327results about "Peroxy compound preparation" patented technology

The invention belongs to the technical field of acyclic compounds, and particularly relates to a preparation method of tert-butyl peroxyisobutyrate. Stirring and cooling a solvent, a tert-butyl hydroperoxide aqueous solution and deionized water to obtain a mixed solution A; adding liquid caustic soda and a solid base catalyst into the mixed solution A under a stirring condition, and continuously stirring for reaction to obtain a mixed solution B; under the stirring condition, isobutyryl chloride and a water-soluble distributing agent are added into the mixed solution B, stirring reaction continues to be conducted, and a mixed solution C is obtained; standing and layering the mixed solution C, separating to obtain a tert-butyl peroxyisobutyrate crude product, and refining the tert-butyl peroxyisobutyrate crude product to obtain the tert-butyl peroxyisobutyrate. According to the method, the raw material utilization rate is increased, the reaction speed is increased, the reaction time is shortened, and the product yield is high.

The invention discloses a cross-linking agent for rubber and a preparation method thereof. The preparation method comprises the following steps: S11, dissolving 2, 4-dichlorobenzoic acid in tert-butyl alcohol, and dropwise adding concentrated sulfuric acid to obtain a mixed solution; s12, slowly dropwise adding a hydrogen peroxide solution into the mixed solution, and oxidizing to obtain a primary oxidized solution; s13, carrying out secondary oxidation on the primary oxidation solution obtained in the step S12 to obtain a secondary oxidation solution; and S14, purifying the secondary oxidation liquid obtained in the step S13 to obtain the cross-linking agent for rubber. The application of the cross-linking agent for the rubber in the rubber comprises the following steps: S21, banburying raw materials and the cross-linking agent for the rubber to prepare a rubber material; and S22, feeding the rubber material in the step S21 into a vulcanizing machine, and vulcanizing to obtain the rubber. The prepared cross-linking agent for the rubber is good in performance, the preparation method is simple, emission of three wastes is small, the atom utilization rate is high, and after the cross-linking agent is applied to the rubber, the prepared rubber is good in tensile strength, elongation at break and wear resistance index.

The invention provides a synthesis process of tert-amyl peroxy-2-ethylhexyl carbonate, and relates to the technical field of organic synthesis.The synthesis process comprises the following steps that S1, caustic soda liquid and water are pumped into a reaction kettle; s2, tert-amyl hydroperoxide is added into the reaction kettle for a salt forming reaction; s3, after the salt forming reaction is finished, adding a catalyst, dropwise adding isooctyl chloroformate, and carrying out condensation reaction to obtain a crude product of tert-amyl 2-ethylhexyl peroxide; and S4, carrying out alkali washing and water washing on the peroxide 2-ethylhexyl tert-amyl carbonate crude product to obtain a finished product. The catalyst is a tree-shaped structure catalyst of a silica gel carrier, and has the advantages of high conversion rate and high yield.

The utility model relates to the technical field of methyl ethyl ketone peroxide production, and discloses neutralization reaction equipment for methyl ethyl ketone peroxide production, which comprises a neutralization tank, a discharge pipe is communicated and mounted in the middle of the bottom side of the neutralization tank, and a feed cylinder is communicated and mounted at the top of the side wall of the neutralization tank. By opening the electromagnetic valve of the material guide pipe and closing the electromagnetic valves on the discharge pipe and the discharge pipe, an operator holds one side of the piston rod by hand and pulls the extrusion plate on one side of the piston rod to move towards the outer side, so that methyl ethyl ketone oxide in the material guide pipe is continuously sucked into the feeding cylinder; according to the volume of the methyl ethyl ketone oxide required to be added, an operator can stop pulling the piston rod, open the discharging pipe, close the electromagnetic valve of the material guide pipe and reversely push the extrusion plate at one end of the piston rod to guide quantitative methyl ethyl ketone oxide in the feeding cylinder into the neutralization tank, so that quantitative adding of the methyl ethyl ketone oxide is guaranteed, and the production efficiency is improved. And through extrusion of the extrusion plate, the methyl ethyl ketone oxide can be prevented from being adhered to the inner wall of the feeding cylinder.

The invention discloses a low-temperature stable organic peroxide emulsion and a safe preparation method thereof, and the emulsion comprises diisobutyryl peroxide, a hydroperoxide stabilizer, an organic solvent containing 2, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate, and an emulsifying / dispersing agent. Through a low-temperature high-shear dispersion coupling cyclic emulsification method and in combination with real-time combustible gas / oxygen / smoke monitoring, the problem of freezing of the emulsion under an extremely cold condition (-40 DEG C) and the decomposition risk in the preparation process are solved. The obtained emulsion has significantly improved storage stability (greater than or equal to 85 days), low viscosity and excellent fluidity, and is suitable for industrial production.

This invention provides a method for preparing tert-butyl peroxide, relating to the field of tert-butyl peroxide synthesis technology. The preparation method includes the following steps: S1: pumping liquid alkali and water into a reaction vessel; S2: adding tert-butyl hydrogen peroxide to the reaction vessel to carry out a salt formation reaction; S3: after the salt formation reaction is completed, adding benzoyl chloride and a catalyst to carry out a condensation reaction to obtain crude tert-butyl peroxide; S4: washing the crude tert-butyl peroxide with alkali and water, and then adding a stabilizer and a co-solvent to obtain the finished product. The preparation method can improve the yield and stability of tert-butyl peroxide.

The present invention relates to the technical field of tert-butyl hydroperoxide, and discloses a tert-butyl hydroperoxide processing homogeneous reaction kettle, the tert-butyl hydroperoxide processing homogeneous reaction kettle comprises a homogeneous reaction kettle body, a material inlet and a connection port, the material inlet and the connection port are arranged at the top of the homogeneous reaction kettle body, and a mixing mechanism is arranged in the homogeneous reaction kettle body, a heating mechanism is arranged on the outer side of the homogeneous reaction kettle body, a mixing mechanism comprises a driving motor, a connecting rod, a supporting rod, a stirring plate and a guide groove, and the driving motor is mounted in the middle of the top of the homogeneous reaction kettle body. According to the homogeneous reaction kettle for processing the tert-butyl hydroperoxide, tert-butyl hydroperoxide reactant mixed liquid is stirred by the stirring plate and the guide groove, so that the mixed liquid can move upwards or downwards, the reactants of the tert-butyl hydroperoxide can be comprehensively mixed, and the reactants of the tert-butyl hydroperoxide react more thoroughly; impurities in the tert-butyl hydroperoxide are reduced, and the quality of the tert-butyl hydroperoxide is improved.

The invention discloses a preparation method of tert-butyl peroxyneodecanoate, which is characterized in that zinc oxide is uniformly dispersed on a graphene oxide / attapulgite composite carrier interface in a nano-particle form through a hydrothermal method to form a supported catalyst with a high specific surface area, active sites are fully exposed, the catalytic efficiency is obviously improved, and the catalytic activity is improved. Zinc oxide and a carrier form strong interaction, in the reaction process, an adaptive alkaline system is optimized, the composite catalyst shows high selectivity in a sodium hydroxide / tert-butyl hydroperoxide system, the residual quantity of byproducts is smaller than or equal to 0.01%, reaction conditions are mild, high-temperature and high-pressure equipment is not needed, the catalyst can be recycled, and the content of metal ions in waste liquid is smaller than or equal to 0.1 ppm; the purity of the obtained product tert-butyl peroxyneodecanoate is more than or equal to 99.5%, the active oxygen content reaches 7.2-7.5%, the decomposition temperature is more than or equal to 120 DEG C, the 10h half-life period temperature is 75-80 DEG C, the initiation efficiency is more than or equal to 95% when the tert-butyl peroxyneodecanoate is used as an initiator, the light transmittance is more than or equal to 92%, the molecular weight distribution index is less than or equal to 2.5, no implosion phenomenon exists in the polymerization process, and the advantages of high efficiency, low consumption

The invention belongs to the technical field of organic peroxides, and particularly relates to a preparation method of peroxide (2-ethylhexyl) tert-amyl carbonate. The preparation method comprises the following steps: (1) carrying out temperature control reaction on a tert-amyl hydroperoxide crude product and a salt-forming agent under the action of a phase transfer agent to obtain an intermediate; (2) compounding a phase transfer catalyst system, blending the phase transfer catalyst system with chloroformic acid-2-ethylhexyl ester, adding the mixture and the intermediate into a reaction kettle for substitution reaction, and after the substitution reaction is finished, standing and collecting an upper organic phase to obtain a TAEC crude product; and (3) adding a detergent into the TAEC crude product, stirring, standing, collecting an upper oil phase, and washing until the oil phase is neutral to obtain TAEC. By compounding the phase transfer catalyst system, the problems of more dicarbonate byproducts, lower TAEC yield and difficulty in catalyst recovery in the existing TAEC synthesis method are solved.

The present invention relates to a method for obtaining disinfection and / or sterilisation solutions from a mixture of an alcohol and a dialkyl carbonate. Said mixture is placed in contact with O2 to obtain hydrogen peroxide (H2O2) by means of a photocatalytic reaction, followed by treatment of the resulting mixture with a catalyst to obtain peroxycarboxylic acid and final dilution with water. The present invention also relates to a system for carrying out the process continuously, as well as the preparation on demand of the active disinfection and / or sterilisation solution obtained using same.

The invention belongs to the field of catalysts and preparation thereof, and particularly relates to a catalyst, a preparation method thereof and a method for preparing peroxy acid. The catalyst comprises a modified molecular sieve and heteropoly acid loaded on the modified molecular sieve, and the surface of the modified molecular sieve is modified with alkyl and amino. When the catalyst is used for preparing peroxy acid, the conversion rate of organic acid can be increased, the equilibrium conversion rate is higher than 60%, and the selectivity of the prepared peroxy acid is gt; in addition, the catalyst can be recycled, and is suitable for industrial production.

The invention discloses an isobutane oxidation method and system. The method comprises the following steps: 1) mixing gas flow rich in isobutane and gas flow rich in nitrogen to prepare first carrier gas for later use; 2) uniformly mixing oxygen with a first carrier gas in proportion to obtain an oxygen-containing gas flow with the oxygen concentration of 1-10vol%; 3) feeding the oxygen-containing gas flow into the bottom of the reactor to react with liquid-phase iso-butane entering the reactor to generate tert-butyl hydroperoxide.The method ensures operability and safety of iso-butane oxidation reaction by setting two-component carrier gas of iso-butane and nitrogen in different proportions and introducing oxygen with safe concentration into the reactor through preparation, and is suitable for industrial production. Moreover, nitrogen circulation in the carrier gas is separately arranged, only one compressor needs to be arranged for a system with multiple reactors, meanwhile, liquid-phase materials of the multiple oxidation reactors overflow to the next stage by means of gravity, an inter-stage conveying pump is omitted, and equipment investment is reduced.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a method for preparing peroxy acid. The method comprises the following steps: S1, carrying out reaction on organic acid, hydrogen peroxide, a catalyst and a solvent in a first pre-reactor, and introducing a product obtained by the reaction into a first reactive distillation tower for reaction; s2, reacting the product obtained in the step S1 in a second pre-reactor, and introducing the product into a second reactive distillation tower for reaction after the reaction is finished; s3, the product obtained in the step S2 and a stabilizer are subjected to a reaction in a mixer, the stabilizer is a nitrogen-containing alkaline compound, lone pair electrons exist on N atoms, and the catalyst is selected from one or two or more of sulfuric acid, nitric acid, isopolyacid and heteropolyacid. By adopting the method to prepare the peroxy acid solution, the selectivity and yield of peroxy acid can be improved, and the total conversion rate of hydrogen peroxide is gt; the selectivity of peroxy acid is gt; meanwhile, caprolactone is prepared by using the peroxy acid to dissolve cyclohexanone oxide liquid, and the conversion rate of cyclohexanone is gt; the selectivity of the obtained caprolactone is gt; 85%.

Disclosed is the use of a dividing-wall column in a process for co-producing propylene oxide and styrene monomer. Feed streams to a dividing-wall column comprise a bottoms product produced in recovering crude propylene oxide from an epoxidation reaction product, a hydrogenated byproduct styrene monomer production, and a light fraction of a bottoms product withdrawn from the dividing-wall column. Products from the dividing-wall column comprise an overhead product comprising ethylbenzene for recycle to an oxidation zone, an intermediate product comprising methylbenzyl alcohol and acetophenone as feed to a dehydration zone to produce styrene monomer, and a bottoms product comprising methylbenzyl alcohol and heavy materials.

The invention belongs to the technical field of medical analysis, and particularly relates to a method for separating chemical components in hemsley rockvine root. According to the present invention, various chromatography methods are adopted to carry out separation and purification, such that sitroside (I), vanillyl glycolII (II), 5-hydroxymaltol (III), vanillic acid (IV), afzelin (V), 2, 3-dihydroxypyrazole (9E, 11E)-13-hydroxypyrazole (9, 11-dienoate), and 2, 3-dihydroxypyrazole (10E, 12E)-9-hydroxypyrazole (10, 12-dienoate) are obtained from hemsley rockvine root. Wherein the compounds II, III, VI and VII are separated from the hemsley rockvine root for the first time, and development and quality control of the hemsley rockvine root medicinal material are facilitated.

The present invention relates to the technical field of cumene hydroperoxide production, specifically to cumene hydroperoxide and its preparation method and application. Cumene is mixed with a composite stabilizer, hydrogen peroxide and TiO 2 -PW catalyst are added, and the reaction is carried out at 65 °C for 1.5 hours under nitrogen protection; then the temperature is raised to 85 °C and the reaction is carried out for 4 hours; the obtained reaction solution is cooled to 40 °C, and the catalyst is recovered by filtration; the aqueous phase is removed by liquid separation, and the organic phase is washed with 5% sodium bicarbonate solution until neutral; then the unreacted cumene is removed by vacuum distillation, and then treated by molecular sieve adsorption decolorization and ethanol recrystallization, and cumene hydroperoxide is obtained after drying. By using a composite stabilizer, the present invention effectively inhibits the decomposition of hydrogen peroxide, improves the stability of the reaction system, reduces the occurrence of side reactions, and improves the production efficiency.

The application discloses a composite catalyst and application thereof in synthesis of alkyl peroxide. The composite catalyst comprises a molecular sieve main catalyst with medium Brnsted acidity and a Lewis acid cocatalyst supported by a non-acid carrier. The composite catalyst provided by the application has the advantages of high activity, high reaction selectivity and long-term stability in the reaction for synthesizing alkyl peroxide.

The present invention relates to the technical field of the preparation of methyl ethyl ketone peroxide, and particularly relates to a preparation method of methyl ethyl ketone peroxide with low water content, which comprises the following steps: (1) adding hydrogen peroxide into a reaction kettle, adding a catalyst and stirring evenly, and then slowly dropping methyl ethyl ketone into the reaction kettle under stirring, and carrying out a reaction after the dropping is completed; (2) after the reaction is completed, adding a water separator into the reaction mixture, standing for stratification, and taking the upper-layer liquid; (3) freezing the upper-layer liquid, filtering the frozen liquid, and adding dimethyl phthalate into the filtrate for dilution to obtain the product. In the preparation method of methyl ethyl ketone peroxide with low water content of the present invention, by adding a freezing treatment process, the synthesized methyl ethyl ketone peroxide is frozen at -30 to -50 °C, greatly reducing the water content of methyl ethyl ketone peroxide. The water content of the prepared methyl ethyl ketone peroxide product is 4-5%, and the active oxygen content is 8-9%. The reaction performance and curing performance are good, and it has high production application value.

The application belongs to the technical field of chemical synthesis, and particularly relates to a preparation method of diisopropyl peroxydicarbonate and application of the diisopropyl peroxydicarbonate. The preparation method comprises the following steps: firstly, isopropyl chloroformate and an ester-soluble organic solution are added into a three-necked flask, stirring is started, hydrogen peroxide solution is added, when the temperature of the mixture in the flask is stabilized at-5 DEG C, sodium hydroxide solution is slowly added into the three-necked flask, and the time and temperature in the reaction process are controlled; finally, the organic phase is separated, washed with water, dried with anhydrous sodium sulfate, and obtained. The preparation method is safe and controllable, the yield of the diisopropyl peroxydicarbonate is high, the stability is good, the diisopropyl peroxydicarbonate can be directly used for the preparation of polyvinylidene fluoride, a chain transfer agent is not needed, polymerization can be carried out under low-temperature conditions, the molecular chain regularity of the polyvinylidene fluoride is improved, abnormal structures are few, the crystallinity is high, and the comprehensive performance is good.

The present invention relates to a method for preparing a mixture containing cyclohexanol and cyclohexanone, comprising the step of hydrogenating cyclohexyl hydroperoxide in cyclohexane in the presence of a Raney nickel catalyst to obtain cyclohexanol and cyclohexanone.

The invention belongs to the technical field of acyclic compounds, and particularly relates to a preparation method of tert-butyl peroxymaleate. Adding a tert-butyl hydroperoxide aqueous solution into deionized water, mixing, stirring and cooling to obtain a mixed solution; under a stirring condition, sequentially adding liquid caustic soda and sodium nitrate into the mixed solution, and continuing to stir and react after the liquid caustic soda and the sodium nitrate are added to obtain a reaction solution I; under the stirring condition, maleic anhydride is added into the reaction liquid I, stirring reaction continues after adding is completed, and reaction liquid II is obtained; under the stirring condition, acid is added into the reaction liquid II, stirring reaction continues after adding is completed, and reaction liquid III is obtained; adding deionized water into the reaction liquid III for washing, and performing suction filtration to obtain a tert-butyl peroxymaleate crude product; and washing and drying the tert-butyl peroxymaleate crude product to obtain the tert-butyl peroxymaleate. No organic solvent is added, the method is environmentally friendly, the cost is saved, and meanwhile the product yield can be increased to 93% or above.

The invention belongs to the technical field of cross-linking agents, and particularly relates to a high-stability cross-linking agent BIPB and a preparation method thereof. The high-stability cross-linking agent BIPB is prepared from the following raw materials in parts by weight: 20-30 parts of tert-butyl hydroperoxide, 5-10 parts of a BaSO4 / 4A zeolite composite material, 0.1-2 parts of polypropylene, 0.1-2 parts of alpha, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, a BaSO4 / 4A zeolite composite material is introduced in the process of preparing the cross-linking agent BIPB, the strong stability of the cross-linking agent BIPB is improved, the activity of the cross-linking agent is further improved by influencing the specific surface area and pore size distribution of 4A zeolite in the presence of BaSO4, the cross-linking reaction is accelerated, and the cross-linking effect of the cross-linking agent BIPB is improved. The compounding of BaSO4 and 4A zeolite can improve the dispersibility of BaSO4 and promote the uniform distribution of the cross-linking agent BIPB.

The present invention discloses a process for preparing m-chloroperbenzoic acid by using a molecular sieve catalyst, belonging to the technical field of chemical catalytic preparation, and comprising the following steps: S1, dissolving m-chlorobenzoic acid in an organic solvent, adding the molecular sieve catalyst, uniformly stirring, and then dropwise adding an aqueous oxidant solution with a mass fraction of 15% to 30% for an oxidation reaction; S2, after the oxidation reaction is completed, separating the molecular sieve by using a filter for the next reaction; S3, after separation, extracting and separating the organic phase, distilling and recovering the organic solvent to obtain m-chloroperbenzoic acid crystals. The present invention overcomes the defects and deficiencies in the existing process methods, such as low effective yield and serious wastewater pollution. A solid molecular sieve is used as the catalyst. The catalyst has stable properties, simple separation, the solvent can be recycled and reused in the process, the product yield is high, environmental problems caused by other oxidation methods are avoided, and it is beneficial to large-scale industrial production.

The application relates to the field of thermal catalysis, and discloses a method for preparing 1-cyclohexylbenzene hydrogen peroxide by solvent-free thermal catalytic selective oxidation of cyclohexylbenzene with molecular oxygen. The method uses a metal bromide as a catalyst, azobisisobutyronitrile or t-butyl hydroperoxide as an initiator, and pure oxygen as an oxidant, and can effectively selectively oxidize cyclohexylbenzene (CHB) into 1-cyclohexylbenzene hydrogen peroxide under normal pressure, solvent-free conditions and at a temperature above 90 DEG C. The catalytic system has the advantages of low cost, simple operation process, high catalytic oxidation efficiency and high selectivity of the target oxidation product.

This invention discloses a method for preparing tert-butyl benzoate peroxide using a microchannel reactor, comprising the following steps: adding liquid alkali to tert-butyl hydroperoxide, allowing it to stand and separate into layers, and obtaining the lower sodium salt; passing the obtained sodium salt into the microchannel reactor, simultaneously passing benzoyl chloride into the microchannel reactor for mixing and reaction; passing the material emanating from the microchannel reactor into an RTB reactor for incubation and reaction to obtain crude tert-butyl benzoate peroxide; purifying the crude tert-butyl benzoate peroxide to obtain tert-butyl benzoate peroxide. This invention employs continuous feeding and achieves the synthesis reaction through a microchannel reactor, reducing the reaction time from several hours to tens of seconds to several minutes, significantly improving reaction efficiency. The entire reaction process in the microchannel reactor used in this invention is a continuous reaction, which is safe and environmentally friendly, has high production efficiency, requires a small equipment footprint, is simple to operate, reduces manual operation, and lowers production costs.

The invention provides a preparation method of dicumyl peroxide. The preparation method comprises the following steps: under the conditions of an inhibitor and an acidic catalyst, cumyl hydroperoxide and alpha, alpha-dimethyl benzyl alcohol are subjected to a condensation reaction, and vacuum dehydration is carried out during the condensation reaction process. The combined inhibitor can greatly inhibit decomposition of dicumyl peroxide and dicumyl peroxide, and finally high conversion rate of raw materials, high selectivity of products and intrinsic safety of the reaction process are achieved. Wherein the conversion rate of the cumyl hydroperoxide is 99.5% or above, and the selectivity of the dicumyl peroxide is 98% or above.

ELIMINATION OF IMPURITIES WITHIN AN ORGANIC PEROXIDE The present invention relates to the use of a zeolitic adsorbent material, to purify organic peroxides, and more particularly to eliminate the impurities present in these compositions of organic peroxides.

In one aspect, the disclosure relates to a method for oxidizing alkanes to produce industrially useful solvents and other compounds. In a further aspect, the method includes the steps of contacting an alkane or mixture of alkanes with a core-shell nanoparticle and an oxidant to produce a mixture and then irradiating the mixture with UV and / or visible light. The methods are selective for desired products and do not produce overoxidized species such as, for example, carbon dioxide. In a still further aspect, the methods are scalable and can be conducted for a short time under relatively mild conditions. In an aspect, the core-shell nanoparticle includes a metal-oxide containing semiconductor core, an amorphous, radiation transparent shell, and optional metal nanoparticle dopants in the shell. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

The invention provides a preparation method, an oxidation reaction device and a production system of m-diisopropylbenzene dihydroperoxide, and relates to the technical field of organic synthesis. The preparation method of the m-diisopropylbenzene dihydrogen peroxide comprises the following steps: in the presence of alkali liquor, carrying out oxidation reaction on m-diisopropylbenzene and oxygen to obtain first feed liquid of the m-diisopropylbenzene dihydrogen peroxide; wherein in the oxidation reaction process, the pH value of a reaction system is controlled to be 9-11, and the viscosity of the reaction system is controlled to be smaller than 10 mPa.s. According to the preparation method of the m-diisopropylbenzene hydrogen peroxide, the pH value in the reaction liquid is regulated and controlled on line, and the generation of high-viscosity components is reduced, so that normal operation of the oxidation reaction of m-diisopropylbenzene and oxygen is ensured, side reactions are weakened, the mass transfer effect is enhanced, and the reaction efficiency is improved.

The invention discloses organic ketone peroxide neutralization reaction equipment which structurally comprises a reaction tank, a motor is fixedly installed at the middle end of the top of the reaction tank, the output end of the motor drives a stirring rod arranged at the middle end in the reaction tank to rotate, a lifting plate is installed on the upper middle portion of the stirring rod, the lower end of the lifting plate is connected with an exhaust hood, and the exhaust hood wraps the stirring rod. According to the present invention, according to the height of the liquid in the reaction tank during the neutralization reaction process, the floating ball is suspended on the liquid surface so as to drive the lifting plate to perform lifting adjustment, such that the defoaming plate is driven to be located at the upper layer of the liquid; the stirring rod rotates and drives the connecting outer ring and the eight defoaming plates to synchronously rotate at the same time, and the spring guide rods apply elastic guidance to the defoaming plates, so that the defoaming plates repeatedly and elastically swing on the spring guide rods, and the long needles arranged on the bottom surfaces of the defoaming plates puncture bubbles generated in the neutralization reaction process.