12results about "Ether preparation from oxiranes" patented technology

The application belongs to the technical field of solid phase catalysis, and discloses application of a porous polymer catalyst in catalyzing an epoxy ring-opening reaction. The porous polymer catalyst is prepared by the following method: (1) trihelium is dissolved in a solvent together with a Lewis acid, and through reaction I, washing, refluxing, filtering and drying, a hypercrosslinked self-porous polymer is obtained; (2) the hypercrosslinked self-porous polymer obtained in step (1) is dispersed in concentrated sulfuric acid, and through reaction II, a sulfonated multifunctional hypercrosslinked self-porous polymer, i.e. the porous polymer catalyst, is obtained. The polymer catalyst provided by the application is rich in porous structure, can efficiently catalyze the synthesis of an epoxy ring-opening reaction under simple catalytic conditions, and can realize a conversion rate close to 100% under a small amount of catalyst, a short reaction time and a low temperature, and has high industrial application value.

The present invention relates to the technical field of fine chemical synthesis. Disclosed is a method for synthesizing bisphenol A polyether. In the synthesis method, bisphenol A is used as an initiator, and a composite catalyst consisting of a carbonate, an amine compound, and an organic phosphine is used to catalyze a ring-opening polymerization reaction of an alkylene oxide, thereby obtaining a bisphenol A polyether having a low hydroxyl value and a light color. The problems in the prior art that a product is prone to isomerization and decomposition under the action of a strong base catalyst, and that the color of the product darkens are effectively solved.

The present disclosure generally relates to the synthesis of an alkoxylated cannabinoid using a double metal cyanide (DMC) catalyst. This procedure affords a novel process for preparing water-dispersible and water-soluble versions of cannabidiol (CBD) and other cannabinoids in high yields through mild reaction conditions.

The present invention relates to a group of resorcinol derivatives as a pharmaceutically active compounds and methods of preparation thereof. Resorcinol derivatives have been used to treat various diseases and disorders. While such treatments hold promise, there remains a need in the art for more effective treatments and this has been brought about by way of the resorcinol derivative of the invention.

The application relates to the technical field of petroleum chemical industry, and provides a surfactant, a preparation method thereof and application of the surfactant in oil displacement. The structural formula of the surfactant provided by the application is shown as formula I. Compared with traditional double alkyl double quaternary ammonium salt cationic surfactants, the surfactant provided by the application has sulfonic acid groups at two ends, the molecular structure of the sulfonic acid group amphiphilic hydrophilic group endows the surfactant with better temperature resistance and salt resistance and better water solubility, an oil displacement system formed by the surfactant can reduce the crude oil / formation water interfacial tension to ultra-low under an alkali-free condition; and the oil displacement system has strong oil displacement capacity at a low concentration, is resistant to high formation temperature, and performs excellently in a heavy oil and high salinity environment.

This invention provides a solid-liquid phase O-alkylation reaction catalyst and its preparation method. The catalyst consists of an organic compound, a metal oxide, and excipients; the metal oxide is a magnesium-aluminum mixed oxide, the organic compound is sulfonated chitosan, and the excipients are a silane coupling agent, methylsilane, anhydrous toluene, anhydrous ethanol, deionized water, glacial acetic acid solution, sodium hydroxide solution, and anhydrous dichloromethane. The sulfonated chitosan is chemically loaded onto the magnesium-aluminum mixed oxide, ensuring the catalyst possesses dual acid-base catalytic centers, improving the reactivity of the raw materials, enhancing the catalyst's stability, facilitating post-reaction separation, and extending its cycle life.

The present invention belongs to the technical field of organic compounds. Disclosed are preparation methods for butynediol diethoxy ether and butynediol polyethoxy ether. The preparation method for butynediol polyethyoxyl ether comprises the following steps: mixing 1,4-butynediol and a basic catalyst, then adding a first ethylene oxide to perform a first polymerization reaction, and after the reaction is finished, conducting a post-treatment, so as to prepare butynediol diethyoxyl ether; and mixing the butynediol diethoxy ether with a second ethylene oxide and a phosphazene salt catalyst to perform a second polymerization reaction, so as to prepare butynediol polyethoxy ether. The butynediol diethoxy ether prepared in the present invention has a light color and a narrow molecular weight distribution. By using the butynediol diethoxy ether to prepare butynediol polyethoxy ether and using a phosphazene salt as a catalyst for the second polymerization reaction, butynediol polyethoxy ether having a light color, a narrow molecular weight distribution, a low peroxide value and a low residual quantity of 1,4-butynediol can be prepared.

This invention relates to the field of C09D11 / 38 dispersants, and more specifically, provides an aqueous dispersant and its preparation method. The aqueous dispersant provided by this invention comprises: ethyl polyethylene glycol, tert-butyl polyethylene glycol, naphthyl polyethylene glycol, and deionized water. It can be adsorbed onto the surface of pigment particles through different anchoring groups, and further enhanced by steric hindrance groups, allowing the pigment particles to maintain a stable dispersion state while retaining low viscosity, thus improving the performance of the aqueous dispersant. Furthermore, it imparts excellent gloss and color strength to the pigment, making it suitable for industrial production.

The present invention belongs to the technical field of organic synthesis. Disclosed is a preparation method for bisphenol A bis(2-hydroxyethyl) ether. The specific steps of the preparation method are as follows: adding bisphenol A, a mixed acetate catalyst and a solvent into a reactor; starting stirring and performing replacement by nitrogen, raising the temperature to a reaction temperature, and then starting to feed ethylene oxide; after the addition of ethylene oxide is completed, maintaining the temperature and continuing the reaction until the pressure no longer decreases; cooling same to a desolventization temperature, performing desolventization until no more solvent comes out, then cooling same and degassing same, and discharging same to obtain the bisphenol A bis(2-hydroxyethyl) ether. The mixed acetate catalyst consists of calcium acetate, magnesium acetate and barium acetate; and the solvent is methyl cyclohexane. The preparation method of the present invention uses specific mixed acetates as a catalyst and methyl cyclohexane as a solvent, so that an excellent catalytic effect is achieved and the prepared bisphenol A bis(2-hydroxyethyl) ether is endowed with high purity, a low hydroxyl value and light color, and the solvent has low toxicity and is easy to recycle.

This invention belongs to the field of industrial catalysis and discloses a method for preparing propylene glycol monomethyl ether (PPD) by catalyzing the liquid-phase oxidative alcoholysis of propylene using a bifunctional TiSn-MFI molecular sieve. The steps are as follows: propylene, methanol, hydrogen peroxide aqueous solution, and catalyst are mixed and reacted in the same batch reactor to obtain PPD in one step. The catalyst is a bifunctional TiSn-MFI zeolite molecular sieve containing framework titanium and tin active sites. This synthesis method can catalyze the production of PPD from propylene using the same reactor and the same catalyst, shortening the reaction process of producing propylene oxide from propylene, followed by ring-opening alcoholysis of propylene oxide to obtain PPD, reducing energy consumption and reaction costs. Furthermore, the use of a bimetallic doped molecular sieve catalyst with two closely spaced active centers is beneficial for catalyzing a series of reactions. Compared with previous composite catalyst preparation methods, this method is simpler and has promising industrial applications. The synthesized TiSn-MFI catalyst does not contain non-framework titanium and tin species, has an irregular morphology of stacked crystals, and exhibits high hydrogen peroxide conversion and PPD selectivity.

This invention discloses a wet flue gas denitrification enhancer and its preparation method, relating to the field of flue gas denitrification technology. The wet flue gas denitrification enhancer comprises the following raw materials in parts by weight: organic acid: 5-12 parts, metal catalyst: 1-5 parts, pH buffer: 3-10 parts, surfactant: 0.5-2 parts, and deionized water: 20-40 parts. The flue gas denitrification enhancer prepared by this invention exhibits good denitrification efficiency.