CN216236781U - Glycine preparation serialization device with clear stifled function of recoil - Google Patents
Glycine preparation serialization device with clear stifled function of recoil Download PDFInfo
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- CN216236781U CN216236781U CN202122837664.1U CN202122837664U CN216236781U CN 216236781 U CN216236781 U CN 216236781U CN 202122837664 U CN202122837664 U CN 202122837664U CN 216236781 U CN216236781 U CN 216236781U
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Abstract
The utility model discloses a glycine preparation continuous device with a back-flushing blockage removing function, which comprises a preheating unit, one or more than one reaction-back-flushing unit, a gas-liquid separator, a flash tower and a crystallization evaporator which are sequentially connected in series through pipelines, wherein the preheating unit is provided with a raw material feeding hole, and the crystallization evaporator is provided with a product discharging hole. The utility model realizes the continuous production of the glycine synthesis process by using the hydroxy acetonitrile, and the process is environment-friendly; the content of impurities such as iron in the product is reduced, and the quality of the product is improved; the blockage of a system pipeline caused by impurities generated by corrosion of a reaction liquid on materials is reduced, the safety risk of spraying and discharging of the system due to blockage is greatly reduced, and the safety is improved; the device has the advantages of reducing equipment investment for device industrialization, indirectly reducing production cost and improving market competitiveness of products.
Description
Technical Field
The utility model relates to the technical field of preparation of glycine, in particular to a glycine preparation continuous device with a back-flushing and blockage-removing function.
Background
Glycine (Glycine), also known as Glycine, is one of the non-essential amino acids of the human body, and is an alpha amino acid with the smallest relative molecular mass and with the simplest molecular structure. The glycine is an important fine chemical intermediate, and the application field of the glycine is wide, and the glycine comprises multiple industries such as pesticides, medicines, foods, animal feeds and daily chemicals. The research on the synthesis technology of glycine is highly important at home and abroad, and various process routes are developed, including chloroacetic acid ammonolysis, Strecker (Scherrer's method) which realize industrial large-scale production, and green processes in development: hydantion method (hydantoin method), biochemical synthesis method, and the like.
The chloroacetic acid ammonolysis process is eliminated by the main glycine production enterprises in foreign countries, but the method is mainly adopted by the manufacturers in China. The advantages of the Scherrk method are that the obtained glycine has good quality, the subsequent refining of the product is easy, and the method is suitable for industrial large-scale production, but one of the used raw materials is highly toxic chemical sodium cyanide, and the operation safety risk is high. In order to further improve the quality of glycine products and improve the market competitiveness of the products, so that the process is more environment-friendly, foreign research institutes successfully develop an improved Scherrer process which takes hydrocyanic acid to replace sodium cyanide as a raw material on the basis of the original Scherrer process, and the process has the advantages of few synthesis procedures, high product yield, low production cost and environmental friendliness. However, hydrocyanic acid is toxic and volatile, and is inconvenient to transport for a long distance, so that hydrocyanic acid is suitable for production near a raw material production or storage place. At present, the process is adopted by major glycine production enterprises abroad, such as Chatem company in the United states, Spanisia company in France and the like. The main raw material hydrocyanic acid of the improved Strecker method is a highly toxic chemical, is volatile and difficult to store, and a production process for preparing glycine by a Hydantion method (hydantoin method) is developed in the process of finding a substitute of the improved Strecker method. Firstly, hydrocyanic acid and formaldehyde are utilized to synthesize hydroxyl acetonitrile with better stability, then the hydroxyl acetonitrile, a carbon source and an ammonia source are utilized to synthesize hydantoin under certain temperature and pressure conditions, and finally, the hydantoin is obtained after hydrolysis under high temperature and high pressure conditions. The process has the characteristics of high atom utilization rate, high product quality, cleanness, environmental protection and the like, and has wide market application prospect, but the process only realizes batch kettle type production in industry at present, and industrial continuous production is not realized. Meanwhile, the reaction time of the kettle reactor is long, and the back mixing phenomenon exists.
Chinese utility model patent ZL 201821604809.5 discloses a tubular reaction unit around of serialization preparation glycine, hydroxyl acetonitrile and ammonia source, carbon source, water etc. preheat the back through preheating the system earlier, synthesize in proper order and hydrolysis reaction through the tubular reaction unit again, then obtain glycine after distilling, crystallization, separation, drying through gas-liquid separation unit, flash distillation unit and crystallization unit. The utility model discloses a chinese utility model patent ZL 201821604801.9 also discloses a coiled tube reaction unit of hydroxyacetonitrile serialization preparation glycine, preheat the system with raw materials hydroxyacetonitrile, the ammonia source, after preheating to the uniform temperature, synthetic and hydrolysis are accomplished in proper order to reaction liquid again through coil reaction unit, utilize the gas-liquid separation unit afterwards, flash distillation unit and crystallization unit distill, the crystallization, the separation, it is dry, obtain product glycine at last, when its reaction unit adopts conventional material, easily be corroded by reaction liquid, lead to follow-up product refining technology degree of difficulty to increase, pipeline easily blocks up in the product synthesis process, lead to appearing the superpressure raw materials of system and the phenomenon is blown off with reaction liquid, there is higher potential safety hazard. The adoption of corrosion-resistant materials greatly increases the production cost and is not beneficial to industrialization.
In view of the foregoing, there is a need for a continuous production apparatus capable of producing high-quality glycine.
SUMMERY OF THE UTILITY MODEL
The technical problems to be solved by the utility model are that the existing glycine synthesis process does not realize continuous production, main reaction units are easily corroded by reaction liquid, the difficulty of the subsequent product refining process is increased, the product quality is not high, pipelines are easily blocked in the product synthesis process, the phenomena of overpressure raw materials and reaction liquid spraying and leakage of a system caused by overhigh system pressure exist, the potential safety hazard is large, and the experimental operation has certain risks.
In order to solve the technical problems, the technical scheme adopted by the utility model is to provide a continuous glycine preparation device with a backflushing and blockage removing function, which comprises a preheating unit, one or more than one reaction-backflushing unit, a gas-liquid separator, a flash tower and a crystallization evaporator which are sequentially connected in series through pipelines, wherein the preheating unit is provided with a raw material feeding hole, a discharging hole of the preheating unit is connected with a feeding hole of the reaction-backflushing unit, a discharging hole of the reaction-backflushing unit is connected with a feeding hole of the gas-liquid separator, a discharging hole of the gas-liquid separator is connected with a feeding hole of the flash tower, a discharging hole of the flash tower is connected with a feeding hole of the crystallization evaporator, and the crystallization evaporator is provided with a product discharging hole.
In the scheme, the number of the reaction-backflushing units is two, the reaction-backflushing units comprise a first reaction-backflushing unit and a second reaction-backflushing unit, the first reaction-backflushing unit comprises a first tubular reactor and a first electromagnetic backflushing device which are connected in series by the pipeline, the second reaction-backflushing unit comprises a second tubular reactor and a second electromagnetic backflushing device which are connected in series by the pipeline, the feed inlet of the first tubular reactor is connected with the discharge outlet of the preheating unit, the discharge outlet of the first tubular reactor is connected with the feed inlet of the first electromagnetic recoil device, the discharge hole of the first electromagnetic backflushing device is connected to the feed inlet of the second tubular reactor, the discharge hole of the second tubular reactor is connected to the feed inlet of the second electromagnetic backflushing device, and the discharge hole of the second electromagnetic backflushing device is connected to the feed inlet of the gas-liquid separator.
In the above scheme, the number of the first electromagnetic recoil devices is two, and the two first electromagnetic recoil devices are connected in parallel.
In the above scheme, the number of the second electromagnetic recoil devices is two, and the two second electromagnetic recoil devices are connected in parallel.
In the above scheme, the first electromagnetic recoil device and the second electromagnetic recoil device are respectively provided with a liquid discharge port.
In the above scheme, the preheating unit comprises a metering pump and a preheater which are connected in series by the pipeline, the raw material feed inlet is arranged on the preheater, and the discharge outlet of the preheater is connected to the feed inlet of the reaction-back flushing unit.
In the scheme, a back-pressure valve is also connected in series between the discharge hole of the reaction-back flushing unit and the feed inlet of the gas-liquid separator.
The utility model has the following beneficial effects:
1) the reaction liquid can effectively reduce impurities generated by corrosion of the reaction liquid on materials through the electromagnetic recoil device, and the product is easy to carry out aftertreatment.
2) The electromagnetic recoil device can wash and clean the system in a laboratory, so that smoothness of the system is guaranteed, pipeline blockage is reduced, raw material liquid leakage caused by rushing of the system is avoided, and operation safety is improved.
3) The reaction device is convenient to adopt materials with lower price, such as 316L stainless steel and the like, and the industrialized production cost is reduced.
Drawings
FIG. 1 is a schematic view of the profile connection of the present invention.
Detailed Description
The utility model is described in detail below with reference to the accompanying drawings.
The utility model discloses a continuous glycine preparation device with a back-flushing and blockage-removing function, which can be realized by appropriately improving process parameters by referring to the content in the text by a person skilled in the art. It is expressly intended that all such alterations and modifications which are obvious to those skilled in the art are deemed to be incorporated herein by reference, and that the techniques of the utility model may be practiced and applied by those skilled in the art without departing from the spirit, scope and range of equivalents of the utility model.
In the present application, unless otherwise specified, scientific and technical terms used herein have the meanings as commonly understood by one of ordinary skill in the art.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It should be noted that the terms "first" and "second" in the description of the present invention are used merely for convenience in describing different components, and are not to be construed as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Interpretation of terms:
1) glycine: also known as Glycine, the English name Glycine, is a non-essential amino acid with a chemical formula of C2H5NO2Molecular weight 75.07. Density: 1.254g/cm 3. The solid glycine is white to grey white crystal powder, and has no odor and no toxicity. It is easily soluble in water and hardly soluble in ethanol or diethyl ether. Is soluble in polar solvent, but insoluble in nonpolar solvent, and has high boiling point and melting point of 240 deg.C (decomposition).
2) Hydroxy acetonitrile: also known as Glycolonitrile, the English name Glycononitrile, chemical formula HOCH2CN, molecular weight 57.05, boiling point 183 deg.C, freezing point-72 deg.C, specific gravity 1.104, generally colorless oily liquid, hydrocyanic acid derivative, and simplest cyanohydrin.
As shown in figure 1, the continuous glycine preparation device with the back-flushing blockage removing function provided by the utility model comprises a preheating unit, one or more reaction-back-flushing units, a gas-liquid separator 8, a flash tower 9 and a crystallization evaporator 10 which are sequentially connected in series through pipelines, wherein a back-pressure valve 7 is also connected in series between a discharge port of the reaction-back-flushing unit and a feed port of the gas-liquid separator 8.
The preheating unit comprises a metering pump 1 and a preheater 2 which are connected in series through a pipeline, a raw material feeding hole is formed in the preheater 2, a discharging hole of the preheater 2 is connected to a feeding hole of the reaction-backwashing unit, a discharging hole of the reaction-backwashing unit is connected to a feeding hole of the gas-liquid separator 8, a discharging hole of the gas-liquid separator 8 is connected to a feeding hole of the flash tower 9, a discharging hole of the flash tower 9 is connected to a feeding hole of the crystallization evaporator 10, and the crystallization evaporator 10 is provided with a product discharging hole.
Further preferably, the number of the reaction-back flushing units in this embodiment is two, and the reaction-back flushing units include a first reaction-back flushing unit and a second reaction-back flushing unit, the first reaction-back flushing unit includes a first tubular reactor 3 and a first electromagnetic back flushing device 4 which are connected in series by a pipeline, the second reaction-back flushing unit includes a second tubular reactor 5 and a second electromagnetic back flushing device 6 which are connected in series by the pipeline, a feed port of the first tubular reactor 3 is connected to a feed port of the preheater 2, a feed port of the first tubular reactor 3 is connected to a feed port of the first electromagnetic back flushing device 4, a feed port of the first electromagnetic back flushing device 4 is connected to a feed port of the second tubular reactor 5, a feed port of the second tubular reactor 5 is connected to a feed port of the second electromagnetic back flushing device 6, and feed ports of the second electromagnetic back flushing device 6 are sequentially connected to feed ports of the pressure backup valve 7 and the gas-liquid separator 8.
Further preferably, the number of the first electromagnetic recoil devices 4 is two, and the two first electromagnetic recoil devices 4 are connected in parallel. The number of the second electromagnetic recoil devices 6 is two, and the two second electromagnetic recoil devices 6 are connected in parallel. The first electromagnetic recoil device 4 and the second electromagnetic recoil device 6 are also respectively provided with a liquid outlet.
The working principle of the utility model is as follows:
the reaction raw materials enter the first tubular reactor after passing through the metering pump and the preheater, and then the reaction liquid can adsorb iron metal impurities in the reaction liquid on the one hand through the electromagnetic recoil device, and on the other hand, the adsorbed impurities can be discharged through the upper liquid discharge port through the internal recoil force after the device runs for a certain time. And then the reaction liquid continuously reacts through the other tubular reactor, the two tubular reactors can realize temperature rise under different temperature regulation so as to improve the synthesis efficiency of the target product, and then the reaction liquid enters the next electromagnetic back-flushing device through a parallel pipeline and then sequentially passes through a gas-liquid separator, a flash tower and a crystallization evaporator, so that the high-purity high-quality glycine is finally obtained. The system pressure of the whole reaction device can be adjusted by a pressure-backup valve. Meanwhile, the electromagnetic recoil device is connected with a parallel pipeline, so that the continuity of the reaction process can be ensured, namely one branch works, and the other branch can wash impurities.
The utility model has the following advantages:
1) the continuous production of the glycine synthesis process by the hydroxyacetonitrile is realized, and the process is green and environment-friendly;
2) the content of impurities such as iron in the product is reduced, and the quality of the product is improved;
3) the blockage of a system pipeline caused by impurities generated by corrosion of a reaction liquid on materials is reduced, the safety risk of spraying and discharging of the system due to blockage is greatly reduced, and the safety is improved;
4) the device has the advantages of reducing equipment investment for device industrialization, indirectly reducing production cost and improving market competitiveness of products.
The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the protection scope of the present invention, which has the same or similar technical solutions as the present invention.
Claims (7)
1. The utility model provides a preparation glycine serialization device with clear stifled function of recoil, its characterized in that includes the preheating unit, one or more than one reaction-recoil unit, vapour and liquid separator, flash column and the crystallization evaporator that establish ties and link up through pipeline series connection in order, preheating unit is equipped with the raw materials feed inlet, preheating unit's discharge gate connect in the feed inlet of reaction-recoil unit, reaction-recoil unit's discharge gate connect in vapour and liquid separator's feed inlet, vapour and liquid separator's discharge gate connect in the feed inlet of flash column, flash column's discharge gate connect in the feed inlet of crystallization evaporator, the crystallization evaporator is equipped with the product discharge gate.
2. The glycine preparation serialization apparatus with the back-flushing unblocking function as claimed in claim 1, wherein the number of the reaction-back-flushing units is two, and the apparatus comprises a first reaction-back-flushing unit and a second reaction-back-flushing unit, the first reaction-back-flushing unit comprises a first tubular reactor and a first electromagnetic back-flushing device connected in series by the pipeline, the second reaction-back-flushing unit comprises a second tubular reactor and a second electromagnetic back-flushing device connected in series by the pipeline, a feed port of the first tubular reactor is connected to a discharge port of the preheating unit, a discharge port of the first tubular reactor is connected to a feed port of the first electromagnetic back-flushing device, a discharge port of the first electromagnetic back-flushing device is connected to a feed port of the second tubular reactor, a discharge port of the second tubular reactor is connected to a feed port of the second electromagnetic back-flushing device, and the discharge hole of the second electromagnetic backflushing device is connected with the feed hole of the gas-liquid separator.
3. A glycine preparation continuous device with a backflushing and blockage removing function as claimed in claim 2, wherein the number of the first electromagnetic backflushing devices is two, and the two first electromagnetic backflushing devices are connected in parallel.
4. A glycine preparation continuous device with a backflushing and blockage removing function as claimed in claim 2, wherein the number of the second electromagnetic backflushing devices is two, and the two second electromagnetic backflushing devices are connected in parallel.
5. A glycine preparation continuous device with a backflushing and blockage removing function as claimed in claim 1, wherein the first electromagnetic backflushing device and the second electromagnetic backflushing device are respectively provided with a liquid outlet.
6. A glycine preparation serialization apparatus having a back flushing and blockage removal function as claimed in claim 1, wherein said preheating unit comprises a metering pump and a preheater connected in series by said pipeline, said raw material feed port is disposed on said preheater, and a discharge port of said preheater is connected to a feed port of said reaction-back flushing unit.
7. A glycine preparation serialization apparatus having a back flushing unblocking function as in claim 1, wherein a back pressure valve is further connected in series between the discharge port of the reaction-back flushing unit and the feed port of the gas-liquid separator.
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| CN202122837664.1U CN216236781U (en) | 2021-11-18 | 2021-11-18 | Glycine preparation serialization device with clear stifled function of recoil |
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| CN202122837664.1U CN216236781U (en) | 2021-11-18 | 2021-11-18 | Glycine preparation serialization device with clear stifled function of recoil |
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