Preparation system of low-odor polyether

Abstract

The utility model relates to the technical field of polyether synthesis equipment, and discloses a preparation system of low-odor polyether. The preparation system comprises a reaction kettle, a post-treatment kettle, a smell removal kettle, a steam generator and a water storage device. Wherein the odor removal kettle comprises a second outer circulating pipe, a mixer and an atomizer, the mixer is directly connected with the atomizer, and the steam outlet pipe and the second outer circulating pipe are both communicated with the mixer on the odor removal kettle; the water storage device comprises a nitrogen inlet pipe and a gas distributor; the gas distributor is located in the water storage device, connected with the nitrogen inlet pipe and used for dispersing nitrogen. The low-odor polyether can be prepared by adopting the preparation system of the low-odor polyether, the content of formaldehyde, the content of acetaldehyde, the content of acrolein and the content of acetone are respectively lower than 1ppm, and the odor grade of the low-odor polyether is below 1.5; and the preparation system is simple, and the odor removal time can be greatly shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to polyether synthetic equipment technical field, concretely relates to a preparation system of low odor polyether. BACKGROUND

[0002] In recent years with the continuous improvement of environmental protection concept, how to effectively improve the increasingly complex in-car quality link, give the consumer a healthy ride environment, has become the urgent problem that each automobile enterprise needs to solve. Therefore the customer is more and more concerned about the smell of polyether, in the polyether polyol synthesis technology, strive to improve product quality, meet the environmental protection demand. At present, more automobile seat cushion adopts high resilience PU foam. In recent years, the automobile industry develops rapidly, plus the rapid development of civil aviation and high-speed rail, it is urgent to develop and produce both comfortable and safe high resilience PU foam seat cushion.

[0003] Domestic and foreign major production enterprises and research institutions have also done a lot of work around polyether polyol synthesis equipment and preparation system. Such as technology through the way of combining the bubble bed reactor and ceramic membrane separator, and adding hydrogenation catalyst in the ceramic membrane separator, in the hydrogen gas reaction preparation low odor polyether. But this method needs complex refining equipment, and the preparation of supported catalyst is difficult and expensive, and hydrogenation reaction needs to be carried out under superhigh pressure and high temperature, which requires high equipment. There is also a technology that uses packed column stripping to purify polymer polyol, but for polymer polyol, pop particles or residual monomers are prone to fouling on the inner surface of the column under heat conditions, even blocking the pipeline, thereby affecting the heat transfer efficiency and removal effect, and increasing the difficulty of operation and treatment equipment. There is also a technology that discloses that the product is removed through a multi-stage thin film evaporator and a multi-stage removal tank, and inert gas is introduced under high vacuum state to remove the vaporized ethylene monomer, solvent and other small molecular substances. There is also a technology that uses plug bottom distribution pipe nitrogen bubbling and medium pressure steam bubbling to remove water and aldehyde compounds in polyether polyol, and controls the pressure to-0.075 to-0.085Mpa to prepare low odor polyether polyol. This method needs to consume a large amount of nitrogen, and the steam does not contact the stream sufficiently, so that it needs longer time to remove low odor substances such as aldehyde and ketone.

[0004] Therefore, it is urgent to provide a preparation system for preparing low odor polyether, which can shorten the time of odor removal step and efficiently and simply prepare low odor polyether. UTILITY MODEL CONTENT

[0005] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a preparation system of low odor polyether, which can shorten the time of odor removal step and efficiently and simply prepare low odor polyether.

[0006] To solve the above problems, the technical scheme adopted by the utility model is as follows:

[0007] A system for preparing low odor polyether, comprising:

[0008] A reactor for preparing polyether crude, which comprises a material feeding pipe and a polyether crude discharging pipe;

[0009] A post-treatment reactor, the feeding port of which is connected with the polyether crude discharging pipe, and the post-treatment reactor comprises a refined polyether discharging pipe;

[0010] An odor removal reactor, the feeding port of which is connected with the refined polyether discharging pipe, and the odor removal reactor comprises a mixer, an atomizer, a second external circulation pipe and a product discharging port, the mixer is directly connected with the atomizer, the product discharging port is arranged at the bottom of the odor removal reactor, one end of the second external circulation pipe is connected with the product discharging port, and the other end is connected with the top of the odor removal reactor;

[0011] A steam generator, which comprises a steam discharging pipe and a first water feeding pipe, and the steam discharging pipe and the second external circulation pipe are both connected with the mixer of the odor removal reactor;

[0012] A water storage device, which comprises a second water feeding pipe, a vacuum pipe, a nitrogen gas feeding pipe and a gas distributor, the gas distributor is arranged inside the water storage device and connected with the nitrogen gas feeding pipe for dispersing nitrogen gas.

[0013] The system for preparing low odor polyether as described above, wherein the reactor further comprises a heat exchange device for controlling the temperature of the reactor.

[0014] The system for preparing low odor polyether as described above, wherein a filter device is arranged on the refined polyether discharging pipe of the post-treatment reactor for removing solid matters such as catalysts and adsorbents from the refined polyether.

[0015] The system for preparing low odor polyether as described above, wherein a first external circulation pipe is arranged on the refined polyether discharging pipe of the post-treatment reactor, and the first external circulation pipe is connected with the top of the post-treatment reactor. When the post-treatment of polyether does not meet the requirements, the polyether is re-fed to the post-treatment reactor through the first external circulation pipe for treatment.

[0016] The system for preparing low odor polyether as described above, wherein a plurality of atomizing nozzles are arranged on the atomizer.

[0017] The low-odor polyether preparation system, when the steam outlet pipe and the second outer circulation pipe are communicated with the mixer on the odor removal kettle, the pipe openings of the steam outlet pipe and the second outer circulation pipe are both bevel openings, and the bevel openings of the two are oppositely arranged. The steam entering through the oppositely arranged bevel openings is mixed with the preheated refined polyether in the mixer, so that the steam and the refined polyether can be more fully mixed and contacted, and the subsequent steam can better carry away the aldehyde and ketone odor substances.

[0018] The low-odor polyether preparation system, the bevel opening comprises a bevel plate and a hole arranged on the bevel plate, the diameter of the hole is 0.5-1.5 mm, and the number of the holes is 35-100 per cm 2 .

[0019] The low-odor polyether preparation system, the gas distributor is located at the bottom of the water storage device. The nitrogen gas dispersed through the gas distributor enters the water from the bottom of the water storage device, can be fully contacted with the water, and can more thoroughly carry away the air dissolved in the water under the vacuum action of the vacuum pipe, so that the water entering the subsequent steam generator does not contain air, and then the air mixed in the steam is avoided, and the polyether is oxidized to form the by-product aldehyde and ketone odor substances when entering the odor removal kettle.

[0020] The low-odor polyether preparation system, the gas distributor is a ring-shaped gas distributor; the ring-shaped gas distributor is a circular ring pipe provided with a plurality of small holes, the diameter of the small holes is 0.5-1.5 mm, and the distribution amount of the small holes is 25-50 per m.

[0021] Compared with the prior art, the low-odor polyether preparation system has the following beneficial effects:

[0022] (1) The low-odor polyether preparation system comprises a reaction kettle, a post-treatment kettle, an odor removal kettle, a steam generator and a water storage device. The reactant is reacted in the reaction kettle to obtain polyether crude product, and the polyether crude product is treated in the post-treatment kettle to obtain refined polyether. The water storage device prepares water containing no air, and then the steam generator prepares steam containing no air. The preheated refined polyether and the steam enter the odor removal kettle through the second outer circulation pipe at the same time, and the mixer and the atomizer are arranged in the odor removal kettle, so that the small molecule aldehyde and ketone substances in the polyether are removed through the vacuum pumping mode, and the purpose of reducing the odor of the polyether is achieved.

[0023] (2) The low-odor polyether preparation system can prepare low-odor polyether, the content of formaldehyde, acetaldehyde, propylene aldehyde and acetone is less than 1 ppm, the odor grade is less than 1.5, the preparation system is simple, and the odor removal time can be greatly shortened.

[0024] The utility model will be further explained in detail in connection with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The schematic diagram of the preparation system of low odor polyether provided by the embodiment of the utility model;

[0026] Figure 2 For Figure 1 The enlarged view of the section of area A;

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 100-reaction kettle, 110-material feeding pipe, 120-polyether crude product discharging pipe, 130-heat exchange device;

[0029] 200-post-treatment kettle, 210-refined polyether discharging pipe, 220-filtering device, 230-first external circulation pipe;

[0030] 300-odor removal kettle, 310-mixer, 320-atomizer, 321-atomizing nozzle, 330-finished product discharging port, second external circulation pipe-340;

[0031] 400-steam generator, 410-steam outlet pipe, 420-first water inlet pipe;

[0032] 500-water storage device, 510-gas distributor, 520-second water inlet pipe, 530-vacuum pipe, 540-nitrogen inlet pipe. DETAILED DESCRIPTION

[0033] The embodiments of the utility model will be described in detail below, referring to Figures 1 to 2 The embodiments of the utility model provide a preparation system of low odor polyether, comprising:

[0034] Reaction kettle 100, reaction kettle 100 is used for preparing polyether crude product, and it comprises material feeding pipe 110 and polyether crude product discharging pipe 120;It can be understood that material feeding pipe 110 is connected with the feeding port of reaction kettle 100, and polyether crude product discharging pipe 120 is connected with the discharging port at the bottom of reaction kettle 100.Alcohol initiator, catalyst and epoxide enter reaction kettle 100 through material feeding pipe 110, and solid catalyst can be directly put into reaction kettle 100.In some embodiments of the utility model, reaction kettle 100 further comprises heat exchange device 130, heat exchange device 130 is used in cooperation with external circulation pipe and circulating pump to control the temperature of reaction kettle 100, realizes the heating and cooling of reaction material and the like.Further, reaction kettle 100 is further provided with conventional inert gas (such as nitrogen) inlet pipe, vacuum pipe, pressure gauge, thermometer and the like, and material stirring device can also be arranged in reaction kettle 100.

[0035] The post-treatment kettle 200 is connected with the polyether crude product outlet pipe 120 at its inlet, and includes a refined polyether outlet pipe 210 connected with the outlet of the post-treatment kettle 200. Further, a filtering device 220 is arranged on the refined polyether outlet pipe 210 of the post-treatment kettle 200, for removing solid matters such as catalysts and adsorbents from the refined polyether. One or more circulating pumps can be installed or arranged on the refined polyether outlet pipe 210 as needed. In some embodiments of the present application, a first external circulating pipe 230 is arranged on the refined polyether outlet pipe 210 of the post-treatment kettle 200, and is connected with the top end of the post-treatment kettle 200. In the initial stage of the filtering device treatment, the quality of the polyether outlet is unstable, and when the polyether post-treatment does not meet the requirements, it is re-transported to the post-treatment kettle 200 for treatment through the first external circulating pipe 230. In addition, the post-treatment kettle 200 can also be provided with a conventional inert gas (such as nitrogen) inlet pipe, a vacuum pipe, a pressure gauge, a thermometer, etc. according to actual needs, and the post-treatment kettle 200 is also provided with a material stirring device inside.

[0036] The odor removal kettle 300 is connected with the refined polyether outlet pipe 210 at its inlet, and includes a mixer 310, an atomizer 320, a second external circulating pipe 340 and a finished product outlet 330. The mixer 310 is directly connected with the atomizer 320, and the finished product outlet 330 is arranged at the bottom of the kettle. The second external circulating pipe 340 is connected with one end of the finished product outlet 330 and the other end of the kettle top of the odor removal kettle 300. The steam generator 400 includes a steam outlet pipe 410 and a first water inlet pipe 420, and the steam outlet pipe 410 and the second external circulating pipe 340 are both connected with the mixer 310 on the odor removal kettle 300. Further, as shown in Figure 2 The steam outlet pipe 410 and the second external circulating pipe 340 are both inclined pipes, and the inclined pipes of the two are oppositely arranged. The inclined pipe includes an inclined plate and a hole arranged on the inclined plate, wherein the diameter of the hole is 0.5-1.5mm, and the number of the holes is 35-100 / cm 2The steam and the preheated refined polyether enter the mixer through the holes of the inclined port. The steam and the preheated refined polyether that enter the mixer through the relatively arranged inclined ports can be more fully mixed and contacted, and the steam can better carry away the aldehyde ketone odor substances. Specifically, the polyether treated by the post-treatment kettle 200 enters the deodorization kettle 300 through the refined polyether discharge pipe 210, is preheated, and then enters the mixer 310 through the second outer circulation pipe 340 and the steam input through the steam outlet pipe 410, and is atomized by the atomizer 320 and then reenters the deodorization kettle 300 for deodorization treatment. In some embodiments of the present application, as shown in Figure 2 The atomizer 320 is provided with a plurality of atomizing nozzles 321, and the distance between the atomizing nozzles 321 is 5-30 cm, for example, 20 cm. It should be understood that the deodorization kettle 300 can also be provided with a conventional inert gas (such as nitrogen) inlet pipe, a vacuum pipe, a pressure gauge, a thermometer, etc. according to actual needs.

[0037] The water storage device 500 includes a second water inlet pipe 520, a vacuum pipe 530, a nitrogen gas inlet pipe 540, and a gas distributor 510. The gas distributor 510 is located in the interior of the water storage device 500 and is connected to the nitrogen gas inlet pipe 540 and is used for dispersing nitrogen gas. Further, the gas distributor 510 is located at the bottom of the water storage device 500. The nitrogen gas dispersed by the gas distributor 510 enters the water from the bottom of the water storage device 500 and can fully contact with the water (generally deionized water). Under the vacuum action of the vacuum pipe 530, the air dissolved in the water can be more thoroughly carried away, so that the water entering the steam generator 400 in the subsequent process does not contain air, thereby avoiding that the steam prepared by the steam generator 400 contains air and that the polyether is oxidized to form by-product aldehyde ketone odor substances when entering the deodorization kettle 300. In some embodiments of the present application, the gas distributor 510 is a ring-shaped gas distributor, and the ring-shaped gas distributor is a circular ring pipe provided with a plurality of small holes. The diameter of the small holes is 0.5-1.5 mm, and the distribution amount of the small holes is 25-50 / m.

[0038] When the low odor polyether is prepared by using the preparation system, the alcohol initiator and the catalyst are first put into the reaction kettle 100, the air in the reaction kettle 100 is replaced by nitrogen, then the reaction kettle 100 is heated by using the heat exchange device 130, the epoxide is introduced into the reaction kettle 100 through the material feeding pipe 110 to react, and the crude polyether is prepared. The crude polyether is introduced into the post-treatment kettle 200 through the crude polyether discharging pipe 120, the acid liquid and the adsorbent are added into the post-treatment kettle 200, the post-treatment is carried out, and the refined polyether is obtained. The refined polyether is discharged from the refined polyether discharging pipe 210, and after the adsorbent and other solid substances are removed through the filter device 220, the refined polyether is introduced into the odor removal kettle 300. The refined polyether is preheated in the odor removal kettle 300, and then is introduced into the mixer 310 through the second outer circulation pipe 340 together with the steam containing no air which is introduced into the mixer 310 through the steam discharging pipe 410, and is atomized by the atomizer 320 connected with the mixer 310, and then is introduced into the odor removal kettle 300 again to carry out the odor removal treatment. The steam containing no air is prepared by using the steam generator 400, and the steam and the refined polyether are introduced into the mixer 310 through the second outer circulation pipe 340 with the inclined pipe opening and the refined polyether discharging pipe 210 respectively, are fully mixed, and then are atomized by the atomizer 320 and are introduced into the odor removal kettle 300. Finally, the steam carries the aldehyde and ketone odor substances in the material away through vacuum pumping, and the low odor polyether is obtained.

[0039] In order to ensure that the steam containing no air is obtained, the deionized water for preparing the steam is treated by using the water storage device 500, the nitrogen is dispersed by using the gas distributor 510, and then is introduced into the water from the bottom of the water storage device 500, fully contacts with the deionized water, and then is completely taken away by using the vacuum effect of the vacuum pipe 530, so that the deionized water for preparing the steam contains no air.

[0040] The preparation system for preparing the low odor polyether can prepare the low odor polyether, the content of formaldehyde, acetaldehyde, propylene aldehyde and acetone is less than 1 ppm, the odor grade is less than 1.5, the preparation system is simple, and the odor removal step time is short.

[0041] It should be noted that, in the description of the utility model, if there is a direction description, for example, the direction or position relationship indicated by the upper, lower, front, rear, left and right is based on the direction or position relationship shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as a limitation on the utility model.

[0042] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is two and above, greater than, less than, exceed and the like are understood as not including the number, above, below, within and the like are understood as including the number. If there is a description of first or second and the like, it is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0043] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection and the like should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0044] The above-mentioned embodiments are only preferred embodiments of the utility model, which cannot be used to limit the range of protection of the utility model, and any non-substantial changes and replacements made by the person skilled in the art on the basis of the utility model all belong to the range of protection required by the utility model.

Claims

1. A system for the production of low odor polyether, characterized in that, The application relates to a polyether production device, which comprises the following parts: a reaction kettle (100) comprising a material feeding pipe (110) and a polyether crude product discharging pipe (120); a post-treatment kettle (200) connected with the polyether crude product discharging pipe (120) and comprising a refined polyether discharging pipe (210); an odor removal kettle (300) connected with the refined polyether discharging pipe (210) and comprising a mixer (310), an atomizer (320), a second external circulation pipe (340) and a product discharging port (330), wherein the mixer (310) is directly connected with the atomizer (320), the product discharging port (330) is arranged at the bottom of the odor removal kettle (300), one end of the second external circulation pipe (340) is connected with the product discharging port (330), and the other end is connected with the top of the odor removal kettle (300); a steam generator (400) comprising a steam discharging pipe (410) and a first water feeding pipe (420), wherein the steam discharging pipe (410) and the second external circulation pipe (340) are both connected with the mixer (310) of the odor removal kettle (300); a water storage device (500) comprising a second water feeding pipe (520), a vacuum pipe (530), a nitrogen gas feeding pipe (540) and a gas distributor (510), wherein the gas distributor (510) is arranged in the water storage device (500) and connected with the nitrogen gas feeding pipe (540) and used for dispersing nitrogen gas.

2. A system for the preparation of a low odor polyether according to claim 1, characterized in that, The reaction kettle (100) further comprises a heat exchange device (130) used for controlling the temperature of the reaction kettle (100).

3. The system for preparing a low odor polyether of claim 1, wherein, The refined polyether discharging pipe (210) of the post-treatment kettle (200) is further provided with a filtering device (220) used for removing solid matters in the refined polyether.

4. The system for preparing a low odor polyether according to claim 3, wherein The refined polyether discharging pipe (210) of the post-treatment kettle (200) is further provided with a first external circulation pipe (230) connected with the top of the post-treatment kettle (200).

5. The system for preparing a low odor polyether of claim 1, wherein, The atomizer (320) is provided with a plurality of atomizing nozzles (321).

6. The system for preparing a low odor polyether of claim 1, wherein, When the steam discharging pipe (410) and the second external circulation pipe (340) are both connected with the mixer (310) of the odor removal kettle (300), the pipe openings of the steam discharging pipe (410) and the second external circulation pipe (340) are both inclined surfaces, and the inclined surfaces of the two pipes are oppositely arranged.

7. A system for the preparation of a low odor polyether according to claim 6, characterized in that, The bevel port comprises a bevel plate and holes arranged on the bevel plate, the diameter of the holes is 0.5-1.5mm, and the number of the holes is 35-100 / cm 2 .

8. The system for preparing a low odor polyether of claim 1, wherein, The gas distributor (510) is arranged at the bottom of the water storage device (500).

9. A system for the preparation of a low odor polyether according to claim 8, characterized in that, The gas distributor (510) is a ring-shaped gas distributor.

10. A system for the preparation of a low odor polyether according to claim 9, characterized in that, The ring-shaped gas distributor is a circular ring pipe provided with a plurality of small holes, the diameters of the small holes are 0.5-1.5 mm, and the distribution amount of the small holes is 25-50 / m.

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