109results about "Preparation by hydrolysis" patented technology

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%.

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

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.

[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 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.

The application relates to a method for co-producing propylene glycol / dipropylene glycol / polyether 202 and a polyether preparation method, wherein the method for co-producing propylene glycol / dipropylene glycol / polyether 202 comprises the following steps: mixing water and propylene oxide to carry out a hydration reaction to obtain a reaction liquid; the temperature of the hydration reaction is 160 DEG C-240 DEG C, the pressure is 10 MPa-25 MPa, and the molar ratio of water to propylene oxide is (0.08-0.6):1; the reaction liquid is subjected to rectification to obtain propylene glycol, dipropylene glycol and polyether 202 respectively. KOH or NaOH is not needed to be used as a catalyst, that is, neutralization and filtration steps are not needed to be carried out, waste water and filter residue generated due to the neutralization and filtration steps can be effectively avoided, and the risk that polyether 202 contains potassium ions, sodium ions or has an acid value exceeding a standard can be effectively avoided. The polyether 202 obtained by the method has a low acid value, low contents of potassium ions and sodium ions, and can be directly used as a starting agent for preparing polyether; and the obtained propylene glycol and dipropylene glycol have high purity.

A method for preparing 1,2-pentanediol and co-producing 2,3-epoxypentane, 2,3-epoxy-2-methylbutane, and 1,2-epoxy-2-methylbutane involves using the residual C5 from cracked ethylene as the reactant, an organic peroxide as the oxidant, and a titanium-silicon molecular sieve as the catalyst to undergo a catalytic oxidation reaction. The resulting reaction products are then separated by distillation. The residual C5 component is collected at the top of a first distillation column, and the bottom product is transferred to a second distillation column. Epoxyalkane is collected at the top of the second distillation column. The collected epoxyalkane is transferred to a third distillation column, where 1,2-epoxy-2-methylbutane and 2,3-epoxy-2-methylbutane are collected at the top, and 2,3-epoxypentane and 1,2-epoxypentane are collected at the bottom. The bottom product of the third distillation column is then subjected to an alkaline hydrolysis reaction. The mixture obtained from the alkaline hydrolysis reaction is further distilled to separate 1,2-pentanediol and 2,3-epoxypentane. This invention provides a green and environmentally friendly method for the high-value utilization of C5 residue from cracked ethylene.

This invention provides a recycled polyol manufactured from polyurethane foam waste and a method for producing the same. [Solution] The recycled polyol has a hydroxyl value (OH value) of 250 mg KOH / g to 1000 mg KOH / g and an amine value of less than 30 mg KOH / g. By applying a titanium catalyst when depolymerizing LNG insulation waste rigid composite polyurethane foam, the recycled polyol can be produced without the step of removing residual catalyst associated with depolymerization using a strong base such as KOH, thereby shortening the process and improving environmental impact.

The present application relates to carbocyclic compounds, more particularly to the field of cyclohexanehexol, and particularly to a method for extracting D-chiro-inositol from Ceratonia siliqua and application thereof. The present application uses an acid hydrolysis method, takes TFA as a catalyst, and takes L-(-) camphor sulfonic acid as a specific recrystallization selection agent to obtain high-purity DCI from Ceratonia siliqua, and has the advantages of high extraction efficiency, high DCI yield, high purity, low cost, green environmental protection and the like.

The invention discloses a catalyst for catalyzing high-concentration cellulose into ethanol and a preparation method of the catalyst. The method comprises the following steps: (1) firstly, adding a carbon source, water-soluble nickel salt and silicon dioxide into deionized water for hydrothermal reaction; then performing high-temperature carbonization treatment on a product of the hydrothermal reaction in an inert atmosphere, and after the reaction, performing alkali washing, filtering and drying to obtain a crude catalyst body; (2) dipping the catalyst crude body in a platinum salt solution, and after dipping, filtering and drying to obtain a catalyst precursor; and (3) carrying out high-temperature reduction treatment on the catalyst precursor in an H2 atmosphere, cooling, and collecting to obtain the catalyst. The catalyst can directly convert high-concentration cellulose into ethanol in a pure water environment, the target product selectivity is high, and the catalyst still has good catalytic activity and target product selectivity after being recycled for multiple times.

The present invention provides a novel compound, (4Z,6E)-4,6-undecadienyl trimethylacetate (1). The present invention further provides a process for preparing (4Z,6E)-4,6-undecadienyl trimethylacetate (1), the process comprising subjecting a 4-halobutyl trimethylacetate compound (2) wherein X1 represents a halogen atom, to a phosphonium salt formation reaction with a phosphine compound of the following general formula (3) wherein Ar represents, independently of each other, an aryl group, to obtain a [4-(trimethylacetyloxy)butyl]triarylphosphonium halide compound (4) wherein Y represents a halogen atom, and Ar is as defined above, subjecting the [4-(trimethylacetyloxy)butyl]triarylphosphonium halide compound (4) to a deprotonation reaction in the presence of a base to obtain a reaction product mixture, and subjecting the reaction product mixture to a Wittig reaction with (2E)-2-heptenal (5) to obtain (4Z,6E)-4,6-undecadienyl trimethylacetate (1).

The application provides a method for synthesizing 2,4,4-trimethyl-2-pentanol from diisobutene by esterification hydration, comprising the following steps: S1, esterification hydration reaction: diisobutene, organic acid and water are reacted in the presence of a catalyst; S2, separation and recovery: S3, hydrogenation reaction: 2,4,4-trimethyl-2-pentyl acetate recovered in step S2.5 is subjected to catalytic hydrogenation to generate a hydrogenation reaction liquid containing 2,4,4-trimethyl-2-pentanol and ethanol; S4, the hydrogenation reaction liquid obtained in step S3 is separated, and TMPOL is synthesized by using the above method with the organic acid as a medium, the single-pass conversion rate of diisobutene can reach 50%, and the selectivity reaches 99%. The process has the characteristics of high efficiency and high atom economy, and has great industrialization potential.

This invention relates to the field of corn soaking water treatment technology, and particularly to a process for producing expanded compound fertilizer using corn soaking water, comprising the following steps: (1) passing the supernatant of corn soaking water after static sedimentation through an anion exchange resin column; (2) replacing the residual corn soaking water in the anion exchange resin column with compressed air, eluting with potassium sulfate solution, and collecting the first and second eluents respectively; (3) taking the first eluent, adjusting the pH, and then concentrating and hydrolyzing it, the resulting hydrolysate is flash-cooled and filtered, and the collected filtrate is used for later use; (4) taking the filtrate and processing it using a simulated moving bed chromatography separation system to obtain inositol product and phosphate phase; (5) taking the phosphate phase, concentrating and filtering it, adding a decolorizing agent to the collected filtrate, and after decolorization treatment, granulating and drying the decolorized liquid to obtain expanded compound fertilizer. The above process can produce expanded compound fertilizer.

The present invention relates to a method for recycling polyurethanes from a composition comprising an elastomeric polyurethane (PU1) and at least one further material, the method comprising the steps of providing a composition (CW) comprising a polyurethane (PU1) and at least one further material, and contacting the composition (CW) with a solvent mixture (SM) comprising at least one alcohol and at least one compound (A1) selected from the group consisting of cyclic amides, at a temperature below the boiling point of the alcohol, to obtain a solution (S1) rich in dissolved polyurethane (PU1). The invention also relates to the polyurethanes obtained or obtainable by said method, as well as to the use of the polyurethanes according to the invention for preparing molded articles.

Disclosed herein is a fluid composition for depolymerizing a polymer, the fluid composition comprising from 5% to 90% by volume of carbon dioxide in the form of a supercritical fluid; 5% to 90% by volume of superheated water; and 5% to 90% by volume of an alcohol; wherein the alcohol is in its superheated state or in the form of a supercritical fluid; wherein all vol% are based on the total volume of the fluid composition; wherein the fluid composition is at a temperature of more than 150 DEG C, a pressure of more than 500 psi, for a period of more than 30 minutes.

This invention provides a method for preparing 1,2-propanediol and its application. The method includes: step (1): in the presence of an acidic catalyst and water, ring-opening of a first portion of propylene oxide to obtain an acid-catalyzed reaction solution containing 1,2-propanediol; step (2): in the presence of an alkaline catalyst and water, ring-opening of a second portion of propylene oxide to obtain an alkaline-catalyzed reaction solution containing 1,2-propanediol; step (3): mixing the obtained acid-catalyzed reaction solution and the alkaline-catalyzed reaction solution for a neutralization reaction to obtain a mixture containing 1,2-propanediol; wherein, the molar ratio of the first portion of propylene oxide to water in step (1) and the molar ratio of the second portion of propylene oxide to water in step (1) are each independently 1:1-5; using the method of this invention to prepare 1,2-propanediol requires only a lower water ratio to obtain a higher propylene oxide conversion rate and 1,2-propanediol content, and the wastewater volume is lower and the color is colorless after the reaction.

The invention belongs to the field of fine chemical engineering, and particularly relates to a production method of dihydric alcohol, which comprises the following steps: a) olefin, hydrogen peroxide, a titanium silicalite molecular sieve catalyst and a solvent form a uniform system through a static mixer, then the uniform system is sent to a dynamic tubular reactor for epoxidation reaction, and a reaction product is subjected to liquid-solid separation, a liquid phase obtained through separation is sent to a first rectifying tower; b) separating light and heavy components from the liquid phase through a first rectifying tower, and sending the separated heavy components to a microreactor; and c) carrying out hydrolysis reaction on the heavy components in the microreactor, and carrying out second rectification on the reacted material to separate light and heavy components, thereby obtaining a heavy component, namely a dihydric alcohol product. According to the method provided by the invention, a static mixer and continuous equipment are adopted, so that the mixing and dissolving effect of raw materials is enhanced, introduction of formic acid is avoided, and the problem of introduction of impurities is solved from the source; and meanwhile, the method does not adopt an acid / alkali catalyst, so that the introduction of sensitizers is avoided, the process flow is shortened, and the production efficiency is improved.

Provided here are methods and systems for producing 2-methylbuta-1,3-diene from a C4 stream. On such method includes contacting a feed stream that contain 2-methylprop-1-ene and but-1-ene or but-2-ene with methanol over an acid resin catalyst to produce a 2-methoxy-2-methylpropane stream. The method further cracks the 2-methoxy-2-methylpropane stream into a cracked stream containing 2- methylprop-1-ene and methanol. Then, the method metathesizes the 2-methylprop-1-ene from the cracked stream into a first metathesized stream containing ethene and 2,3-dimethyl-2- butene. Next, the method metathesizes at least a portion of 2,3-dimethylbut-2-ene from the first metathesized stream to produce a second metathesized stream containing 2-methyl-2-pentene. Finally, the method dehydrogenates the second metathesized stream to produce a product stream containing 2-methylbuta-1,3-diene.

The invention belongs to the technical field of catalytic hydrogenation, and discloses a 1, 4-butanediol preparation method, which comprises: in the presence of hydrogen, contacting a catalyst, gamma-butyrolactone and an organic solvent to carry out a reaction to obtain a product containing 1, 4-butanediol, the catalyst is characterized in that the catalyst is a copper-based catalyst, the copper-based catalyst contains an active component copper and a dispersant aluminum oxide, and the most probable pore size of the copper-based catalyst is 18-40 nm. The copper-based catalyst adopted by the method has high catalytic hydrogenation selectivity, and the generation of a byproduct tetrahydrofuran in the gamma-butyrolactone process can be remarkably reduced.

The invention discloses a deamination functionalization method of fatty amine or fatty nitro-amine, which comprises the following steps: reacting fatty amine as shown in a formula (I) or fatty nitro-amine as shown in a formula (II) with a nucleophilic reagent in the presence of acid and a solvent to generate a deamination functionalization product as shown in a formula (III), wherein R1, R2 and R3 groups are independently selected from hydrogen, hydroxyl, amino, alkyl, alkoxy, alkanoyl, alkoxycarbonyl, alkyl sulfinyl, alkyl sulfonyl, aryl sulfonyl, aryl, heteroaryl and phenylalkyl, or two or three of the R1, R2 and R3 groups form a non-aromatic ring and a cage compound; fG is a functional group for the nucleophilic reagent to participate in the reaction. The method has the advantages of cheap and easily available raw materials, simple reaction conditions, wide substrate applicability and the like.

Stereoselective methods of producing a stereoisomer of p-menthane-3,8-diol are disclosed, the methods comprising the steps of: hydrating the alkene group of isopulegol, or performing a ring opening reaction on verbenol and hydrogenating and deprotecting the resulting diol. Also disclosed are compositions comprising 95mol% or greater of a stereoisomer of p-menthane-3,8-diol and insect repellents, flavourings or fragrances comprising such compositions. Also disclosed are methods of reducing resistance of a target insect or tick species to a p-menthane-diol repellent.

The invention belongs to the technical field of chiral resolution of organic compounds, and particularly discloses a method for obtaining 1S, 5R-pinanol by chiral carboxylic acid-mediated dynamic kinetic resolution of trans-pinanol, which comprises the following steps: dissolving trans-pinanol, chiral carboxylic acid and a solid acid catalyst in a solvent, stirring at a proper temperature, and reacting to obtain the 1S, 5R-pinanol. The method comprises the following steps: carrying out selective esterification reaction on trans-pinyl hydrate to generate a chiral ester intermediate, carrying out rapid racemization on unreacted trans-pinyl hydrate, after the reaction is finished, filtering and recovering a solid acid catalyst, carrying out reduced pressure rectification on filtrate, separating a product chiral ester and recovering a solvent, and further hydrolyzing the chiral ester in an alkaline system to obtain optically pure 1S, 5R-pinyl hydrate, and recovering the chiral carboxylic acid. The optically pure 1S, 5R-pinyl hydrate is prepared in a green and efficient manner by utilizing the catalytic synergistic effect of chiral carboxylic acid and solid acid, and the method has the advantages of high enantioselectivity, high raw material utilization rate, good process adaptability and good industrial application prospect.

Processes, systems, and apparatus are provided for using a common working fluid for one or more turbines for processing a process gas and for the furnace for the pyrolysis process used to produce the process gas. The turbine(s) are operated based on a modified Allam cycle to produce power for operating one or more compressors and / or refrigerators involved in processing of the process gas while producing a reduced or minimized amount of CO2 that is released as a low-pressure gas phase product. Integrating the pyrolysis furnace with the working fluid loop can provide further benefits.

The application provides a kind of β-elemene alcohol derivatives and its preparation method, composition and purpose, belong to medical technology and pharmaceutical chemistry field, for a kind of compound 2-[(1R,2R,4S)-1-methyl-2,4-di(prop-1-en-2-yl)cyclohexyl]ethan-1-ol, and the pharmaceutically acceptable salt, hydrate, prodrug and pharmaceutical composition comprising the compound.For overcoming the defects such as poor water solubility, low bioavailability and limited efficacy of broad-spectrum anticancer component β-elemene, the hydrophilic terminal hydroxyl group is successfully introduced by oxidation modification in specific olefin site.The derivative significantly improves the water solubility and pharmacokinetic parameters while retaining the core skeleton, and the antitumor activity on various tumor cells is obviously better than the parent β-elemene.The compound of the application has clear structure, simple synthesis, and can be used as a better candidate drug for drug preparation, for preparing solid tumor drugs for treating lung cancer, liver cancer and the like.

The invention discloses a preparation method of methylallyl alcohol, which comprises the following steps: adding tricarboxylate into a reaction kettle, adding water for dissolving, heating and refluxing; dropwise adding methyl allyl chloride, and controlling the reaction temperature; cooling and filtering to obtain tricarboxylate solid and filtrate for later use; adding the tricarboxylate solid into a sodium hydroxide aqueous solution for reflux hydrolysis, cooling and layering to obtain methylallyl alcohol and tricarboxylate, and after separation, combining the tricarboxylate with the filtrate for recycling. The polycarboxylate obtained after esterification of the ternary carboxylate has small solubility in a solution, and an esterification product is a precipitate and can be naturally separated out; the esterification reaction can be carried out even under the condition of no catalyst, and the reaction is simple and rapid; then, the polybasic carboxylic ester can be separated through simple filtration, so that the emulsification phenomenon of the carboxylic ester in a water layer is overcome; and hydrolyzing the polybasic carboxylic ester to obtain corresponding alcohol and tricarboxylate, rectifying the alcohol to obtain the product methylallyl alcohol, and recycling the tricarboxylate.