146 results about "Chloroacetic acids" patented technology

The invention relates to the technical field of industrial process control, in particular to a chloroacetic acid production data storage method and system, and the method comprises the following steps: obtaining an initial temperature, reaction time and ratio, extracting a feeding batch and chlorine flow, sorting a parameter and batch correspondence table, judging the process consistency of adjacent batches, generating a grouping table, and establishing a channel label structure. Path level information is sorted, a stage path table is generated, data archiving is completed, and the numbering relation is registered. According to the method, accurate integration of batch data is realized through cross acquisition of multi-source parameters and time information association. And the process consistency identification accuracy is improved based on the dynamic judgment of the adjacent batch parameter floating range. The establishment of the channel affiliation relationship ensures that the data structure is clear, the path hierarchical mapping is combined with the operation state and the time label, and the staged data organization capability is enhanced. And the data arrangement efficiency and traceability are improved through automatic filing, and the constitutive property and collaboration of batch data management are integrally enhanced.

The invention belongs to the technical field of medicinal chemistry, and particularly relates to a dammarane sapogenin-isatin derivative and application thereof in anti-tumor treatment. The dammarane sapogenin-isatin conjugate is constructed by taking dammarane sapogenin as a mother nucleus, deriving the dammarane sapogenin and chloroacetic acid and then introducing an indolone structural unit, and R1, R2 and R3 are as described in the claims and the specification. According to the invention, isatin fragments and ginsenoside are coupled for the first time, the anti-tumor activity of the compounds is systematically evaluated, and the action mechanism research of the compounds in colorectal cancer and other tumors is further developed. Results show that the obtained compound has relatively good anti-tumor efficacy, tumor cell selectivity, relatively low toxicity and relatively high bioavailability, and shows good patent medicine potential and wide market prospects.

The invention belongs to the technical field of acyclic compounds, and particularly relates to a method for preparing glycine by an aqueous phase method. Mixing the ammonium salt aqueous solution, chloroacetic acid and a catalyst, adding ammonia gas, and carrying out ammonification reaction to obtain a reaction solution; cooling and crystallizing the reaction liquid, performing primary centrifugal separation to obtain a glycine crude product and a primary separation liquid, and drying the glycine crude product to obtain a glycine product; adding an ammonium source into the primary separation liquid for dissolving to obtain an ammonium dissolving liquid; cooling the ammonium dissolving solution, and performing secondary centrifugal separation to obtain an ammonium chloride crude product and a secondary separation solution; the ammonium chloride crude product is dried to obtain an ammonium chloride byproduct, and the secondary separation liquid continues to participate in the ammoniation reaction. According to the invention, steam consumption is reduced, the catalyst utilization rate is improved, and the product yield is high.

The invention provides nano cellulose as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) carrying out heating reaction on a mixed solution containing a biomass material and a eutectic solvent, and filtering to obtain fibers; (2) mixing the fiber with a solvent, and performing ultrasonic treatment to form the nano cellulose; wherein the eutectic solvent comprises a hydrogen bond donor and a hydrogen bond acceptor, the hydrogen bond donor is selected from 2-aldehyde acetic acid and / or chloroacetic acid, and the hydrogen bond acceptor is selected from choline chloride. The preparation method provided by the invention can effectively reduce the cost and energy consumption for synthesizing the nano cellulose.

The invention discloses a preparation method of 3-quinuclidinone hydrochloride, which comprises the following steps: carrying out temperature control reaction on 4-picolinic acid and chloroacetic acid under alkaline water conditions to obtain an aqueous solution of a compound a, and directly entering the next reaction without post-treatment after the reaction is finished; adding a reducing agent alkaline water system into the aqueous solution of the compound a, controlling the temperature to react, controlling the temperature to adjust the pH value to 5-5.5 after the reaction is finished, extracting with n-butyl alcohol, and drying to obtain an n-butyl alcohol solution of a compound b, and directly entering the next reaction step; wherein the reducing agent is one of sodium borohydride and potassium borohydride; dropwise adding thionyl chloride into an n-butyl alcohol solution of the compound b, controlling the temperature to react after dropwise adding is ended, and concentrating to remove the solvent and unreacted thionyl chloride after the reaction is ended, so as to obtain a compound c; carrying out Dieckmann condensation reaction on the compound c at controlled temperature under the condition of organic alkali by using toluene as a solvent, carrying out hydrochloric acid quenching reaction after the reaction is finished, and directly carrying out next-step reaction after extracting and removing impurities from a water phase containing a hydrochloride solution of a compound d by using toluene; and carrying out a decarboxylation reaction on the compound d in a hydrochloric acid aqueous solution at controlled temperature, after the reaction is finished, adjusting the pH value to 10-13, extracting, and salifying to obtain a target compound TM, namely 3-quinuclidinone hydrochloride. The preparation method of 3-quinuclidinone hydrochloride provided by the invention has the advantages of economical and easily available raw materials, mild reaction conditions, efficient reaction, simple operation and low cost, and is suitable for industrial application.

This invention provides a continuous method for preparing high-purity creatine monohydrate, comprising the following steps: a) adding chloroacetic acid aqueous solution dropwise to an aqueous methylamine solution, stirring at room temperature for 2 hours after the addition is complete; b) heating to 50-60°C and holding for 1 hour to remove most of the methylamine, then heating to 95°C to evaporate the methylamine aqueous solution for 1 hour; c) adding sodium hydroxide solution dropwise to the solution from step b) at 95°C, then heating to 105°C and concentrating under reduced pressure for 1.5 hours to approximately half the original volume, obtaining a creatine solution with a concentration of 30%-40%; d) cooling the solution from step c) to 40-60°C and adding a catalyst; e) drying to obtain pure creatine monohydrate. This invention reduces the methylamine equivalent, saving costs, and eliminates the need for purifying creatine for direct use in the next reaction; it can simultaneously lower the system reaction temperature and pH value to inhibit the formation of byproducts dicyandiamide and creatinine, and eliminates the need for debittering agents for purification and debittering, thus saving production costs.

The invention belongs to the technical field of glycine preparation, and particularly discloses a preparation method of glycine. The method comprises the following steps: controlling the reaction temperature, efficiently synthesizing ammonium chloroacetate from chloroacetic acid and liquid ammonia in a reactor, carrying out catalytic ammonolysis on the ammonium chloroacetate and ammonia gas in a reactor filled with a solid catalyst to realize continuity and reinforcement of the process, and carrying out alcohol precipitation crystallization, separation and purification to obtain glycine. The solid catalyst provided by the invention has the advantages of simple preparation, reproducibility, long service life, no metal pollution, easily available raw materials, controllable cost, long-acting cyclic utilization, high efficiency, simple recovery and the like; the method for preparing glycine by using the solid catalyst solves the problems of high consumption, high recovery cost, low production and purification efficiency and pollution caused by the traditional catalyst, and is a key technology for green and low-cost industrial production of glycine.

The utility model relates to a chloroacetic acid production device for processing glycine, which is characterized in that an interlayer is arranged in the outer wall of a chlorination kettle, the side end is connected with a liquid level meter a, and a discharge pipe is arranged on the lower surface; a radar liquid level instrument, a chlorine feeding pipe, an on-line component analyzer, an on-line thermometer, an on-line hydrometer, a condensation pipe, a catalyst filling pipe and an acetic acid feeding pipe are sequentially arranged on the upper surface, the lower end of the chlorine feeding pipe is connected with a gas distributor, and the condensation pipe is externally connected with a condenser; the catalyst filling pipe is externally connected with a catalyst metering tank; a liquid level meter b is connected to the side end of the kettle body, a discharging pipe is arranged on the lower surface of the kettle body, a water supplementing pipeline is connected to the right side of the upper surface of the kettle body, a liquid inlet pipe and an online moisture measuring device are arranged on the left side of the upper surface of the kettle body, and the liquid inlet pipe is communicated with the discharging pipe; the upper end of the stirrer is connected with a stirring motor, and the lower end is connected with a frame-type stirring paddle; the utility model has the advantages of reasonable structural design and good use effect.

The application provides a preparation method of a rare earth metal adsorption and separation resin and a resin extraction column. The preparation method comprises the following steps: adding an oil phase composed of styrene, divinylbenzene, a pore former and an initiator into an aqueous phase containing a dispersant and an inorganic salt to perform suspension polymerization, so as to obtain a white ball resin; performing phthalimide and hydrolysis on the white ball resin, so as to obtain a primary amine resin; performing reaction on the primary amine resin with chloroacetic acid and an alkaline medium, so as to perform carboxymethylation on part of the primary amine sites; and performing reaction on the obtained intermediate resin with phosphorous acid, formaldehyde and an acidic medium, so as to perform phosphonic acid methylation on the remaining part of the primary amine sites. The white ball resin is first subjected to amination, and then part of the carboxymethylation and part of the phosphonic acid methylation are sequentially performed, so that the carboxyl type chelation sites and the phosphonic acid type chelation sites are simultaneously reserved in the same resin bead, thereby being beneficial to improving the comprehensive adsorption performance and separation performance of the resin on the rare earth metal.

This invention discloses a rice straw-based liquid mulch film emulsion, its preparation method, and its application. The preparation method includes: treating pretreated rice straw with an alkaline solution in sodium hydroxide to obtain rice straw fibers and a silicon-containing black liquor; washing and bleaching the rice straw fibers to obtain bleached rice straw fibers; allowing the silicon-containing black liquor to stand, adjusting the pH value, and allowing it to stand again to obtain a silicon-containing dispersion; mixing and activating the bleached rice straw fibers with an alkaline alcohol solution, followed by etherification with chloroacetic acid to obtain carboxymethyl cellulose; mixing polyvinyl alcohol and carboxymethyl cellulose solutions, adding the silicon-containing dispersion under stirring, and then adding water to obtain the rice straw-based liquid mulch film emulsion. The rice straw-based liquid mulch film emulsion prepared by this invention can be used for soil covering in cultivated soils, exhibiting excellent film-forming strength, toughness, light-blocking properties, and soil cover adaptability. It has a wide range of raw material sources, a simple preparation process, and is suitable for large-scale promotion.

The utility model discloses a cleaning system for industrial glycine dirty materials by chloroacetic acid ammonolysis, which comprises a vibrating screening machine, a material dissolving tank, a clarifying tank and a crystallizing kettle which are sequentially connected through pipelines, the material dissolving tank is of a cylindrical structure, a stirring device is arranged in the material dissolving tank, a water inlet is arranged at the top of the material dissolving tank, a jacket is arranged on the outer side of the material dissolving tank, and the crystallizing kettle is arranged in the jacket. A steam inlet and a steam outlet are formed in the jacket, a liquid level transmitter and a temperature transmitter are arranged in the material melting tank, the bottom of the vibrating screen machine is connected with a feeding port of the material melting tank, a discharging port in the bottom of the material melting tank is connected with a feeding port in the top of the clarifying tank, and a filter is arranged on a connecting pipeline of the clarifying tank and the crystallization kettle. According to the method, different types of glycine dirty materials can be effectively cleaned, impurities in the different types of glycine dirty materials can be effectively removed, a pure glycine product is obtained, and recycling of resources is achieved.

The invention belongs to the technical field of acyclic compounds, and particularly relates to a method for preparing chloroacetic acid by hydrogenation reduction of dichloroacetic acid, which comprises the following steps: A1, adding a chlorination liquid containing dichloroacetic acid into a raw material storage tank, mixing with hydrogen, and heating to obtain a mixed material; a2, conveying the mixed material into a hydrogenation reactor loaded with a composite metal modified catalyst for reaction to obtain chloroacetic acid liquid and mixed gas; and A3, conveying the mixed gas to a stripping tower, condensing the mixed gas through a condenser to obtain hydrogen chloride gas and condensate, and conveying the condensate to the hydrogenation reactor again for recycling. According to the method disclosed by the invention, a byproduct, namely the chlorination liquid, generated in a chlorination reaction in a chloroacetic acid production process is used as a reaction raw material, dichloroacetic acid and trichloroacetic acid in the chlorination liquid can be effectively reduced into chloroacetic acid, and other substances in the chlorination liquid cannot be influenced.

The invention discloses a chloroacetic acid modified epoxy resin precursor. The structure of the chloroacetic acid modified epoxy resin precursor is shown as a formula (I) or a formula (II). The invention also discloses a marine antifouling coating, the marine antifouling coating is obtained by carrying out gradient curing reaction on the chloroacetic acid modified epoxy resin precursor and E51 epoxy resin under the action of a curing agent, and the prepared marine antifouling coating structurally contains betaine ester groups and pyrrolidone structures. The marine antifouling paint with the pyrrolidone structure can be subjected to ring opening in a seawater (pH = 8.2) environment, and hydrolysis of ester bonds is promoted by improving hydrophilicity and influencing near ester bond electron cloud density, so that the marine antifouling paint has seawater degradability. In addition, ester bonds in betaine ester groups can also be hydrolyzed in seawater. Secondly, the betaine ester group has the non-specific bactericidal activity of quaternary ammonium salt. The formula (I) and the formula (II) are shown in the description.

The invention discloses a high-wettability and strong-adhesion cross-linking enhanced dust fall material. The dust fall material comprises the following raw materials in parts by mass: 2-5 parts of pullulan, 2-5 parts of agarose, 5-15 parts of sodium hydroxide, 5-15 parts of chloroacetic acid, 5-15 parts of ethylene glycol diglycidyl ether, 3-11 parts of malic acid, 5-10 parts of a water-retaining agent, 5-10 parts of diluted hydrochloric acid and 1000-2500 parts of distilled water. The dust falling material has high wettability and strong adhesion, and can effectively settle coal dust in air; meanwhile, a coal dust consolidation layer formed after the dust falling material is sprayed is high in strength, reentrainment of dust can be effectively prevented, and the technical problems that the dust falling material is poor in dust falling effect, single in function and the like are solved.

The invention discloses bio-based polyamide with low water absorption and a preparation method thereof, and belongs to the technical field of polyamide preparation. The bio-based polyamide with the low water absorption rate is prepared from the following components in parts by weight: 30 to 50 parts of pentamethylene diamine, 15 to 30 parts of sebacic acid, 5 to 12 parts of citric acid, 5 to 10 parts of hexamethylenediamine, 2 to 5 parts of a hydrophobic auxiliary agent and 1 to 5 parts of a modified high-temperature-resistant additive, the hydrophobic additive is prepared from acetoxybenzoic acid, nonadecanoic acid, m-dimethoxybenzene, trifluoroacetic anhydride and methyl tert-butyl ether as raw materials, and the modified high-temperature-resistant additive is prepared from o-phenylenediamine, chloroacetic acid, vanillin, benzoyl bromide and thiourea as raw materials. The bio-based polyamide prepared from the substances has low water absorption and excellent thermal stability.

The utility model belongs to the technical field of production of chemical raw materials, and particularly relates to a device for recovering chloroacetic acid from heavy components of chloroacetic acid, which comprises a stripping tower, the bottom of the stripping tower is connected with a flash tank through a discharge pipe, the top of the flash tank is provided with a venturi ejector, and the venturi ejector is provided with a gas ejector pipe and a steam inlet pipe. The top of the stripping tower is sequentially connected with a cooler and a storage tank through an exhaust pipe, a bottom outlet of the storage tank is connected with the upper part of the stripping tower through a return pipe, the return pipe extends to the inner cavity of the stripping tower and is connected with a liquid distributor, and a feeding pipe is arranged on the side wall of the stripping tower. The device disclosed by the utility model can be used for recovering chloroacetic acid in the heavy components of chloroacetic acid, avoiding resource waste caused by treatment of the heavy components of chloroacetic acid, saving the use cost of materials and simultaneously reducing environmental pollution.

The invention provides a bagasse nanocellulose-based antibacterial composite film as well as a preparation method and application thereof, and belongs to the technical field of food packaging materials. The preparation method comprises the following steps: sequentially carrying out alkali treatment, bleaching treatment and acid treatment on bagasse to obtain bagasse microcrystalline cellulose; the preparation method comprises the following steps: reacting bagasse microcrystalline cellulose, absolute ethyl alcohol and chloroacetic acid, and shearing after the reaction is finished, so as to obtain chloroacetic acid grafted and modified bagasse nano cellulose; dispersing konjac glucomannan in water to obtain a konjac glucomannan dispersion liquid, then adding citrus essential oil and bagasse nanocellulose into the konjac glucomannan dispersion liquid to carry out a secondary reaction, adding a plasticizer after the reaction is finished, and adjusting the pH value with citric acid to obtain a film forming liquid; and drying the film forming liquid to obtain the bagasse nano cellulose based antibacterial composite film. The antibacterial composite film prepared by the invention has excellent tensile strength, water vapor permeability and antibacterial activity, and can be used for monitoring the freshness of high-protein food.

The utility model discloses a system for recycling chloroacetic acid by dechlorinating dichloroacetic acid through photocatalysis, which relates to the technical field of chloroacetic acid synthesis equipment and comprises a collecting tank I used for collecting mother liquor containing dichloroacetic acid during preparation of chloroacetic acid, and the collecting tank I is sequentially connected with a plurality of stages of condensers and a filter I through pipelines. A filtrate outlet I of the filter I is sequentially connected with a storage tank, a photocatalytic reaction kettle, a plurality of stages of condensers and a filter II; a filtrate outlet II of the filter II is connected with the storage tank through a reflux pipeline; stirring mechanisms are arranged in the collecting tank I and the photocatalytic reaction kettle, an ultraviolet visible light lamp is mounted in the photocatalytic reaction kettle, a material inlet of the photocatalytic reaction kettle is connected with a mother liquor supply pipeline, a water supply pipeline, a catalyst supply pipeline and a hydrogen supply pipeline, and the collecting tank I is connected with a nitrogen pipeline. The yield of chloroacetic acid prepared by an acetic anhydride catalysis method is improved, the generation of waste liquid is reduced, and the treatment cost of wastewater is reduced.

The invention relates to the field of macromolecules, and discloses a method for refining polyetherketoneketone and a polyetherketoneketone refined product. The method comprises the following steps: (1) treating a polyetherketoneketone complex by adopting a pretreatment agent; (2) the polyether ketone ketone crude product and a mixed chain supporting solution are mixed and washed, a first product is obtained, the mixed chain supporting solution comprises a main chain supporting agent and a cosolvent, the main chain supporting agent comprises one or more selected from parachlorophenol, trifluoroacetic acid, difluoroacetic acid, dichloroacetic acid and chloroacetic acid, the cosolvent comprises one or more selected from N, N-dimethylformamide and dimethyl sulfoxide, and the main chain supporting agent comprises one or more selected from dichlorophenol, trifluoroacetic acid, difluoroacetic acid, dichloroacetic acid and chloroacetic acid. The solvent is one or more of water, N-methyl pyrrolidone and N-methyl formamide; (3) adding a mixed aqueous solution into the first product to remove at least part of metal ions to obtain a second product; and (4) washing the second product for multiple times by using an organic solvent, and washing and drying to obtain the refined polyether ketone ketone. The content of aluminum ions in the polyetherketoneketone prepared by the method is low.

The utility model relates to the technical field of chloroacetic acid production, in particular to a feeding device for chloroacetic acid production, which comprises a base, a support plate is fixedly connected to the top of the base, an inclined component is fixedly connected to one side of the support plate, and a feeding barrel is fixedly connected to one side of the inclined component. The middle of one side of the feeding barrel is fixedly connected with a fixing assembly. According to the feeding device for chloroacetic acid production, due to the arrangement of the rotating rod, the servo motor and the fixing block, when internal materials are few, the servo motor is started, the servo motor operates to drive the rotating rod, the fixing block and the feeding barrel to rotate, and then through the arrangement of the first connecting plate, the second connecting plate, the supporting block and the fixing rod, the feeding barrel can be driven to rotate; and the feeding barrel is supported, so that the angle of the feeding barrel is inclined, the effect of enabling internal materials to flow out as much as possible is achieved, and waste of the materials is avoided.

The invention discloses a biosynthesis process of creatine monohydrate, and belongs to the technical field of bioengineering. The invention discloses a creatine monohydrate biosynthesis method, which is characterized in that sarcosine invertase is utilized to catalyze chloroacetic acid and monomethylamine to generate N-alkylation reaction so as to prepare sarcosine, and then creatine monohydrate is generated under the catalysis of the creatine invertase, the process is mild in reaction condition, the temperature is 25-37 DEG C, the pH is 6.0-8.0, the energy consumption is lower, the conversion efficiency is high, the environment is protected, and the economical efficiency is high. The invention provides a new synthesis method for sustainable synthesis of creatine monohydrate, and provides a new idea for industrial production of creatine monohydrate.

The invention relates to the technical field of unqualified product treatment equipment, in particular to an unqualified product chloroacetic acid waste dissolving tank and a working method.The unqualified product chloroacetic acid waste dissolving tank comprises a dissolving tank body, a stirring device and a temperature control device.The dissolving tank body is provided with a feeding port and a discharging port, and the stirring device comprises a stirring shaft sleeve, stirring blades and a motor; the temperature control device comprises a heating jacket arranged outside the dissolving tank body in a sleeving mode, a connecting pipeline communicated with a heat source is arranged on the heating jacket, the temperature control device further comprises a temperature sensor, the detection end of the temperature sensor is located in the dissolving tank body, and the temperature sensor is in signal connection with the heat source through a controller. According to the technical scheme, chloroacetic acid waste and a solvent are fully contacted and mixed through the stirring device, the dissolving speed is greatly increased, the temperature control device ensures that the temperature in the dissolving tank body is stabilized in a proper dissolving temperature range, and effective treatment and recycling of unqualified chloroacetic acid waste are achieved.

The application provides a method for selectively recovering lithium, nickel, cobalt and manganese from waste lithium battery ternary positive electrode materials, and belongs to the field of lithium battery metal recovery. The method comprises at least the following steps in sequence: leaching lithium, nickel, cobalt and manganese from the waste lithium battery ternary positive electrode materials; precipitating lithium and nickel; and precipitating manganese cobalt oxalate dihydrate. The method does not use strong acid, and uses a solvent formed by chloroacetic acid and tetrabutylammonium chloride to completely dissolve the metals in the positive electrode of the waste lithium battery, and then different metals are recovered step by step. The method has a simple process, can realize the recovery and utilization of multiple metals under mild conditions, and is easy to regenerate.

The invention relates to a quaternary ammonium salt collecting agent for reverse flotation of refractory hematite at room temperature and application of the quaternary ammonium salt collecting agent, the quaternary ammonium salt collecting agent is structurally a cationic compound with an ester group, n-caprylic alcohol and chloroacetic acid react to obtain octyl chloroacetate, and then the octyl chloroacetate reacts with tertiary amine. The molar ratio of n-caprylic alcohol to chloroacetic acid is 1: (1.05-1.15), the reaction temperature is 80-90 DEG C, and the reaction time is 7-9 hours; the molar ratio of the octyl chloroacetate to the tertiary amine compound is 1: (1.1-1.3), the reaction temperature is 70-90 DEG C, and the hematite room-temperature reverse flotation quaternary ammonium salt collecting agent is obtained by reacting in an acetonitrile solvent for 2-6 hours. The quaternary ammonium salt collecting agent with the ester group is independently applied to room-temperature reverse flotation of the refractory hematite.

The present invention discloses a glycine mixed crystal intermediate production method, and relates to the technical field of glycine production, the method comprises the following specific steps: raw material mixing and heating reaction: crushed solid chloroacetic acid, crushed liquid chloroacetic acid and recovered mother liquor are added into a continuous reaction kettle together, in the continuous reaction kettle, a reaction is performed for 2-4 h, the reaction temperature of the neutralization reaction stage is controlled in a low-temperature reaction zone, and after the neutralization reaction is completed, the reaction stage of generating glycine is entered. In the crystallization process, glycine and ammonium chloride are naturally saturated and separated out in the mother liquor to generate an intermediate, so that the operation steps and the use amount of methanol are reduced, and the crystallization process is continuously completed; meanwhile, the loss of urotropin in the reaction mother liquor is extremely small, the mother liquor can be recycled, and the mixture is put into the reaction kettle again after being mixed with new solid chloroacetic acid or liquid chloroacetic acid, so that the recovery rate of glycine is increased.

The utility model relates to the technical field of chemical equipment, and particularly discloses a liquid chlorine reactor which comprises a reactor main body, a liquid chlorine feeding pipe is arranged at the top end of the reactor main body in a penetrating manner, the bottom end of the liquid chlorine feeding pipe is fixedly connected with a liquid chlorine distribution pipe, and the liquid chlorine feeding pipe is communicated with the liquid chlorine distribution pipe; a plurality of nozzle assemblies are fixedly arranged on the upper end surface of the liquid chlorine distribution pipe at intervals; the nozzle assembly comprises a nozzle shell and a nozzle which are fixedly arranged on the upper end face of the liquid chlorine distribution pipe, the nozzle is located in the nozzle shell, an expansion piece is arranged at the top end of the nozzle, a spring is fixedly connected to the middle of the upper end face of the expansion piece, and the end, away from the expansion piece, of the spring is fixedly connected with the nozzle shell. According to the utility model, through the matching arrangement of the expansion sheet and the spring, the generated chloroacetic acid can be effectively prevented from entering the liquid chlorine distribution pipe and the liquid chlorine feeding pipe, the problem that the liquid chlorine distribution pipe and the liquid chlorine feeding pipe are blocked and then broken is avoided, and the safety of the device is improved.

The utility model discloses a glycine synthesis system, which belongs to the technical field of glycine production and is characterized in that a chloroacetic acid concentrated solution, a urotropine concentrated solution and liquid ammonia are added into a reaction kettle and are kept within a certain pH value range, the reaction is kept for a period of time after the dropwise addition is finished, and the materials sequentially flow through a first cooler and a first centrifugal machine; adding a solid material separated by the first separator into a high-temperature pulping kettle, enabling a liquid material separated by the first centrifugal machine to flow into an alcohol precipitation kettle for continuous extraction and synthesis, enabling the material to enter a third centrifugal machine, and adding a solid material separated by the third centrifugal machine into the high-temperature pulping kettle; a liquid material separated by the third separator is added into a water methanol rectifying tower to recover water methanol and flows into a water methanol transfer tank to be stored, water methanol is added into the high-temperature pulping kettle to be subjected to reflux pulping and then flows into a second centrifugal machine, qualified glycine products flow out through a product discharging pipe, and a liquid material separated by the second centrifugal machine flows into the water methanol rectifying tower.

The utility model discloses a hydrogen chloride removal system suitable for a process of producing chloroacetic acid by an acetic acid method, and belongs to the technical field of glycine production. The hydrogen chloride removal system comprises a separation kettle, a condenser, a packing absorption tower and an acetyl chloride recovery tank, the separation kettle is connected with the chlorination reaction kettle, and the separation kettle is connected with the condenser; the condenser is connected with the separation kettle through a return pipe, a non-condensable gas outlet on the condenser is connected with the packing absorption tower through a non-condensable gas outlet pipe, and a vacuum pump is arranged on the non-condensable gas outlet pipe; the packing absorption tower is connected with an acetic acid inlet pipe, an upper gas phase outlet of the packing absorption tower is connected with a tail gas treatment system, and the packing absorption tower is connected with an acetyl chloride recovery tank through an acetyl chloride outlet pipe; the acetyl chloride recovery tank is connected with the chlorination reaction kettle through a recycling pipe and is also connected with the packing absorption tower through a circulating pipe. Acetyl chloride in a chloroacetic acid finished product is recovered and used for a chlorination process, so that the consumption of raw material acetic anhydride is reduced; and meanwhile, the loss amount of raw material liquid ammonia in the subsequent ammoniation process is reduced.

This invention discloses a cross-linked carboxymethyl corn starch adsorbent, its preparation method, and its application. The method involves first mixing corn starch with 85%-95% ethanol (by mass) and stirring until homogeneous; adjusting the pH of the starch emulsion to 10-12, preheating at 50-60°C, adding 0.1%-0.15% epichlorohydrin (by dry starch weight), and continuously stirring for 1-2 hours; after cooling to room temperature, adding solid sodium hydroxide for alkalization, adding chloroacetic acid to the alkalized system, and reacting at 50-60°C for 2-4 hours; after the reaction, adjusting the pH of the reaction system to 6-7, filtering, washing, drying, and sieving to obtain the cross-linked carboxymethyl corn starch adsorbent. This invention overcomes the defects of poor structural stability and low adsorption capacity of unmodified starch. The resulting adsorbent is environmentally friendly, has excellent adsorption performance, and the preparation process is simple, controllable, and low-cost.