permeate tank 5 is connected to the secondary reverse osmosis membrane module 8 via the secondary reverse osmosis feed pump 6; the secondary reverse osmosis membrane module 8 has a dual-pipeline output end, one end of which is connected to the inlet end of the permeate tank 7, and the other end is connected to the return port of the RO feed buffer tank 1; the outlet end of the secondary RO permeate tank 7 is connected to the permeate transfer pump 9; the permeate transfer pump 9 is connected to the wastewater treatment device via an output pipeline; the output pipeline between the permeate transfer pump 9 and the wastewater treatment device is equipped with a transfer pipeline connected to the return port of the primary RO permeate tank 5.

[0027] The primary reverse osmosis membrane module 4 includes: a primary membrane module section 401, a primary membrane module section 402, and a primary membrane module section 403; the output end of the reverse osmosis high-pressure pump 3 is connected to the inlet of the primary membrane module section 401 via a pipeline; the primary membrane module section 401 is provided with dual output pipelines connected to the inlet of the primary membrane module section 402; the primary membrane module section 402 is connected to the primary membrane module section 403 via dual output pipelines.

[0028] The first-stage membrane module has three sections 403 with dual output pipelines. One pipeline is connected to the oxidation unit, and the other pipeline is connected to the inlet of the first-stage RO permeate tank 5.

[0029] The secondary reverse osmosis membrane module 8 includes: a first stage 801, a second stage 802, and a third stage 803; the output end of the secondary reverse osmosis feed pump 6 is connected to the inlet of the first stage 801 via a pipeline; the first stage 801 is provided with dual output pipelines connected to the inlet of the second stage 802; the second stage 802 is connected to the third stage 803 via dual output pipelines.

[0030] The dual-output pipeline of the three-section 803 of the secondary membrane module has one end connected to the inlet of the secondary RO permeate tank 7 and the other end connected to the return port of the RO inlet buffer tank 1.

[0031] The implementation method of this utility model is as follows:

[0032] 1. First, the water to be treated is transported to the RO feed water buffer tank 1 (model F-670), and then pumped into the acetic acid recovery system by the reverse osmosis low-pressure pump 2 (model 3G-651). The feed water first passes through the security filter (model M-651A / B) to remove large particles, and (model M-652A / B) to remove oily substances, and then is pressurized to the required membrane inlet pressure by the reverse osmosis high-pressure pump 3 (model G-652).

[0033] 2. After entering the first stage reverse osmosis membrane module 4 for filtration, the concentrated water enters the second stage membrane module for further filtration. The second stage concentrated water enters the third stage membrane module for further filtration. The third stage concentrated water, i.e., the acetic acid concentrate, is sent to the oxidation unit (model F-506). The permeate from the first stage membrane module 401, the second stage membrane module 402, and the third stage membrane module 403 is combined to form the first stage RO permeate, which enters the first stage RO permeate tank 5 (model F-675).

[0034] 3. The feed water is then transported to the secondary reverse osmosis membrane module 8 via the secondary reverse osmosis feed pump 6 (model G-676). It enters the first stage of filtration in the secondary RO membrane module, and the concentrate enters the second stage membrane module for further filtration. The concentrate from the second stage enters the third stage membrane module for further filtration, and the concentrate from the third stage flows back to the buffer tank 1. The permeate from the first stage 801, the second stage 802, and the third stage 803 of the secondary membrane module are combined to form the secondary RO permeate, which enters the secondary RO permeate tank 7 (model F-691).

[0035] 4. The permeate in the secondary RO permeate tank 7 is discharged into the wastewater treatment device by the permeate transfer pump 9. The permeate is then transported to the primary RO permeate tank through the return transfer pipeline installed on the output pipeline, and then transported to the secondary reverse osmosis membrane module 8 by the secondary reverse osmosis feed pump 6 for secondary RO recovery.

[0036] The RO acetic acid recovery system requires the influent temperature to be controlled between 18-20℃, and the HAC content of the secondary product water should be 5200-5800 mg / L.

[0037] To reduce the acetic acid concentration in the secondary permeate, the feed temperature was controlled between 15-16℃, resulting in an HAC content of 2800-3200 mg / L in the secondary permeate, which was 2000 mg / L lower than before. The acetic acid content in the production wastewater was very high.

[0038] This utility model discloses an RO acetic acid recovery system. By setting two sets of reverse osmosis membrane modules to operate at different loads, the acetic acid recovery rate in water is increased, reducing the consumption of fresh acetic acid and bringing considerable economic benefits to enterprises.

[0039] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and inventive concept of the present application, can make equivalent substitutions or changes within the technical range disclosed by the present application, which should be encompassed in the protection scope of the present application.

Claims

1. A RO acid recovery system characterized by, The application relates to a reverse osmosis water treatment device. The device comprises an RO water inlet buffer tank (1), a first reverse osmosis membrane group (4), a first RO water tank (5), a second reverse osmosis membrane group (8), a second RO water tank (7) and a permeate conveying pump (9); the liquid inlet end of the RO water inlet buffer tank (1) is connected with an RO water inlet pipe; the output end of the RO water inlet buffer tank (1) is connected with a reverse osmosis low-pressure pump (2) and a reverse osmosis high-pressure pump (3) through conveying pipelines in sequence; the output end of the reverse osmosis high-pressure pump (3) is connected with the first reverse osmosis membrane group (4) through a pipeline; the first reverse osmosis membrane group (4) is provided with double-pipeline output ends, one end of which is connected with an oxidation device, and the other end is connected with the liquid inlet end of one end of the first RO water tank (5); the output end of the first RO water tank (5) is connected with the second reverse osmosis membrane group (8) through a second reverse osmosis feed pump (6); the second reverse osmosis membrane group (8) is provided with double-pipeline output ends, one end of which is connected with the liquid inlet end of the second RO water tank (7), and the other end is connected with the liquid return port of the RO water inlet buffer tank (1); the liquid outlet end of the second RO water tank (7) is connected with the permeate conveying pump (9); the output pipeline between the permeate conveying pump (9) and the sewage treatment device is provided with a conveying pipeline connected with the liquid return port of the first RO water tank (5).

2. A RO acid recovery system as claimed in claim 1, wherein, The first reverse osmosis membrane group (4) comprises a first membrane group first section (401), a first membrane group second section (402) and a first membrane group third section (403); the output end of the reverse osmosis high-pressure pump (3) is connected with the liquid inlet port of the first membrane group first section (401) through a pipeline; the first membrane group first section (401) is provided with double-output pipelines connected with the liquid inlet end of the first membrane group second section (402); the first membrane group second section (402) is connected with the first membrane group third section (403) through the double-output pipelines.

3. A RO acid recovery system as claimed in claim 2, wherein, One of the double-output pipelines of the first membrane group third section (403) is connected with the oxidation device, and the other pipeline is connected with the liquid inlet end of the first RO water tank (5).

4. A RO acid recovery system as claimed in claim 1, wherein, The second reverse osmosis membrane group (8) comprises a second membrane group first section (801), a second membrane group second section (802) and a second membrane group third section (803); the output end of the second reverse osmosis feed pump (6) is connected with the liquid inlet port of the second membrane group first section (801) through a pipeline; the second membrane group first section (801) is provided with double-output pipelines connected with the liquid inlet end of the second membrane group second section (802); the first membrane group second section (402) is connected with the first membrane group third section (403) through the double-output pipelines.

5. A RO acid recovery system as claimed in claim 4, wherein, One of the double-output pipelines of the second membrane group third section (803) is connected with the liquid inlet end of the second RO water tank (7), and the other pipeline is connected with the liquid return port of the RO water inlet buffer tank (1).

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