318 results about "Acetyl chloride" patented technology

The present disclosure provides an integrated process for producing trifluoroiodomethane (CF3I), in three steps: a) reacting a first reactant stream comprising hydrogen (H2) and iodine (I2) in the presence of a first catalyst to produce a first product stream comprising hydrogen iodide (HI); (b) reacting the first product stream with a second reactant stream comprising trifluoroacetyl chloride (TFAC) in the presence of a second catalyst to produce an intermediate product stream comprising trifluoroacetyl iodide (TFAI); and (c) reacting the intermediate product stream to produce a final product stream comprising trifluoroiodomethane. (CF3I).

The invention belongs to the technical field of specific fluorescent probe detection, and particularly relates to a near-infrared fluorescent probe for detecting hydrazine hydrate as well as a preparation method and application of the near-infrared fluorescent probe. The structural formula of the near-infrared fluorescent probe is # imgabs0. The invention provides a preparation method for synthesizing the probe by taking xanthene dye and acetyl chloride as raw materials. By researching the fluorescence spectrum of the fluorescent probe, the selectivity of the probe on N2H4 is evaluated, the fluorescence intensity of the probe is determined to be obviously enhanced only in the presence of N2H4, and the fluorescence intensity is positively correlated with the concentration of N2H4; meanwhile, the probe has the characteristics of quick response and near-infrared emission; the fluorescent probe disclosed by the invention has relatively small cytotoxicity and can be applied to detection of HepG2 cell exogenous hydrazine hydrate.

The invention discloses a synthesis process of vitamin C ethyl ether, and belongs to the technical field of vitamin C derivative synthesis. The process comprises the following steps: taking L-ascorbic acid as a raw material, adding acetone, anhydrous cupric sulfate and acetyl chloride, and reacting for 1-2 hours at 38-40 DEG C under the protection of nitrogen to obtain a vitamin C protector; adding alkali, water, an alkylating reagent and absolute ethyl alcohol into the reaction product, reacting for 3 hours at 75-78 DEG C under the protection of nitrogen, and performing reduced pressure distillation to obtain a vitamin C protector etherate; and finally, hydrolyzing by using cationic resin, removing a protecting group, and recrystallizing by using ethyl acetate to obtain the vitamin C ethyl ether. Through the synergistic catalysis of anhydrous cupric sulfate and acetyl chloride, the reaction time is remarkably shortened, and the product purity and yield are improved. Through detection, the product purity is more than 99.5%, the total yield can reach more than 80%, and an efficient and economical method is provided for industrial production of vitamin C ethyl ether.

The invention belongs to the technical field of packaging materials, and particularly relates to a composite film paper material and a preparation method thereof. The composite film paper material comprises a composite film layer and a paper layer, the composite film layer is prepared from the following components in parts by weight: 60 to 70 parts of polylactic acid, 20 to 30 parts of polybutylene terephthalate adipate, 5 to 8 parts of polyether polyol, 5 to 8 parts of esterified hydrophobic fumed silica and 3 to 5 parts of quinoline; the preparation process of the esterified hydrophobic fumed silica comprises the following steps: stirring fumed silica and acetyl chloride, and drying to obtain the esterified hydrophobic fumed silica. The esterified hydrophobic fumed silica, the polylactic acid, the quinoline and the polyether polyol are mixed according to a scientific proportion, and the barrier property of the composite film paper material is remarkably improved by utilizing the hydrophobicity of the esterified hydrophobic fumed silica and a compact structure formed among the components, and meanwhile, the mechanical property of the composite film paper material is not influenced.

The invention discloses piperonyl butoxide and a preparation method thereof. The preparation method comprises the following steps: carrying out mixing reaction on dihydrosassafras oil, acetyl chloride and trioxymethylene in the presence of concentrated hydrochloric acid; after the reaction is finished, chloromethyl material reaction liquid is obtained; mixing and reacting the chloromethyl material reaction liquid with sodium hydroxide and diethylene glycol monobutyl ether to obtain a product containing piperonyl butoxide. According to the preparation method of piperonyl butoxide, the dihydrosassafras oil, acetyl chloride and trioxymethylene are subjected to chloromethylation reaction in the presence of a small amount of concentrated hydrochloric acid, so that the use of a large amount of concentrated hydrochloric acid in the traditional process is avoided, and the problem of waste acid generated in the chloromethylation reaction process is solved; and meanwhile, the content of piperonyl butoxide in the product can be increased, and the content of piperonyl butoxide is ensured to be greater than 98%.

The invention discloses an anti-skid wear-resistant coating, a preparation method thereof and application of the anti-skid wear-resistant coating in a basketball court, and relates to the technical field of coatings. When the antiskid wear-resistant coating is prepared, firstly, epoxy resin is grafted with vinyl diphenylphosphine and then reacts with epichlorohydrin to obtain modified epoxy resin; then, 2, 2 ', 4, 4'-tetrahydroxybenzophenone and chloroacetyl chloride are subjected to a reaction to prepare an ultraviolet absorption monomer, and the aminated titanium dioxide nanosheet, R-1, 1 '-co-2-naphthylamine and the ultraviolet absorption monomer are subjected to a reaction to obtain a modified titanium dioxide nanosheet; finally, the modified epoxy resin, the modified titanium dioxide nanosheets, ceramsite sand, a defoaming agent, a flatting agent, a curing agent and a diluent are mixed to prepare an anti-skid and wear-resistant coating, and the anti-skid and wear-resistant coating is prepared through coating curing of the anti-skid and wear-resistant coating. The prepared anti-skid wear-resistant coating has good anti-skid, wear-resistant, flame-retardant, anti-ultraviolet aging and antibacterial properties.

The invention discloses a method for preparing spermidine. The method comprises the following steps: dissolving oxalyl chloride and a base in a first solvent, slowly adding 4-bromo-1-butylamine hydrobromic acid, and reacting to obtain 2-((4-bromobutyl)amino)-2-oxoacetyl chloride; adding a base to the reaction solvent of the obtained 2-((4-bromobutyl)amino)-2-oxoacetyl chloride, and slowly adding 3-bromo-1-propylamine hydrobromic acid to obtain N 1 ‑(4‑Bromobutyl)‑N 2 ‑(3‑bromopropyl)oxalamide; 1 ‑(4‑Bromobutyl)‑N 2 ‑(3‑bromopropyl)oxalamide, benzylamine and a base are added to a second solvent to react to obtain 8‑benzyl‑1,4,8‑triazacyclododecane‑2,3‑dione; 8‑benzyl‑1,4,8‑triazacyclododecane‑2,3‑dione is added to an acid for hydrolysis to obtain N 1 ‑(3‑Aminopropyl)‑N 1 Benzylbutane-1,4-diamine; N 1 ‑(3‑Aminopropyl)‑N 1 Benzylbutane-1,4-diamine is added to Raney nickel / methanol, and hydrogen is passed through the reaction to obtain crude spermidine, which is then distilled to obtain pure spermidine. The preparation method of the present invention is easy to operate and safe, easy to industrial-scale production, and has a high conversion rate of spermidine and high product purity.

The invention discloses a novel method for synthesizing 3-oxo-1-cyclobutanecarboxylic acid, which comprises the following steps: taking dichloroacetyl chloride or trichloroacetyl chloride as a starting raw material, carrying out elimination reaction in a solvent under the catalytic action of alkali or Zn-Cu, and reacting the obtained dichloroketene intermediate with methyl acrylate in situ to generate 3-oxo-2, 2, 3-trimethyl-1-cyclobutanecarboxylic acid, thereby obtaining the 3-oxo-1-cyclobutanecarboxylic acid. The 3-oxo-1-cyclobutanecarboxylic acid is prepared by using 2, 2-dichloro-1-cyclobutanecarboxylic acid as a raw material, then dehalogenation and hydrolysis reactions are carried out to prepare the 3-oxo-1-cyclobutanecarboxylic acid, the 3-oxo-1-cyclobutanecarboxylic acid is a pure product with the content of 99% or above, and the total yield reaches 50% or above. The synthetic route has the advantages of mild conditions, few byproducts, high yield and environmental friendliness, and is suitable for industrial amplification.

The invention provides a cyclodextrin ionic liquid demulsifier and a preparation method thereof. The demulsifier takes cyclodextrin as a core, and the surface of the demulsifier is grafted with tertiary amine with long-chain alkane through chloroacetyl chloride. The preparation method comprises the following steps: S1, modifying cyclodextrin with chloroacetyl chloride to obtain chloroacetyl chloride modified cyclodextrin; and S2, grafting chloroacetyl chloride modified cyclodextrin by using tertiary amine with long-chain alkane to obtain the cyclodextrin ionic liquid demulsifying agent. The demulsifier has the characteristics of low amount, high efficiency, easiness in degradation, salt resistance, acid resistance, alkali resistance and the like, and has a good demulsification effect on oil-containing wastewater and high oil removal rate.

The invention belongs to the technical field of chemical pharmacy, and particularly relates to a preparation method and application of an impurity of a beta2 adrenal receptor stimulant and M receptor antagonist bifunctional active compound. According to the impurity preparation method of the beta2 adrenal receptor stimulant and M receptor antagonist bifunctional active compound, acetylation of amino is successfully realized by using acetylation reagents such as acetyl chloride and alkali accelerators such as N, N-diisopropylethylamine, then debenzylation is performed through hydrogenation reaction, and the compound shown in the formula I is successfully prepared. Then, through liquid chromatography purification, a high-purity compound as shown in the formula I is obtained, and the raw material medicine as shown in JKN2304 can meet the requirements of reference substances in the research and development process; the technical problem that in the prior art, an impurity synthesis process of a beta 2 adrenal gland receptor agonist and M receptor antagonist bifunctional active compound is lacked is solved.

Belongs to the technical field of pine wood nematode disease prevention and control, and particularly relates to a preparation method and application of a pyrazole-chitosan oligosaccharide derivative. Chloroacetyl chloride serves as an acylating agent, chitosan oligosaccharide is acetylated, and chloroacetyl chitosan oligosaccharide is generated; then, a pyrazole molecule with nematicidal activity is connected to the Cl site of the chloracetyl chitosan oligosaccharide through ammonolysis reaction, and the novel pyrazole-chitosan oligosaccharide derivative is obtained. The derivative has relatively high contact activity on pine wood nematodes, and LC50 of 24 hours and LC50 of 48 hours are 4.814 mM and 4.061 mM respectively; the chitosan oligosaccharide can remarkably inhibit multiple physiological indexes such as movement, feeding and service life of the pine wood nematodes, and is good in stability, low in molecular weight of the chitosan oligosaccharide, good in water solubility, green and environment-friendly, and the plant toxicity is remarkably reduced. The derivative has a good application prospect in the aspect of controlling the pine wood nematode disease and can be applied to prevention and control of the pine wood nematode disease.

The invention relates to a preparation method of a nylon composite material, in particular to a preparation method of a phosphorus-containing ionic liquid modified nylon composite material, which comprises the following steps: reacting pentaerythritol phosphate, chloroacetyl chloride, 1-methylimidazole and sodium hypophosphite to prepare halogen-free [PCMIM] H2PO2 ionic liquid with the following structural formula; then, the [PCMIM] H2PO2 and ADP are compounded, and the modified nylon composite material is obtained through extrusion granulation. The prepared [PCMIM] H2PO2 is a faint yellow liquid at 80 DEG C, the operation is simple, the product conversion rate is high, the environmental pollution is avoided, and the [PCMIM] H2PO2 can improve the flame retardance and mechanical properties of the nylon composite material.

The invention belongs to the technical field of preparation processes of chemical products, and particularly relates to a method for preparing chloroacetyl chloride through a reaction tower and a rectification tower and an integrated tower preparation device. The invention relates to a method for preparing chloroacetyl chloride by a reaction tower and a rectification tower, which comprises the following steps of: metering liquid chloroacetic acid, preheating the liquid chloroacetic acid by a preheater, metering raw material thionyl chloride, gasifying the raw material thionyl chloride in a gasifier, feeding the gasified raw material thionyl chloride into the bottom of a reaction tower, and reacting the raw material thionyl chloride with the chloroacetic acid from the upper part of the reaction tower in the reaction tower, the tower bottom of the reaction tower is heated by a reboiler; and 2, cooling reaction steam from the reaction tower through a tower top condenser, enabling reflux liquid to enter the tower top of the reaction tower for total reflux, carrying out mass transfer and heat transfer on the steam in the reaction tower, extracting from a side line pipeline, and cooling through a side extraction condenser to obtain the finished product chloroacetyl chloride. According to the method for preparing chloroacetyl chloride through the reaction tower and the rectification tower, energy is saved, consumption is reduced, the product quality is stable, and the purity is high; the invention further provides an integrated tower preparation device which is low in investment and high in efficiency.

The invention relates to the technical field of pretilachlor synthesis, in particular to a process for synthesizing pretilachlor through continuous acylation, which at least comprises the following steps: conveying 2, 6-diethyl anilino propyl ether and chloroacetyl chloride into a microchannel reactor for reaction to generate a pretilachlor mixture; the pretilachlor product is prepared by sequentially carrying out flash evaporation treatment, high-temperature treatment, alkali washing treatment and dehydration on the pretilachlor mixture, and compared with a traditional production process, the process flow is simple, and efficient and environment-friendly continuous production of pretilachlor is realized.

The invention discloses a preparation method of antibacterial modified polylactic acid for a packaging material, and belongs to the technical field of functional modification of polylactic acid.The preparation method comprises the steps that an antibacterial barrier type polylactic acid composite material is prepared through ring opening polymerization of an initiator, grafting of antibacterial molecules and blending of montmorillonite, a chlorine-terminated initiator is generated from ethanolamine and chloroacetyl chloride, and the antibacterial modified polylactic acid is prepared; the preparation method comprises the following steps: initiating ring-opening polymerization of L-lactide to form polylactic acid with terminal group activity, covalently grafting terminal group chlorine with an antibacterial modifier through nucleophilic substitution, endowing the polylactic acid with antibacterial property, coupling modified montmorillonite with silane through organic intercalation, and then carrying out melt blending with the modified polylactic acid with antibacterial property to form a layered barrier structure and enhance interface bonding. Therefore, the film has the advantages of high barrier property, high tensile strength, excellent antibacterial activity and good degradability.

The utility model provides an acetoxyacetyl chloride synthesizer which comprises a first synthesis kettle and a second synthesis kettle, the top of the first synthesis kettle and the top of the second synthesis kettle are both communicated with a first metering tank and a second metering tank through pipelines, and the first metering tank and the second metering tank are both provided with feeding pumps. The bottom of the first synthesis kettle and the bottom of the second synthesis kettle are communicated with a rectifying kettle through pipelines, a rectifying assembly is arranged at the top of the rectifying kettle, and a discharge port is formed in the bottom of the rectifying kettle; the whole device is simple in structure, the two synthesis kettles can be alternately used, so that the production efficiency is effectively improved, acidic mixed waste gases such as sulfur dioxide and hydrogen chloride are not generated, the utilization rate of raw materials theoretically reaches 100%, the device completely conforms to an environment-friendly and pollution-free green process, the reaction process is mild, and the production cost is low. The reaction speed can be controlled by controlling the temperature and the catalyst input amount, the production operation is safe, the production cost is low, and the benefit is high.

The invention discloses an on-off type fluorescent probe for detecting Hg < 2 + > as well as a preparation method and detection application thereof, and is characterized in that the chemical structural formula of the on-off type fluorescent probe is as shown in the following formula (I), the preparation method comprises the following steps: mixing N-ethyl carbazole and ZnCl2, adding dichloromethane and acetyl chloride as reaction solvents under the protection of nitrogen atmosphere, and after complete reaction, filtering, washing and drying to obtain the on-off type fluorescent probe for detecting Hg < 2 + >. Adding ammonium acetate and malononitrile into the compound 1, and completely reacting to obtain a compound 2; adding the compound 2 and p-dihydroxy benzaldehyde into ethanol, adding piperidine as a reaction catalyst, completely reacting to obtain a compound 3, adding a Dess-Martin reagent, and completely reacting to obtain a compound 4; finally, dissolving the compound 4 in dichloromethane, adding dithioglycol and boron trifluoride diethyl etherate, and completely reacting to obtain the on-off type fluorescent probe. The method has the advantages that the synthesis difficulty can be reduced, the selectivity is good, and the sensitivity and the accuracy are high.

The invention discloses a novel high-efficiency soil conditioner and its preparation method and application, and belongs to the technical field of soil improvement. The invention is used to solve the problem that the ability of soil conditioners used in saline-alkali land to reduce salt needs to be improved and the efficiency is low in the prior art; wherein the novel high-efficiency soil conditioner is obtained by uniformly mixing octasulfide, humic acid, montmorillonite, potassium sulfate, magnesium sugar alcohol and additives; wherein the preparation method of the additive comprises adding modified polyacrylic acid and modified apatite to acetone, reacting to obtain quaternary ammonium salt grafted apatite; adding bamboo powder to ionic liquid BMIMCl, adding chloroacetyl chloride, stirring, mixing, and obtaining intermediate I; in a nitrogen atmosphere, mixing intermediate I, quaternary ammonium salt grafted apatite and a catalyst, and reacting to obtain the additive under room temperature. The soil conditioner prepared by the present invention can improve soil quality, improve soil structure, enhance soil nutrient retention capacity and promote plant growth, and increase economic value.

The invention discloses a method and system for continuously synthesizing 2, 4-dichloroacetophenone, and the method for continuously synthesizing 2, 4-dichloroacetophenone comprises the following steps: S1, mixing m-dichlorobenzene and a catalyst to form a turbid liquid, and continuously inputting the turbid liquid into a tubular reactor; s2, enabling gas-phase acetyl chloride to pass through a micro-interface generator to form micron-sized microbubbles, continuously inputting the micron-sized microbubbles into a tubular reactor, and carrying out mixed reaction on the micron-sized microbubbles and the turbid liquid to obtain a mixed reaction liquid; and S3, continuously inputting the mixed reaction liquid and water into a hydrolysis reactor, and carrying out hydrolysis and separation to obtain 2, 4-dichloroacetophenone. According to the invention, the traditional kettle type stirring reaction is changed into micro-interface reaction, and the mass transfer area and the total mass transfer rate among multiple phases can be multiplied, so that the reaction rate is greatly improved, the side reaction is effectively controlled, and meanwhile, the product yield, the reaction safety and the like are improved.

The invention discloses a method for preparing methyltriacetoxysilane from acetic anhydride-containing acetyl chloride distillation tailings, and relates to the technical field of organic silicon synthesis, the method comprises the following steps: adding methyl trichlorosilane and acetic anhydride-containing acetyl chloride distillation tailings into a reaction kettle, stirring and heating; after a total reflux condition is reached, maintaining total reflux for a period of time, and then starting to collect acetyl chloride; continuously heating until the collection of acetyl chloride is completed, stopping heating, and when the temperature of the kettle is reduced to room temperature, heating again and starting vacuum negative pressure; when the kettle temperature reaches a set value, stopping heating, stopping stirring, and closing vacuum negative pressure; and after the kettle temperature is reduced to room temperature, adding pretreated activated carbon, carrying out decoloration reaction, and carrying out suction filtration after the reaction is completed, thereby obtaining the product. According to the method, a large amount of acetic anhydride in the acetyl chloride distillation tailings is used as a raw material and directly reacts with methyl trichlorosilane to prepare methyltriacetoxysilane, and the quality of the obtained product is remarkably higher than that of a product prepared by a normal process.

The invention provides photovoltaic support wood, a preparation method thereof, a skid-mounted photovoltaic support comprising the photovoltaic support wood and a photovoltaic tool. The preparation method comprises the following steps that wood raw materials are subjected to first soaking in a hydrogen peroxide aqueous solution, and wood A is obtained; the wood A is soaked in a titanium tetrachloride aqueous solution for the second time, boric acid powder is added into the system, and wood B is obtained; the wood B is subjected to third soaking in a mixed solution D containing glacial acetic acid and acetyl chloride, and wood C is obtained; and the wood C is subjected to hot pressing treatment, and the photovoltaic support wood is obtained. A specially treated wood material is used as a frame of the photovoltaic support, so that high-strength design and quick disassembly and transportation of the skid-mounted photovoltaic support can be realized, and the service life of the photovoltaic support in different environments can be prolonged.

A method for preparing N,N'-diacetyl-L-cystine disodium salt, the method comprising: (i) mixing hydroxyalkane (0.5-100 L, preferably 0.5-10 L, more preferably 1-3 L, most preferably 1 L / mole cystine) with sodium base (4.0 molar equivalents / mole cystine) to form a cold solution at a temperature of 5-10°C; (ii) adding cystine (1 molar equivalent) to the cold solution and stirring for a sufficient time to form an alkaline cystine solution; (iii) optionally cooling the cystine solution to 5°C; (iv) adding acetyl chloride (2 molar equivalents / mole cystine) in batches while maintaining the temperature at 3-50°C, preferably at 5-35°C, more preferably below 10°C, most preferably at 5°C, thereby obtaining a white suspension; (v) stirring the white suspension and warming the suspension to room temperature of 15°C-50°C, preferably at 20-35°C, more preferably 20°C, thereby obtaining N,N'-diacetyl-L-cystine disodium salt product dissolved in solution, and a sodium chloride byproduct precipitated solid in the suspension. This specification discloses an exemplary method on a small laboratory scale (500 mg cystine isolate, 688 mg product, 90% yield) (Specification page 13, Example 1).

The application discloses a method for preparing 3-methoxy-3-methyl-1-butyl acetate, and belongs to the technical field of organic compound synthesis. The method comprises the following steps: taking 3-methoxy-3-methyl-1-butanol as raw material, and respectively adopting acetic acid, acetic anhydride and acetyl chloride as acetylation reagents, and adding a catalyst or an acid-binding agent to perform acetylation reaction, so as to obtain 3-methoxy-3-methyl-1-butyl acetate. The application provides a synthesis method for 3-methoxy-3-methyl-1-butyl acetate, takes 3-methoxy-3-methyl-1-butanol as raw material, respectively adopts acetic acid, acetic anhydride and acetyl chloride as acetylation reagents, adds a catalyst or an acid-binding agent to perform acetylation reaction, and obtains 3-methoxy-3-methyl-1-butyl acetate. In view of the defect that there is no acetylation synthesis process suitable for the target product in the prior art, the related technical blank is filled.

The utility model provides a chloracetyl chloride mixing device, which belongs to the technical field of chloracetyl chloride preparation, and comprises a mixing tank and a limiting component, the top of the mixing tank is provided with a cover plate, the middle of the cover plate is provided with a rotating column, the middle of the rotating column is provided with cross-shaped grooves which are arranged in an up-down array mode, and the middle of each cross-shaped groove is provided with a support. A limiting assembly is arranged in the middle of the support and comprises springs and clamping plates, the springs are arranged in the middles of the two sides of the support, the same clamping plate is arranged at one ends of the springs located on the same side, the size of the clamping plate is equal to that of one end of the cross-shaped groove, and stirring assemblies are arranged on the two sides of the support; according to the utility model, the maintenance convenience of the stirring part can be improved.

The invention provides a synthesis method of L-acetoxypropionyl chloride, and belongs to the field of medical intermediates and fine chemical engineering. The preparation method comprises the following steps: mixing L-lactic acid and acetyl chloride for first reaction; then adding trichlorotoluene and a catalyst to carry out a second reaction; and then rectifying and separating to obtain the product L-acetoxypropionyl chloride. According to the method, two raw materials react to generate two products, no sulfur dioxide or acidic mixed waste gas is generated, the utilization rate of the raw materials reaches 100% theoretically, and the method completely conforms to an environment-friendly and pollution-free green process. The safety of the used trichlorotoluene is far higher than that of thionyl chloride and phosgene, the reaction is mild, the reaction speed can be controlled by controlling the temperature and the input amount of the catalyst, the production operation is relatively safe, and the purity of the prepared L-acetoxypropionyl chloride product is greater than 99%, and the yield is greater than 90%.

The invention discloses a qualitative and quantitative analysis method for polyolefin oxidation products, and belongs to the technical field of polyolefin oxidation product analysis. The method comprises the following steps: collecting a headspace gas phase product of a reaction kettle through an air bag and injecting an internal standard substance; filtering or centrifuging to remove the catalyst in the kettle bottom to obtain reaction liquid; removing the solvent by adopting a rotary evaporation technology to obtain a concentrated polyolefin oxidation product; and carrying out methyl ester derivatization treatment on the concentrated product by using a methanol solution of acetyl chloride as an esterification reagent, fixing the volume of the derivatization product to a certain volume, and adding an internal standard substance to obtain a liquid sample to be detected. Carrying out qualitative analysis on the liquid product by using GC-MS to reveal the molecular structure of the liquid product; gC-FID is used for quantitative analysis, and the product yield is calculated through an effective carbon number method. And carrying out quantitative analysis on a gas phase product through GC-TCD. The invention provides an efficient and accurate technical means for qualitative and quantitative analysis of polyolefin oxidation products, and further promotes the progress of a plastic recovery technology.

The invention discloses a preparation process of 2-chloro-4-(methylsulfonyl)-3-methyl benzoic acid, and relates to the technical field of preparation of inorganic compounds. The invention relates to a preparation process of 2-chloro-4-(methylsulfonyl)-3-methyl benzoic acid, which comprises the following steps: reacting 3-chloro-2-methylaniline with hydrochloric acid and sodium methyl mercaptide to form an intermediate C1, reacting with acetyl chloride, catalyzing with anhydrous aluminum trichloride to form an intermediate C2, reacting with hydrogen peroxide and sodium hypochlorite to form an intermediate C4, and reacting with sodium chloride to form the 2-chloro-4-(methylsulfonyl)-3-methyl benzoic acid. The 2-chloro-4-(methylsulfonyl)-3-methyl benzoic acid is obtained after the reaction is completed.

The invention discloses an NPA aldehyde-free water-based acrylic emulsion and a preparation method thereof, which belongs to the technical field of water-based coatings and is used to solve the technical problems that the water-based acrylic emulsion prepared in the prior art has poor self-thickening property, poor coating film density, and cannot effectively absorb formaldehyde. In the NPA aldehyde-free water-based acrylic emulsion prepared by the invention, polyamino o-aminobenzoic acid and polyhydroxy phenyl glycidyl ether for absorbing formaldehyde are added. O-aminobenzoic acid (NPA) is chlorinated with chloroacetyl chloride and substituted with ethylenediamine in sequence to obtain polyamino o-aminobenzoic acid; o-aminobenzoic acid is modified with phenyl glycidyl ether to obtain polyhydroxy phenyl glycidyl ether. In addition, the invention compounds acrylic monomers and alkyd resins, and compound functional monomers and crosslinking agents, thereby significantly improving the adhesion, viscosity and coating film density of the prepared NPA aldehyde-free water-based acrylic emulsion.

The invention relates to the technical field of refining of high-purity boric acid, and particularly discloses a method for removing divalent metal ions in high-purity boric acid, which comprises the following steps: dissolving the high-purity boric acid in water, filtering, adsorbing by adsorbent resin, filtering to obtain a refined boric acid solution, cooling, crystallizing, evaporating, crystallizing, carrying out suction filtration, and crushing to obtain the refined boric acid. The preparation method of the adsorption resin comprises the following steps: (1) blending polystyrene master batches with acetyl chloride, dispersing, and adding Lewis acid for reaction to obtain acetylated polystyrene particles; and (2) dispersing acetylated polystyrene particles, mixing with p-aminobenzene arsenic acid to react, filtering, and washing with alcohol to obtain the adsorption resin. After the high-purity boric acid is treated by the adsorbent resin prepared by the invention, the purity of the high-purity boric acid can reach 99.99%, and the effect of removing divalent metal ions in the high-purity boric acid can be realized.

This invention relates to the field of dichloroacetic acid preparation technology, specifically a method for preparing high-purity dichloroacetic acid. The method uses anhydrous dichloroacetic acid alkyl ester or anhydrous dichloroacetyl chloride as a single raw material. The method includes: adding deionized water to a corrosion-resistant reactor, starting stirring and cooling to 10-30°C, adding the single raw material and an acidic catalyst, reacting at 40-80°C for 1-8 hours, and then refining through multi-stage separation to obtain high-purity dichloroacetic acid. The anhydrous dichloroacetic acid alkyl ester is selected from methyl dichloroacetate, ethyl dichloroacetate, propyl dichloroacetate, or isopropyl dichloroacetate. The acidic catalyst is a ZrO₂-TiO₂ supported acid solid catalyst or a complex liquid organic acid catalyst.