Cellulose ether solvent recovery steam stripping system

Abstract

The utility model discloses a cellulose ether solvent recovery stripping system which comprises a stripping tower (5), and a first ethanol sensor (4) is arranged at the middle lower part of the stripping tower (5); the middle of the stripping tower (5) is connected with the second intelligent steam pump (2) through a pipeline, and the top of the stripping tower (5) is connected with the impurity separator (7) through the second ethanol sensor (6). According to the utility model, the ethanol content in the cellulose ether from the middle to the bottom of the stripping tower (5) is timely adjusted and saved through the ethanol sensor, the product quality of the cellulose ether is controlled, and the cyclic utilization of water and ethanol is realized. The device provided by the utility model solves the problems that the existing process is not suitable for large-scale production, the product quality cannot be monitored in time and the production progress cannot be adjusted in time, and has a good application prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of cellulose ether strippers, in particular to a cellulose ether solvent recovery stripping system. Background Art

[0002] Cellulose, a macromolecular polysaccharide composed of glucose, is the primary component of plant cell walls. Cellulose is the most widespread and abundant polysaccharide in nature, accounting for over 50% of the carbon content in plants. In nature, cotton contains nearly 100% cellulose, making it the purest natural source of cellulose. In typical wood, cellulose accounts for 40-50%, with 10-30% hemicellulose and 20-30% lignin.

[0003] Since cellulose is insoluble in water and general organic solvents, its application is subject to many restrictions. Cellulose after etherification is cellulose ether (Cellulose Ether), and its solubility changes significantly, and it can be dissolved in water, dilute acid, dilute alkali or organic solvents. There are many varieties of cellulose ethers with excellent performance. They are widely used in industries such as construction, cement, petroleum, food, textiles, detergents, coatings, medicine, papermaking and electronic components. Cellulose ether needs to go through a cleaning step during production. The cellulose ether after cleaning contains ethanol. After the ethanol is removed through the removal step, if it is directly discharged, it will affect the production environment and cause waste. CN 204162640 U provides a cellulose production steam stripper, but there are still problems that the process is not suitable for large-scale production, and it is impossible to monitor product quality and adjust production progress in time. Utility Model Content

[0004] The utility model provides a cellulose ether solvent recovery and stripping system, which solves the problems that the existing process is not suitable for large-scale production and cannot monitor product quality and adjust production progress in time.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A cellulose ether solvent recovery and stripping system includes a stripping tower, wherein a first ethanol sensor is disposed in the lower middle portion of the stripping tower; the middle portion of the stripping tower is connected to a second intelligent steam pump via a pipeline, and the top portion is connected to an impurity separator via a second ethanol sensor. This preferred embodiment uses the ethanol sensor disposed in the lower middle portion to monitor the ethanol content of the gas within the stripping tower in real time. If the reading is too high, a signal is promptly transmitted to the intelligent steam pump, turning on the steam in the pipeline. After comparison with the ethanol sensor at the top, if the reading returns to normal, a signal is promptly transmitted to the intelligent steam pump, turning off the steam in the pipeline. This avoids manual testing and the lag associated with pump activation. Furthermore, placing the sensor in the middle of the stripping tower allows for timely adjustments to the air intake volume, allowing for timely adjustments to salvage the ethanol content in the cellulose ether already in the middle to bottom portion of the stripping tower, thereby controlling the product quality of the cellulose ether and regulating production progress.

[0007] Furthermore, the stripping tower is connected to the solvent mixer at the top via a pipeline, and to the first intelligent steam pump at the bottom. A cellulose ether outlet pipeline is provided at the bottom. In this preferred embodiment, the stripping tower receives the cellulose ether containing ethanol mixed in the solvent mixer, processes it in the stripping tower to reduce the impurity content in the cellulose ether, and then delivers the cellulose ether to subsequent processing stages via the cellulose ether outlet pipeline provided at the bottom of the stripping tower.

[0008] Furthermore, the steam generator is connected to the second intelligent steam pump, the first intelligent steam pump, and the impurity separator via pipelines. The steam generator is also connected to an external distilled water inlet via pipelines. In this preferred embodiment, the steam generator receives distilled water from the impurity separator as a raw material, as well as external distilled water, achieving efficient utilization of water as a raw material. The steam generator heats the water to generate steam, which is then transported to the stripping tower via the second intelligent steam pump and the first intelligent steam pump.

[0009] Furthermore, an impurity separator is connected to the solvent mixer and is provided with an impurity outlet. In this preferred embodiment, the impurity separator receives steam containing ethanol and impurities from the stripping column, separates the impurities, water, and ethanol based on their different boiling points, discharges the impurities through the impurity outlet, and transports the water and ethanol, respectively, to the steam generator and solvent mixer for recycling, making this suitable for large-scale production.

[0010] Furthermore, the solvent mixer is connected to the inlet of the external raw material cellulose ether through a pipeline. In this preferred embodiment, the solvent mixer receives the external raw material cellulose ether, mixes it with the recycled ethanol, and then inputs it into the stripping column to separate the impurities.

[0011] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0012] (1) The utility model detects the ethanol content of the gas in the stripping tower (5) in real time through an ethanol sensor (1) provided in the middle and lower part of the stripping tower (5). If the data is too high, the signal is promptly transmitted to the intelligent steam pump (2) to open the steam in the pipeline; after comparison with the ethanol sensor (2) at the top, if the data returns to normal, the signal is promptly transmitted to the intelligent steam pump (2) to close the steam in the pipeline. On the one hand, it avoids the hysteresis of manual detection and pump opening. On the other hand, by arranging the sensor in the middle of the stripping tower (5), the air intake can be changed in time, and the ethanol content in the cellulose ether already in the middle to bottom of the stripping tower (5) can be adjusted in time to save the product quality of the cellulose ether and adjust the production progress.

[0013] (2) The stripping tower (5) of the utility model receives the cellulose ether containing ethanol mixed by the solvent mixer (8), processes the cellulose ether by the stripping tower (5), reduces the impurity content in the cellulose ether, and transports the cellulose ether to the subsequent process section through the cellulose ether outlet pipeline provided at the bottom of the stripping tower (5).

[0014] (3) The steam generator (1) of the utility model receives distilled water from the impurity separator (7) as raw material on the one hand, and receives external distilled water as raw material on the other hand, thereby realizing the rational use of water as a material. The steam generator (1) heats water to generate steam, which is then transported to the stripping tower (5) through the second intelligent steam pump (2) and the first intelligent steam pump (3).

[0015] (4) The impurity separator (7) of the utility model receives steam containing ethanol and impurities from the stripping tower (5), separates impurities, water and ethanol by different boiling points, discharges impurities through the impurity outlet, and transports water and ethanol to the steam generator (1) and the solvent mixer (8) respectively for recycling, which is suitable for large-scale production.

[0016] (5) The solvent mixer (8) of the utility model receives external raw material cellulose ether, mixes it with recycled ethanol, and then inputs it into the stripping tower (5) to achieve impurity separation. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] In the figure: 1. steam generator; 2. second intelligent steam pump; 3. first intelligent steam pump; 4. first ethanol sensor; 5. stripping tower; 6. second ethanol sensor; 7. impurity separator; 8. solvent mixer. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the technical solution of the present application will be described in detail below in conjunction with specific embodiments. It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs.

[0020] Refer to the attached Figure 1 As shown, an embodiment of the present invention provides a cellulose ether solvent recovery and stripping system, comprising a stripping tower 5, with a first ethanol sensor 4 located in the lower middle portion of the stripping tower 5. The middle portion of the stripping tower 5 is connected to a second intelligent steam pump 2 via a pipeline, and the top portion is connected to an impurity separator 7 via a second ethanol sensor 6. The ethanol sensor used in this utility model is a ME2-C2H5OH-Ф16 sensor manufactured by Zhengzhou Weisheng Electronic Technology Co., Ltd., and the intelligent steam pump used in this utility model is a DY-D hydraulic diaphragm metering pump manufactured by Shanghai Sunshine Pump Manufacturing Co., Ltd. The top portion of the stripping tower 5 is connected to a solvent mixer 8 via a pipeline, and the bottom portion is connected to the first intelligent steam pump 3. A cellulose ether outlet pipeline is located at the bottom portion. A steam generator 1 is connected to the second intelligent steam pump 2, the first intelligent steam pump 3, and the impurity separator 7 via pipelines. The steam generator 1 is connected to an external distilled water inlet via a pipeline. The impurity separator 7 is connected to the solvent mixer 8, which is provided with an impurity outlet. The solvent mixer 8 is connected to an external cellulose ether raw material inlet via a pipeline.

[0021] During operation, the present invention uses an ethanol sensor 1, located in the lower middle portion of the stripping tower 5, to monitor the ethanol content of the gas within the stripping tower 5 in real time. If the reading is too high, a signal is promptly transmitted to the intelligent steam pump 2, turning on the steam supply in the pipeline. After comparison with the ethanol sensor 2 at the top, if the reading returns to normal, a signal is promptly transmitted to the intelligent steam pump 2, turning off the steam supply in the pipeline. This avoids manual monitoring and the lag associated with pump operation. Furthermore, placing the sensor in the middle of the stripping tower 5 allows for timely adjustment of the air intake volume, allowing for timely adjustments to salvage the ethanol content in the cellulose ether already in the middle to bottom portions of the stripping tower 5, thereby controlling product quality and regulating production progress. The stripping tower 5 receives cellulose ether containing ethanol, mixed in the solvent mixer 8. This cellulose ether is then processed in the stripping tower 5 to reduce its impurity content, and then transported to subsequent processing stages via a cellulose ether outlet pipeline located at the bottom of the stripping tower 5. The steam generator 1 receives distilled water from the impurity separator 7 as its raw material, as well as external distilled water, ensuring efficient utilization of water as a raw material. Steam generator 1 heats water to generate steam, which is then transported to stripping tower 5 via second and first intelligent steam pumps 2 and 3. Impurity separator 7 receives steam containing ethanol and impurities from stripping tower 5, separates the impurities, water, and ethanol based on their different boiling points, and discharges the impurities through an impurity outlet. Water and ethanol are then transported to steam generator 1 and solvent mixer 8, respectively, for recycling, making this process suitable for large-scale production. Solvent mixer 8 receives external raw material cellulose ether, mixes it with recycled ethanol, and then feeds it to stripping tower 5 for impurity separation.

[0022] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A cellulose ether solvent recovery and stripping system, characterized in that: The invention comprises a stripping tower (5), wherein a first ethanol sensor (4) is arranged at the middle and lower part of the stripping tower (5); the middle part of the stripping tower (5) is connected to a second intelligent steam pump (2) through a pipeline, and the top part is connected to an impurity separator (7) through a second ethanol sensor (6); the top part of the stripping tower (5) is connected to a solvent mixer (8) through a pipeline, and the bottom part is connected to the first intelligent steam pump (3), and a cellulose ether outlet pipeline is arranged at the bottom part; a steam generator (1) is connected to the second intelligent steam pump (2), the first intelligent steam pump (3) and the impurity separator (7) through a pipeline, and the steam generator (1) is connected to an external distilled water inlet through a pipeline; the impurity separator (7) is connected to the solvent mixer (8), and the impurity separator (7) is provided with an impurity outlet; and the solvent mixer (8) is connected to an external raw material cellulose ether inlet through a pipeline.

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