463results about "Preparation by hydrolysis" patented technology

The present invention relates to a process for preparing a carboxylic acid from a hydrolysable polymer containing the carboxylic acid, comprising at least the following process steps: i) depolymerizing the polymer by hydrolyzing the polymer in an aqueous hydrolysis solution to form a carboxylic acid salt and optionally at least one further monomer component of the polymer; ii) optionally removing other monomer components and any other soluble and / or insoluble impurities from the hydrolysate solution produced in process step i); iii) transferring the hydrolysate solution produced in process step ii) to the anode chamber of the electrolysis device; iv) electrolyzing in the anode chamber using the hydrolysate solution, the electrolyzing device having, in addition to the anode chamber, a cathode chamber filled with a liquid, by connecting the electrolyzing device to a voltage source, a current flowing through the electrolyzing device and ion exchange in the liquid between the anode chamber and the cathode chamber, whereby the liquid in the cathode chamber becomes alkaline, and the liquid in the anode chamber becomes alkaline; protons are formed in the anode chamber, so that carboxylate is protonated, and carboxylic acid is precipitated; and v) removing the formed carboxylic acid from at least part of the hydrolysate solution, in which vi) the liquid generated in the cathode chamber of the electrolysis device in the process step iv) is used as a component of the hydrolysate solution in step i).

Methods for upgrading heavy aromatic waste streams, such as polystyrene, to chemical feedstocks are disclosed. The process involves feeding waste streams to a first pyrolysis zone followed by hydrogenation. The hydrogenation effluent is processed to recover ethylene, propylene, benzene, ethylbenzene, or their precursors. Optionally, the effluents are separated into light and heavy streams. The light stream from the first pyrolysis effluent is sent to hydrogenation, while the heavy stream is either removed, recycled to the first pyrolysis zone, or fed to a second pyrolysis zone. The light stream from the hydrogenation effluent is processed to recover the same chemicals, and the heavy stream is similarly managed. If present, the second pyrolysis effluent is separated into light and heavy streams, with the light stream processed to recover chemicals and the heavy stream managed as before.

The invention belongs to the technical field of recycling of waste blended textiles, and particularly discloses a method for converting waste blended textiles into ethylene glycol and 1, 4-cyclohexanedicarboxylic acid, which is characterized in that under the action of a multifunctional solid acid catalyst and H2, the waste blended textiles are simultaneously depolymerized and converted into micromolecular chemicals, and the micromolecular chemicals are recycled. Compared with an existing method for depolymerizing and utilizing a single component in the waste blended textiles, the method has the advantages that simultaneous depolymerizing and utilizing of multiple components in the waste blended textiles are achieved, the method is few in process step, high in economic benefit, simple in actual operation and environmentally friendly, the energy consumption in the waste blended textile recycling process is reduced, and the recycling cost is reduced. And meanwhile, the side reaction and subsequent separation cost is reduced, and the process economy is improved.

The invention discloses a novel injection containing edaravone and high-purity synthesized (+)-2-borneol, because the (+)-2-borneol is prepared by a chemical synthesis process, the curative effect of the (+)-2-borneol is better than that of natural borneol and (+)-2-borneol extracted from the natural borneol under the same dosage, the toxic and side effects can be reduced, and the product quality is more stable; and the established GC-MS analysis method can more accurately control the content of each coexisting substance and better guarantee the shelf life quality. The injection is more suitable for improving the treatment effect on central nervous system diseases, oxidative stress injuries such as diabetes, retinopathy, diabetic peripheral neuropathy and neurodegenerative diseases and thrombus-related diseases.

The invention relates to a method for purifying and recovering monoethylene glycol (MEG) from a solution obtained by depolymerizing at least one polyester having at least one MEG unit. The solution is preferably obtained from enzymatic depolymerization of polyethylene terephthalate (PET) contained in a plastic article under alkaline conditions. The invention also relates to a process for recycling and recovering the monomers of a polymer-containing material (e.g., a plastic article) comprising at least one polyester (e.g., PET) having at least one MEG unit.

The invention relates to a regeneration treatment method and application of a degradable high polymer material, and the regeneration treatment method comprises the following steps: degrading the degradable high polymer material in a system in which an organic nonmetal catalyst and a water-containing solvent exist to obtain a degradation product; wherein the degradable high polymer material comprises one or more of a polyester material and a polycarbonate material; the organic nonmetal catalyst is selected from one or more of diphenyl phosphate, binaphthol phosphate and organic alkali. By adopting the specific organic non-metal catalyst, efficient degradation of the degradable high polymer material can be realized, the degradation speed is high, the conversion rate is high, the reaction yield is high, and the cost is low; degradation products can be effectively utilized again as valuable chemicals.

The invention discloses a separation method and application of CBDO cis-trans isomers, and relates to the technical field of compound isomer separation. The separation method comprises the following steps: respectively modifying hydroxyl groups of cis-CBDO and trans-CBDO to generate polarity difference, then separating the two isomers by a solvent dissolution-crystallization method, and finally removing protection to respectively obtain the cis-CBDO isomer and the trans-CBDO isomer. Through a modification protection-separation-deprotection method, the method has the advantages that the method is simple, the separation cost is reduced, and CBDO products with different cis-trans ratios and all-trans CBDO isomers can be obtained; the cis-trans ratio of the CBDO product can be up to 39.5 / 1, and compared with the commercially available CBDO, the copolyester prepared by using the CBDO product under the same condition has higher intrinsic viscosity and glass transition temperature, and the copolyester product with a full cis form can be obtained, so that the application range of the polymer can be expanded.

The present invention discloses a method for preparing a hydroxy-deuterated linear alcohol. The method uses a carbonate as a substrate and heavy water as a deuterium source to carry out a deuteration reaction in the presence of a base catalyst to obtain the hydroxy-deuterated linear alcohol. The method achieves a high degree of deuteration, a high yield, and produces only CO2 as a byproduct.

The invention discloses a method for preparing monopotassium phosphate from potassium phytate and the monopotassium phosphate, relates to the technical field of preparation of the monopotassium phosphate, and aims to solve the technical problems of poor quality, low yield and complex process of the monopotassium phosphate prepared from the potassium phytate in the prior art. The method for preparing monopotassium phosphate from potassium phytate comprises the following steps: obtaining a potassium phytate solution containing calcium and magnesium ion impurities; hydrolyzing the potassium phytate solution under the condition that the pH value is 5-7 to obtain hydrolysate, and filtering the hydrolysate at 50-65 DEG C to obtain filtrate and a filter cake; adding phytic acid hydrolysate into the filtrate to adjust the pH value to 3.0-3.8, and performing chromatographic separation on the filtrate to obtain a monopotassium phosphate phase and an inositol phase; concentrating the monopotassium phosphate phase until the solid content is 55-65wt%, filtering, and drying a filter cake to obtain a monopotassium phosphate product without calcium and magnesium ions. The technical scheme provided by the invention is used for preparing monopotassium phosphate.

The invention relates to the field of chemical separation and purification, in particular to a method for separating a tetrahydrofuran / methanol / water mixture through reactive extractive distillation. Comprising the following steps: water reactive distillation separation, tetrahydrofuran extractive distillation or low-pressure extractive distillation separation, and methanol extractive distillation separation. Heat exchange is carried out between the water reactive distillation tower or the methanol extractive distillation tower and the tetrahydrofuran extractive distillation low-pressure tower, so that partial heat integration is realized; wherein in the reactive distillation tower, water and ethylene oxide react to generate ethylene glycol with high utilization value. After a dimethyl sulfoxide material flow serving as an extracting agent at the bottom of the methanol extractive distillation tower flows out, the dimethyl sulfoxide material flow can flow back to the tetrahydrofuran extractive distillation tower or the tetrahydrofuran extractive distillation low-pressure tower after being cooled by a cooler and supplemented with the extracting agent. The molar purity of ethylene glycol obtained through separation can reach 99.9% or above, the molar purity of tetrahydrofuran and methanol can reach 99.5% or above, the product recovery rate is high, the process is simple, and energy consumption is low.

The invention provides a method for preparing secondary alcohol by using Fischer-Tropsch olefin and C < 5 + > secondary alcohol. The method comprises the following steps: S1, mixing a Fischer-Tropsch olefin raw material and formic acid according to a molar ratio of 1: (0.5-5.0) to obtain a mixed product; s2, introducing the mixed product into a resin catalyst, and carrying out esterification reaction to obtain an ester product; and S3, mixing the ester product with water according to a molar ratio of 1: (1.0-5.0), and carrying out a hydrolysis reaction to obtain the secondary alcohol. According to the method, Fischer-Tropsch olefin is taken as a raw material, formic acid which is easy to recover is introduced as an intermediate substance of reaction, limitation of chemical equilibrium of olefin hydration is broken through, an esterification product is obtained, then hydrolysis reaction is carried out, and a secondary alcohol product is finally prepared with high olefin conversion rate and secondary alcohol selectivity.

The invention is suitable for the technical field of fine chemical engineering, and provides a method for catalytically synthesizing 1, 2-diol by using a titanium silicalite molecular sieve, which comprises the following steps: preparing methanol, a hydrogen peroxide solution and an alkaline additive into a homogeneous mixed solution, mixing the homogeneous mixed solution with a raw material olefin in a mixing tank, pumping into a fixed bed reactor, and carrying out a titanium silicalite molecular sieve catalytic epoxidation reaction to obtain 1, 2-diol. A 1, 2-alkylene oxide solution is generated; the method comprises the following steps: separating a 1, 2-alkylene oxide solution, recycling a substrate olefin and a solvent methanol, and carrying out hydration reaction on 1, 2-alkylene oxide and water in a fixed bed reactor under the action of an ion exchange resin catalyst to generate 1, 2-diol; and feeding the hydration product into a rectifying tower, and carrying out dehydration and impurity removal to obtain a high-purity odorless 1, 2-diol product. The method has the advantages of high product yield, no odor, inhibition of impurity generation, improvement of the product quality, simplification of the production process, no environmental pollution and realization of green production.

The invention discloses an organic compound 1, 3, 6, 8-tetra (m-aniline) pyrene, a one-dimensional covalent organic framework and a preparation method and application thereof, and belongs to the field of materials. The one-dimensional covalent organic framework is prepared by taking 1, 3, 6, 8-tetra (m-aniline) pyrene (3-Py-NH2) as a building block and reacting the building block with 2, 2 '-bipyridine-5, 5'-diformaldehyde (Bpy-CHO). The one-dimensional covalent organic framework is constructed based on a linear photosensitizer element, serves as a novel one-dimensional covalent organic framework material and a photocatalyst, and has the capacity of generating an acidic H2O2 synthesis system. The method is used for synthesizing the ethylene glycol through light-heat one-pot series connection, and a light-heat series connection catalysis strategy for preparing the ethylene glycol through one-pot ethylene oxide is provided for the first time.

The invention provides an alcohol ether polymer, a preparation method thereof and a cutting fluid containing the alcohol ether polymer. The alcohol ether polymer comprises a polymer as shown in a general formula I, a is 3-5, and b is 0-2. When the alcohol ether polymer provided by the invention is added into the crystalline silicon cutting fluid, in the silicon wafer preparation process, the wire breakage rate is low, the smudginess rate is low, the TTV of the silicon wafer is small, and the yield is high.

The present application relates to a diacetylene compound represented by formula (I), or a pharmaceutically acceptable salt thereof, a pharmaceutical composition comprising same, and a use of the compound, the pharmaceutically acceptable salt thereof, and the pharmaceutical composition. The compound, or the pharmaceutically acceptable salt thereof and the pharmaceutical composition comprising same can be used for preparing a drug for treating or relieving neuroinflammation and neurodegenerative diseases.

The invention discloses a supercritical decoloration and degradation coupling system and method for a waste dyed PET (Polyethylene Terephthalate) foam material. Aiming at the problem that two functions of decoloration and degradation cannot be realized in the same set of system at one time in the past, firstly, carbon dioxide and a cosolvent are introduced into a reactor filled with a PET (Polyethylene Terephthalate) foam material in a supercritical state for decoloration, and complete decoloration of the PET foam material can be realized under proper conditions. After the decoloration is finished, methanol is introduced into the reactor to circularly flow, the decolorized PET foam material is subjected to an alcoholysis reaction in a subcritical / supercritical state, and a high-purity degradation product can be obtained through post-treatment. According to the system and the method, two-step reaction of decoloration and alcoholysis is completed in one set of system at one time, the system and the method have the advantages of simple process, small equipment investment, high reaction efficiency, high product quality, low operation cost, continuous production and the like, a new way is provided for purification, recovery and high-quality utilization of the waste dyed PET foam material, and the concept of sustainable development is met.

The invention discloses a preparation method and application of titanium silicalite porous water, and belongs to the field of materials. The preparation method comprises the following steps: S1, calcining titanium silicalite TS-1; s2, adding the calcined titanium silicalite TS-1 into water, sealing, and carrying out ultrasonic treatment to obtain a milk white concentrated solution; s3, centrifuging the milky white concentrated liquor to obtain supernate, repeating the operation, discarding the supernate after the last centrifugal cycle to obtain precipitated titanium silicalite TS-1, and dispersing the precipitated titanium silicalite TS-1 in water to obtain the titanium silicalite porous water. The preparation method is simple and easy to implement, and titanium silicalite porous water can be synthesized on a large scale. The titanium silicalite porous water is applied to photo-thermal tandem catalytic synthesis of ethylene glycol, can improve adsorption of oxygen and ethylene and promote mass transfer of the oxygen and the ethylene in water, and more importantly, the titanium silicalite porous water can enable a TS-1 catalyst to be uniformly dispersed, so that photo-physical and photo-chemical processes of the photocatalyst are regulated and controlled, and synthesis of ethylene glycol is promoted.

The invention relates to the field of resin catalysts, and discloses a hydration catalyst, a preparation method and application thereof, and an epoxy compound catalytic hydration method. The catalyst comprises a molded molecular sieve carrier and ion exchange resin loaded on the carrier, the structure of the catalyst is shown as formula (I), in # imgabs 0 # formula (I), # imgabs 1 # is a molded molecular sieve, # imgabs 2 # is a styrene copolymerization matrix, R1, R2 and R3 are respectively and independently alkyl, and M <-> is an anion. The hydration catalyst has excellent swelling resistance and good temperature resistance.

The invention belongs to the technical field of organic synthesis, and particularly discloses a method for synthesizing carveol hydrate by using 2, 3-epoxy pinane, which comprises the following steps: by using 2, 3-epoxy pinane as a raw material, adding deionized water in a solvent in the presence of organic phosphoric acid as a catalyst and a micro-channel reactor as reaction equipment, carrying out ring-opening rearrangement reaction on the 2, 3-epoxy pinane to obtain carveol hydrate. Under the combined action of the catalyst and the microchannel reactor, high-yield and high-purity carveol hydrate is obtained; the method is mild in reaction condition, simple and convenient to operate, capable of effectively avoiding violent heat release of epoxy ring opening and generated by-products, high in reaction efficiency and good in industrial application prospect, the product yield can reach 98%, and the content can reach 99%.

The invention relates to a method for recycling a side reaction product in production of 3-amino-1-adamantanol, belonging to a technical method for recycling and utilizing a nitration side reaction product in a process of producing a medical intermediate 3-amino-1-adamantanol. In the neutralization-alkalization operation of nitration reaction mixed acid liquor in the production process of 3-amino-1-adamantanol, a segmented adjustment operation mode is adopted, a nitration reaction termination material is neutralized and adjusted to the optimal pH range of 5-7, and nitration side reaction products are separated out, separated and purified. And then carrying out pressurized (0.05-0.1 MPa) high-temperature (more than 100 DEG C) reaction on the separated nitration side reactant in a mixed water solution of strong inorganic alkali (sodium hydroxide or potassium hydroxide) and organic alkali (pyridine), so that the nitration side reactant is converted into 1, 3-adamantanediol. The target product 1, 3-adamantanediol is separated and collected through subsequent operations such as evaporation concentration, cooling crystallization, separation crystallization and the like.

The invention relates to a process for obtaining isobutene from an isobutene containing C4-hydrocarbon mixture (1) in a plant comprising an etherification unit (3), a first distillation unit (5), an ether cleavage unit (10) and a second distillation unit (12), the process comprising: (a) contacting the C4-hydrocarbon mixture (1) with a primary alcohol (2) and reacting the mixture with the primary alcohol in the presence of an acidic catalyst to form the corresponding alkyl tert-butyl ether in the etherification unit (3); (b) distilling the reaction mixture (4) from the etherification unit (3) in the first distillation unit (5), a C4-hydrocarbon raffinate being withdrawn as the overhead product (6), and the alkyl tert-butyl ether being withdrawn as the bottom product (7); (c) vaporizing the bottom product from the first distillation unit (5) in an evaporator (8) obtaining a vapor stream (9); (d) reacting the vapor stream (9) of step (c) in the presence of an acidic catalyst obtaining isobutene and the primary alcohol as reaction products in the ether cleavage unit (10); (e) distilling the reaction mixture (11) from the ether cleavage unit (10) in the second distillation unit (12), isobutene being withdrawn as the overhead product (13), the primary alcohol and diisobutene being withdrawn as the bottom product (14) and being recycled to the etherification unit (3); wherein a purge stream (15) containing high boiling components with a normal boiling point higher than that of the alkyl tert-butyl ether is withdrawn from the evaporator (8) in step (c).

The invention relates to a process for recovering NaOH, polyester monomers, dyes and byproducts in an alkaline depolymerization liquid agent generated by a depolymerization reaction of polyester in a mixed textile. The process comprises: concentrating a liquor solution into a mixture comprising water, solid NaOH, dye and other liquid products; extracting ethylene glycol from the mixture; solid NaOH is dissolved; recovering the solid dye; and recovering terephthalic acid.

A system and method for producing ethylene glycol are disclosed. An alkylene oxide and water are fed into a first reactor unit, and the alkylene oxide and water are subjected to first reaction conditions in the first reactor unit such that the effluent from the first reactor unit contains an alkylene glycol, unreacted alkylene oxide, and unreacted water. At least a portion of the unreacted alkylene oxide can be routed to a second reaction unit and subjected to reaction conditions sufficient to produce further alkylene glycols.

The present invention relates to a depolymerization method of a polyurethane mass, preferably, thermoset polyurethane. The method comprises four main steps: i) mixing the polyurethane mass with a depolymerization reaction medium comprising an ionic liquid in a proportion equal to or greater than 50% w / w with respect to the total weight of said medium, a superbase as a catalyst, and a nucleophilic agent in a proportion equal to or less than 15% w / w with respect to the total weight of said medium, subjecting said mixture to a temperature between 50-100°C for a time comprised between 2 minutes and 10 hours; ii) adding a mass of a protic molecular solvent in an amount between 4 and 40 times more the weight of the depolymerization reaction medium; iii) subjecting the mixture of step ii) to a temperature between 20-60°C for at least 1 hour; and iv) separating the fractions obtained in step iii); namely, a semisolid fraction comprising at least a polyol mass for reuse in the synthesis of a new polyurethane, and a single-phase liquid fraction comprising at least the ionic liquid and the basic catalyst, for their reuse in a new process for polyurethane depolymerization.

The invention belongs to the technical field of organic synthesis. The invention particularly relates to a synthesis method of chiral beta-diaryl ethanol. The physiological activity, the pharmacological action and the material performance of the chiral molecule are directly determined by the spatial configuration of the chiral molecule. Therefore, efficient construction of chiral compounds is always the core research direction of organic synthesis and medicinal chemistry. Wherein the chiral beta-diaryl ethanol is a kind of key intermediates with irreplaceable application value. According to the invention, the Suzuki-Miyaura type asymmetric ring-opening coupling reaction of nickel catalyzed aryl epoxy and aryl boric acid with high stereoselectivity is realized, and the asymmetric ring-opening coupling reaction is used for synthesizing chiral beta-diaryl alcohol compounds. The method is wide in substrate compatibility and raw material source, mild in reaction condition, free of exogenous alkali and convenient to operate. An aryl epoxy compound and arylboronic acid are used as raw materials, diethylene glycol dimethyl ether nickel bromide is used as a catalyst, chiral biimidazoline is used as a ligand, under the promotion of sodium iodide, reaction is performed in an ethanol solvent according to the following reaction formula at the temperature of 50 DEG C for 10 hours, and the chiral beta-diaryl ethanol compound with the high ee value is obtained.

The present invention relates to the technical field of chiral inositol, and a method for preparing high-purity chiral inositol is proposed, comprising the following steps: S1, kasugamycin hydrochloride and hydrochloric acid are mixed and hydrolyzed to obtain a mixed solution; S2, the mixed solution is concentrated, cooled, calcium oxide is added for mixed reaction, ion exchange resin is used for impurity removal, superfluous liquid is collected, and dried to obtain D-chiral inositol. Through the above technical scheme, the problem that the preparation of D-chiral inositol using kasugamycin hydrochloride as raw material in the related art is large in ion exchange resin dosage and low in purity of D-chiral inositol is solved.

To provide a process for the separation of at least one inositol from a carob extract.SOLUTION: This process comprises the steps of: a) providing a filtered and demineralised carob extract having a Brix value greater than 60 and a pinitol content, in weight percent based on the weight of the extract, from 5 to 25%; b) subjecting the carob extract of step a) to a process of chromatographic separation of the pinitol, wherein the process comprises subjecting the extract to at least one passage through a chromatographic resin, thus obtaining an aqueous solution having a pinitol content, in weight percent based on the total weight of the solution, from 35 to 70%, and which has a Brix value of 20 or lower; and c) subjecting the aqueous solution thus obtained in step b) to a purification step, thus obtaining a purified aqueous solution having a pinitol content, in weight percent based on the total weight of the solution, of more than 55%.SELECTED DRAWING: Figure 1

The present invention relates to a process for preparing an 1,2-alkanediol from the corresponding alkene and hydrogen peroxide which does not require isolation and purification of the intermediate alkene oxide.

This invention discloses an acid-catalyzed controlled degradation and recycling method for waste polyester and polyester-cotton blended fabrics. Using waste polyester or waste polyester-cotton blended fabrics as raw materials, under the action of an acidic catalyst, in a mixed solvent composed of a polar aprotic solvent and water, the method involves heating and degradation, causing the polyester in the waste polyester or polyester-cotton blended fabrics to depolymerize or co-depolymerize, generating organic raw materials. This invention achieves complete depolymerization and recycling of polyester with a relatively low acid dosage, effectively avoiding the corrosion problems of equipment and excessive degradation of cotton fibers caused by existing technologies. It is also more conducive to the generation and recovery of glucose and 5-hydroxymethylfurfural. Furthermore, the separation steps are simple, greatly reducing separation costs, and high-yield recovery of terephthalic acid, glucose, and 5-hydroxymethylfurfural is achieved, realizing high-value recycling and utilization of various components in textiles, reducing waste, and improving resource utilization.