349results about "Preparation by hydrolysis" patented technology

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 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 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 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 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 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 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.

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.

The present invention relates to the technical field of organic synthesis. Disclosed is a method for synthesizing allyl alcohol. The synthesis method comprises the following steps: adding a water-soluble acid-resistant high-boiling-point organic solvent to an aqueous allyl acetate solution and stirring the mixture to form a homogeneous solution; then heating the homogeneous solution, and performing a hydrolysis reaction under the action of a solid acid catalyst to obtain a mixture solution containing allyl alcohol; and then distilling the mixture solution to separate out the high-boiling-point organic solvent to obtain a crude allyl alcohol product. The synthesis method provided by the present invention can significantly improve the single-pass hydrolysis conversion rate of allyl acetate at low costs and achieve efficient and continuous industrial production of allyl alcohol. Moreover, the method can realize the separation of allyl alcohol from the high-boiling-point organic solvent simply by means of a simple distillation separation process. The separated organic solvent has high purity and light color and can be reused. The method has no waste liquid and waste residue generated.

A method for supplying deaerated water to a chemical plant, wherein the chemical plant includes a distillation column for separating a reaction effluent including water and a product. The method includes charging aerated water (water having an oxygen content greater than 50 ppbw, such as greater than 1 ppmw) to the distillation column. The aerated water in the distillation column can then be distilled to produce an oxygen-containing overhead and a bottoms fraction including deaerated water. The deaerated water in the bottoms fraction can be transported to and utilized in upstream or downstream unit operations. The reaction effluent is fed to the distillation column, converting the distillation column from an operation that separates oxygen from water to an operation that separates the product from water.

To provide a method for producing an alcohol, which has high safety, does not need time and effort, and is excellent in cost.SOLUTION: A method for producing an alcohol comprises: step (1) of carrying out a hydrolysis reaction and condensation reaction of tetraalkoxysilane under an alkali catalyst to obtain a dispersion of silica particles comprising the alcohol; step (2) of isolating a solution comprising the alkali catalyst and the alcohol from the dispersion of silica particles obtained in the step (1); and step (3) of passing the solution comprising the alcohol, obtained in the step (2), through an ion exchange resin to obtain the alcohol with the alkali catalyst removed.SELECTED DRAWING: None

Methods for preparation of olefins, including 8- and 11-unsaturated monoenes and polyenes, via transition metathesis-based synthetic routes are described. Metathesis reactions in the methods are catalyzed by transition metal catalysts including tungsten-, molybdenum-, and ruthenium-based catalysts. The olefins include insect pheromones useful in a number of agricultural applications.

[Abstract] [Problem] To provide a method for producing a dealkoxyphenylation product with high yield from a substrate, e.g., a sugar, which is bonded to an alkoxyphenyl group through an oxygen atom. [Solution] A substrate that is bonded to a phenyl group substituted by a C1 to C5 alkoxy group at a para- or ortho-position through an oxygen atom is reacted with a λ3-iodane in a fluorous alcohol and water, whereby a dealkoxyphenylation product can be obtained with high yield under mild conditions.

The utility model relates to corn soaking water treatment technical field especially, relates to a kind of production system for preparing ammonium magnesium phosphate and inositol with corn soaking water, including the pH regulating tank being connected with corn soaking water delivery pipeline, pH regulating tank, first filter device, resin column, neutralization kettle, second filter device, hydrolysis kettle, pH adjusting kettle, third filter device are sequentially connected in proper order, the liquid outlet of third filter device is connected with decoloring kettle, concentration kettle, crystallization kettle, the crystal outlet of crystallization kettle is connected with first drying device, the discharge port of first drying device is connected with inositol storage tank;The discharge port of third filter device is connected with second drying device, the discharge port of second drying device is connected with ammonium magnesium phosphate storage tank.The above-mentioned production system system, corn soaking water is recycled, and high yield, high recovery, high-purity ammonium magnesium phosphate product and inositol product are obtained, and resource waste is avoided, and economic benefit is increased for enterprise.

The invention relates to a method for degradation of plastic materials into terephthalic acid (TPA) and / or ethylene glycol and / or other monomers that form the plastic materials.

This invention discloses a method for the deamination functionalization of aliphatic nitrosamines, comprising: reacting an aliphatic nitrosamine as shown in formula (II) with a nucleophile in the presence of an acid and a solvent to generate a deamination functionalized product as shown in formula (III); wherein, R 1 R 2 R 3 Each group is independently selected from hydrogen, hydroxyl, alkyl, alkoxy, alkanoyl, alkoxycarbonyl, alkylsulfinyl, alkylsulfonyl, aryl, heteroaryl, phenylalkyl, or R 1 R 2 R 3 Two or three of the functional groups form a non-aromatic ring, cage-like compound; FG is a functional group in which a nucleophile participates in the reaction. The method of this invention has the advantages of inexpensive and readily available raw materials, simple reaction conditions, and wide substrate applicability.

The disclosure generally relates to a method for hydrolyzing a terephthalic acid monoester, the method comprising exposing the terephthalic acid monoester to a polypeptide having MHETase activity under conditions sufficient to allow the polypeptide to convert the terephthalic acid monoester to terephthalic acid and an alcohol, wherein the terephthalic acid monoester is not mono-(2-hydroxyethyl) terephthalate.

A process for the preparation of ethylene glycol comprising the steps of: a) supplying a first gas composition comprising ethylene oxide and carbon dioxide to an ethylene oxide absorber and allowing the gas composition to pass upwards through an absorption section; b) supplying a lean absorbent to the top of the absorption section and allowing the lean absorbent to pass downwards through the absorption section; c) intimately contacting the gas composition with lean absorbent on the trays in the absorption section in the presence of one or more catalysts to produce a fat absorbent stream comprising ethylene glycol and ethylene carbonate; d) withdrawing fat absorbent from the absorber; and e) withdrawing a second gas composition from the top of the absorber.

The application provides a preparation method and product of 1,3-propanediol. The preparation method comprises the following steps: subjecting 3-hydroxypropionaldehyde aqueous solution to a first-stage hydrogenation reaction under the action of a first-stage hydrogenation catalyst to obtain a first-stage hydrogenation reaction product; and subjecting the first-stage hydrogenation reaction product to a second-stage reaction under the action of a second-stage hydrogenation catalyst to obtain a 1,3-propanediol product. The preparation method adopts two-stage hydrogenation, effectively improves the economy of the propenal hydration hydrogenation process, and solves the problems that the impurities generated in the 1,3-propanediol preparation route of the propenal hydration process are difficult to treat and resource utilization.

The present invention relates to halogenated alkenylalkoxymethyl ether compounds of the following general formula (1): R 1 CH2OCH2OCH2CH2CH=CH(CH2) a X 1 (1), wherein R 1 represents a hydrogen atom, a n-alkyl group having 1 to 9 carbon atoms, or a phenyl group, X 1 represents a halogen atom, and a represents an integer of 3 to 14. The present invention also relates to a method for producing terminal conjugated alkadien-1-yl acetate compounds of the following general formula (5): CH2=CHCH=CH(CH2) a OAc (5), wherein a is defined as above, and Ac represents an acetyl group, and a method for producing terminal conjugated alkadien-1-ol compounds of the following general formula (6): CH2=CHCH=CH(CH2) a OH (6), wherein a is defined as above.

To provide a cyclic carbonate that serves as raw material for polycarbonate resin, an epoxide, and a diol and methods for producing them.SOLUTION: A cyclic carbonate is represented by the following formula (1) (where, in the formula (1), R1-R12 independently represent a hydrogen atom, a hydroxy group, a phosphate group, a C6-20 aryl group, a C6-20 aralkyl group, a C1-10 alkoxy group, a C1-30 silyl group, a C1-30 silyl alkoxy group, a C1-11 ester group, a C1-11 acyl group or the like, X is an unsubstituted, monosubstituted or disubstituted methylene group, and n is an integer of 0-2).SELECTED DRAWING: None