Device for concentrating organic acid in cyclohexanone wastewater

Abstract

The utility model relates to a device for concentrating organic acid in cyclohexanone wastewater, which comprises a raw material tank, a discharge port of the raw material tank is connected with a pervaporation membrane chamber through a pipeline via a raw material pump, the pervaporation membrane chamber is connected with a feed port of a condenser through a conveying device, and the pervaporation membrane chamber is further connected with the top of the raw material tank through a pipeline. And a discharge port of the condenser is connected with a feed port at the upper part of the gas-liquid separator through a liquid conveying device. The continuous separation and enrichment of organic matters in residual wastewater after acidification and layering of cyclohexanone wastewater can be realized, the process is simple, the energy consumption is low, the product yield is high, and the continuous separation and enrichment device is suitable for industrial production.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a device for concentrating organic acid in cyclohexanone wastewater. Background Art

[0002] Cyclohexanone is an important organic chemical raw material. The main processes for the industrial production of cyclohexanone are the cyclohexene method and the cyclohexane method. During the oxidation process of cyclohexane to prepare cyclohexanone, certain organic acids and esters are produced due to the deep oxidation of cyclohexane and the decomposition of cyclohexyl hydroperoxide. Then, sodium hydroxide aqueous solution is used for neutralization and saponification, generating a large amount of organic acid sodium salt dissolved in the aqueous phase, thereby forming a large amount of saponification waste alkali liquid.

[0003] At present, the main methods for treating saponification waste alkali liquor in industry are incineration and chemical treatment. Most enterprises adopt incineration method for treatment, which will inevitably produce dust to pollute the environment. At the same time, a large amount of valuable by-products such as organic acids cannot be effectively recovered, resulting in serious waste of resources. The chemical method mainly involves acidifying the cyclohexanone wastewater first, and then extracting the organic matter from it by distillation, but the device has high energy consumption and low economic value. Summary of the invention

[0004] The purpose of the utility model is to make up for the shortcomings of the prior art and provide a cyclohexanone wastewater organic acid concentration device to achieve continuous separation and enrichment of organic matter after the cyclohexanone wastewater is acidified. The process is simple, the energy consumption is low, the product yield is high, and it is suitable for industrialization.

[0005] The technical solution of this utility model:

[0006] A device for concentrating organic acid in cyclohexanone wastewater comprises a raw material tank, wherein a discharge port of the raw material tank is connected to a pervaporation membrane chamber via a pipeline through a raw material pump, the pervaporation membrane chamber is connected to a condenser feed port via a conveying device, the pervaporation membrane chamber is further connected to the top of the raw material tank via a pipeline, and the discharge port of the condenser is connected to a feed port on the upper part of a gas-liquid separator via an infusion device.

[0007] Preferably, a first liquid feed inlet is provided on the upper side of the raw material tank, and a second liquid feed inlet is provided on the top of the raw material tank.

[0008] Preferably, the gas outlet on the gas-liquid separator is connected to the vacuum pump through a pipeline, and the outlet at the bottom of the gas-liquid separator is connected to the feed port of the product storage tank.

[0009] Further preferably, a stirring paddle is provided inside the raw material tank, and the stirring paddle is a pitch-blade paddle, a compound folding paddle, a double folding paddle or an elliptical paddle.

[0010] Preferably, a pervaporation membrane is provided inside the pervaporation membrane chamber, and the pervaporation membrane divides the pervaporation membrane chamber into two chambers, one side is a liquid phase chamber, and the other side is a gas phase chamber.

[0011] Further preferably, the liquid phase chamber discharge port is connected to the top of the raw material tank through a pipeline, and the gas phase chamber discharge port is connected to the condenser through a pipeline.

[0012] Further preferably, the pervaporation membrane is a symmetric membrane, an asymmetric membrane or a composite membrane.

[0013] Preferably, the condenser is a shell and tube condenser, a plate condenser, a coil condenser or a spray condenser.

[0014] Preferably, the cold gas-liquid separator is a centrifugal gas-liquid separator, a packing gas-liquid separator or a wire mesh gas-liquid separator.

[0015] The utility model has the following beneficial effects:

[0016] The utility model proposes a device for concentrating organic acids in cyclohexanone wastewater. After the cyclohexanone wastewater is acidified and layered, the organic matter in the upper layer contains a large amount of water. If it is directly distilled and dehydrated, the monocarboxylic acid will produce azeotropy with water and cause loss. Adding an azeotroping agent for dehydration introduces new substances, which increases the cost of raw materials. The device is used to concentrate and dehydrate organic acids in cyclohexanone wastewater, which can not only achieve continuous production without introducing new substances, but also has lower energy consumption. The utility model can realize the continuous separation and enrichment of organic matter in the remaining wastewater after the cyclohexanone wastewater is acidified and layered, with a simple process, low energy consumption, high product yield, and is suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] In the figure: 1-raw material tank, 2-raw material pump, 3-permeation vaporization membrane chamber, 4-condenser, 5-gas-liquid separator, 6-product storage tank, 7-vacuum pump. DETAILED DESCRIPTION

[0019] The following will be combined with the specific embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Example 1

[0021] A device for concentrating organic acid in cyclohexanone wastewater comprises a raw material tank 1, wherein a discharge port of the raw material tank 1 is connected to a pervaporation membrane chamber 3 via a pipeline through a raw material pump 2, the pervaporation membrane chamber 3 is connected to a feed port of a condenser 4 via a conveying device, the pervaporation membrane chamber 3 is further connected to the top of the raw material tank 1 via a pipeline, and the discharge port of the condenser 4 is connected to a feed port on the upper part of a gas-liquid separator 5 via an infusion device.

[0022] Preferably, a first liquid feed port 101 is provided on the upper side of the raw material tank 1 , and a second liquid feed port 102 is provided on the top of the raw material tank 1 .

[0023] Preferably, the gas outlet on the gas-liquid separator 5 is connected to the vacuum pump 7 through a pipeline, and the outlet at the bottom of the gas-liquid separator 7 is connected to the feed port of the product storage tank 6 .

[0024] Further preferably, a stirring paddle is provided inside the raw material tank 1, and the stirring paddle is a pitch-blade paddle, a compound folding paddle, a double folding paddle or an elliptical paddle.

[0025] Preferably, a pervaporation membrane is provided inside the pervaporation membrane chamber 3 , and the pervaporation membrane divides the pervaporation membrane chamber 3 into two chambers, one side is a liquid phase chamber, and the other side is a gas phase chamber.

[0026] Further preferably, the liquid phase chamber discharge port is connected to the top of the raw material tank 1 through a pipeline, and the gas phase chamber discharge port is connected to the condenser 4 through a pipeline.

[0027] Further preferably, the pervaporation membrane is a symmetric membrane, an asymmetric membrane, a composite membrane or others.

[0028] Preferably, the condenser 4 is a shell and tube condenser, a plate condenser, a coil condenser, a spray condenser or others.

[0029] Preferably, the cold gas-liquid separator is a centrifugal gas-liquid separator, a packing gas-liquid separator or a wire mesh gas-liquid separator or others.

[0030] The use method of the utility model is as follows: cyclohexanone wastewater enters the pervaporation membrane chamber 3 from the raw material tank 1 through the raw material pump 2, the pervaporation membrane chamber 3 evaporates and concentrates the wastewater, the liquid phase flows back to the raw material tank 1, the gas phase enters the condenser 4 for condensation and enters the gas-liquid separator 5 for separation, the gas is discharged through the vacuum pump 7, and the liquid enters the product storage tank 6.

[0031] The above are only relatively preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cyclohexanone wastewater organic acid concentration device, comprising a raw material tank (1), characterized in that: The discharge port of the raw material tank (1) is connected to the pervaporation membrane chamber (3) through a pipeline via a raw material pump (2), the pervaporation membrane chamber (3) is connected to the feed port of the condenser (4) through a conveying device, the pervaporation membrane chamber (3) is also connected to the top of the raw material tank (1) through a pipeline, and the discharge port of the condenser (4) is connected to the feed port on the upper part of the gas-liquid separator (5) through an infusion device.

2. The device for concentrating organic acid in cyclohexanone wastewater according to claim 1, characterized in that: The upper side of the raw material tank (1) is provided with a first liquid feed inlet (101), and the top of the raw material tank (1) is provided with a second feed inlet (102).

3. The device for concentrating organic acid in cyclohexanone wastewater according to claim 1, characterized in that: The gas outlet on the gas-liquid separator (5) is connected to the vacuum pump (7) via a pipeline, and the outlet at the bottom of the gas-liquid separator (5) is connected to the feed inlet of the product storage tank (6).

4. The device for concentrating organic acid in cyclohexanone wastewater according to claim 3, characterized in that: The raw material tank (1) is provided with a stirring paddle inside, and the stirring paddle is of a pitched-blade paddle type, a compound folding-blade paddle type, a double folding-blade paddle type or an elliptical-blade paddle type.

5. The device for concentrating organic acid in cyclohexanone wastewater according to claim 1, characterized in that: A pervaporation membrane is arranged inside the pervaporation membrane chamber (3), and the pervaporation membrane divides the pervaporation membrane chamber (3) into two chambers, one side being a liquid phase chamber and the other side being a gas phase chamber.

6. The device for concentrating organic acid in cyclohexanone wastewater according to claim 5, characterized in that: The liquid phase chamber discharge port is connected to the top of the raw material tank (1) through a pipeline, and the gas phase chamber discharge port is connected to the condenser (4) through a pipeline.

7. The device for concentrating organic acid in cyclohexanone wastewater according to claim 5, characterized in that: The pervaporation membrane is a symmetric membrane, an asymmetric membrane or a composite membrane.

8. The device for concentrating organic acid in cyclohexanone wastewater according to claim 1, characterized in that: The condenser (4) is a shell and tube condenser, a plate condenser, a coil condenser or a spray condenser.

9. The device for concentrating organic acid in cyclohexanone wastewater according to claim 1, characterized in that: The gas-liquid separator (5) is a centrifugal gas-liquid separator, a packing gas-liquid separator or a wire mesh gas-liquid separator.

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