45 results about "Methyl vinyl ketone" patented technology

Trans-2,2,6-trimethylcyclohexyl methyl ketone, including (1S,6R)-2,2,6-trimethylcyclohexyl methyl ketone represented by the formula (1a): and (1R,6S)-2,2,6-trimethylcyclohexyl methyl ketone represented by the formula (1b): are useful components in a perfume composition. A process for producing the same is also described. A unique eucalyptus, mint-like and white floral perfume material is provided using the ketone compounds disclosed in the present invention. The process of the present invention produces the optically active ketone compounds having optical purity up to at least 98.0% e.e.

The invention discloses a method for preparing 2,3-butanedione from paraformaldehyde. The method comprises the following steps of: preparing methyl vinyl ketone in one step from paraformaldehyde and acetone which serve as raw materials and L-proline serving as a catalyst through a condensation reaction of aldehydes and ketone and a dehydration reaction; and preparing 1,2-epoxy butanone from the methyl vinyl ketone serving as a raw material, hydrogen peroxide serving as an oxidant and a titanium and silicon molecular sieve serving as a catalyst by a catalytic oxidation method, and adding sodium hydrogensulfite for heating, and performing pinacol rearrangement to prepare 2,3-butanedione. Compared with the conventional method for preparing the 2,3-butanedione, the method has the characteristics of low cost, environmental-friendliness, high conversion rate of the paraformaldehyde and selectivity of the 2,3-butanedione and the like, and provides an environmental-friendly synthetic method for the industrial production of the 2,3-butanedione.

The invention discloses a manufacturing method for photosensitive polymer optical fiber preform rod and the core material. Under the high pressure, Teflon rope technology is used to manufacture single-mode or few-mode functional polymer optical fiber preform rod and optical fiber by two-step method. Main components of core material are polymethyl methacrylate pmma, additive with higher refractive index, methacrylic acid ester and copolymer of photosensitive monomer, methyl vinyl ketone, azo monomer, monomer complex with rare earth and methyl methacrylate pmma. As the functional optical fiber is manufactured by doping copolymer, the upper limit of doping concentration of photosensitive matter is improved greatly while the diffusion of small molecule in copolymerization process is avoided. It is easier to control the fiber size and the refraction of fiber core.

The invention discloses a synthetic method of (2E, 4E)-2-methyl-6-oxo-2 and 4- heptadiene aldehyde. The method of the invention comprises the processes: 2-methacrylate and alkyl methacrylate ester is transformed to 3-iodine-2-methacrylate and alkyl methacrylate esters through bromine addition, elimination and iodine exchanging; then a coupling reaction is carried out between the 3-iodine-2-methacrylate and alkyl methacrylate esters and methyl vinyl ketone to generate the (2E, 4E)-2-methyl-6-oxo-2 and the 4- heptadiene aldehyde; the (2E, 4E)-2-methyl-6-oxo-2 and the 4-heptadiene aldehyde are transformed to (2E, 4E)-2-methyl-2, 4-heptadiene-1 and 6-menthandiol through a reduction reaction; the (2E, 4E)-2-methyl-2, the 4-heptadiene-1 and the 6- menthandiol are oxidized to obtain the (2E, 4E)-2-methyl-6-oxo-2 and the 4- heptadiene aldehyde.

The synthesis process of methyl ethyl ketone azine includes the synthesis of ammonia, hydrogen peroxide and methyl ethyl ketone in work solution containing catalyst and ionic liquid at 20-100 deg.c, and post-treatment to obtain product. The synthesis process inside ionic liquid of the present invention has high safety, high dissolubility on organic matter and inorganic matter, homogeneous reaction condition, easy operation and treatment, and high product yield. The ammonia water, methyl ethyl ketone and methyl cyanide distilled out of the reacted liquid may be reused without influence on the yield.

Belonging to the field of fine chemicals, the invention discloses a production method of 4-hydroxy-2-butanone, and solves the problem of low yield of existing synthetic methods. The method provided bythe invention includes the steps of: adding 1, 3-butanediol, a catalyst, an assistant, water and a water-carrying agent into a reaction kettle, and performing heating to 55-60DEGC; adding hydrogen peroxide dropwise into the mixed solution, and conducting reduced pressure distillation of water; stopping adding hydrogen peroxide, and further performing stirring for 1-1.5h to distill the water-carrying agent out; controlling the temperature of the system not higher than 60DEGC, and conducting reduced pressure rectification to obtain the final product 4-hydroxy-2-butanone. By adding the assistant, 1, 3-butanediol can better participate in the reaction, and the conversion rate can be improved. The chemical reaction carried out in the invention is carried out under a negative pressure condition, and the temperature is controlled not higher than 60DEG C, thus avoiding the generation of methyl vinyl ketone; and in a negative pressure system, the reaction can be fully carried out under a low temperature condition, the product is easier to distill, and impurities are not easily produced.

The invention belongs to the technical field of catalysis and relates to a preparation method for synthesizing a methyl isobutyl ketone catalyst and application thereof, particularly to a preparation method for synthesizing methyl isobutyl ketone at a single state by using acetone and isopropanol as materials, and application of the method. The acetone and isopropanol are catalyzed with the self-made polymer metal complex catalyst to directly synthesize MIBK at one step, the temperature is 80-120 DEG C, reaction time is 10-24 hours, 35.9-38% of acetone conversion rate, MIBK is 94.3-95.9% in selectivity, and the catalyst may be used stably. During reaction, the isopropanol is used as a hydrogen source to release hydrogen of a molecule, the byproduct is acetone and may be used as a material for synthetic MIBK for reuse, and at the consideration of a while, the method has no need for hydrogen, reacting is at normal pressure or micro normal powder, no waste is produced, and the need for green and clean production is met.

The invention discloses a synthetic method of 3-aminomethyl-isoxazole hydrochloride. The synthetic method comprises the steps that with aluminium chloride as a catalyst, chloroacetyl chloride reacts with acetylene to obtain 2,4-dichloro-2-methyl vinyl ketone, then the 2,4-dichloro-2-methyl vinyl ketone and hydroxylamine hydrochloride carry out reflux ring closure in methanol to obtain 3-chloromethyl-isoxazole, then the 3-chloromethyl-isoxazole reacts with NH(Boc)2 in acetonitrile to obtain a key intermediate bi-Boc aminomethyl-isoxazole, and finally Boc is removed in a hydrochloric acid-methanol solution to obtain the target product 3-aminomethyl-isoxazole hydrochloride. The method is mild and simple in reaction conditions, low in cost, high in yield, simple and convenient to operate and suitable for industrial production.

The invention discloses a high-resistance nickel-chromium electrothermal alloy material for electric heating elements. The alloy material comprises a nickel-chromium alloy main body, wherein the nickel-chromium alloy main body is subjected to film coating treatment; the film coating treatment comprises the following steps: (1) sequentially adding 1-2 parts (by weight) of sodium hydroxide, 3.3 parts (by weight) of amino trimethylene phosphonic acid, 2.1 parts (by weight) of gamma-epoxy propyl ether trimethoxysilane and 1.1 parts (by weight) of nonylphenol ethyl oxide carboxylate into 40 parts (by weight) of deionized water, and carrying out uniform stirring; (2) then, sequentially adding 5.5 parts (by weight) of diethylene glycol phenyl ether, 2.6 parts (by weight) of methyl vinyl ketone, 0.5 part (by weight) of secondary sodium alkyl sulfate and 0.7 part (by weight) of benzotriazole e into the solution, and continuing to carry out stirring until thorough and uniform mixing is achieved, so as to prepare a film coating treatment solution; (3) dipping the nickel-chromium alloy main body in the film coating treatment solution, taking out the nickel-chromium alloy main body, and then, baking the nickel-chromium alloy main body. According to the high-resistance nickel-chromium electrothermal alloy material for the electric heating elements, disclosed by the invention, the surface of the nickel-chromium alloy main body is coated with a protective film, so that the performance is good, and the surface smoothness is good.

The invention discloses a synthesis method of 8-bromine-4-carboxyl quinoline, which comprises the following steps of (1) allowing bromoaniline to react with methyl vinyl ketone to form 8-bromine-4-methyl quinoline under the catalysis of ferric trichloride, (2) oxidizing 8-bromine-4-methyl quinoline with selenium dioxide in an organic solvent to form 8-bromoquinoline-4-methanal, and (3) oxidizing 8-bromoquinoline-4-methanal with hydrogen peroxide in an acid medium to form 8-bromine-4-carboxyl quinoline. The method takes cheaper bromoaniline as a raw material, and is simple in synthesis step, high in synthesis yield and high in selectivity.

The present invention relates to a method comprising (A) reacting a β-keto ester with a 2-halo ester under basic conditions to obtain a 2-aceto-3-methyl-succinic acid ester; (B) reacting the resulting 2-aceto-3-methyl-succinic acid ester with methyl vinyl ketone under basic conditions, optionally followed by a decarboxylation reaction and hydrolysis, etc., to obtain an α-methyl-γ-keto acid; and (C) reducing the resulting α-methyl-γ-keto acid to obtain wine lactone or a stereoisomer thereof or a mixture thereof. Alternatively, the present invention relates to a method comprising step (A) as recited above; (B) reacting the resulting 2-aceto-3-methyl-succinic acid ester with methyl vinyl ketone under basic conditions, followed by decarboxylation reaction to obtain an α-methyl-γ-keto acid ester; and (E) reducing the resulting α-methyl-γ-keto acid ester in the presence of a ruthenium complex having a specific structure and in the presence of a hydrogen donor to obtain wine lactone or a stereoisomer thereof or a mixture thereof.

The invention discloses a preparation method of vitamin A acetate. The preparation method comprises the following steps: reacting a compound (I) with acetylene to obtain a compound (II); (2) reacting the compound (II) with lithium amide to obtain a compound (III); (3) reacting the compound (III) with tetradecanal, and hydrolyzing to obtain a compound (IV); (4) carrying out partial hydrogenation reaction on the compound (IV) to obtain a compound (V); (5) carrying out esterification reaction on the compound (V) to obtain a compound (VI); and (6) carrying out bromination and debromination reactions on the compound (VI) to obtain vitamin A acetate (VII), and then crystallizing to obtain a vitamin A acetate crystal product. According to the method, the 4-hydroxy-2-butanone and the acetylene directly react, and preparation and purification processes of methyl vinyl ketone and cis-hexol are not carried out, so that the safety of the process route is improved, and the raw material utilization rate of the 4-hydroxy-2-butanone is greatly improved.

The invention relates to a photodegradable PE wrapping film and a preparation method thereof. The wrapping film comprises the following components: 100 parts of modified linear low density polyethylene (LLDPE) and 3-5 parts of a viscous agent, wherein the modified LLDPE is formed by copolymerization of ethylene, 1-butene, 1-hexene and a ketone-containing monomer with alkenyl. The modified LLDPE isprepared by adding the ketone-containing comonomer in the preparation process of linear low-density polyethylene, and the photodegradable PE wrapping film prepared from the modified LLDPE can be automatically degraded under sunlight irradiation after being used. According to the invention, by adjusting the dosage and proportion of diacetone acrylamide and methyl vinyl ketone and/or ethyl vinyl ketone, the elongation at break of the PE wrapping film can be synergistically improved, also the self-adhesion of the PE wrapping film can be improved, and the dosage of an adhesive is properly reduced. An antistatic agent alkoxy amine salt is added in the preparation process of linear low-density polyethylene, so that the antistatic properties of the material is improved, and the photodegradationproperties of the material can be further improved by virtue of a proper amount of alkoxy amine salt.

The invention discloses novel HS white gravure ink. The novel HS white gravure ink relates to the field of printing ink. The novel HS white gravure ink comprises: 18 to 23% of synthetic wax, 7 to 12% of a black pigment, 1 to 2% of an additive, 1 to 2% of alcohol, 3 to 8% of vinyl acetate, 25 to 30% of methyl vinyl ketone and 33 to 38% of toluene. The novel HS white gravure ink can be prepared into sticky ink after being attached with a heat-sealing material, saves processes, reduces the number of product layers, has a downy tactility and broadens a use range.

The invention discloses a catalyst for immobilized MPV reaction. The catalyst has a structure based on a styrene/methyl vinyl ketone copolymer skeleton, and the structure is as follows: a block representing repeated styrene-methyl vinyl ketone The copolymer structural unit, the block copolymer structural unit of styrene-methyl vinyl ketone is expressed as n=17-27, and the weight-average molecular weight of the catalyst is 3000-5000. Polystyrene-methyl vinyl ketone is obtained by copolymerization of styrene and methyl vinyl ketone, and then hydroxyl polymer is obtained under the action of sodium borohydride and other reducing agents, and finally reacted with aluminum powder to obtain immobilized aluminum alkoxide Structural Catalyst. The catalyst is applied to the selective hydrogen transfer of citral to produce nerol and geraniol, the reaction selectivity is >99%, and the yield is as high as 95%. After the reaction was completed, the catalyst was recovered by filtration, and the activity was not significantly decreased after being recycled for 10 times.

The present invention provides a benzyl acetone synthesis method, which comprises: (1) adding a catalyst and first part of benzene to a reactor, and uniformly stirring at a temperature of -5-35 DEG C; and (2) adding the mixture of methyl vinyl ketone and second part of benzene to the reactor of the step (1), carrying out a reaction for 1-5 h at a temperature of -5-35 DEG C, carrying out water washing, recovering benzene, and distilling to obtain the benzyl acetone. According to the present invention, the intermediate link is eliminated, the operation is simple, the reaction time is short, the energy consumption for the temperature control is saved, and the raw materials are easy to obtain so as to further reduce the production cost.