148results about "Oxygen-containing compound preparation" patented technology

The present invention relates to novel iminoamide-type compounds of the general formula (I) and use thereof as ligands in copper-catalyzed coupling reactions of (hetero)aryl halides forming C-C, C-N, C-S, C-O, C-P-bonds and other bonds, in particular the use of the compounds of formula (I) as ligand in copper-catalyzed coupling reactions of aryl halides forming C-O-bonds.

The invention discloses a synthesis method of 2, 4, 5-trifluorophenylacetic acid, which comprises the following steps: by taking cheap and easily available o-chloronitrobenzene as a raw material, reacting with sodium nitrate in a sulfuric acid and trifluoroacetic acid system, separating generated 2, 4-dinitrochlorobenzene through melt crystallization, and continuing to synthesize 2, 4-dinitrochlorobenzene in methyl chloroacetate to obtain 2, 4, 5-trifluorophenylacetic acid. The method comprises the following steps: carrying out indirect aromatic nucleophilic substitution reaction on 2, 4-dinitrophenylacetic acid under the condition of sodium hydride to generate 5-chloro-2, 4-dinitrophenylacetic acid methyl ester, separating, carrying out fluorination reaction on the 5-chloro-2, 4-dinitrophenylacetic acid methyl ester and potassium fluoride under the action of a phase transfer catalyst, carrying out rectification separation to obtain 2, 4, 5-trifluorophenylacetic acid, and carrying out hydrolytic acidification on the 2, 4, 5-trifluorophenylacetic acid in a sodium hydroxide aqueous solution to obtain 2, 4, 5-trifluorophenylacetic acid. And the process route is safer, more environment-friendly, more efficient and lower in cost.

The invention discloses a recovery process of waste PET (polyethylene glycol terephthalate), which comprises the following steps: dissolving waste PET by using a good solvent, dropwise adding into cold methanol, precipitating, filtering, separating, drying, and hydrolyzing the waste PET by using a low-concentration sodium hydroxide aqueous solution, so that the PET can be effectively hydrolyzed at a relatively low temperature (25-40 DEG C), the reaction conditions are mild, the reaction time is short, the yield is high, and the recovery process is suitable for industrial production. The yield of the product TPA is up to 99%, the product TPA is easy to separate, and the solvent can be recycled.

The invention discloses a method for depolymerizing polyester. The method comprises forming a polyester comprising the following components (a), (b) and (c): (a) a polyester, (b) one or more basic compounds selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, alkali metal bicarbonate salts, alkaline earth metal hydroxides, alkaline earth metal carbonates and alkaline earth metal bicarbonate salts, and (c) and a step of depolymerizing the polyester in the mixture of a solvent containing at least one of an alcohol-based solvent and a ketone-based solvent. The temperature of the mixture at the time when the mixture containing the total amount of the polyester, the basic compound, and the solvent is formed is 75 DEG C or less. The ratio of the amount of the polyester to the amount of the solvent is 0.2-20 by mass.

The present invention relates to a method for producing terephthalic acid in an environmentally friendly manner using waste polyester. In particular, according to one embodiment of the present invention, the method for producing terephthalic acid includes the steps of (1) subjecting waste polyester to alcoholysis using C4 or higher alcohol to produce a liquid composition containing the compound represented by formula 1, and (2) subjecting the liquid composition to hydrolysis, and thus can produce terephthalic acid in an environmentally friendly manner, improve processability, and reduce process costs.

The invention provides a preparation method of unsaturated fatty acid, which obviously reduces the residual amount of dioxin in grease through tromethamine treatment, effectively separates EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) through magnesium acetate precipitation, and improves the cycle use frequency of silver nitrate cycle use liquid through stannous chloride treatment and alkaline alumina treatment. And the unsaturated fatty acid separation capability of the silver nitrate recycling liquid is maintained.

To provide a method for producing a cyclohexanedicarboxylic acid-based compound which can simply obtain a cyclohexanedicarboxylic acid-based compound such as DMCD from a polymer having a terephthalic acid skeleton at a sufficient yield at low cost.SOLUTION: A method for producing a cyclohexanedicarboxylic acid-based compound includes performing exchange reaction of an ester group or an amide group and alcohol or water in the presence of a catalyst A, and nuclear hydrogenation reaction in the presence of the catalyst A and a nuclear hydrogenation catalyst B, on a polymer having a terephthalic acid skeleton containing an ester group or an amide group, and thereby obtaining a cyclohexanedicarboxylic acid or a cyclohexanedicarboxylic acid ester, wherein the catalyst A containing at least one selected from Group 2 elements (excluding strontium) and Group 3 elements, and the nuclear hydrogenation catalyst containing at least one selected from a catalyst containing ruthenium, and a platinum-carrying catalyst in which platinum is carried on silica are used.SELECTED DRAWING: None

Depolymerization of polyalkylene terephthalate resin using Alcosilis, providing a superior depolymerization method. [Solution] The method for depolymerizing a polyalkylene terephthalate resin according to the present disclosure is a method for depolymerizing a polyalkylene terephthalate resin by alcoholization of the polyalkylene terephthalate resin, wherein the polyalkylene terephthalate resin includes a polybutylene terephthalate resin, and the alcohol used for alcoholization contains tetrahydrofuran in a proportion of more than 0 ppm by mass and 100,000 ppm or less by mass.

The present invention provides a method for asymmetric synthesis of cyclobutane derivatives. Compound 2 and PhBpin are used as substrates, and are mixed with a catalyst, a ligand, an additive, an oxidant, a base, water, and a solvent for reaction to generate a target compound 1. The reaction formula is as follows: wherein R 1 The present invention forms a chiral complex by using a chiral α-amino spirocyclic ligand and a Pd(II) center, thereby achieving high yield and high enantioselectivity and providing a new approach to the asymmetric synthesis of cyclobutane derivatives.

The invention relates to a method for synthesizing (R)-3-methylheptanoic acid. According to the method, the application range of steroid sapogenin degradation waste is further expanded. According to the method disclosed by the invention, the (R)-3-methyl-heptanoic acid can be conveniently obtained by taking the (R)-4-methyl-gamma-butyric acid lactone obtained by degrading steroid sapogenin as a raw material. According to the method provided by the invention, the use of highly toxic and controlled reagents is avoided, high-risk reactions such as hydrogenation in the prior art are avoided, and the method is mild in reaction condition and low in synthesis cost. Meanwhile, the utilization rate of steroid sapogenin resources is increased, and waste generated in the utilization process of the steroid sapogenin resources is reduced.

The present invention discloses an auxiliary material feeding device for glycerol production, which relates to the field of glycerol processing. It includes a reaction tank, wherein vegetable oil and sodium hydroxide solution are poured into the interior of the reaction tank. A stepping motor is arranged at the top of the adjusting plate, and an output end of the stepping motor is provided with a telescopic shaft mechanism. The telescopic shaft mechanism is connected to a lifting mechanism, and an activated carbon stirring disk is arranged on the telescopic shaft mechanism. Activated carbon balls are hung on the activated carbon stirring disk. In the present invention, the activated carbon balls to be treated are placed inside the arc-shaped blades. The activated carbon balls inside the arc-shaped blades are thrown out from the ports of the arc-shaped blades under the action of centripetal force, and the arc-shaped blades will stir the activated carbon balls to move in the solution and adsorb pigments. When the stirring disk rotates in the reverse direction, the arc-shaped blades will expand away from the stirring disk, and the activated carbon balls will penetrate through the storage port and enter the interior of the arc-shaped blades for re-collection and salvage.

The invention discloses a butyl-containing waste liquid treatment method, and belongs to the technical field of chemical engineering, the method comprises the following steps: converting 1-chlorobutane into n-butyl alcohol through alkaline resin, hydrolyzing n-butyl acetate in an alkaline reagent to obtain n-butyl alcohol, and then recovering high-purity n-butyl alcohol through extractive distillation; according to the method, the n-butyl alcohol is efficiently recovered from the waste liquid and returns to the front end again to serve as a raw material to be input, and the resin and the extraction agent used in the method can be recycled; and the treated waste liquid is simple to treat and low in cost, so that the production cost of preparing glufosinate-ammonium is reduced, the pollution to the environment is reduced, and the method has very high industrial application value.

To achieve high-yield recovery of dicarboxylic acids and diols, which are polyester monomers, from a polyester composition containing an acrylic component and / or a silicone component.SOLUTION: The present invention provides dicarboxylic acid and / or diol obtained by a process that involves hydrothermally decomposing a polyester composition including an acrylic component and / or a silicone component and a polyester component, at 180°C or more and 350°C or less in the presence of an alkaline component.SELECTED DRAWING: None

The invention discloses hump conjugated linoleic acid, a hump conjugated linoleic acid microcapsule and a preparation method and application of the hump conjugated linoleic acid microcapsule, and belongs to the technical field of deep processing of hump fat. According to the method, petroleum ether is used as a solvent, crude fat is extracted from hump fat through a Soxhlet extraction method, NaOH-ethanol is used for saponifying the crude fat, then a low-temperature crystallization method is combined with a urea adduction method, and finally, the conjugated linoleic acid is effectively separated and purified. The determination of the free radical scavenging ability of DPPH and ABTS shows that the obtained CLA has oxidation resistance. Extracted and purified conjugated linoleic acid is used as a core material, whey protein isolate and maltodextrin are selected as wall materials, an emulsion is prepared, and microcapsule powder is prepared by a direct vacuum freeze-drying method. Experiments show that the prepared conjugated linoleic acid microcapsule has a complete structure and good thermal stability.

To improve the recovery rate of alcohol, which is a constituent monomer of polyester resin, in a method for decomposing polyester resin using high-temperature water. [Solution] A method for decomposing polyester resin, comprising step (i) of hydrothermally treating polyester resin in the presence of polyamide resin, wherein step (i) includes proceeding with hydrolysis of the polyester resin at a temperature of 150°C or higher.

The present invention provides, inter alia, a process for preparing a compound of formula (I) wherein the substituents are as defined in claim 1. JPEG2025515043000048.jpg33159

The invention relates to novel salts of N-substituted 2-amino-4-methylpyrimidine-5-yl-carboxylic acids having the formula (I), where the values of the radicals are disclosed in the claims, and the use of said salts as a growth stimulator for plants and fungi. The invention further relates to embodiments of methods for producing N-substituted 2-amino-4-methylpyrimidine-5-ylcarboxylic acids having the formula (I). The technical result is the production of novel salts of N-substituted 2-amino-4-methylpyrimidine-5-yl-carboxylic acids having the formula (I) which exhibit improved plant growth stimulator properties.

The present invention proposes a synthetic method for 8-oxo-2,2,14,14-tetramethylpentadecanedioic acid, the method comprising: (1) adding water and lithium hydroxide to a reaction vessel, heating and stirring until clarified; (2) adding a mixed solution containing 8-oxo-2,2,14,14-tetramethylpentadecanedioic acid diethyl ester and dimethyl sulfoxide to a container; (3) stirring the reaction solution obtained in the previous step and heating to a predetermined temperature, insulating and stirring for a predetermined time, so as to obtain the 8-oxo-2,2,14,14-tetramethylpentadecanedioic acid. Utilizing the method of the present invention, 8-oxo-2,2,14,14-tetramethylpentadecanedioic acid can be efficiently synthesized, and the product purity is high, the impurities are few, and the yield is high. In the post-processing process, there is no need to refine with an organic solvent such as methyl tert-butyl ether, which is more environmentally friendly, safe, reduces production costs, simplifies operation, and is suitable for industrialized large-scale production.

A growth inhibitor for forming a thin film, a method for forming a thin film using the same, and a semiconductor substrate prepared therefrom are disclosed. The growth inhibitor is represented by Chemical Formula 1 [AnBmXo]. In the Chemical Formula 1, A is carbon or silicon, B is hydrogen or a C1-C3 alkyl, X is a halogen, n is an integer from 1 to 15, o is an integer of 1 or more, and m is from 0 to 2n+1. Side reactions are suppressed to appropriately lower a thin film growth rate and remove process byproducts in the thin film, thereby preventing corrosion or deterioration and greatly improving step coverage and thickness uniformity of a thin film even when the thin film is formed on a substrate having a complicated structure.

The invention relates to a method for removing heavy metals in borneol. Specifically, the invention provides a method for reducing the content of heavy metals in borneol, and the method comprises the following steps: (1) mixing a borneol crude product with an organic solvent to obtain a borneol crude product solution; and (2) adding propolis and activated carbon into the borneol crude product solution obtained in the step (1), stirring, filtering, concentrating the filtrate under reduced pressure, crystallizing and filtering the obtained concentrated solution, and drying the obtained solid to obtain the borneol pure product, thereby reducing the content of heavy metals in the borneol. The method provided by the invention can effectively reduce the content of heavy metals such as arsenic, lead, mercury, cadmium and copper in the borneol, so that the heavy metals in the borneol can be effectively controlled, and the application value of the borneol is improved.

[Problem] To provide a method for recycling a polyester-containing substance by a new means. [Solution] The method for recycling a polyester-containing substance comprises a step in which the polyester-containing substance is subjected to alcoholysis in a solvent in the presence of a catalyst and an alcohol and a step in which an alcoholysis product obtained in the above-mentioned step is isolated. Specifically, the method is performed using a device including a tank for holding a polyester-containing substance therein and a tank and / or a path for isolating a product of alcoholysis of the polyester.

This invention provides a novel method for manufacturing fluorinated carboxylate compounds, for producing formula (P1): (B 1f ) mp (A) 1 ) np [B] 1f RfCOO; Rf is a hydrocarbon group having one or more fluorine atoms; A 1 It is a group other than H; mp is (A 1 The valence of () × np and is 1 or 2; np is mp / (A 1 The valence of A is 1; 1 The method of manufacturing a compound having a valence of 1 or 2 includes: making formula (S1): (B 1f (R) 1 ) [R 1 The compound shown is an organic group and is related to formula (S2): (A 1 ) ms2 (B) 2 ) ns2 [B] 2 It is OH, CO3 or HCO3; ms2 is (B 2 (valence) × ns2 / (A) 1 The valence of ns is 1 or 2; ns2 is (A 1 (value) × ms² / (B) 2 The reaction of the compound or its hydrate shown in the figure (with a valence of 1 or 2) is a step A.

The application discloses a polyester degradation method. Specifically, the polyester degradation method comprises the following steps: degrading the polyester under the action of a carboxylic acid and a catalyst, namely, the polyester is degraded; the polyester comprises repeating units formed by a dibasic carboxylic acid and a dihydric alcohol; and the catalyst is a Lewis acid and / or a sulfonic acid organic acid. The degradation method has wide application range, the obtained product dicarboxylic acid is simple to separate and can be used for resynthesis of the polyester, the catalyst can be recycled and reused, the obtained product dihydric alcohol dicarboxylic acid ester can be reduced by hydrogenation to form a carboxylic acid, and the carboxylic acid and the catalyst in the degradation solution are repeatedly used for degradation of the polyester, so that the industrial benefits of the polyester degradation are maximized.

To obtain 1,4-butanediol and / or terephthalic acid in high yield in solvolysis of polyethylene terephthalate.SOLUTION: A method of producing terephthalic acid and / or 1,4-butanediol includes a process of carrying out solvolysis of polyethylene terephthalate or a composition thereof in the presence of an alkali metal salt and / or an alkali earth metal salt of pKa>4.0, and water in a temperature range including a temperature of 180 to 350°C, where a total mol number of a mol number of an alkali metal atom of the alkali metal salt and / or the alkali earth metal salt of pKa>4.0 and a mol number of two times the mol number of an alkali earth metal atom to one mol of terephthalic acid unit in the polybutylene terephthalate is 1.5 to 6.0 mol.SELECTED DRAWING: None

To provide: a growth inhibitor for thin film formation capable of suppress side reactions to lower a thin film growth rate and remove process by-products in the thin film, thereby greatly improving step coverage and thickness uniformity of a thin film even when the thin film is formed on a substrate having a complicated structure; a thin film formation method using the same; and a semiconductor substrate with the thin film formation method.SOLUTION: This invention relates to a growth inhibitor for forming a thin film, a method for forming a thin film using the same, and a semiconductor substrate prepared therefrom. More specifically, this invention relates to a growth inhibitor for forming a thin film comprising a compound represented by Chemical Formula 1 below, AnBmXo [Chemical Formula 1] (where A is carbon or silicon, B is hydrogen or a C1-C3 alkyl, X is a halogen, n is an integer of 1 to 15, o is an integer of 1 or more, and m is 0 to 2n+1.); a method for forming a thin film using the same; and a semiconductor substrate prepared therefrom.SELECTED DRAWING: Figure 2

The application discloses a preparation method of 2-ethyl-2-methyl pentanoic acid, wherein in the process of preparing a key intermediate 2-cyanopentanoate (compound B), compound A is removed by using an alkali extraction method, high-purity compound B is separated by using rectification (a yield of 20% and a purity of 98%), and the operation process is simple. In the preparation method, reagents used are sodium methoxide, sodium hydroxide, sulfuric acid, sodium hydride and sodium nitrite, the reagents are simple, the danger is relatively small, and the experimental operation is relatively safe. In the preparation method, the post-treatment processes of alkylation, hydrolysis, deacidification and cyano hydrolysis do not use a chromatographic column purification process, and a conventional extraction distillation operation is adopted, so that the output of unit volume of instrument equipment is high.

The invention discloses two halogenated tetraphenylethylene derivative fluorescent probes as well as a synthesis method and application thereof. The synthesis method of the halogenated tetraphenylethylene derivative fluorescent probes 2FH2L and 2BrH2L comprises the following steps: preparing a compound B from a compound A, dissolving the compound B in a mixed solvent of THF, methanol and water dissolved with LiOH for hydrolysis, acidizing, and carrying out suction filtration and drying on the precipitate to obtain the product 2FH2L. The preparation method comprises the following steps: brominating a compound C to prepare a compound D, dissolving the compound D in a mixed solvent of THF, methanol and water in which NaOH is dissolved, hydrolyzing, acidizing, and carrying out suction filtration and drying on the precipitate to obtain the product 2BrH2L. The fluorescence property of the halogenated tetraphenylethylene derivative shows a remarkable AIE effect under different solvent proportions, strong fluorescence emission is shown in a poor solvent, and the halogenated tetraphenylethylene derivative can be used as an efficient fluorescence probe capable of detecting Cu < 2 + > through the characteristics of the halogenated tetraphenylethylene derivative.

The present invention discloses a water-soluble Janus aromatic hydrocarbon compound and a preparation method thereof. The structural formula Ι of the compound is: wherein, R is COOH or COO ‑ ; the compound is a supramolecular host with a back-to-back double-bowl structure, having a cavity size of nanometer scale, with a diameter of 1.6 nm and a depth of 0.6 nm, and there are 36 carboxylate anions or 36 carboxylic acids on the molecule, having good solubility in water, forming a self-assembled body with a stable structure in the aqueous phase, the particle size of the formed assembly is 383 nm, and the particle size of the assembly can also be regulated by changing the concentration, and it is expected to be applied in the fields of molecular recognition and biomimetic catalysis, etc.

The utility model belongs to the technical field of separation, and particularly relates to an ethyl acetate and butanone separation device, which comprises a butanone separation tower, an ethanol separation tower and an ethyl acetate separation tower which are connected in sequence, in the utility model, the tower top produced liquid of the ethyl acetate separation tower returns to the butanone separation tower, so that the purity of the product can be further improved; the gas phase of the butanone separating tower is used as a heat source of a reboiler at the bottom of the ethyl acetate separating tower, the gas phase at the top of the ethyl acetate separating tower is used as a heat source of a reboiler at the bottom of the ethanol separating tower, heat coupling can be realized between the rectifying towers with different operating pressures, the energy consumption in the rectifying and separating process is further reduced, and the method has higher operability.