Preparation system of rosin polyoxyethylene ether and method for preparing rosin polyoxyethylene ether by using preparation system

Abstract

The invention belongs to the technical field of polyether synthesis, and discloses a preparation system of rosin polyoxyethylene ether and a method for preparing rosin polyoxyethylene ether by using the preparation system. The preparation system provided by the invention comprises an oligomer preparation system and a polyether preparation system, the oligomer preparation system firstly prepares a rosin polyoxyethylene ether oligomer, and conveys the rosin polyoxyethylene ether oligomer into the polyether preparation system through a third conveying device to prepare rosin polyoxyethylene ether. By adopting the preparation system to prepare rosin polyoxyethylene ether, the rosin melting time can be greatly shortened, and the melting time is less than 1 / 3 of that of a conventional method; the preparation system can also increase the heating area of rosin and realize uniform heating, and the prepared product is narrow in molecular weight distribution, light in color, good in emulsifying property and excellent in quality.

Description

Technical Field

[0001] The invention belongs to the technical field of polyether synthesis, and particularly relates to a preparation system of rosin polyoxyethylene ether and a method for preparing rosin polyoxyethylene ether by using the system. Background Art

[0002] Rosin polyoxyethylene ether is a nonionic surfactant synthesized by the reaction of rosin with ethylene oxide (EO) under the action of a catalyst. The main component of rosin is rosin acid, which has tricyclic diterpenes in its structure. The rosin polyoxyethylene ether synthesized after ethoxylation has strong emulsification and dispersing ability, and can significantly reduce the surface tension of the aqueous solution. It can be directly or compounded into various industrial cleaning agents and household detergents, and can also be directly used as an emulsifier for various oils and skin care products, and can also be used as an emulsifier for emulsion-type contact insecticides. As a detergent, the decontamination ability of rosin polyoxyethylene ether is better than that of fatty alcohol polyoxyethylene ether. Its aqueous solution does not have the greasy feeling of alkaline solution of washing powder and laundry soap, has very little foam, can be cleaned by water, is easy to rinse, and has a mild nature. After use, the skin will not dry out and will not hurt the hands. It is a detergent material with excellent performance. Rosin is a natural product and a cheap and abundant renewable filling chemical raw material.

[0003] The synthesis method of rosin polyoxyethylene ether has been reported. Wang Yan and Zhou Yonghong published "Synthesis and Properties of Rosin Acid Polyoxyethylene Ester" in the journal "Forest Products Chemistry and Industry" in 1996, which studied the reaction of rosin acid and ethylene oxide after dehydration at 180°C. After the reaction was completed, the temperature was lowered to below 100°C for bleaching and neutralization to obtain rosin acid polyoxyethylene esters with different polymerization degrees and the properties were compared; Zheng Naixin et al. published "Synthesis of Rosin Acid Polyoxyethylene Ester (PORE) and Its Application in Papermaking Sizing Agent" in the Journal of Dezhou University in 2002, which studied the reaction of rosin acid polyoxyethylene ester with KOH as catalyst, ethylene oxide was added after vacuum dehydration at 140-180°C; Zhou Cun et al. published "Research on the Synthesis Technology and Performance of Rosin Acid Polyoxyethylene Ester" in the Journal of Tianjin Polytechnic University in 2004. They used 0.3%-0.5% KOH by weight of the product as a catalyst, vacuum dehydrated at 105-120°C, added ethylene oxide at 140-180°C for reaction, added acid for neutralization after the reaction, and then added an adsorbent for filtration to obtain the rosin polyoxyethylene ester product; Che Wencheng et al. published "Synthesis of Rosin Polyoxyethylene Ether Nonionic Surfactant" in the journal Chemical Technology and Development in 2012. They used KOH and homemade catalyst B at 120°C, 150°C, 180°C, and 200°C to obtain products with different polymerization degrees and compared them. Patent CN201210037761.5 discloses a method for preparing a rosin polyoxyethylene ether nonionic surfactant: using ethanol or acetone accounting for 20%-110% of the weight of the solid rosin as a solvent, using potassium hydroxide or sodium hydroxide accounting for 1-5‰ of the weight of the solid rosin as a catalyst, after vacuuming out the ethanol or acetone at 90-120°C, adding ethylene oxide at 125-185°C for reaction, and after the reaction is completed, adding glacial acetic acid to neutralize the pH value to 6.5-7.5 to obtain a rosin polyoxyethylene ether product.

[0004] The synthesis methods provided by the prior art in this field mainly include two types: 1. Using alkali metal hydroxides such as KOH and NaOH as catalysts, rosin acid and ethylene oxide react at 120-180°C to obtain rosin polyoxyethylene ether; 2. Using a solvent to dissolve rosin acid, adding a catalyst, vacuum extracting ethanol or acetone at 90-120°C, adding ethylene oxide to react at 125-185°C, and adding glacial acetic acid to neutralize the pH value to 6.5-7.5 after the reaction is completed to obtain the finished rosin polyoxyethylene ether. Both of these synthesis methods have their shortcomings. Rosin acid itself is solid and has a high melting point. Rosin acid on the market is in the form of amorphous large blocks or large particles of uneven size. Method 1 uses it to synthesize rosin polyoxyethylene ether, which takes a lot of time (production takes more than 7 hours) to melt the block rosin into liquid, and then dehydrates and adds ethylene oxide to polymerize the process section. The production cycle is long and the product molecular weight distribution is wide. Method 2 uses a solvent to dissolve rosin acid first, then heats up to remove the solvent, and then dehydrates and adds ethylene oxide polymerization process. This method will cause volatile solvent loss, high production cost and environmental pollution, and the solvent residue will also affect the emulsification performance of the product.

[0005] Therefore, there is an urgent need to provide a method for preparing rosin polyoxyethylene ether, which can prepare rosin polyoxyethylene ether with narrow product molecular weight distribution and excellent emulsification performance; and can shorten the time for synthesizing chemical materials and reduce production costs. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention provides a preparation system of rosin polyoxyethylene ether and a method for preparing rosin polyoxyethylene ether using the same. The preparation system provided by the present invention can prepare rosin polyoxyethylene ether with narrow molecular weight distribution and no solvent; and can shorten the time of synthesizing chemical materials and reduce production costs.

[0007] The present invention provides a system for preparing rosin polyoxyethylene ether, comprising:

[0008] An oligomer preparation system, comprising a first crushing device, a first screen device, a first conveying device and a first reactor; a discharge port A of the first crushing device is located above the first screen device, and materials enter the first screen device through the discharge port A; a receiving port of the first conveying device is located below the first screen device and is connected to a feed port of the first reactor, and is used to collect screened materials and convey them to the first reactor;

[0009] A polyether preparation system, comprising a second crushing device, a second screen device, a second conveying device and a second reactor; a discharge port B of the second crushing device is located above the second screen device, and materials enter the second screen device through the discharge port B; a receiving port of the second conveying device is located below the second screen device and is connected to a feed port of the second reactor, and is used to collect screened materials and convey them to the second reactor;

[0010] A third conveying device is connected to the first reaction kettle and the second reaction kettle, and is used for conveying oligomers.

[0011] Preferably, the first reactor is provided with a gas introduction device and an exhaust device.

[0012] Preferably, the second reactor is provided with a gas introduction device and an exhaust device.

[0013] Preferably, the first reaction kettle and the second reaction kettle are also provided with a vacuum pump, such as a vacuum pump. It is understandable that the first reaction kettle and the second reaction kettle can be provided with a vacuum pump respectively, or can share a vacuum pump.

[0014] Preferably, a stirring device is also provided in the first reaction kettle.

[0015] Preferably, a stirring device is also provided in the second reaction kettle.

[0016] The invention also provides a method for preparing the rosin polyoxyethylene ether.

[0017] Specifically, a method for preparing rosin polyoxyethylene ether is prepared using the above-mentioned preparation system, comprising the following steps:

[0018] (1) crushing and sieving a portion of rosin, mixing with catalyst A, and dehydrating; then heating, continuously introducing ethylene oxide to react, and obtaining rosin polyoxyethylene ether oligomers;

[0019] (2) crushing and sieving another portion of rosin, adding it to the rosin polyoxyethylene ether oligomer prepared in step (1), and adding catalyst B, dehydrating; then heating, continuously introducing ethylene oxide to react, and obtaining rosin polyoxyethylene ether.

[0020] Preferably, the rosin comprises one of hydrogenated rosin, rosin acid or disproportionated rosin.

[0021] Preferably, in step (1), the weight ratio of the portion of rosin to the ethylene oxide is 1:0.25-0.72.

[0022] Preferably, the catalyst A in step (1) and the catalyst B in step (2) are independently selected from at least one of potassium hydroxide, sodium hydroxide, potassium methoxide and sodium methoxide. The amount of the catalyst A is 0.03%-0.2% of the total weight of the rosin and the ethylene oxide in step (1). The amount of the catalyst B is 0.03%-0.2% of the total weight of the rosin and the ethylene oxide in step (2).

[0023] Preferably, the dehydration process in step (1) is: dehydration for 0.5-2h at 100-130°C and vacuum ≥-0.098MPa.

[0024] Preferably, the reaction temperature in step (1) is 120-170° C., the reaction pressure is -0.05-0.35 MPa, and the reaction time is 2-6 h.

[0025] Preferably, in step (2), the weight ratio of the rosin polyoxyethylene ether oligomer to the other part of rosin and the ethylene oxide is 1:(0.5-1.5):(1.0-10.0).

[0026] Preferably, the dehydration process in step (2) is: dehydration for 0.5-2h at 100-130°C and vacuum ≥-0.098MPa.

[0027] Preferably, the reaction temperature in step (2) is 120-170° C., the reaction pressure is -0.05-0.35 MPa, and the reaction time is 2-10 h.

[0028] Preferably, the screening process in step (1) and step (2) is: screening through a sieve with a mesh diameter of 0.2-0.5 cm.

[0029] More specifically, a method for preparing rosin polyoxyethylene ether is prepared using the above-mentioned preparation system, and the preparation method is divided into two steps:

[0030] (1) A portion of the block or granular rosin is crushed and sieved, and then added to the first reactor. After the feeding is completed and the catalyst is added, the feeding gate valve is closed, and the vacuum is evacuated to a vacuum of ≥-0.098MPa in the first reactor, and then the vacuum is closed. N2 is filled to a pressure of 0.02MPa in the first reactor, and then the vacuum is evacuated to ≥-0.098MPa, and then stirring is started, and the temperature is raised at the same time. After the temperature rises to a specified temperature, the vacuum is evacuated to ≥-0.098MPa for dehydration for 1 hour. After dehydration, the vacuum valve is closed, and a quantitative amount of ethylene oxide is continuously introduced into the reactor for reaction after the temperature is raised. After the reaction is completed, the temperature is lowered to obtain rosin polyoxyethylene ether oligomers;

[0031] (2) Add the rosin polyoxyethylene ether oligomer prepared in step (1) to the second reactor, crush and sieve another part of the block or granular rosin, add it to the second reactor, close the feeding gate valve after the rosin is added, evacuate the first reactor to a vacuum of -0.098Mpa, then close the vacuum, fill with N2 until the pressure in the reactor is 0.02MPa, evacuate to ≥-0.098MPa, start stirring, and heat up at the same time. After the temperature rises to the specified temperature, vacuum ≥-0.098Mpa for dehydration for 1h. After dehydration is completed, close the vacuum valve, continue to introduce quantitative ethylene oxide for reaction after heating, and cool down after the reaction is completed to obtain the rosin polyoxyethylene ether finished product.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The preparation system of the present invention is used to prepare rosin polyoxyethylene ether, which can greatly shorten the melting time of rosin, and the melting time is less than one-third of that of the conventional method; the preparation system can also increase the heating area of ​​rosin, heat it evenly, and the prepared product has a narrow molecular weight distribution, light color, good emulsification performance and excellent quality.

[0034] 2. The preparation method of allyl alcohol polyoxyethylene ether provided by the present invention adopts the above-mentioned preparation system for preparation, first prepares rosin polyoxyethylene ether oligomer, and then uses rosin polyoxyethylene ether oligomer and rosin mixture as starting materials to prepare allyl alcohol polyoxyethylene ether, greatly shortens the rosin melting time, and the material is heated evenly. The obtained product has a narrow molecular weight distribution, light color, good emulsification performance, does not contain solvent, and has excellent quality. And the preparation method can effectively reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The schematic diagram of the structure of the preparation system of rosin polyoxyethylene ether in the embodiment of the present invention;

[0036] Description of Figure Numbers:

[0037] An oligomer preparation system 100, a first crushing device 110, a first screen device 120, a first conveying device 130, a first reaction kettle 140, and a first stirring device 141;

[0038] Polyether preparation system 200, second crushing device 210, second screen device 220, second conveying device 230, second reaction kettle 240, second stirring device 241;

[0039] A third conveying device 300;

[0040] Vacuuming device 400. DETAILED DESCRIPTION

[0041] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

[0042] Unless otherwise specified, the raw materials and reagents used in the following examples and comparative examples can be obtained from conventional commercial sources or by existing known methods.

[0043] The embodiment of the present invention provides a system for preparing rosin polyoxyethylene ether, comprising: an oligomer preparation system 100, a polyether preparation system 200 and a third conveying device 300, wherein the third conveying device 300 is connected to the first reactor 140 and the second reactor 240 for conveying oligomers. The oligomer preparation system 100 comprises a first crushing device 110, a first screen device 120, a first conveying device 130 and a first reactor 140; the discharge port A of the first crushing device 110 is located above the first screen device 120, and the material enters the first screen device 120 through the discharge port A; the receiving port of the first conveying device 130 is located below the first screen device 120 and is connected to the feed port of the first reactor 140, for collecting the screened material and conveying it to the first reactor 140; the first reactor 140 is provided with a gas introduction device and an exhaust device, and the first reactor 140 is also provided with a stirring device 141 for stirring the material.

[0044] The polyether preparation system 200 includes a second crushing device 210, a second screen device 220, a second conveying device 230 and a second reactor 240; the discharge port B of the second crushing device 210 is located above the second screen device 220, and the material enters the second screen device 220 through the discharge port B; the receiving port of the second conveying device 230 is located below the second screen device 220 and is connected to the feed port of the second reactor 140, for collecting the screened material and conveying it to the second reactor 240; the second reactor 240 is provided with a gas introduction device and an exhaust device, and the second reactor 240 is also provided with a stirring device 241 for stirring the material.

[0045] More specifically, a vacuum pump 400, such as a vacuum pump, is further provided on the first reactor 140 and the second reactor 240. It is understandable that the first reactor 140 and the second reactor 240 may be provided with a vacuum pump 400 respectively, or may share the vacuum pump 400.

[0046] The preparation system of the embodiment of the present invention includes an oligomer preparation system 100 and a polyether preparation system 200. The oligomer preparation system 100 first prepares rosin polyoxyethylene ether oligomers, and transports the rosin polyoxyethylene ether oligomers to the polyether preparation system 200 through the third conveying device 300 to prepare rosin polyoxyethylene ether. In the oligomer preparation process, the first crushing device 110 is first used to crush large pieces of rosin, and the small particles with a particle size of less than 0.5 cm are screened out through the first screen device 120 and put into the first reactor 140. The large particles are then brought into the first crushing device 110 through the first screen device 120 for re-crushing, so that the used rosin is changed from large pieces to small particles for synthesizing rosin polyoxyethylene ether oligomers. In the polyether preparation process, the rosin polyoxyethylene ether oligomer is transported into the second reactor 240 through the third transport device 300, and the block or granular rosin is crushed by the second crushing device 210, and then the small particles with a particle size of less than 0.5 cm are screened out by the second screen device 220 and put into the second reactor 240. The large particles are then brought into the second crushing device 210 through the second screen device 220 for re-crushing, so that the rosin used is converted from large blocks into small particles for synthesis reaction.

[0047] During the preparation of oligomers and polyethers, the pressure and vacuum degree of the first reactor 140 and the second reactor 240 are controlled by the gas introduction device, the exhaust device and the vacuum device 400. Specifically, N2 can be filled into the reactor by the gas introduction device, and the exhaust device is used to exhaust the gas, and the vacuum degree in the reactor is controlled by the vacuum device 400.

[0048] The preparation system of the embodiment of the present invention can increase the heating area of ​​rosin by crushing and sieving the rosin first, and reduce the resistance when stirring the reactor, making it easy to stir, and the rosin is heated evenly, greatly shortening the melting time. 3 The first reactor is used for heating. For example, 3 tons of rosin are added. 0.5MPa steam is used for heating. It takes 10-12 hours for the large pieces of rosin that are not normally processed to melt because they cannot be stirred. However, it only takes 3-4 hours for the rosin that has been crushed by the preparation system to melt. The rosin polyoxyethylene ether oligomer and the crushed rosin are added to the second reactor at a ratio of 1:0.5-1.5 as the starting materials. Since the rosin polyoxyethylene ether oligomer is liquid, mixing with the rosin can increase the lubrication and fluidity of the rosin surface, which is more conducive to uniform stirring. When heating and melting the rosin, the heat exchange area is increased, the heating is uniform, the melting speed is accelerated, and the product color is dark due to severe local heating. According to 12m 3 For example, if 2 tons of rosin and 1.3 tons of rosin polyoxyethylene ether oligomer mixture are added to the kettle, it only takes 1.5-2 hours to melt, while the normal 12m 3 The kettle was filled with 2 tons of uncrushed rosin. Since it could not be stirred, it took 7-9 hours to melt, which greatly shortened the melting time.

[0049] Under high temperature conditions, the C=C double bond and CC single bond in the structure of rosin will be oxidized and broken to generate aldehydes and ketones, which will become byproducts such as aldehydes and ketones of different molecular weights; and under high temperature, some aldehydes and ketones will undergo acetal or ketal reactions to generate substances of different molecular weights. Aldehydes and ketones and acetal ketal substances of different molecular weights in the raw materials react with ethylene oxide together, resulting in a wide molecular weight distribution of the product and a dark color. The preparation system of the embodiment of the present invention can greatly shorten the melting time of rosin, reduce the probability of rosin oxidation to produce aldehydes, ketones and acetal ketal byproducts, and then the rosin polyoxyethylene ether product synthesized by reacting with ethylene oxide has a narrow molecular weight distribution and a light color, and the product quality is greatly improved.

[0050] The embodiment of the present invention also provides a method for preparing rosin polyoxyethylene ether, which is prepared by using the above preparation system.

[0051] Preparation of the reactor before preparation: first clean the preparation system, purge and dry it until it is clean and dry; dry each reactor, cool it to room temperature and set it aside. The following examples illustrate the present invention, but are not intended to limit the scope of the present invention. The molecular weight mentioned in the embodiments and comparative examples is Mn (number average molecular weight, measured by gel permeation chromatography GPC), and the molecular weight distribution coefficient D (measured by gel permeation chromatography GPC).

[0052] Example 1

[0053] Preparation of rosin polyoxyethylene ether oligomers, the steps are as follows:

[0054] 3000kg of hydrogenated rosin is crushed by a pulverizer and then put into a 12m 3 In the first reactor, add 4kg of catalyst KOH and close the feeding gate valve. After evacuating the vacuum in the reactor to -0.098Mpa, close the vacuum, fill with N2 until the pressure in the reactor is 0.02MPa, evacuate to ≥-0.098MPa, start stirring, and heat the material at the same time (control the heating steam to 0.5MPa). After the temperature rises to 115°C, vacuum ≥-0.098MPa for dehydration for 1h. After dehydration, close the vacuum valve, heat to 130°C, and continue to introduce quantitative ethylene oxide for reaction. The reaction temperature is controlled at 150°C, and the reaction is controlled at ≤0.35 pressure. After the reaction is completed, cool to 60°C to obtain rosin polyoxyethylene ether oligomers.

[0055] Embodiment 2-4

[0056] The process conditions of Example 1 remain unchanged, and the amount of raw materials, ethylene oxide, and the type and amount of catalyst are adjusted. The raw materials used and the test results are shown in Table 1.

[0057] Table 1

[0058]

[0059] Example 5

[0060] Preparation of rosin polyoxyethylene ether, the steps are as follows:

[0061] 2000 kg of hydrogenated rosin and 1300 kg of rosin polyoxyethylene ether oligomer obtained in Example 1 were put into the second reaction kettle through the preparation system of the present invention. The hydrogenated rosin was first crushed by a pulverizer and then put into 12 m 3 In the second reactor, add 7.6kg of catalyst KOH, close the feeding gate valve, and then press 1300kg of rosin polyoxyethylene ether oligomer obtained in Example 1 into the second reactor from the bottom pipeline of the first reactor. After evacuating the vacuum in the reactor to -0.098Mpa, close the vacuum, fill N2 to the pressure in the reactor to 0.02MPa, and then evacuate to ≥-0.098MPa, start stirring, and heat the material at the same time (control the heating steam 0.5MPa). After the temperature rises to 115°C, vacuum ≥-0.098Mpa for dehydration for 1h. After dehydration, close the vacuum valve, heat to 130°C, and continue to introduce 5658kg of ethylene oxide for reaction. The reaction temperature is controlled at 150°C, and the reaction is controlled at ≤0.35 pressure. After the reaction is completed, cool to 60°C to discharging to obtain the rosin polyoxyethylene ether finished product.

[0062] Embodiment 6-8

[0063] The process conditions of Example 5 remain unchanged, and the amounts of raw materials, catalyst and ethylene oxide are adjusted. The raw materials used and the test results are shown in Table 2.

[0064] Table 2

[0065]

[0066]

[0067] Comparative Examples 1-4: Synthesis was performed according to the previously reported method.

[0068] Comparative Example 1

[0069] A method for preparing rosin polyoxyethylene ether comprises the following steps:

[0070] 3000kg of un-crushed hydrogenated rosin was added into the stirring vessel for 12 minutes. 3The reactor was added with 9.5kg of KOH catalyst, and the feeding gate valve was closed. The vacuum was evacuated until the vacuum in the reactor reached -0.098Mpa, and then the vacuum was closed. N2 was filled until the pressure in the reactor reached 0.02MPa, and then the vacuum was evacuated to ≥-0.098MPa. At the same time, the temperature was raised to 0.5MPa (heating steam was controlled). When the stirring could be started, the stirring was started. After the temperature was raised to 115°C, the vacuum was ≥-0.098Mpa and dehydrated for 1h. After the dehydration was completed, the vacuum valve was closed, and after the temperature was raised to 130°C, 6492kg of ethylene oxide was continuously introduced for reaction. The normal reaction temperature was controlled at 150°C, and the reaction was controlled at ≤0.35 pressure. After the reaction was completed, the temperature was lowered to 60°C and the material was discharged to obtain the finished rosin polyoxyethylene ether.

[0071] Comparative Examples 2-4

[0072] The process conditions of Comparative Example 1 remain unchanged, and the amount of raw materials, ethylene oxide, and the type and amount of catalyst are adjusted. The raw materials used and the test results are shown in Table 3.

[0073] Table 3

[0074]

[0075] It can be seen from Table 1 and Table 3 that both Examples 1-4 and Comparative Examples 1-2 use 3000 kg of rosin and are also melted by heating with 0.5 MPa steam. The melting time of the examples is 3.5-3.8 h, while the melting time of Comparative Example 1-2 is 11.2 h. The melting time of Example 1-4 is only 1 / 3 of that of the Comparative Example.

[0076] As shown in Table 2 and Table 3, both Examples 5-6 and Comparative Example 3 use 2000 kg of rosin, and the melting time of Examples 5-6 is only 1.8 hours, which is less than a quarter of the 8.4 hours of Comparative Example 3. It can be seen that the preparation system and method of this patent can greatly shorten the rosin melting time and shorten the product production cycle.

[0077] Emulsification performance test: The samples prepared in the examples and comparative examples were configured into 1% aqueous solutions. 25 mL of the 1% aqueous solution was placed in a 100 mL stoppered measuring cylinder and oscillated with 20 mL of 5# white oil. The mixture was shaken up and down 30 times and allowed to stand. The time taken to separate 10 mL of water was recorded. The results are shown in Table 4.

[0078] Table 4

[0079]

[0080]

[0081] As shown in Table 2, Table 3 and Table 4, the product examples 5-8 produced by the preparation method of this patent are compared with the existing one-step base catalysis method comparative examples 1-4 of un-crushed rosin. When the catalyst alkalinity, reaction temperature and theoretical molecular weight of the feed are consistent, the product prepared by the present invention has a narrow molecular weight distribution, light color appearance, good product emulsification performance and more stable emulsification. Under high temperature conditions, the C=C double bond and CC single bond in the structure of rosin will be oxidized and broken to generate aldehydes and ketones, and become by-products such as aldehydes and ketones of different molecular weights; and at high temperature, acetal or ketal reactions occur between some aldehydes and ketones to generate substances of different molecular weights. Aldehydes and ketones and acetal ketal substances of different molecular weights in the raw materials react with ethylene oxide together, resulting in a wide molecular weight distribution of the product and a deep color. The greatly shortened rosin melting time can greatly reduce the probability of rosin oxidation to produce aldehydes, ketones and acetal ketal by-products, and then the rosin polyoxyethylene ether product synthesized by reaction with ethylene oxide has a narrow molecular weight distribution and light color, and the product quality is greatly improved.

[0082] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A system for preparing rosin polyoxyethylene ether, characterized in that: include: An oligomer preparation system (100) is provided, the oligomer preparation system (100) comprising a first crushing device (110), a first screen device (120), a first conveying device (130) and a first reactor (140); a discharge port A of the first crushing device (110) is located above the first screen device (120), and materials enter the first screen device (120) through the discharge port A; a material receiving port of the first conveying device (130) is located below the first screen device (120) and is connected to a feed port of the first reactor (140), and is used for collecting screened materials and conveying them to the first reactor (140); A polyether preparation system (200), the polyether preparation system (200) comprising a second crushing device (210), a second screen device (220), a second conveying device (230) and a second reactor (240); a discharge port B of the second crushing device (210) is located above the second screen device (220), and materials enter the second screen device (220) through the discharge port B; a receiving port of the second conveying device (230) is located below the second screen device (220) and is connected to a feed port of the second reactor (140), and is used to collect screened materials and convey them to the second reactor (240); A third conveying device (300), wherein the third conveying device (300) is connected to the first reaction kettle (140) and the second reaction kettle (240) and is used for conveying oligomers.

2. The preparation system according to claim 1, characterized in that: The first reaction kettle (140) and the second reaction kettle (240) are both provided with a gas introduction device and an exhaust device.

3. The preparation system according to claim 1, characterized in that: The first reaction kettle (140) and the second reaction kettle (240) are also provided with a vacuum pumping device (400).

4. A method for preparing rosin polyoxyethylene ether, characterized in that: The preparation is carried out using the preparation system according to any one of claims 1 to 3, comprising the following steps: (1) crushing and sieving a portion of rosin, mixing with catalyst A, and dehydrating; then heating, continuously introducing ethylene oxide to react, and obtaining rosin polyoxyethylene ether oligomers; (2) crushing and sieving another portion of rosin, adding it to the rosin polyoxyethylene ether oligomer prepared in step (1), and adding catalyst B, dehydrating; then heating, continuously introducing ethylene oxide to react, and obtaining rosin polyoxyethylene ether.

5. The preparation method according to claim 4, characterized in that: The rosin includes one of hydrogenated rosin, rosin acid or disproportionated rosin.

6. The preparation method according to claim 4, characterized in that: In step (1), the weight ratio of the portion of rosin to the ethylene oxide is 1:(0.25-0.72).

7. The preparation method according to claim 5 or 6, characterized in that: The catalyst A in step (1) and the catalyst B in step (2) are independently selected from at least one of potassium hydroxide, sodium hydroxide, potassium methoxide and sodium methoxide.

8. The preparation method according to claim 7, characterized in that: The amount of the catalyst A used is 0.03%-0.2% of the total weight of the rosin and the ethylene oxide in step (1); the amount of the catalyst B used is 0.03%-0.2% of the total weight of the rosin and the ethylene oxide in step (2).

9. The preparation method according to claim 4, characterized in that: In step (2), the weight ratio of the rosin polyoxyethylene ether oligomer to the other part of rosin and the ethylene oxide is 1:(0.5-1.5):(1.0-10.0).

10. The preparation method according to claim 4, characterized in that: The sieving process in step (1) and step (2) is as follows: sieving through a sieve with a mesh diameter of 0.2-0.5 cm.

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