114results about "Oxygen-containing compound preparation" patented technology

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 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.

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 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.

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.

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.

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 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.

The present invention relates to a novel method for isolating capsanthin and several other carotenoids from paprika oleoresin, a concentrated extract of paprika fruit (Capsicum annuum). In another aspect, the invention relates to the use of mild non-aqueous and aqueous saponification methods for isolating highly pure capsanthin and other carotenoids from paprika oleoresin at temperatures of about 20-50°C. In another aspect, the invention relates to a saponification method that results in a crystalline mixture of capsanthin, β-carotene, β-cryptoxanthin, and zeaxanthin, which can be separated by solvent extraction and crystallization to obtain highly pure capsanthin and other carotenoids.

The invention provides an olefine aldehyde intermediate and a synthetic method thereof, and a synthetic method of conopomorpha sinensis sex pheromone, and belongs to the field of compound synthesis. According to the synthesis method of the olefine aldehyde intermediate, provided by the invention, 1, 5-pentanediol is taken as a raw material, and the high-yield olefine aldehyde intermediate is obtained through transesterification, first oxidation reaction, Wittig reaction and Sagsa oxidation reaction; the yield of the olefine aldehyde intermediate can be further improved by limiting a catalytic system and an auxiliary agent of the Sagsa oxidation reaction. Results of the embodiment show that the synthesis method provided by the invention does not adopt alkyne compounds, the yield of the product in the Sagassa oxidation reaction stage can reach 81%, the total yield of the obtained olefine aldehyde intermediate can reach 48.5%, the sex pheromone of conopomorpha sinensis prepared by adopting the olefine aldehyde intermediate can reach 39.8%, and the yield is high.

The present invention provides a metal oxygen-containing complex, which comprises a transition metal element as central atom and an oxygen-containing heterocyclic organic compound containing a substituent as ligand; the ligand is a compound having a structure shown in formula (I).

To suppress reduction of yield of monomers.SOLUTION: Polyester and reaction solvent which reacts with polyester are introduced into a reactor to depolymerize polyester, and the reactor has reaction part including: a circulation part having a plurality of first flow channels which extends from an introduction port into which reaction solvent, from which first depolymerized polyester being depolymerized polyester is extracted, is introduced, and to a lead-out port from which reaction solvent, from which second depolymerized polyester being further depolymerized first depolymerized polyester is extracted, is lead-out; and a resistor which is provided at a position of covering the outlet port of the circulation part, and in which a second flow channel allowing reaction solvent to circulate in the first flow channel is formed, where the resistor has higher pressure loss than the circulation part.SELECTED DRAWING: Figure 3

The invention provides a method for depolymerising a phenolic polymer, the method comprising reacting the phenolic polymer with dimethylsulphoxide (DMSO) and a hydrogen halide. The phenolic polymer may be selected from the group consisting of lignin and derivatives thereof. The hydrogen halide may be HBr. The quantity of hydrogen halide per gram of phenolic polymer may be from 30 mmoles to 70 mmoles. The quantity of DMSO per gram of phenolic polymer may be from 0.1 mole to 1 mole. The reaction may be performed at a temperature of from 100 to 120 °C. The reaction may be carried out for between 10 h and 14 h. The product of the reaction may comprise vanillin.

The present invention relates to the technical field of azeotrope energy-saving separation, and provides a separation method for energy-saving and consumption-reducing of a dimethyl carbonate and methanol azeotrope, comprising the following steps: S1. After preheating, the first azeotrope of dimethyl carbonate and methanol is fed into the first distillation column, heated and pressurized, and the second azeotrope of dimethyl carbonate and methanol is taken out from the top of the column, and the remaining third azeotrope of dimethyl carbonate and methanol at the bottom of the column is fed into the second distillation column; S2. The second distillation column is heated and pressurized, and the fourth azeotrope of dimethyl carbonate and methanol is taken out from the top of the column, and the remaining fifth azeotrope of dimethyl carbonate and methanol at the bottom of the column is fed into the refining column; S3. After the third azeotrope and the fourth azeotrope are heat-exchanged through a heat exchanger, they are fed into the second distillation column. Through the above technical solution, the problem in the prior art that a large amount of steam is consumed in separating the azeotrope by pressure-variable two-column distillation is solved.

To appropriately obtain terephthalic acid from DMT, while suppressing energy consumption.SOLUTION: A hydrolysis reaction system includes a reaction vessel where dimethyl terephthalate and water are supplied, dimethyl terephthalate is hydrolyzed by water to produce terephthalic acid and methanol, a discharge device for expelling a mixture of methanol and water from the reaction vessel, and a control device for controlling the discharge system. The control device does not allow the mixture to be discharged from the discharge device during the first period, which is from the time dimethyl terephthalate and water are supplied to the reaction vessel until the first timing. Then, during the second period from the first timing to the second timing, which is after the first timing, the control device allows the mixture to be discharged, and from the second timing until terephthalic acid is derived from the reaction vessel, in the third period, the mixture is not discharged from the discharge device. The first period is shorter than the third period.SELECTED DRAWING: Figure 3

The present invention relates to compounds of formula (I) as perfume precursor compounds. In particular, the present invention relates to a method for releasing a compound of formula (I) that is a carbonyl of formula (II), a formate of formula (III), and / or an alcohol of formula (IV) by placing the compound of formula (I) in an environment where it is oxidized. Furthermore, the present invention relates to perfume compositions and consumer perfume products containing at least one compound of formula (I).

This invention belongs to the field of biomedicine and discloses olive oil ceramide, which is obtained by reacting olive oil fatty acids with sphingosine compounds selected from sphingosine, phytosphingosine, and dihydrosphingosine. This invention also discloses a synthesis method and uses of olive oil ceramide. Olive oil ceramide exhibits excellent properties in repairing the skin's natural barrier, anti-inflammatory, tissue healing, and anti-aging, and has broad application prospects in cosmetics, health products, biopharmaceuticals, and other fields.