CN213131978U - Recovery system for recovering isobutanol in alcohol low-boiling-point substance by isobutyl ester plasticizer - Google Patents
Recovery system for recovering isobutanol in alcohol low-boiling-point substance by isobutyl ester plasticizer Download PDFInfo
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- CN213131978U CN213131978U CN202021396408.2U CN202021396408U CN213131978U CN 213131978 U CN213131978 U CN 213131978U CN 202021396408 U CN202021396408 U CN 202021396408U CN 213131978 U CN213131978 U CN 213131978U
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Abstract
The utility model discloses a recovery system of isobutanol in isobutanol plasticizer recovery alcohol low-boiling-point substances, which comprises a storage tank for recovering the alcohol low-boiling-point substances, a rectifying still, a rectifying tower, a tower top condenser, a glass viewing cylinder, an impurity storage tank and a recovery alcohol storage tank, wherein the impurity storage tank and the recovery alcohol storage tank are respectively connected with the glass viewing cylinder; a feed inlet of the rectifying still is connected with a storage tank for low-boiling-point substances of the recovered alcohol; an azeotrope inlet of the rectifying tower is connected with an azeotrope outlet of the rectifying kettle, an isobutanol reflux outlet of the rectifying tower is connected with an isobutanol reflux inlet of the rectifying kettle, and an impurity outlet of the rectifying tower is connected with an impurity inlet of the tower top condenser; the condensate inlet of the glass viewing cylinder is connected with the tower top condenser, the impurity reflux outlet is connected with the top of the rectifying tower, and the bottom of the glass viewing cylinder is respectively connected with the impurity storage tank and the recovered alcohol storage tank. The utility model discloses make impurity, isobutanol and water in the low-boiling-point thing of recovery alcohol form the many units azeotropy in rectifying still to retrieve isobutanol through the rectifying column, improved in the isobutyl esters plasticizer production process utilization ratio of raw materials.
Description
Technical Field
The utility model belongs to the technical field of plasticizer production system technique and specifically relates to a recovery system of isobutanol in low boiling-point substance of isobutyl ester class plasticizer recovery alcohol is related to.
Background
The plasticizer is added to increase the plasticity and fluidity of the finished product and make the finished product flexible when processing high polymers such as rubber, plastic, paint and the like, and is an essential additive in the plastic industry. The annual capacity of plasticizers in China reaches 2800kt, and the plasticizer has become the first major producing and consuming countries in the world and continues to show growing momentum.
The isobutyl ester plasticizer is mainly produced by esterification reaction of isobutyl alcohol and anhydride, most of manufacturers in China currently adopt a method for recycling alcohol, fresh alcohol and recycled alcohol are put into an esterification reaction kettle for reaction, the fresh alcohol is supplemented in the reaction process, and reflux reaction is carried out to a certain degree so as to improve the reaction efficiency and reduce the frequency of throwing out waste alcohol. For example, in the Chinese patent literature, "a method for improving the quality of a plasticizer product" is disclosed, wherein the publication No. CN102952012A is that raw material alcohol is composed of 75-85% of fresh alcohol and 15-25% of recovered alcohol (containing 30-50% of light-boiling substances), acid or acid anhydride, fresh alcohol and a catalyst are firstly put into an esterification reaction kettle, when the temperature in the esterification kettle reaches 130-135 ℃, the recovered alcohol preheated to 100-105 ℃ is sprayed in a atomized manner from the top of an esterification tower in batches, the light-boiling substances are removed, the possibility of unsaturated light-boiling substances participating in the reaction is reduced, and the color of the reaction product ester is reduced.
However, as the catalyst adopted in the production process of the isobutyl ester plasticizer is mostly high-purity acid, more side reactions can be generated in the esterification reaction, and more impurities influencing the esterification color are generated. After the isobutanol is recycled for a long time, the content of impurities is more and more, so that the color of the esterification reaction and the quality of products are influenced, and therefore, the recovered alcohol needs to be treated. The recovered alcohol generates more than 20 percent of low-boiling-point substances after treatment, the content of isobutanol in the recovered alcohol low-boiling-point substances is about 70 percent by weight, the content of impurities such as isobutyl ether, aldehyde, ketone and the like is about 15 percent by weight, and the sulfur test color number is dark reddish brown. In the prior art, generally, the low-boiling-point substances of the recovered alcohol are treated as waste products, so that great waste is caused, the utilization rate of raw materials is low, and the production cost is increased.
Disclosure of Invention
The utility model aims to overcome the defects that in the prior art, the recovered alcohol low-boiling-point substance obtained after the recovered alcohol is treated is generally treated as a waste product for treatment during the production of isobutyl ester plasticizers, but the recovered alcohol low-boiling-point substance contains more isobutanol, which causes great waste and low utilization rate of raw materials; the recovery system of isobutyl ester plasticizer for recovering isobutanol in alcohol low-boiling-point substances is provided, and the isobutanol in the recovered alcohol low-boiling-point substances is recycled, so that the utilization rate of the isobutanol is greatly improved, the generation amount of the recovered alcohol low-boiling-point substances is reduced, and the production cost is saved; a large amount of impurities which influence the esterification color and luster in the recovered alcohol low-boiling-point substance are separated, and the product quality is ensured.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a recovery system for recovering isobutanol in an alcohol low-boiling-point substance by using an isobutanol plasticizer comprises a recovered alcohol low-boiling-point substance storage tank, a rectifying still, a rectifying tower, a tower top condenser, a glass viewing cylinder, an impurity storage tank and a recovered alcohol storage tank, wherein the recovered alcohol low-boiling-point substance storage tank, the rectifying still, the rectifying tower, the tower top condenser and the glass viewing cylinder are sequentially connected through a pipeline; the top of the rectifying still is respectively provided with a feed inlet, a water inlet and an azeotrope outlet, the bottom of the rectifying still is provided with an isobutanol reflux inlet, and the feed inlet is connected with a low-boiling-point substance storage tank for recovering alcohol; the bottom of the rectifying tower is respectively provided with an azeotrope inlet and an isobutanol reflux outlet, the top of the rectifying tower is respectively provided with an impurity outlet and an impurity reflux inlet, the azeotrope inlet at the bottom of the rectifying tower is connected with the azeotrope outlet at the top of the rectifying still, and the isobutanol reflux outlet at the bottom of the rectifying tower is connected with the isobutanol reflux inlet at the bottom of the rectifying still; the top of the tower top condenser is respectively provided with an impurity inlet and a cooling water outlet, the bottom of the tower top condenser is respectively provided with a condensate outlet and a cooling water inlet, and the impurity outlet at the top of the rectifying tower is connected with the impurity inlet of the tower top condenser; the top of the glass viewing cylinder is respectively provided with a condensate inlet and an impurity backflow outlet, the bottom of the glass viewing cylinder is provided with a separator outlet, the condensate inlet at the top of the glass viewing cylinder is connected with a condensate outlet of a tower top condenser, the impurity backflow outlet at the top of the glass viewing cylinder is connected with an impurity backflow inlet at the top of the rectifying tower, and the separator outlet at the bottom of the glass viewing cylinder is respectively connected with an impurity storage tank and a recovered alcohol storage tank.
The utility model discloses the recovery alcohol low boiling thing that produces after handling recovery alcohol in the isobutyl ester class plasticizer production process is adopted to recovery alcohol low boiling thing storage tank, then get into in the rectifying still, and add water through the water inlet of rectifying still, impurity in the recovery alcohol low boiling thing, isobutanol and the water of adding can form the polycoazeotropy, the polycoazeotropy gets into the rectifying tower and rectifies, the binary azeotrope of impurity and water and the binary azeotrope of isobutanol and water are evaporated from the top of the tower in proper order in the rectifying tower, pure isobutanol that leaves in the tower flows out through the isobutanol backward flow export at the bottom of the tower, get into in the rectifying still, thereby obtain the pure isobutanol after retrieving in the rectifying still; impurities, water and a small amount of isobutanol which are evaporated from the top of the tower enter a condenser at the top of the tower for condensation, the impurities and the water which are firstly extracted enter an impurity storage tank in the condensation process, a water phase can be separated from an organic phase after standing, the separated water phase can be added into a rectifying still again for recycling, and the organic phase is treated as waste; the state of condensate can be observed through the glass viewing cylinder in the condensation process, and when the condensate in the glass viewing cylinder is homogeneous, isobutanol can be extracted and enters a recovery alcohol storage tank; the isobutanol obtained in the recovered alcohol storage tank and the isobutanol recovered in the rectifying still can be used as raw materials for the production process of the isobutyl ester plasticizer again, so that the raw materials are greatly saved, and the production cost is reduced.
The system in the utility model has simple structure and easy operation, the purity of the recovered isobutanol can reach more than 99 percent, the sulfur color testing number is lower than # 15, the raw material standard of the production of the isobutyl ester plasticizer is reached, the isobutyl ester plasticizer can participate in the production process again, the utilization rate of the isobutanol is greatly improved, the production amount of the recovered alcohol low-boiling-point substances is reduced, and the production cost is saved; meanwhile, a large amount of impurities which influence the esterification color of the isobutyl ester plasticizer in the recovered alcohol low-boiling-point substances can be effectively separated, so that the color of the esterification reaction is ensured, and the quality of the isobutyl ester plasticizer product is ensured.
Preferably, control valves are respectively arranged at an outlet of the recovered alcohol low-boiling-point substance storage tank, a feed inlet of the rectifying still, a water inlet and an isobutanol reflux inlet, and at inlets of the impurity storage tank and the recovered alcohol storage tank. The material in each device can be controlled to enter and exit through the opening and closing of the control valve, so that the orderly operation of the whole recovery system is ensured.
Preferably, the recovered alcohol low-boiling residue storage tank, the rectifying still, the impurity storage tank and the recovered alcohol storage tank are respectively provided with a liquid level sensor. The liquid level condition in each device can be read through the liquid level sensor, thereby controlling the normal operation of the system.
Preferably, a feed pump is arranged on a pipeline for connecting the recovered alcohol low-boiling residue storage tank with the feed inlet of the rectifying still, and control valves are respectively arranged in front of and behind the feed pump. The low-boiling-point substance of the recovered alcohol can be uniformly added into the rectifying still for reaction through the feeding pump, so that the adding amount of the material is ensured.
Preferably, a steam heater arranged along the inner wall of the rectifying kettle is arranged in the rectifying kettle, and a steam inlet connected with the air inlet pipeline and a condensate outlet connected with the water outlet pipeline are respectively arranged on the steam heater. The material in the rectifying still is heated by the steam heater to realize multi-component azeotropy of impurities, isobutanol and water, the heating is uniform, the temperature is easy to control, and the recovery effect of isobutanol can be ensured.
Preferably, the rectifying still is provided with a pressure sensor and a first temperature sensor. The pressure and the temperature of the gas in the rectifying still are read by the pressure sensor and the first temperature sensor so as to better control the reaction.
Preferably, a temperature indicator is arranged at the top of the rectifying tower. The temperature in the rectifying tower is read by the temperature indicator, so that the rectifying temperature is convenient to control, the full separation of materials is ensured, and the purity of the recovered isobutanol is improved.
Preferably, a second temperature sensor is arranged on a connecting pipeline between a condensate outlet of the tower top condenser and a condensate inlet of the glass viewing cylinder, a condensation control valve is arranged on a pipeline at a cooling water outlet of the tower top condenser, and the second temperature sensor is connected with the condensation control valve in a control mode. The temperature of condensate is read through the second temperature sensor, and the using amount of the condensate water is controlled through the opening degree of the temperature control valve, so that the condensation effect is guaranteed.
Therefore, the utility model has the advantages that: the recovered alcohol low-boiling-point substance generated in the production process of the isobutyl ester plasticizer forms multi-component azeotropy with water in the rectifying still, and then the multi-component azeotropy is rectified by the rectifying tower, so that the isobutanol is separated from impurities in the recovered alcohol low-boiling-point substance, the recovery of the isobutanol is realized, the utilization rate of the isobutanol is greatly improved, the generation amount of the recovered alcohol low-boiling-point substance is reduced, and the production cost is saved; and meanwhile, impurities in the recovered alcohol low-boiling-point substance can be effectively separated, so that the color of the esterification reaction is ensured, and the quality of isobutyl ester plasticizer products is ensured.
Drawings
Fig. 1 is a schematic view of a connection structure of the present invention.
In the figure: 1 a storage tank for recovering alcohol low-boiling-point substances, 2a rectifying still, 201 feed inlets, 202 water inlets, 203 azeotrope outlets, 204 isobutanol reflux inlets, 3 a rectifying tower, 301 azeotrope inlets, 302 isobutanol reflux outlets, 303 impurity outlets, 304 impurity reflux inlets, 4 tower top condensers, 401 impurity inlets, 402 cooling water outlets, 403 condensate outlets, 404 cooling water inlets and 5 glass viewing cylinders, 501 condensate inlet, 502 impurity reflux outlet, 503 isolate outlet, 6 impurity storage tank, 7 recycle alcohol storage tank, 8 control valve, 9 liquid level sensor, 10 feed pump, 11 steam heater, 1101 steam inlet, 1102 condensate outlet, 12 pressure sensor, 13 first temperature sensor, 14 temperature indicator, 15 second temperature sensor, 16 condensation control valve.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
Example (b):
as shown in fig. 1, a recovery system for recovering isobutanol from an alcohol low-boiling residue by using an isobutanol plasticizer comprises a recovered alcohol low-boiling residue storage tank 1, a rectifying still 2, a rectifying tower 3, a tower top condenser 4, a glass viewing cylinder 5, an impurity storage tank 6 and a recovered alcohol storage tank 7 which are sequentially connected with each other through pipelines, wherein the recovered alcohol low-boiling residue storage tank 1, the rectifying still 2, the rectifying tower 3, the tower top condenser 4 and the glass viewing cylinder 5 are connected with each other through pipelines.
The top of the rectifying still is provided with a feed inlet 201, a water inlet 202 and an azeotrope outlet 203 respectively, the bottom of the rectifying still is provided with an isobutanol reflux inlet 204, the feed inlet is connected with a recovered alcohol low-boiling-point substance storage tank, a feed pump 10 is arranged on a pipeline connecting the recovered alcohol low-boiling-point substance storage tank and the feed inlet of the rectifying still, and a control valve 8 is arranged in front of the feed pump and behind the feed pump respectively. The rectifying still is internally provided with a steam heater 11 arranged along the inner wall of the rectifying still, the steam heater is respectively provided with a steam inlet 1101 connected with an air inlet pipeline and a cooling water outlet 1102 connected with a water outlet pipeline, the rectifying still is provided with a pressure sensor 12 close to the steam inlet, and a first temperature sensor 13 close to the cooling water outlet.
The bottom of the rectifying tower is provided with an azeotrope inlet 301 and an isobutanol reflux outlet 302 respectively, the top of the rectifying tower is provided with an impurity outlet 303 and an impurity reflux inlet 304 respectively, the azeotrope inlet at the bottom of the rectifying tower is connected with the azeotrope outlet at the top of the rectifying kettle, the isobutanol reflux outlet at the bottom of the rectifying tower is connected with the isobutanol reflux inlet at the bottom of the rectifying kettle, and the top of the rectifying tower is provided with a temperature indicator 14.
The top of the tower top condenser is respectively provided with an impurity inlet 401 and a cooling water outlet 402, the bottom of the tower top condenser is respectively provided with a condensate outlet 403 and a cooling water inlet 404, and the impurity outlet at the top of the rectifying tower is connected with the impurity inlet of the tower top condenser.
The top of the glass viewing cylinder is respectively provided with a condensate inlet 501 and an impurity backflow outlet 502, the bottom of the glass viewing cylinder is provided with a separator outlet 503, the condensate inlet at the top of the glass viewing cylinder is connected with the condensate outlet of the condenser at the top of the tower, the impurity backflow outlet at the top of the glass viewing cylinder is connected with the impurity backflow inlet at the top of the rectifying tower, and the separator outlet at the bottom of the glass viewing cylinder is respectively connected with an impurity storage tank and a recovered alcohol storage tank. And a second temperature sensor 15 is arranged on a connecting pipeline between a condensate outlet of the tower top condenser and a condensate inlet of the glass viewing cylinder, a condensation control valve 16 is arranged on a pipeline at a cooling water outlet of the tower top condenser, and the second temperature sensor is connected with the condensation control valve in a control manner.
The outlet of the recovered alcohol low-boiling-point substance storage tank, the feed inlet of the rectifying still, the water inlet and the isobutanol backflow inlet, the inlet of the impurity storage tank and the inlet of the recovered alcohol storage tank are respectively provided with a control valve 8, and the recovered alcohol low-boiling-point substance storage tank, the rectifying still, the impurity storage tank and the recovered alcohol storage tank are respectively provided with a liquid level sensor 9.
When the system in the utility model is used for recovering isobutanol in the low-boiling-point substance of isobutanol plasticizer recovery alcohol, the operation method is as follows:
(1) when the quality of the recovered alcohol in the isobutyl ester plasticizer production process is poor, sending the recovered alcohol to a treatment system for treatment, and collecting the recovered alcohol low-boiling-point substance obtained by treatment to a recovered alcohol low-boiling-point substance storage tank in the system;
(2) opening a feed pump, and feeding the recovered alcohol low-boiling-point substance to a 70% liquid level of the rectifying still from a feed port; adding water into the rectifying kettle from a water inlet according to the volume ratio of the low-boiling-point substances to the water being 5-7: 1;
(3) controlling the tower top temperature of the rectifying tower to be 83.6 ℃ by a steam heating device of the rectifying kettle;
(4) opening a control valve on the impurity storage tank, and extracting and recovering impurities separated from the low-boiling-point alcohol to the impurity storage tank; in the impurity extraction process, the temperature at the top of the rectifying tower gradually rises, and the materials in the glass viewing cylinder are gradually clear;
(5) in the impurity extraction process, when the temperature of the top of the rectifying tower reaches 108 ℃, and the materials in the glass viewing cylinder are in a homogeneous phase, closing a control valve on an impurity storage tank, opening a control valve on a recovered alcohol storage tank, controlling the reflux ratio to be 2-3, and extracting the recovered isobutanol to the recovered alcohol storage tank;
(6) the recovered isobutanol obtained in the recovered alcohol storage tank and the rectifying still returns to the isobutyl ester plasticizer production system to be used as a raw material; the water phase in the impurity storage tank replaces water and is added into the rectifying still for recycling, and the organic phase is treated according to the three-waste treatment program.
The utility model adopts the recovered alcohol low-boiling-point substance generated after the recovered alcohol is processed in the isobutyl ester plasticizer production process to the recovered alcohol low-boiling-point substance storage tank, then enters the rectifying still, and water is added through the water inlet of the rectifying still, the impurities, the isobutyl alcohol and the added water in the recovered alcohol low-boiling-point substance can form multi-component azeotropy, and the multi-component azeotropy enters the rectifying tower from the azeotrope inlet at the bottom of the rectifying tower for rectification; in the rectifying tower, the binary azeotrope of impurity and water and the binary azeotrope of isobutanol and water are successively distilled out from an impurity outlet at the top of the tower, and pure isobutanol left in the tower flows out through an isobutanol reflux outlet at the bottom of the tower and enters a rectifying kettle, so that the recovered pure isobutanol is obtained in the rectifying kettle; impurities, water and a small amount of isobutanol which are evaporated from the top of the tower enter a tower top condenser from an impurity inlet, pass through the tower top condenser from top to bottom, exchange heat with cooling water which passes through the tower top condenser from bottom to top for condensation, the impurities and the water which are extracted firstly enter an impurity storage tank in the condensation process, a water phase can be separated from an organic phase after standing, the separated water phase can be added into a rectifying still again for recycling, and the organic phase is treated as waste; the state of condensate can be observed through the glass viewing cylinder in the condensation process, and when the condensate in the glass viewing cylinder is homogeneous, isobutanol can be extracted and enters a recovery alcohol storage tank; the isobutanol obtained in the recovered alcohol storage tank and the isobutanol recovered in the rectifying still can be used as raw materials for the production process of the isobutyl ester plasticizer again, so that the raw materials are greatly saved, and the production cost is reduced.
The system in the utility model has simple structure and easy operation, the purity of the recovered isobutanol can reach more than 99 percent, the sulfur color testing number is lower than # 15, the raw material standard of the production of the isobutyl ester plasticizer is reached, the isobutyl ester plasticizer can participate in the production process again, the utilization rate of the isobutanol is greatly improved, the production amount of the recovered alcohol low-boiling-point substances is reduced, and the production cost is saved; meanwhile, a large amount of impurities which influence the esterification color of the isobutyl ester plasticizer in the recovered alcohol low-boiling-point substances can be effectively separated, so that the color of the esterification reaction is ensured, and the quality of the isobutyl ester plasticizer product is ensured.
Claims (8)
1. A recovery system for recovering isobutanol in alcohol low-boiling-point substances by using isobutanol plasticizers is characterized by comprising a storage tank (1) for recovering the alcohol low-boiling-point substances, a rectifying still (2), a rectifying tower (3), a tower top condenser (4), a glass viewing cylinder (5), an impurity storage tank (6) and a storage tank (7) for recovering the alcohol, wherein the storage tank (1), the rectifying still (2), the rectifying tower (3), the tower top condenser (4) and the glass viewing cylinder are sequentially connected through pipelines; the top of the rectifying still is respectively provided with a feed inlet (201), a water inlet (202) and an azeotrope outlet (203), the bottom of the rectifying still is provided with an isobutanol reflux inlet (204), and the feed inlet is connected with a low-boiling-point substance storage tank for recovered alcohol; an azeotrope inlet (301) and an isobutanol reflux outlet (302) are respectively arranged at the bottom of the rectifying tower, an impurity outlet (303) and an impurity reflux inlet (304) are respectively arranged at the top of the rectifying tower, the azeotrope inlet at the bottom of the rectifying tower is connected with the azeotrope outlet at the top of the rectifying kettle, and the isobutanol reflux outlet at the bottom of the rectifying tower is connected with the isobutanol reflux inlet at the bottom of the rectifying kettle; the top of the tower top condenser is respectively provided with an impurity inlet (401) and a cooling water outlet (402), the bottom of the tower top condenser is respectively provided with a condensate outlet (403) and a cooling water inlet (404), and the impurity outlet at the top of the rectifying tower is connected with the impurity inlet of the tower top condenser; the top of the glass viewing cylinder is respectively provided with a condensate inlet (501) and an impurity backflow outlet (502), the bottom of the glass viewing cylinder is provided with a separator outlet (503), the condensate inlet at the top of the glass viewing cylinder is connected with the condensate outlet of the tower top condenser, the impurity backflow outlet at the top of the glass viewing cylinder is connected with the impurity backflow inlet at the top of the rectifying tower, and the separator outlet at the bottom of the glass viewing cylinder is respectively connected with an impurity storage tank and a recovered alcohol storage tank.
2. The system for recovering the isobutanol in the isobutanol-based plasticizer recovered alcohol low-boiling-point substance according to claim 1, wherein a control valve (8) is respectively arranged at an outlet of the alcohol low-boiling-point substance recovery storage tank, a feed inlet of the rectifying still, a water inlet and an isobutanol reflux inlet, and at inlets of the impurity storage tank and the alcohol recovery storage tank.
3. The recovery system of isobutanol in isobutanol-based plasticizer recovered alcohol low-boiling-point substances according to claim 1 or 2, wherein the recovered alcohol low-boiling-point substance storage tank, the rectifying still, the impurity storage tank and the recovered alcohol storage tank are respectively provided with a liquid level sensor (9).
4. The recovery system of isobutanol in isobutanol-based ester plasticizer recovered alcohol low-boiling-point substances according to claim 1, wherein a feed pump (10) is arranged on a pipeline connecting the recovered alcohol low-boiling-point substance storage tank and the feed inlet of the rectifying still, and control valves are respectively arranged before and after the feed pump.
5. The recovery system of isobutanol in isobutanol ester plasticizers recovered alcohol low-boiling-point substances according to claim 1, wherein a steam heater (11) is arranged in the rectifying still and along the inner wall of the rectifying still, and a steam inlet (1101) connected with an air inlet pipeline and a condensate outlet (1102) connected with a water outlet pipeline are respectively arranged on the steam heater.
6. The system for recovering isobutanol from an alcohol low-boiling-point substance by using the isobutanol ester plasticizer according to claim 5, wherein a pressure sensor (12) and a first temperature sensor (13) are arranged on the rectifying still.
7. The system for recovering isobutanol from an alcohol low-boiling substance by using the isobutanol ester plasticizer according to claim 1, wherein a temperature indicator (14) is arranged at the top of the rectifying tower.
8. The recovery system of isobutanol in isobutanol-based plasticizer recovered alcohol low-boiling substances according to claim 1, wherein a second temperature sensor (15) is arranged on a connecting pipeline between a condensate outlet of the tower top condenser and a condensate inlet of the glass viewing cylinder, a condensation control valve (16) is arranged on a pipeline at a cooling water outlet of the tower top condenser, and the second temperature sensor is connected with the condensation control valve in a control mode.
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| CN115232007A (en) * | 2022-06-16 | 2022-10-25 | 浙江建业化工股份有限公司 | Production method of plasticizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115232007A (en) * | 2022-06-16 | 2022-10-25 | 浙江建业化工股份有限公司 | Production method of plasticizer |
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