647results about "Carboxylic compound preparation" patented technology

The invention discloses an oxidation kettle and a method for preparing an isocaprylic acid intermediate product sodium isocaprylate, the oxidation kettle comprises a kettle body and a jacket fixedly sleeved outside the circular outer part and the bottom end of the kettle body, a sealing seat is arranged at the center of the top end of the kettle body, a speed reducer is fixed at the top end of the sealing seat through a flange and a screw, and a speed reduction shaft of the speed reducer penetrates through the sealing seat; a speed reducer is arranged in the kettle body, the top end of the speed reducer is in transmission connection with a stirring motor, the stirring motor is electrically connected with an external power supply through an electric wire, and a stirring shaft is vertically arranged at the center of the kettle body. According to the device, the stirring effect on fluid in the kettle body can be enhanced through automatic up-down swinging of the metal stirring rollers, synchronous swinging of the multiple stirring rollers is achieved through the linkage mechanism, stable and controllable swinging action is ensured through the driving mechanism, the mixing uniformity and reaction efficiency of materials in the oxidation kettle are remarkably improved, and the production cost is reduced. And the stirring requirements of high-viscosity and easily-layered materials are met. The oxidation kettle can be used for preparing an isocaprylic acid intermediate product sodium isocaprylate.

Acrolein is produced by selectively oxidizing allyl alcohol over a first mixed metal oxide catalyst in the presence of oxygen in the vapor phase. The first mixed metal oxide catalyst comprises oxides of molybdenum and bismuth. Acrylic acid is produced by selectively oxidizing the acrolein over a second mixed metal oxide catalyst in the presence of oxygen in the vapor phase. The second mixed metal oxide catalyst has a different composition from the first mixed metal oxide catalyst.

The invention relates to the technical field of equipment temperature control, in particular to a 12-hydroxystearic acid production reaction temperature control method based on artificial intelligence, and the method comprises the following steps: calculating a reaction heat release index based on the hydrogen feeding instantaneous molar flow at the current moment so as to represent theoretical heat generated through chemical reaction in unit time; based on the output power of the stirring motor at the moment and fluid mechanics characteristics, a viscosity correction factor used for representing the heat transfer capacity attenuation degree caused by the material viscosity change is constructed; in combination with the reaction heat release index and the viscosity correction factor at the current moment, performing energy compensation and nonlinear correction on the actually measured temperature in the kettle at the current moment to obtain a target predicted temperature; the control of the 12-hydroxystearic acid production reaction temperature is realized based on the target predicted temperature at the current moment, and the accuracy of the control of the 12-hydroxystearic acid production reaction temperature can be effectively improved.

The present invention relates to a method for decomposing peracetic acid using a metal compound and a method for culturing microorganisms using the decomposition method. The cultivation of microorganisms using the method of the present invention allows an effective removal of the peracetic acid used in a culture medium for sterilization.

The application discloses a kind of ruthenium grafting manganese aluminum hydrotalcite and catalytic method for C02 hydrogenation preparation formic acid, belong to catalyst technical field, in the application, under the optimized reaction condition, with methanol:water mixture as solvent (5:1), total pressure is 60bar, 60 DEG C, reaction 24 hours, with temperature controller to be heated to the temperature required for reactor.When the temperature inside the reactor reaches the specified temperature, start stirring at a fixed stirring speed (200-800 revolutions / min), after the required reaction time, stop stirring and heating, and allow the reactor to cool to room temperature. The hydrogenation products were analyzed by high performance liquid chromatography, the conversion number (TON) of formic acid reached more than 8000; RuMnAl-LDH was prepared by coprecipitation method, and RuMnAl hydrotalcite catalyst was obtained by heating and activation in a muffle furnace. The preparation process is simple, and the raw materials are easy to obtain. The RuMnAl-LDH catalyst prepared by the application has good catalytic activity and stability in the catalytic hydrogenation of formic acid to formic acid reaction, and has wide application prospect.

The invention belongs to the field of organic synthesis, and particularly relates to a method for preparing trimesoyl chloride in an immobilized catalysis mode. An immobilized catalyst is used as an acyl chloride reaction catalyst, thionyl chloride and benzene tricarboxylic acid are used as raw materials, and direct boiling reflux reaction is performed under the condition of not introducing other solvents; after the reaction is finished, filtering out the catalyst, and terminating the reaction; and then carrying out reduced pressure distillation to remove excessive reactant thionyl chloride, and then carrying out vacuum distillation to obtain the product trimesoyl chloride. By adopting the immobilized catalyst and taking the raw material as the reaction solvent, the method has the characteristics of mild reaction, simple process, high reaction speed, high product purity, high product yield and the like. And the immobilized catalyst and the reactant thionyl chloride can be recycled, so that the cost is saved, the reaction tail gas is easy to treat, the environmental pollution is not easily caused, and the method is suitable for industrial production. The final product is trimesoyl chloride, the purity can reach 99.2% or above, and the yield reaches 92% or above.

The present application relates to a kind of preparation method of vicinal diol compound, which comprises the following steps: in non-aqueous solvent, formula (I) compound and reducing agent are reacted under light condition, to obtain the vicinal diol compound shown in formula (II);The reducing agent is formic acid or formate;The wavelength of the light is less than 390nm;Its reaction formula is as follows.The preparation method of the present application does not need transition metal catalyst, also does not need other special catalyst and special additive, and the aldehyde ketone substrate can be reacted with formic acid or formate in solvent by specific wavelength of light, to obtain corresponding vicinal diol compound with high yield, its reaction condition is mild, has wide substrate applicability, and green and environmental protection, simple and practical operation method, provides an effective synthesis strategy for the synthesis of shikimic alcohol compound.

The present application relates to a method for liquid phase oxidation of durene, which comprises: a first stage, in the presence of a catalyst, with acetic acid as a solvent, a liquid phase oxidation reaction of an oxidant source and durene to produce an intermediate mixture, the catalyst containing Co salt, Mn salt, Zr salt and bromide compound; a second stage, adding a mixture of bromide and pure water to the intermediate mixture, and continuing the oxidation reaction with the oxidant source to produce pyromellitic acid; wherein the concentration of oxidant in the oxidant source of the first stage is lower than the concentration of oxidant in the oxidant source of the second stage. By controlling the concentration of oxidant in the oxidant source of the first stage to be lower than the concentration of oxidant in the oxidant source of the second stage in the liquid phase oxidation process of durene, the yield of pyromellitic acid and the purity of crude pyromellitic acid are significantly improved.

To provide a polylactic acid decomposition method capable of decomposing polylactic acid into lactic acid, while suppressing generation of lactic acid amide, capable of ready circular reuse of ammonia used in the decomposition of polylactic acid, and capable of efficient operation of a treatment system of polylactic acid.SOLUTION: A method of decomposing polylactic acid to produce lactic acid, in which a polylactic acid decomposition step is performed in which polylactic acid is impregnated into a treatment solution containing ammonia and lactic acid to decompose. An ammonia concentration is 29 μmol / ml or more and 534 μmol / ml or less in the treatment liquid at the time of polylactic acid decomposition, and the lactic acid concentration in the treatment liquid is 266 μmol / ml or more.SELECTED DRAWING: Figure 1

The invention discloses a monatomic loaded lignin carbon-based photocatalyst as well as a preparation method and application thereof. The preparation method of the photocatalyst comprises the following steps: S1, grinding and blending lignin and melamine, then adding the mixture into water, transferring the obtained solution into a hydrothermal reaction container, reacting at 175-195 DEG C for 4-10 hours, and after the reaction is finished, cooling at room temperature, washing and centrifugally separating to obtain a solid mixture; s2, dispersing the solid mixture in an aqueous solution containing metal salt, stirring at room temperature, and drying after the reaction is finished; and S3, putting the dried solid into a container, putting the container into a pyrolysis reactor, heating to 800-1000 DEG C in an argon atmosphere, pyrolyzing for 2-6 hours, and naturally cooling to obtain the monatomic loaded lignin carbon-based photocatalyst. The monatomic loaded lignin carbon-based photocatalyst provided by the invention can efficiently catalyze glucose to synthesize glucaric acid under mild conditions, and the obtained target product is relatively high in yield and easy to separate, and has a very good industrial application prospect.

This application provides a method for recycling polystyrene. Under light irradiation, polystyrene and an oxidant undergo an oxidative depolymerization reaction in the presence of graphite-phase carbon nitride to generate oxidation products. The oxidant is selected from oxygen or air. The method provided in this application utilizes graphite-phase carbon nitride as a catalyst to recover polystyrene, achieving high-value-added conversion of polystyrene with high conversion rate and high selectivity. The oxidation products include high-value-added chemical products benzoic acid, acetophenone, and benzaldehyde, as well as the byproduct CO. x The yield can reach over 95%, and the total selectivity of the oxidation products for high-value-added chemical products benzoic acid, acetophenone, and benzaldehyde can reach over 75%. The catalyst used in this application is highly stable, inexpensive, easy to synthesize, and easy to recover and separate. The method provided in this application is simple, safe, has a high reaction rate, and low reaction cost, making it an environmentally friendly method for recovering polystyrene.

The invention relates to the technical field of chemical engineering, and discloses a method for improving the chromaticity and purity of acetic anhydride based on a reflux ratio, and the method comprises the following steps: optimizing an evaporation tower, an acetic acid rectifying tower and an acetic anhydride rectifying tower, and installing an online detection instrument and an automatic control valve to construct an intelligent rectification control system; evaporating the crude acetic anhydride by using the optimized evaporation tower to obtain crude acetic anhydride steam; feeding the crude acetic anhydride steam into an acetic acid rectifying tower, calculating an initial reflux ratio, inputting the initial reflux ratio into a control system, and starting a reflux system to preliminarily remove acetic acid; monitoring the acetic acid content through an online gas chromatograph, and finely adjusting the reflux ratio until the reflux ratio reaches the standard when the measured acetic acid content is higher than a target value; feeding the crude acetic anhydride reaching the standard into an acetic anhydride rectifying tower, calculating an initial reflux ratio, inputting the initial reflux ratio into a control system, and starting to obtain an intermediate product; monitoring chromaticity and purity through an on-line platinum-cobalt colorimeter and an on-line gas chromatograph, and updating the reflux ratio to be qualified according to a bivariate adjustment formula; and finally, carrying out all-item detection on a finished product, and locking reflux ratio parameters after confirming that the finished product is qualified.

The invention discloses a synthesis method of 4-bromo-3-(ethoxymethyl) benzoic acid, which comprises the following steps: (1) activating carboxyl of p-bromobenzoic acid serving as a raw material in the presence of an organic anhydride activator, and then performing chloromethylation reaction with paraformaldehyde in the presence of a chlorine-containing Lewis acid catalyst to obtain 4-bromo-3-(ethoxymethyl) benzoic acid; after the reaction is completed, carrying out post-treatment to obtain an intermediate 4-bromo-3-(chloromethyl) benzoic acid; and (2) carrying out nucleophilic substitution reaction on the intermediate obtained in the step (1) in ethanol under the action of inorganic alkali to prepare the target product 4-bromo-3-(ethoxymethyl) benzoic acid. According to the invention, through one-pot activation and chloromethylation of p-bromobenzoic acid, concise, efficient and highly economical synthesis from cheap raw materials to the sparsentan key intermediate is realized.

The invention provides a photocatalytic method for degrading polystyrene into benzoic acid, which comprises the following steps: dissolving polystyrene in a mixed solvent containing acetonitrile and chlorobenzene, adding a catalyst FPQL-OMe and iron trifluoromethanesulfonate, and reacting under the conditions of oxygen atmosphere and illumination to generate benzoic acid, wherein the FPQL-OMe and the iron trifluoromethanesulfonate are synergistically used as a photocatalyst. The invention provides a method for photocatalytic degradation of polystyrene, which is mild in condition, rapid, efficient and high in selectivity, and particularly provides a photocatalytic method for degrading and converting polystyrene into benzoic acid at a relatively high yield.

The invention discloses a process method for continuous synthesis of MMA (methyl methacrylate) in a Mo-Bi-Fe multi-metal oxide catalyst system by taking isobutene as a unique C4 raw material. The method comprises the following steps: firstly, carrying out selective oxidation on isobutene into methylacrolein on a Mo-Bi-Fe catalyst under the conditions that the temperature is 320-360 DEG C and the pressure is 0.10-0.25 MPa (absolute pressure) by combining segmented oxygen supply with steam coverage regulation and control and cooperating with molten salt isothermal heat exchange; then selectively oxidizing methylacrolein into methacrylic acid on a Mo-V-(Te / Nb / W / P) composite oxide catalyst under the conditions that the temperature is 260-290 DEG C and the pressure is 0.10-0.25 MPa (absolute pressure) through matching of axial temperature partitioning and segmented oxygen feeding; and in a continuous esterification system in which reactive distillation and pervaporation or membrane distillation are coupled, performing esterification and continuous water removal under the conditions that the temperature of a tower kettle is 65-85 DEG C and the pressure in the tower is 0.08-0.15 MPa (absolute pressure) by taking strong-acid cation exchange resin as a catalyst, so as to obtain an MMA finished product. According to the method, high selectivity and low chromaticity are realized under industrial load, the MMA purity is greater than or equal to 99.90 wt%, and the water content is less than or equal to 30ppm.

The invention relates to the technical field of organic synthesis, and discloses a synthesis method of fatty acyl chloride, which is characterized in that fatty acid and oxalyl chloride are used as raw materials and are subjected to temperature control reaction in an organic solvent under the action of a composite catalyst to prepare the fatty acyl chloride. Through the synergistic catalysis of the composite catalyst, the reaction activation energy is remarkably reduced, the reaction time is shortened, and the acylation reaction selectivity is improved; meanwhile, reaction process parameters are optimized, the problems of raw material waste and complicated post-treatment caused by excessive oxalyl chloride in a traditional method are avoided, and the product yield and purity are relatively high. The method is easy and convenient to operate, mild in condition, environmentally friendly, suitable for acylating chlorination reaction of straight-chain or branched-chain fatty acid and capable of achieving large-scale industrial production.

The application discloses a kind of palladium-doped Co3O4 Nanosheet and its preparation method, and specifically discloses its application in photocatalytic reduction CO2 production acetic acid.The application is synthesized by using hydrothermal method first four cobalt oxide, then adding palladium source to the alkaline dispersion liquid of four cobalt oxide, and stirring to make it react, and successfully prepares palladium-doped four cobalt oxide nanosheet.The palladium-doped four cobalt oxide nanosheet prepared by the application is applied to the reaction of photocatalytic reduction carbon dioxide, which can greatly improve the catalytic reduction efficiency of CO2, and the product of photocatalytic reduction carbon dioxide is acetic acid.The application uses palladium-doped four cobalt oxide nanosheet to photocatalytic reduction carbon dioxide, and the yield of product acetic acid can be as high as 14 μmol / g / h, which is much higher than that of undoped four cobalt oxide nanosheet (3 μmol / g / h).

The application relates to a catalyst for catalytically synthesizing propylene acid from propane and application thereof, and the catalyst is represented by the following general formula: Mo a V b Te c Nb d Ni e O x Wherein, a, b, c, d and e respectively represent the atom numbers of Mo, V, Te, Nb and Ni, and the molar ratio of a:b:c:d:e is 7.0-9.0:1.7-2.5:1.0-1.5:1.7-2.3:0.1-1.0, and the value of x is determined by the oxidation state of each element; Ni is introduced by nickel molybdate, Mo is introduced by a molybdate and the nickel molybdate, and the nickel molybdate is prepared by co-precipitation of a molybdate and a nickel salt in the presence of an organic acid. According to the application, the content of different valence metals on the surface of the catalyst can be adjusted by introducing nickel into the catalyst through nickel molybdate, so that the content of high-valence elements Mo 6+ , V 5+ and Ni 2+ in the catalyst and the oxygen vacancy are increased, and the redox capacity of the catalyst is enhanced.

The present invention relates to processes to obtain methyl (E)-2-[2-halomethyl)-3-methyl- phenyl]-3-hydroxy-prop-2-enoates and intermediates thereof. These compounds are used as intermediates for preparing strobilurin type compounds for combating phytopathogenic fungi containing an amino acid substitution F129L in the mitochondrial cytochrome b protein (also referred to as F129L mutation in the mitochondrial cytochrome b gene) conferring resistance to Qo inhibitors.

The invention provides a method for preparing alpha, omega-binary acid by decommissioning polyolefin cracking based on stage oxidation, which comprises the following steps: in the absence of a catalyst or in the presence of a catalyst, mixing decommissioning polyolefin with water to form a dispersion system, and reacting at the temperature of 100-200 DEG C and the partial pressure of oxidant gas of 0.1-5.0 MPa to prepare alpha, omega-binary acid. The method comprises the following steps: introducing oxidant gas into a high-pressure closed reactor, carrying out a stirring reaction to obtain small-molecular carboxylic acid, carrying out oxidation treatment on the small-molecular carboxylic acid by using nitric acid to obtain alpha, omega-dibasic acid with a carbon atom number of 4-10, and efficiently preparing high-purity alpha, omega-dibasic acid with a carbon atom number of 4-10. And [omega]-binary acid.

The invention relates to a method for producing a catalyst, involving the process of thermally treating one or more powders P or one or more shaped geometric precursor bodies so as to form one or more catalytically active multielement oxides, the one or more catalytically active multielement oxides being treated with a liquid after the thermal treatment, optionally filtered, and dried.

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

The present invention provides a process for Pd(II) -catalyzed site selective β- and γ-C(sp3)-H arylation of primary aldehydes controlled by transient directing groups.

The invention particularly relates to a molybdenum-bismuth-iron catalyst, a preparation method and application thereof and an olefin oxidation method. The general formula of the catalyst component is MoBiaFebXcYdZeQf (Bi4Ti3O12) gOj, wherein X is at least one of an alkaline earth metal element and a group VIII metal element; y is at least one of a VB group metal element, a VIB group metal element and a VA group metal element; z is at least one of alkali metal elements; q is at least one of rare earth elements; the value of a ranges from 0.01 to 0.05; the value of b ranges from 0.1 to 0.5; the value of c ranges from 0.2 to 0.8; the value of d is 0.1 to 0.5; the value of e ranges from 0.01 to 0.03; the value of f ranges from 0.01 to 0.04, and the value of g ranges from 0.5 to 3; and j is the total number of oxygen atoms required for meeting the valence of each element in the catalyst. The molybdenum-bismuth-iron catalyst disclosed by the invention has relatively high reaction activity, can effectively improve the reactant conversion rate, the product selectivity and the target product yield, is particularly suitable for being applied to oxidation reaction, and is particularly suitable for being applied to olefin oxidation.

A process and system for extracting maleic anhydride from a gaseous mixture where the gaseous mixture is contacted with an extraction solvent capable of absorbing maleic anhydride at temperatures between about −60° C. and 250° C. and at pressures up to about 50 psi above atmospheric pressure.

To provide a process for forming arylcyclopropylcarboxylic acids useful for forming molecules having insecticidal applications against pests in the phyla Arthropoda, Mollusca, and Nematoda.SOLUTION: There is provided an enantiomerically enriched preparation of the compound (R2, R4) - 3 - (3, 5-bis (trifluoromethyl) phenyl) - 2, 2-dichlorocyclopropane-1-carboxylic acid in a heterogeneous S3a, wherein CF3 and R3 are; R2, and R5 are H; and R7 and R8 are Cl; wherein the enantiomeric excess of the (R, R) - enantiomer of the is greater than 80%, greater than 90% or greater than 95%. 1R 3R S3a. Also provided are pesticidal formulations comprising said enantiomerically enriched preparations.SELECTED DRAWING: None

The invention belongs to the technical field of catalysts, and discloses a nanorod-like Keggin type heteropolyacid catalyst and a preparation method and application thereof, the nanorod-like Keggin type heteropolyacid catalyst has a double rod-like structure, and the double rod-like structure is a rod-like structure with the length of 50-150 nm and a rod-like structure with the length of 3-10 [mu] m. The heteropolyacid catalyst has the characteristics of large specific surface area, double rodlike structure and the like, and the reaction performance of the catalyst for preparing methacrylic acid by oxidizing methylacrolein can be optimized.

The application relates to the technical field of organic synthesis, and discloses a preparation method of a hydrocarbyl carboxylic acid, which comprises the following steps: mixing a hydrocarbyl aldehyde, an oxidizing agent and a first metal salt to perform pre-reaction, and then mixing the reaction system obtained through the pre-reaction with a second metal salt to perform reaction; wherein the first metal salt is selected from at least one of a sodium salt, a potassium salt, a calcium salt, a lithium salt, an iron salt and a copper salt; and the second metal salt is selected from at least one of a zinc salt, a manganese salt, a cobalt salt, a palladium salt and a silver salt. The preparation method of the hydrocarbyl carboxylic acid can greatly shorten the reaction time, and improve the raw material conversion rate, the target product selectivity and the target product purity of the aldehyde oxidation acid reaction.

The invention relates to the technical field of chemical engineering, and discloses a rectification optimization process for improving the quality of acetic anhydride, the process realizes efficient pre-removal of high boiling impurities and colored substances in crude acetic anhydride by optimizing the structure of an evaporation tower, adopting combination of falling film evaporation and filler reinforcement, and accurately controlling the operation parameters of vacuum degree, temperature and feeding amount, so that the quality of the acetic anhydride is improved, and the quality of the acetic anhydride is improved. A traditional tower plate of the acetic acid rectifying tower is replaced with the efficient float valve tower plate, the internal part structure of the efficient float valve tower plate is optimized, the gas-liquid mass transfer efficiency in the rectifying tower is improved, and efficient and stable separation of acetic acid and acetic anhydride is achieved through precise linkage control over temperature and reflux ratio rectifying parameters. The main content of the product is improved; the impurity content is reduced; through whole-process online monitoring and regular optimization iteration in combination with a process parameter-product quality database, dynamic regulation and control and continuous improvement of the production process are realized, and finally the beneficial effects that the main content of acetic anhydride in the product is greater than or equal to 99.65% and the chromaticity is less than or equal to 6 are achieved.