CN217189459U - Synthesis device of polyester polycarbonate copolymer dihydric alcohol - Google Patents
Synthesis device of polyester polycarbonate copolymer dihydric alcohol Download PDFInfo
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- CN217189459U CN217189459U CN202220884006.XU CN202220884006U CN217189459U CN 217189459 U CN217189459 U CN 217189459U CN 202220884006 U CN202220884006 U CN 202220884006U CN 217189459 U CN217189459 U CN 217189459U
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Abstract
The utility model discloses a synthesizer of polyester polycarbonate copolymer dihydric alcohol utilizes phthalic anhydride or terephthalic acid, dihydric alcohol, carbon dioxide to carry out copolymerization three times at least, synthesizes polyester polycarbonate copolymer dihydric alcohol of macromolecular weight, obtains the dihydric alcohol that contains polyester polycarbonate block copolymer to there are different sequence structures, and it is compared in traditional polyether type dihydric alcohol, has better oxidation resistance and biodegradable ability; the product polyester polycarbonate copolymer dihydric alcohol can be used for subsequent synthesis of plastics or polyurethane, is beneficial to enhancing and improving the physical properties of polymers such as polyurethane and the like, and can effectively ensure the quality and the yield of copolymer products; meanwhile, the copolymer dihydric alcohol is synthesized by the scheme, the used catalytic system can be completely carried out under normal pressure/reduced pressure, the reaction condition is very mild, a dehydrating agent is not required to be introduced, the cost of the used raw materials is lower, and the method is more suitable for large-scale production.
Description
Technical Field
The utility model relates to a polyester polycarbonate copolymer dihydric alcohol and synthesis technology and reaction unit field thereof especially relate to a synthesize non-polyether type and biodegradable dihydric alcohol's technique through phthalic anhydride or phthalic acid, aliphatic dihydric alcohol and carbon dioxide copolymerization.
Background
Since the industrial revolution, the emission of greenhouse gases has increased year by year, which causes global warming, the greenhouse effect has been accumulated continuously, which causes a series of environmental and ecological problems, and the main greenhouse gas causing the problems is carbon dioxide.
In order to cope with the problems, the united nations proposed advices and targets of carbon peak-reaching and carbon neutralization in 2018, and China perfects relevant policies continuously in recent two years and carries out overall deployment to achieve the target of carbon peak-reaching, carbon neutralization and 'double-carbon'.
Therefore, how to reasonably and effectively utilize the carbon dioxide is a green technical route for effectively utilizing the carbon resource, changing waste into valuable and reducing the greenhouse effect.
Nowadays, the resource utilization of carbon dioxide is always an important issue for sustainable development of society, and particularly, with carbon dioxide as a valuable carbon resource, many researchers have done a lot of work, for example, the reaction of carbon dioxide and alcohols to produce chemical products of carbonates is one of important ideas.
Aiming at the synthesis process and the device of the polyester polycarbonate copolymer dihydric alcohol, at present, some mature synthesis processes and reaction devices exist in the existing market, but the synthesis processes and the reaction devices can not be carried out under normal pressure/reduced pressure conditions, the reaction conditions are harsh, the method is not suitable for large-scale production, and the quality and the yield of copolymer products can not be ensured.
Disclosure of Invention
In order to solve the technical problem, the utility model also provides a synthesizer of biodegradable polyester polycarbonate copolymer dihydric alcohol, need not to introduce the dehydrating agent, and the cost is lower, more is fit for large-scale production.
The technical scheme of the utility model as follows: a synthetic device of biodegradable polyester polycarbonate copolymer dihydric alcohol comprises a raw material kettle, at least three polymerization reaction kettles, a storage unit and a drying tower;
the upper part of the raw material kettle is provided with a raw material inlet of the raw material kettle, the lower part of the raw material kettle is provided with a gas inlet of the raw material kettle, and the bottom of the raw material kettle is provided with a raw material outlet of the raw material kettle; the raw material inlet of the raw material kettle is used for adding dihydric alcohol, a solvent and phthalic anhydride or terephthalic acid into the raw material kettle through a pipeline, the gas inlet of the raw material kettle is used for introducing nitrogen with certain air pressure into the raw material kettle through a pipeline, and the raw material outlet of the raw material kettle is communicated with the raw material inlet of the first polymerization reaction kettle through a pipeline;
the upper part of each polymerization reaction kettle is provided with a respective raw material inlet, the top part is provided with a respective gas outlet, the bottom part is provided with a respective gas inlet, and the lower part is provided with a respective product outlet; the gas inlet is used for respectively introducing carbon dioxide with certain pressure into the corresponding polymerization reaction kettle through a pipeline, and the gas outlet is used for discharging unreacted carbon dioxide in the corresponding polymerization reaction kettle;
among the communicated multiple polymerization reaction kettles, the product outlet of the former polymerization reaction kettle is communicated to the raw material inlet of the latter polymerization reaction kettle through a corresponding pipeline; a product outlet of the last polymerization reactor is communicated to an inlet end of a storage unit through a pipeline, and an outlet end of the storage unit is an outlet end of the target product copolymer dihydric alcohol;
the gas outlets of all the polymerization reaction kettles are gathered by a pipeline and then communicated to the inlet end of the drying tower, and the outlet end of the drying tower is gathered to the gas main inlet pipeline by a pipeline and then returns to the input pipeline for collecting the unreacted carbon dioxide in all the polymerization reaction kettles, and the unreacted carbon dioxide is dried by the drying tower and then recycled.
The biodegradable polyester polycarbonate copolymer dihydric alcohol synthesis device comprises: and the pipelines for communicating the product outlet of the previous polymerization reactor with the raw material inlet of the next polymerization reactor are respectively provided with a conveying pump for conveying the liquid product at the lower part of the previous polymerization reactor to the upper part of the next polymerization reactor.
The biodegradable polyester polycarbonate copolymer dihydric alcohol synthesis device comprises: and a stirring device is arranged in the raw material kettle.
The biodegradable polyester polycarbonate copolymer dihydric alcohol synthesis device comprises: all polymerization reaction kettles adopt fixed bed reaction kettles, the internal stationary phase is a catalyst, the lower part is provided with a corresponding gas inlet end, gas can flow from the lower part to the upper part, the upper part is provided with a corresponding raw material inlet end, and liquid can flow from the upper part to the lower part.
The biodegradable polyester polycarbonate copolymer dihydric alcohol synthesis device comprises: the length-diameter ratio of the raw material kettle is 3-5, and the length-diameter ratio of each polymerization reaction kettle is 3-5.
The biodegradable polyester polycarbonate copolymer dihydric alcohol synthesis device comprises: the diameters of pipelines communicating the product outlet of the previous polymerization reactor and the raw material inlet of the next polymerization reactor are both 50-100 mm; the gas inlet of each polymerization reaction kettle is connected with a gas distributor, and the aperture on the gas distributor is 1-5 mm.
The utility model provides a synthesizer of biodegradable polyester polycarbonate copolymer dihydric alcohol utilizes phthalic anhydride or terephthalic acid, dihydric alcohol, carbon dioxide to carry out copolymerization three times at least, synthesizes polyester polycarbonate copolymer dihydric alcohol of macromolecular weight, obtains the dihydric alcohol that contains polyester polycarbonate block copolymer to there are different sequence structures, and it is compared in traditional polyether type dihydric alcohol, has better antioxidant property and biodegradable ability; the product polyester polycarbonate copolymer dihydric alcohol can be used for subsequent synthesis of plastics or polyurethane, is beneficial to enhancing and improving the physical properties of polymers such as polyurethane and the like, and can effectively ensure the quality and the yield of copolymer products; meanwhile, the copolymer dihydric alcohol is synthesized by the scheme, the used catalytic system can be completely carried out under normal pressure/reduced pressure, the reaction condition is very mild, a dehydrating agent is not required to be introduced, the cost of the used raw materials is lower, and the method is more suitable for large-scale production.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way; the shapes, the proportional sizes and the like of the various components in the drawings are only schematic and are used for helping the understanding of the invention, and the shapes, the proportional sizes and the like of the various components of the invention are not particularly limited; the skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation.
FIG. 1 is a schematic structural diagram of an embodiment of the apparatus for synthesizing biodegradable polyester polycarbonate copolymer diol according to the present invention;
FIG. 2 is a schematic diagram of the synthetic route and flow of the biodegradable polyester polycarbonate copolymer diol of the present invention;
FIG. 3 is a table of data from a specific conditioning experiment for the synthesis of biodegradable polyester polycarbonate copolymer diols in accordance with the present invention;
the various reference numbers in the figures are summarized: a raw material kettle 1, a raw material inlet 1-1 of the raw material kettle, a gas inlet 1-2 of the raw material kettle, a raw material outlet 1-3 of the raw material kettle, a first polymerization reaction kettle 2, a first raw material inlet 2-1, a first gas inlet 2-2, a first gas outlet 2-3, a first product outlet 2-4, a second polymerization reaction kettle 3, a second raw material inlet 3-1, a second gas inlet 3-2, a second gas outlet 3-3, a second product outlet 3-4, a third polymerization reaction kettle 4, a third raw material inlet 4-1, a third gas inlet 4-2, a third gas outlet 4-3, a third product outlet 4-4, a storage unit 5, an inlet end 5-1 (of the storage unit 5), an outlet end 5-2 (of the storage unit 5), a drying tower 6, An inlet end 6-1 (of the drying tower 6), an outlet end 6-1 (of the drying tower 6), transfer pumps (7, 8), and pipelines (9, 10, 11, 12, 13, 14, 15, 16, 17, 18).
Detailed Description
The following detailed description and examples of the present invention are provided in connection with the accompanying drawings, which are set forth for the purpose of illustration only and are not intended to limit the invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a synthesis apparatus for biodegradable polyester polycarbonate copolymer diol of the present invention, and the synthesis apparatus (or reaction apparatus) for biodegradable polyester polycarbonate copolymer diol of the present invention comprises a raw material kettle 1, three polymerization reaction kettles (2, 3, 4), a storage unit 5 and a drying tower 6; wherein:
the upper part of the raw material kettle 1 is provided with a raw material inlet 1-1 of the raw material kettle, the lower part is provided with a gas inlet 1-2 of the raw material kettle, and the bottom is provided with a raw material outlet 1-3 of the raw material kettle; the raw material kettle inlet 1-1 is used for adding dihydric alcohol, a solvent and phthalic anhydride or terephthalic acid into the raw material kettle 1 through a pipeline 9, the raw material kettle gas inlet 1-2 is used for introducing nitrogen with certain air pressure into the raw material kettle 1 through a pipeline 10, and the raw material kettle outlet 1-3 is communicated with the first raw material inlet 2-1 of the first polymerization reaction kettle 2 through a pipeline 11;
for three polymerization reaction kettles (2, 3, 4), the upper parts of the three polymerization reaction kettles are provided with respective raw material inlets (2-1, 3-1, 4-1), the tops of the three polymerization reaction kettles are provided with respective gas outlets (2-3, 3-3, 4-3), the bottoms of the three polymerization reaction kettles are provided with respective gas inlets (2-2, 3-2, 4-2), and the lower parts of the three polymerization reaction kettles are provided with respective product outlets (2-4, 3-4, 4-4); the gas inlets (2-2, 3-2 and 4-2) are used for respectively introducing carbon dioxide with certain pressure into the corresponding polymerization reaction kettles (2, 3 and 4) through pipelines 12, and the gas outlets (2-3, 3-3 and 4-3) are used for discharging unreacted carbon dioxide in the corresponding polymerization reaction kettles (2, 3 and 4);
among the three polymerization reaction kettles (2, 3, 4) which are communicated with each other, the product outlets (2-4, 3-4) of the previous polymerization reaction kettle (2, 3) are communicated with the raw material inlets (3-1, 4-1) of the next polymerization reaction kettle (3, 4) through corresponding pipelines (14, 15); a third product outlet 4-4 of the third polymerization reactor 4 is communicated to an inlet end 5-1 of the storage unit 5 through a pipeline 16, and an outlet end 5-2 of the storage unit 5 is an outlet end of the target product copolymer dihydric alcohol;
and the gas outlets (2-3, 3-3, 4-3) of the three polymerization reaction kettles (2, 3, 4) are communicated to the inlet end 6-1 of the drying tower 6 after being gathered by a pipeline 13, the outlet end 6-2 of the drying tower 6 is gathered to a gas main inlet pipeline 18 by a pipeline 17 and then returns to the input pipeline 12, and the gas outlets are used for collecting unreacted carbon dioxide in the three polymerization reaction kettles (2, 3, 4) and recycling the carbon dioxide after being dried by the drying tower 6.
Specifically, a first delivery pump 7 is arranged on a pipeline 14 communicating a product outlet 2-4 of the first polymerization reactor 2 with a raw material inlet 3-1 of the second polymerization reactor 3, and is used for delivering a liquid product at the lower part of the first polymerization reactor 2 to the upper part of the second polymerization reactor 3; a first delivery pump 8 is arranged on a pipeline 15 communicating the product outlet 3-4 of the second polymerization reactor 3 with the raw material inlet 4-1 of the third polymerization reactor 4 and is used for delivering the liquid product at the lower part of the second polymerization reactor 3 to the upper part of the third polymerization reactor 4.
Preferably, a stirring device is arranged in the raw material kettle 1, so that the raw materials in the raw material kettle 1 can be uniformly mixed, and the first-step reaction can be accelerated to be completed.
Preferably, the three polymerization reaction kettles (2, 3 and 4) are all fixed bed reaction kettles, the internal stationary phases are all catalysts, the lower parts of the three polymerization reaction kettles are provided with corresponding gas inlet ends, gas can flow from the lower parts to the upper parts, the upper parts of the three polymerization reaction kettles are provided with corresponding raw material inlet ends, and liquid can flow from the upper parts to the lower parts, so that the gas-liquid-solid three-phase mixing can be realized more favorably.
Specifically, the length-diameter ratio of the raw material kettle 1 is between 3 and 5, and the length-diameter ratio of each polymerization reaction kettle (2, 3 and 4) is between 3 and 5.
Specifically, the diameters of pipelines (14, 15) communicating product outlets (2-4, 3-4) of the previous polymerization reaction kettle (2, 3) with raw material inlets (3-1, 4-1) of the next polymerization reaction kettle (3, 4) are both 50-100 mm; the gas inlets (2-2, 3-2, 4-2) of the three polymerization reaction kettles (2, 3, 4) are respectively connected with a gas distributor (not shown in the figure), and the pore diameter on the gas distributor is 1-5 mm.
The above examples of the apparatus for synthesizing the biodegradable polyester/polycarbonate copolymer diol are all exemplified by three polymerization reaction vessels (2, 3, 4) connected in series, but the above series connection may be carried out by using three or more polymerization reaction vessels depending on the actual production scale.
Based on above-mentioned biodegradable polyester polycarbonate copolymer diol's synthesizer embodiment, the utility model provides a biodegradable polyester polycarbonate copolymer diol's synthetic method is used in above-mentioned biodegradable polyester polycarbonate copolymer diol's synthesizer, combines fig. 2 to show, fig. 2 is the utility model discloses biodegradable polyester polycarbonate copolymer diol's synthetic route and flow schematic diagram still use three polymerization cauldron (2, 3, 4) of establishing ties as an example, and this synthetic method mainly includes following step:
step S110, injecting an excessive amount of diol (e.g. ethylene glycol or propylene glycol) and a certain amount of phthalic anhydride or terephthalic acid into the raw material kettle 1 through the pipeline 9 and the raw material kettle raw material inlet 1-1, introducing a certain amount of nitrogen through the pipeline 10 and the raw material kettle gas inlet 1-2 while stirring and mixing, and stirring for a period of time under a nitrogen atmosphere, so that a part of diol (i.e. the substance B in the first reaction formula) and phthalic anhydride or terephthalic acid (i.e. the substance a in the first reaction formula) are mixed according to a ratio of 1: 1, carrying out esterification reaction to obtain esterification dihydric alcohol (namely a substance C in the first reaction formula), which is a first step reaction;
step S120, injecting a mixture of unesterified diol (i.e. substance B in the second reaction formula) and esterified diol (i.e. substance C in the second reaction formula) in the raw material kettle 1 into the upper part of the first polymerization reaction kettle 2 through the pipeline 11 and the first raw material inlet 2-1, flowing from the upper part to the lower part through the stationary phase, introducing carbon dioxide gas (i.e. substance D in the second reaction formula) into the first polymerization reaction kettle 2 through the pipeline 12 and the first gas inlet 2-2, blowing from the lower part to the upper part through the stationary phase, and carrying out polymerization reaction on the diol (i.e. substance B in the second reaction formula), esterified diol (i.e. substance C in the second reaction formula) and carbon dioxide (i.e. substance D in the second reaction formula) at the stationary phase catalyst to obtain polyester polycarbonate copolymer diol (i.e. substance F in the second reaction formula, wherein a, B, C, n is an integer greater than 1), which is the second reaction step;
step S130, after passing through the three polymerization reaction kettles (2, 3 and 4), obtaining polyester polycarbonate copolymer dihydric alcohol with the molecular weight of more than 2000, collecting the product of the third polymerization reaction kettle 4 through a third product outlet 4-4, and conveying the product to a storage unit 5 through a pipeline 16 to be used as a reaction raw material for storage, so as to further react and produce polymers such as polyurethane.
The specific embodiment is as follows: taking a 30L raw material kettle 1 and three 30L polymerization reaction kettles (2, 3, 4) connected in series as an example, the diameters of pipelines (11, 14, 15, 16) communicated with respective raw material inlets (2-1, 3-1, 4-1) and respective product outlets (2-4, 3-4, 4-4) of each polymerization reaction kettle (2, 3, 4) are all 50 mm, the tail ends of pipelines (12) which enter each polymerization reaction kettle (2, 3, 4) through respective gas inlets (2-2, 3-2, 4-2) and are communicated with carbon dioxide can be directly connected with a gas distributor (not shown in the figure), and the pore diameters on the gas distributors are all 2 mm.
Adding terephthalic acid and ethylene glycol into a raw material kettle 1, wherein the molar ratio of the terephthalic acid to the ethylene glycol is 1: 2.05, slightly excessive glycol, purging with nitrogen, and stirring at 215 ℃ for reaction for 10 hours; then introducing the raw material liquid in the raw material kettle 1 into three polymerization reaction kettles (2, 3 and 4), purging with carbon dioxide, controlling the reaction temperature at 210 ℃, and obtaining the polyester polycarbonate copolymer diol with the molecular weight of 3000 after the three polymerization reaction kettles (2, 3 and 4) react; the target product copolymer dihydric alcohol can be used as a reaction raw material to further react to produce polymers such as polyurethane and the like, is favorable for enhancing and improving the performance of the polymers such as polyurethane and the like, and ensures the quality and the yield of the copolymer products such as polyurethane and the like.
Based on the synthetic method of the biodegradable polyester polycarbonate copolymer dihydric alcohol, the utility model also provides a biodegradable polyester polycarbonate copolymer dihydric alcohol, the molecular formula of which is
Wherein a, b and n are integers which are more than or equal to 1; the biodegradable polyester polycarbonate copolymer dihydric alcohol is prepared by the synthesis method of the biodegradable polyester polycarbonate copolymer dihydric alcohol.
Through the biodegradable polyester polycarbonate copolymer dihydric alcohol and the synthesis method and the reaction device thereof, the obtained product biodegradable polyester polycarbonate copolymer dihydric alcohol has a regular structure and adjustable performance, because the sequence structure of the copolymer dihydric alcohol (namely the substance F in the second reaction formula) can be controlled by adjusting the dosage proportion of the raw material dihydric alcohol (namely the substance B in the first reaction formula in figure 2), and the specific adjustment experimental data can be seen in the attached table shown in figure 3 in detail; as can be seen from the attached table, on the one hand, increasing the ratio of the amount of ethylene glycol (i.e., substance B in the first reaction scheme of FIG. 1) with the same amount of terephthalic acid (i.e., substance A in the first reaction scheme of FIG. 2), i.e., increasing the molar ratio of both (i.e., substance A: substance B), increases the polymer selectivity, decreases the polycarbonate content, increases the polyester content, and increases the molecular weight of the resulting copolymer diol (i.e., substance F in the second reaction scheme of FIG. 2); on the other hand, even if the molar ratio of the two (i.e., substance A: substance B) is not changed, the molecular weight of the resulting copolymer diol (i.e., substance F in the second reaction formula of FIG. 2) is significantly reduced when the amount of both is reduced.
Meanwhile, as the benzene rings are separated by carbonate bonds, the biodegradation performance is better; the cost of the raw material (namely ethylene glycol or propylene glycol) is lower, so that the method is more suitable for large-scale production; the product isCan be used for subsequent synthesis of plastics or polyurethane, and is beneficial to enhancing the physical property of the copolymer; in addition, the reaction device of the biodegradable polyester polycarbonate copolymer dihydric alcohol is a normal pressure reaction, and has low requirement on equipment; no extra equipment is required for separation between catalyst and product; a dehydrating agent is not needed to be added, and the reaction condition is mild; and the reaction device realizes the surplus CO 2 The recycling of the waste water reaches the requirement of green chemistry.
Those not described in detail in this specification are well within the skill of those in the art.
It should be understood that the above description is only a preferred embodiment of the present invention, and should not be construed as limiting the technical scope of the present invention, and that the person skilled in the art can add, subtract, replace, change or modify the above description within the spirit and principle of the present invention, and all the technical solutions of the add, subtract, change or modify should belong to the protection scope of the appended claims.
Claims (6)
1. A biodegradable polyester polycarbonate copolymer diol synthesizer, which is characterized by comprising: the device comprises a raw material kettle, at least three polymerization reaction kettles, a storage unit and a drying tower;
the upper part of the raw material kettle is provided with a raw material inlet of the raw material kettle, the lower part of the raw material kettle is provided with a gas inlet of the raw material kettle, and the bottom of the raw material kettle is provided with a raw material outlet of the raw material kettle; the raw material inlet of the raw material kettle is used for adding dihydric alcohol, a solvent and phthalic anhydride or terephthalic acid into the raw material kettle through a pipeline, the gas inlet of the raw material kettle is used for introducing nitrogen with certain air pressure into the raw material kettle through a pipeline, and the raw material outlet of the raw material kettle is communicated with the raw material inlet of the first polymerization reaction kettle through a pipeline;
the upper part of each polymerization reaction kettle is provided with a respective raw material inlet, the top part is provided with a respective gas outlet, the bottom part is provided with a respective gas inlet, and the lower part is provided with a respective product outlet; the gas inlet is used for respectively introducing carbon dioxide with certain pressure into the corresponding polymerization reaction kettle through a pipeline, and the gas outlet is used for discharging unreacted carbon dioxide in the corresponding polymerization reaction kettle;
among the communicated multiple polymerization reaction kettles, the product outlet of the former polymerization reaction kettle is communicated to the raw material inlet of the latter polymerization reaction kettle through a corresponding pipeline; a product outlet of the last polymerization reactor is communicated to an inlet end of a storage unit through a pipeline, and an outlet end of the storage unit is an outlet end of the target product copolymer dihydric alcohol;
the gas outlets of all the polymerization reaction kettles are gathered by a pipeline and then communicated to the inlet end of the drying tower, and the outlet end of the drying tower is gathered to the gas main inlet pipeline by a pipeline and then returns to the input pipeline for collecting the unreacted carbon dioxide in all the polymerization reaction kettles, and the unreacted carbon dioxide is dried by the drying tower and then recycled.
2. The apparatus for synthesizing biodegradable polyester polycarbonate copolymer diol according to claim 1, wherein: and the pipelines for communicating the product outlet of the previous polymerization reactor with the raw material inlet of the next polymerization reactor are respectively provided with a conveying pump for conveying the liquid product at the lower part of the previous polymerization reactor to the upper part of the next polymerization reactor.
3. The apparatus for synthesizing biodegradable polyester polycarbonate copolymer diol according to claim 1, wherein: and a stirring device is arranged in the raw material kettle.
4. The apparatus for synthesizing biodegradable polyester polycarbonate copolymer diol according to claim 1, wherein: all polymerization reaction kettles adopt fixed bed reaction kettles, the internal fixed phase is a catalyst, the lower part of each polymerization reaction kettle is provided with a corresponding gas inlet end, gas flows from the lower part to the upper part, the upper part of each polymerization reaction kettle is provided with a corresponding raw material inlet end, and liquid flows from the upper part to the lower part.
5. The apparatus for synthesizing biodegradable polyester polycarbonate copolymer diol according to claim 1, wherein: the length-diameter ratio of the raw material kettle is 3-5, and the length-diameter ratio of each polymerization reaction kettle is 3-5.
6. The apparatus for synthesizing biodegradable polyester polycarbonate copolymer diol according to claim 1, wherein: the diameters of pipelines communicating the product outlet of the previous polymerization reactor and the raw material inlet of the next polymerization reactor are both 50-100 mm; the gas inlet of each polymerization reaction kettle is connected with a gas distributor, and the aperture on the gas distributor is 1-5 mm.
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