CN114262431B - Water-saving and consumption-reducing method in polycarbonate production process - Google Patents
Water-saving and consumption-reducing method in polycarbonate production process Download PDFInfo
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- CN114262431B CN114262431B CN202111432495.1A CN202111432495A CN114262431B CN 114262431 B CN114262431 B CN 114262431B CN 202111432495 A CN202111432495 A CN 202111432495A CN 114262431 B CN114262431 B CN 114262431B
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Abstract
The invention belongs to the technical field of resource recycling, and relates to a method for saving water and reducing consumption in the polycarbonate production process, which comprises the steps of providing steam condensate water, detecting the conductivity of the steam condensate water, preparing bisphenol A sodium salt solution by using the steam condensate water with the conductivity less than 90 mu s/cm to replace desalted water, and producing polycarbonate by using the prepared bisphenol A sodium salt solution; the steam condensate water is condensate water of an MVR system in the polycarbonate production process. The invention not only can save the usage amount of desalted water, but also can reduce the energy consumption and save the production cost.
Description
Technical Field
The invention belongs to the technical field of resource recycling, and relates to a method for saving water and reducing consumption in a polycarbonate production process.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
When bisphenol A sodium salt and phosgene are subjected to interfacial polycondensation to prepare polycarbonate resin (PC), the yellow index of the prepared bisphenol A sodium salt solution is increased due to salt and oxygen, so that the yellow index of prepared PC particles is increased, the quality of PC products is affected, and the preparation of the bisphenol A sodium salt solution after deoxidization by desalted water is needed. However, the inventor found that a large amount of desalted water is consumed for preparing bisphenol A sodium salt solution through actual production, and the energy consumption and cost for using the desalted water are high.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a water-saving and consumption-reducing method in the polycarbonate production process, which not only can save the usage amount of desalted water, but also can reduce the energy consumption and save the production cost.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
on the one hand, the method for saving water and reducing consumption in the polycarbonate production process comprises the steps of providing steam condensate water, detecting the conductivity of the steam condensate water, preparing bisphenol A sodium salt solution by using the steam condensate water with the conductivity less than 90 mu s/cm instead of desalted water, and producing polycarbonate by using the prepared bisphenol A sodium salt solution; the steam condensate water is condensate water of an MVR system in the polycarbonate production process.
In the early process development process, desalted water is adopted in the polycarbonate production process, and the desalted water needs not to be higher than 50 mu s/cm to meet the quality requirement of the polycarbonate product. In order to save production cost, a substitute for desalted water needs to be found.
The production process of the polycarbonate comprises reaction synthesis, washing separation, devolatilization drying, extrusion granulation, wastewater treatment and the like; wherein, wastewater treatment needs to pretreat wastewater, then evaporating and concentrating the wastewater by an MVR system, and then carrying out subsequent treatment on concentrated solution. The vapor condensate produced by the MVR system is condensed water of evaporated vapor, and has lower impurity content than other water (excluding desalted water), and has potential as desalted water. However, since the MVR system is used for treating wastewater, a small amount of salt is easily carried by water vapor during evaporation, and the water vapor is condensed to enter the steam condensate, the salt content of the steam condensate generated by the MVR system is higher than that of desalted water. Through long-term actual detection, the conductivity of the steam condensate water generated by the MVR system is unstable, and the conductivity of the steam condensate water intermittently fluctuates between 60 and 100 mu s/cm, for example, the conductivity of the steam condensate water is about 65 mu s/cm in a certain period of time, and the conductivity of the steam condensate water is about 75 mu s/cm in another period of time. In order to meet the process requirements for desalinated water, further desalination of the steam condensate is generally required.
Further research shows that the steam condensate has higher energy consumption for further desalination, and therefore other modes are needed to be adopted for treatment, or another desalted water substitute is provided, and the inventor has found through long-term experiments that the effect on the configuration of bisphenol A sodium salt is little when the conductivity of the steam condensate is higher than 50 mu s/cm. However, long-term finding shows that not all steam condensate water with conductivity can meet the configuration effect of bisphenol A sodium salt, and when the conductivity of the steam condensate water is higher than 90 mu s/cm, the yellow index of bisphenol A sodium salt solution is increased, so that the yellow index of PC particles is increased, and the product quality of PC is further affected. Therefore, the invention selects the steam condensate water with the conductivity less than 90 mu s/cm to replace desalted water to prepare bisphenol A sodium salt solution, and can greatly reduce the consumption of desalted water on the premise of ensuring the product quality of PC, thereby reducing the production cost.
In another aspect, a system for producing polycarbonate, comprises:
the bisphenol A sodium salt solution preparing unit is used for preparing bisphenol A sodium salt solution;
a polycarbonate synthesis unit for reacting bisphenol a sodium salt solution with phosgene to produce polycarbonate;
the purification unit is used for purifying the product materials output by the polycarbonate synthesis unit;
the wastewater treatment unit comprises a pretreatment device and an MVR system, and wastewater generated by the purification unit is subjected to pretreatment, evaporation and concentration sequentially through the pretreatment device and the MVR system;
the steam condensate water pipeline of the MVR system is provided with an electric conductivity on-line detection device and a configuration valve, and is connected with a bisphenol A sodium salt solution configuration unit, so that the steam condensate water is used for the configuration of bisphenol A sodium salt solution.
In a third aspect, a process for producing a polycarbonate, providing a production system for the polycarbonate; according to the detection result of the conductivity online detection device, conveying the steam condensate water with the conductivity smaller than 90 mu s/cm to a bisphenol A sodium salt solution configuration unit to configure bisphenol A sodium salt solution; stopping conveying the steam condensate when the conductivity of the steam condensate is not less than 90 mu s/cm, and preparing bisphenol A sodium salt solution by desalted water; the prepared bisphenol A sodium salt solution and phosgene are utilized for producing polycarbonate.
Because the conductivity of desalted water is generally lower than that of steam condensate water, when the conductivity of the steam condensate water is higher than 90 mu s/cm, the desalted water can be selected to be mixed with the steam condensate water, however, for the improvement of a mature process or the development of a new process, the occupation of a system or a process needs to be considered, a buffer tank needs to be added for regulating the conductivity of the steam condensate water by using the desalted water, a system device is added, the power of the desalted water and the steam condensate water is consumed, the energy consumption is increased, and the production cost is not reduced; when the conductivity of the steam condensate water is not less than 90 mu s/cm, preparing bisphenol A sodium salt solution by desalted water, and when the conductivity of the steam condensate water is reduced to 90 mu s/cm, preparing bisphenol A sodium salt solution by the steam condensate water again. The production cost of enterprises can be greatly reduced.
The beneficial effects of the invention are as follows:
the invention adopts the steam condensate water with the conductivity less than 90 mu s/cm to replace desalted water to prepare bisphenol A sodium salt solution, thereby greatly reducing the consumption of desalted water and realizing the purposes of water saving and consumption reduction. Meanwhile, the invention improves the utilization rate of the steam condensate water, realizes the recycling utilization of the steam condensate water, and further reduces the production cost. After actual production implementation, the invention can save 208 ten thousand tons of desalted water each year and save 2080 ten thousand yuan each year.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a bisphenol A sodium salt solution configuration unit in an embodiment of the present invention;
wherein, 1, a steam condensate tank, 2, a steam condensate pump, 3, a steam condensate inlet heat exchanger valve, 4, a circulating water inlet valve, 5, a steam condensate heat exchanger, 6, a circulating water return valve, 7, a steam condensate regulating valve, 8, a steam condensate pipeline check valve, 9, a desalination water tank, 10, a desalination water pump, 11, a deoxidization tower, 12, a deoxidization water tank, 13, a deoxidization water pump, 14, a deoxidization water regulating valve, 15, a deoxidization water pipeline check valve, 16, 32% caustic soda regulating valve, 17 and a bisphenol A sodium salt prefabricated tank.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In view of the problem of large desalted water consumption in the existing polycarbonate production process, the invention provides a water-saving and consumption-reducing method in the polycarbonate production process.
The invention provides a water-saving and consumption-reducing method in the polycarbonate production process, which comprises the steps of providing steam condensate, detecting the conductivity of the steam condensate, preparing bisphenol A sodium salt solution by using the steam condensate with the conductivity of less than 90 mu s/cm instead of desalted water, and producing polycarbonate by using the prepared bisphenol A sodium salt solution; the steam condensate water is condensate water of an MVR system in the polycarbonate production process.
According to the invention, the bisphenol A sodium salt solution is prepared by replacing desalted water with steam condensate water with the conductivity less than 90 mu s/cm, so that the consumption of desalted water can be greatly reduced on the premise of ensuring the product quality of PC, and the production cost is reduced.
In addition, taking the actual process of the applicant as an example, the MVR system can generate about 420 tons of steam condensate water per hour, and the configuration of bisphenol A sodium salt solution can be completely satisfied.
The steam condensate water has higher temperature and higher evaporation rate, and the conductivity is easy to be increased, thereby influencing the yellow index of bisphenol A sodium salt solution. In some examples of this embodiment, bisphenol a sodium salt solution is prepared after the vapor condensate is cooled. The temperature of the steam condensate water after being cooled is preferably 35-40 ℃.
In one or more embodiments, bisphenol A sodium salt solution is provided when the conductivity is below 90 μs/cm after the steam condensate is cooled.
In some examples of this embodiment, the steam condensate is deoxygenated to obtain deoxygenated water, which is used to prepare bisphenol A sodium salt solution. Avoiding the yellow index of bisphenol A sodium salt solution from rising caused by the excessive oxygen.
In one or more embodiments, the bisphenol A sodium salt to deoxygenated water mass ratio is 1:0.75-0.79.
In some examples of this embodiment, the valve on the secondary condensate line of the MVR system is serviced when the conductivity of the steam condensate is not less than 90 μs/cm. Through researches, the valve on the secondary condensate water pipeline has the problem of easy damage, and impurities are easy to enter due to the damage of the valve, so that the conductivity of the steam condensate water is further improved. After the valve is overhauled, the conductivity of the steam condensate can be reduced to below 90 mu s/cm.
In some examples of this embodiment, the yellow index of bisphenol a sodium salt solution is less than 0.65. The quality of the prepared polycarbonate can be ensured.
In some examples of this embodiment, bisphenol a sodium salt concentration ranges from 16.2 to 16.5%.
In some examples of this embodiment, the maximum steam condensate addition is 205-215 m 3 /h。
In another embodiment of the present invention, there is provided a polycarbonate production system comprising:
the bisphenol A sodium salt solution preparing unit is used for preparing bisphenol A sodium salt solution;
a polycarbonate synthesis unit for reacting bisphenol a sodium salt solution with phosgene to produce polycarbonate;
the purification unit is used for purifying the product materials output by the polycarbonate synthesis unit;
the wastewater treatment unit comprises a pretreatment device and an MVR system, and wastewater generated by the purification unit is subjected to pretreatment, evaporation and concentration sequentially through the pretreatment device and the MVR system;
the steam condensate water pipeline of the MVR system is provided with an electric conductivity on-line detection device and a configuration valve, and is connected with a bisphenol A sodium salt solution configuration unit, so that the steam condensate water is used for the configuration of bisphenol A sodium salt solution.
In some examples of this embodiment, the steam condensate water outlet line is provided with a steam condensate tank, and the conductivity on-line detection device and the configuration valve are provided in the steam condensate tank outlet line.
In one or more embodiments, the condenser is disposed on the water outlet line of the vapor condensate tank, and the conductivity on-line detection device and the configuration valve are disposed on the water outlet line of the condenser.
Some examples of this embodiment include a desalinated water transfer line disposed in parallel with the steam condensate water outlet line.
Some examples of this embodiment include an oxygen removal tower with a water inlet connected to the desalted water feed line and the vapor condensate water outlet line of the MVR system.
In a third embodiment of the present invention, there is provided a process for producing a polycarbonate, and a production system for the polycarbonate; according to the detection result of the conductivity online detection device, conveying the steam condensate water with the conductivity smaller than 90 mu s/cm to a bisphenol A sodium salt solution configuration unit to configure bisphenol A sodium salt solution; stopping conveying the steam condensate when the conductivity of the steam condensate is not less than 90 mu s/cm, and preparing bisphenol A sodium salt solution by desalted water; the prepared bisphenol A sodium salt solution and phosgene are utilized for producing polycarbonate.
In order to enable those skilled in the art to more clearly understand the technical scheme of the present invention, the technical scheme of the present invention will be described in detail with reference to specific embodiments.
Examples
A production system of polycarbonate comprises a bisphenol A sodium salt solution configuration unit, a polycarbonate synthesis unit, a washing and separating unit, a devolatilization drying unit, an extrusion granulating unit and a wastewater treatment unit.
Bisphenol A sodium salt solution preparing unit prepares bisphenol A sodium salt solution and then reacts with phosgene in a polycarbonate synthesizing unit to obtain polycarbonate, and materials after the reaction of the polycarbonate synthesizing unit sequentially pass through a washing separation unit, a devolatilization drying unit and an extrusion granulating unit to obtain a polycarbonate finished product.
And the wastewater generated by the washing and separating unit enters a wastewater treatment unit for wastewater treatment. The wastewater treatment unit comprises a pretreatment device and an MVR system which are sequentially connected. The steam condensate outlet of the MVR system is connected with a steam condensate tank.
The bisphenol A sodium salt solution configuration unit, as shown in figure 1, comprises a steam condensate tank 1, a steam condensate heat exchanger 5, a deoxidizing tower 11, a deoxidizing water tank 12 and a bisphenol A sodium salt prefabricated tank 17 which are connected in sequence. The inlet of the deoxidizing tower 11 is also connected with a desalting water tank 9.
The connecting pipeline between the steam condensate tank 1 and the steam condensate heat exchanger 5 is provided with a steam condensate pump 2 and a steam condensate water inlet heat exchanger valve 3. The circulating water inlet and the circulating water outlet of the steam condensate heat exchanger 5 are respectively provided with a circulating water feeding valve 4 and a circulating water return valve 6. The connecting pipeline between the steam condensate heat exchanger 5 and the deoxidizing tower 11 is provided with a steam condensate regulating valve 7 and a steam condensate pipeline check valve 8.
A connecting pipeline between the deoxidizing tower 11 and the desalting water tank 9 is provided with a desalting water pump 10.
The connecting pipeline between the deoxidizing water tank 12 and the bisphenol A sodium salt prefabricating tank 17 is provided with a deoxidizing water pump 13, a deoxidizing water adjusting valve 14 and a deoxidizing water pipeline check valve 15. A 32% caustic soda regulating valve 16 is provided on the 32% caustic soda line at the inlet of bisphenol a sodium salt prep tank 17.
The technological process is as follows:
1. the steam condensate in the steam condensate tank 1 is cooled to 35-40 ℃ by a steam condensate heat exchanger 5 and then is conveyed.
2. By detecting the conductivity of the steam condensate water after heat exchange, if the conductivity is smaller than 90 mu s/cm, the steam condensate water can be conveyed to the deoxidizing tower 11 for deoxidization and then conveyed to the deoxidizing water tank 12 after deoxidization.
3. The valve of the desalted water in the desalted water tank 9 entering the deoxidizing tower 11 is closed, the deoxidized steam condensate water can be conveyed to the bisphenol A sodium salt preparation process through the original desalted water pipeline, the steam condensate water can be added into the bisphenol A sodium salt preparation tank, and the bisphenol A sodium salt solution with the concentration of 16.2-16.5% (mass percent) is prepared by fully stirring and mixing with caustic soda and bisphenol A according to a certain proportion.
4. The water quantity of the steam condensate water is regulated by a regulating valve on the pipeline, the addition quantity of the desalted water is regulated by the opening of a desalted water valve, and the consumption of the steam condensate water and the desalted water is regulated in real time according to different conditions;
5. the chromaticity and the yellow index of the bisphenol A sodium salt solution are monitored in real time by using an online colorimeter and a colorimeter, and the chromaticity and the yellow index are kept below 0.65, so that the process control of the preparation quality of the bisphenol A sodium salt is realized.
6. In the adding process, by increasing the water quantity of the steam condensate, if the chromaticity and the yellow index can be kept in the normal range, the desalted water can be completely replaced by the steam condensate.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for saving water and reducing consumption in the polycarbonate production process is characterized by providing steam condensate water, detecting the conductivity of the steam condensate water, preparing bisphenol A sodium salt solution by using the steam condensate water with the conductivity less than 90 mu s/cm instead of desalted water, and producing polycarbonate by using the prepared bisphenol A sodium salt solution; the steam condensate water is condensate water of an MVR system in the polycarbonate production process; and when the conductivity of the steam condensate water is not less than 90 mu s/cm, overhauling a valve on a secondary condensate water pipeline of the MVR system.
2. The method for saving water and reducing consumption in the production process of polycarbonate according to claim 1, wherein bisphenol A sodium salt solution is prepared after the steam condensate water is cooled.
3. The method for saving water and reducing consumption in the production process of polycarbonate according to claim 1, wherein the deoxidized water is obtained after deoxidizing the steam condensate water, and bisphenol A sodium salt solution is prepared by using the deoxidized water.
4. The method for saving water and reducing consumption in polycarbonate production process according to claim 1, wherein the yellow index of bisphenol a sodium salt solution is lower than 0.65.
5. A polycarbonate production system, characterized in that the method for realizing water saving and consumption reduction in the polycarbonate production process according to claim 1 comprises the following steps:
the bisphenol A sodium salt solution preparing unit is used for preparing bisphenol A sodium salt solution;
a polycarbonate synthesis unit for reacting bisphenol a sodium salt solution with phosgene to produce polycarbonate;
the purification unit is used for purifying the product materials output by the polycarbonate synthesis unit;
the wastewater treatment unit comprises a pretreatment device and an MVR system, and wastewater generated by the purification unit is subjected to pretreatment, evaporation and concentration sequentially through the pretreatment device and the MVR system;
the steam condensate water pipeline of the MVR system is provided with an electric conductivity on-line detection device and a configuration valve, and is connected with a bisphenol A sodium salt solution configuration unit, so that the steam condensate water is used for the configuration of bisphenol A sodium salt solution.
6. The polycarbonate production system as described in claim 5, wherein a steam condensate water outlet line is provided with a steam condensate tank, and the conductivity on-line detecting device and the configuration valve are provided in the steam condensate water outlet line.
7. The polycarbonate production system of claim 5, comprising a desalted water supply line disposed in parallel with the water outlet line for steam condensate.
8. The polycarbonate production system of claim 5, comprising an oxygen removal column having a water inlet connected to the desalted water feed line and the vapor condensate water outlet line of the MVR system.
9. A process for producing a polycarbonate, characterized by providing the polycarbonate production system according to any one of claims 5 to 8; according to the detection result of the conductivity online detection device, conveying the steam condensate water with the conductivity smaller than 90 mu s/cm to a bisphenol A sodium salt solution configuration unit to configure bisphenol A sodium salt solution; stopping conveying the steam condensate when the conductivity of the steam condensate is not less than 90 mu s/cm, and preparing bisphenol A sodium salt solution by desalted water; the prepared bisphenol A sodium salt solution and phosgene are utilized for producing polycarbonate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104910401A (en) * | 2015-04-17 | 2015-09-16 | 聊城鲁西聚碳酸酯有限公司 | Polycarbonate and solvent separation system, and method thereof |
| CN113521789A (en) * | 2021-08-09 | 2021-10-22 | 聊城鲁西聚碳酸酯有限公司 | Device for treating organic steam in polycarbonate production process, method and application thereof |
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| DE102009032020A1 (en) * | 2009-07-07 | 2011-01-13 | Bayer Materialscience Ag | Process for the production of polycarbonate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104910401A (en) * | 2015-04-17 | 2015-09-16 | 聊城鲁西聚碳酸酯有限公司 | Polycarbonate and solvent separation system, and method thereof |
| CN113521789A (en) * | 2021-08-09 | 2021-10-22 | 聊城鲁西聚碳酸酯有限公司 | Device for treating organic steam in polycarbonate production process, method and application thereof |
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