54 results about "Propylene glycol preparation" patented technology

The invention discloses a preparation method of polytrimethylene terephthalate oxalate copolyester, that is, oxalate is used as a comonomer to prepare polypylene terephthalate with terephthalic acid and its ester, and 1,3-propylene glycol Propylene glycol dicarboxylate copolyester. The copolyester has a melting point of 180-220°C, an intrinsic viscosity of 0.7-1.5dL/g, and is biodegradable. The preparation method of the invention is simple, the raw material cost is low, and the difference between product performance and PTT is small. Copolyesters can be used in the manufacture of fibers, films and other plastics.

The invention discloses a method for preparing propylene glycol from propylene. The method comprises a step that: under the existence of a titanium silicalite molecular sieve composite catalyst, propylene and hydrogen peroxide are directly subject to an epoxidation and ring-opening hydration one-step reaction in a reactor, such that propylene glycol is prepared. The catalyst is composed of titanium silicalite molecular sieve, acidic molecular sieve and resin. According to the invention, a fixed-bed propylene glycol preparation technology is realized by using the titanium silicalite molecular sieve composite catalyst, wherein propylene glycol directly prepared from propylene. Traditionally, propylene is subject to epoxidation, such that propylene oxide is produced; and propylene oxide is subject to ring-opening hydration, such that propylene glycol is prepared. With the method provided by the invention, problems such as complicated reaction steps and high energy consumption of the traditional two-step reaction are solved, and the reaction efficiency is improved.

The invention relates to the technical field of catalyst synthesis, in particular to a zinc trifluoromethanesulfonate-loaded spherical mesoporous material, and a preparation method and application thereof. The mesoporous material serves as a catalyst which is used for a reaction process for preparing cyclohexanone-1,2-propylene glycol from cyclohexanone and 1,2-propylene glycol. The mesoporous material has the advantages of high conversion rate of a reactant after a catalytic reaction, a small number of side reactions, high product purity, high conversion rate after repeated use and environmental friendliness.

The invention discloses a preparation method of ultrafine heavy calcium carbonate. Through use of an antioxidant, mica powder and propylene glycol in preparation, the heavy calcium carbonate has the particle size of 0.5-10 microns and strong weatherability, can still be used under ultimate temperature conditions and can be used for multiple industries such as spinning, medicines and coatings.

The invention discloses a loop reactor for preparing 1, 3-propylene glycol and a preparation method of 1, 3-propylene glycol. According to the loop reactor, the ratio of an inlet section opening innerdiameter to a nozzle inner diameter to an air chamber closing opening inner diameter to a mixing section inner diameter to a diffusion section length is 38: (1.5-5): (2-8): (10-50): (600-1700), and the opening angle of the diffusion section is 8-45 degrees. The loop reactor is adopted to perform glycerol hydrogenation preparation, so that the utilization rate of the catalyst, the conversion rateof reactants and the selectivity of the target product 1, 3-propylene glycol are improved.

The invention discloses a making method of polyterephthalic acid propanediol ester, which is reacted by terephthalic acid and 1, 3-methyl glycol, wherein the catalyst is salt generated by tin (II) compound and organic diacid with general formula I or II or corresponding acid anhydride; the tin (II) compound is one of stannous oxide, stannous chloride, stannous bromide, stannous iodide, stannous sulfate, stannous carbonate, stannous hydroxide, stannous caprylate and stannous acetate; n in the formula I is 0-16; R1 and R2 is H, halogen (Cl, Br, I) or alkyl with carbon atom number at 1-6; two carboxyls in the formula II display at adjacent position, interposition or contraposition with other replaced base L on the other positions on the phenyl ring; L is Cl, Br, I, nitro or alkyl with carbon atom number at 1-6.

The invention relates to the technical field of preparation of organic adjuvants for polyvinyl chloride (PVC) plastic, in particular to a preparation method of a flame-retardant and damp-proof heat stabilizer. According to the preparation method, hydrotalcite powder is modified, and then is uniformly dispersed in a PVC material, so that the flame retardancy of the heat stabilizer is improved; thehydrotalcite powder, plant oil and yoghourt are fermented together; under the action of microorganisms, an ester group is grafted to the surface of the hydrotalcite powder to endow the hydrotalcite powder with a waterproofing capacity, so that the damp-proof performance of the heat stabilizer is improved; ethyecellulose, castor oil, silicon oil and propylene glycol are prepared into emulsion, anda green body is soaked in the emulsion; aluminium hydroxide is added for reaction; during decomposition, a large amount of heat is absorbed, so that rise of temperature of a matrix is suppressed; furthermore, a layer of water vapor for isolating oxygen is formed on the surface of the material, and the flame retardancy of the heat stabilizer is improved; the preparation method has a wide application prospect.

The invention belongs to the technical field of food preservation and discloses a fresh noodle preservative and a preparation method thereof. The fresh noodle preservative is prepared from 1-2 parts of glycerol monocaprylate, 2-5 parts of antioxidant composition, 3-8 parts of citric acid, 1.5-3 parts of sorbitol, 0.5-2 parts of propylene glycol, 2-5 parts of sodium chloride, 1-2 parts of carboxymethyl cellulose and 2-4 parts of dietary alkali. The preservative has the effects of synthesizing and enhancing vitamin C by adopting the combination of a bacteriostatic agent, antioxidant and auxiliaries, has simple formula, simple production process, low cost and convenience in use, has low price but remarkable preservation effect, completely accords with the national food hygienic safety standard and can meet the requirement of industrial production. Furthermore, high purity glycerol monocaprylate and propylene glycol can be obtained by a glycerol monocaprylate preparation method and a propylene glycol preparation method, and the high-quality preservative can be prepared.

The invention discloses a preparation method of LTCC dielectric paste sintered to be transparent after casting. The preparation method comprises the following steps: in the dispersion process of YBS (Yttrium Brominated Styrene) series glass ceramic powder, replacing conventional isopropanol with carbon tetrachloride, and adding diallyl phthalate and 1, 3-propylene glycol after secondary ball milling dispersion is finished to prepare the dielectric paste. The ceramic tape sintered after casting of the LTCC dielectric paste prepared by the method is colorless and transparent, the ceramic substrate can be prepared after the ceramic tape is processed, the defects of the sintered substrate can be visually judged, the defects such as unevenness, breakage and bubbles can be timely terminated, the next step of electrical property, adhesive force and durability test is not needed, the cost waste is avoided, the loss can be effectively stopped, the tensile strength, bending strength and dielectric property of the ceramic tape are not influenced, the lower dielectric loss can be ensured, and the dimensional stability is also ensured.

The invention provides a propylene glycol preparation method. The method is characterized in that epoxypropane and water contact with a catalyst under hydrolysis reaction conditions, wherein the catalyst contains an unloading agent, and the unloading agent is an unloading agent of a reaction device adopting titanium silicate molecular sieve as a catalyst and/or a regenerated unloading agent of the reaction device adopting the titanium silicate molecular sieve as the catalyst. The method has the advantages of mild reaction conditions, high epoxypropane conversion rate, high propylene glycol selectivity, environmental protection, no special production device requirements, simple control of the process, and facilitation of industrial production and application.

The invention provides cape jasmine flower essence. The cape jasmine flower essence is prepared from 10% leaf alcohol, 10% cis-3-hexenyl acetate, 10% methyl 2-nonynoate, 10% dihydrojasmone, 10% rose oxide, 10% indole, 10% dodecyl aldehyde, 10% undecenal, undecan-4-olide, terpineol, linalool, michelia alba leaf oil, methyl dihydrojasmonate, alpha-hexylcinnamaldehyde, benzyl acetate, ionone, methylionone, phenethyl ethanol, phenylacetaldehyde, phenylethyl acetate, styralyl acetate, 1-phenylethyl propionate, tetrahydrogeraniol, rhodinol, dihydromyrcenol, lily aldehyde, benzyl propionate, isoeugenol, eugenol, lyral, galaxolide, ylang-ylang oil, patchouli oil and propylene glycol. The cape jasmine flower essence has sweet and rich fragrance of cape jasmine flowers and coordinated and long-lasting fragrance.

The invention discloses modified quartzite resin as well as a preparation method and the application thereof, and belongs to the technical field of synthesis of artificial quartzite. According to thepresent invention, propylene glycol and terephthalic acid are adopted to improve quartzite resin, the quartzite resin prepared from propylene glycol has a light yellow color, is not easily colored when blended with various pigments, and has characteristics of beautiful appearance and soft tone, the propylene glycol price in China continuously rises at present, and the cost is continuously increased. The quartzite type resin prepared from neopentyl glycol has lower thermal deformation temperature and lower curing shrinkage rate, is not resistant to high temperature, is not easy to demould, is long in reaction period of the preparation process, and wastes manpower and material resources. According to the invention, propylene glycol and neopentyl glycol are completely replaced by a specific amount of methyl propylene glycol, so that the artificial quartz stone resin with color, mechanical properties and processability close to those of natural quartz stone is obtained, the processing period is remarkably shortened, and the production efficiency is improved.

The invention provides an MCM-41/Sn-Pd catalyst as well as a preparation method and application thereof. An alkaline molecular sieve MCM-41-doped tin-supported nano-metal particle palladium (MCM-41/Sn-Pd) catalyst is prepared by virtue of a chemical reduction method and is used for preparing pyruvic acid in a high pressure through catalytic oxidation of 1.2-propylene glycol. The catalyst is high in dose activity and can be used for preparing pyruvic acid under experiment conditions in high-yield and high-selectivity manners.

The invention discloses a methanol wax removal film separator and a method for methanol wax removal. A polar selective permeable film is mounted on the novel methanol wax removal film separator and prepared from polyacrylic acid and 1, 3-propanediol. The film is applied into the methanol wax removal film separator, polar small molecule substances such as methanol can selectively penetrate, productmethanol side-reaction product wax substances in methanol synthesis can be separated, methanol quality is improved, production energy consumption is reduced, and the problem of blocking of a pipelinecaused by wax precipitation is effectively prevented. A film preparation process is simple, selected materials are low in price, and the film has high selectivity, large flux and great development potential.

The invention relates to a preparation method of 3,3,3-trifluoro-1,2-propylene glycol, and belongs to the technical field of fluorine chemical industry. The preparation method of 3,3,3-trifluoro-1,2-propylene glycol comprises the steps: carrying out cycloaddition reaction on trifluoroepoxypropane serving as a raw material and carbon dioxide in the presence of a solid catalyst to obtain an intermediate product trifluoromethyl ethylene carbonate; and adding fluorine-free monohydric alcohol into a reaction kettle, and carrying out transesterification on the fluorine-free monohydric alcohol and trifluoromethyl ethylene carbonate to obtain diester carbonate and 3,3,3-trifluoro-1,2-propylene glycol. The related raw materials and process are safer, the reaction is carried out in the same reaction kettle in two times, but only one heterogeneous catalyst is needed, and the whole reaction is mild in condition, short in reaction time, high in yield, free of solvent and few in side reaction. The used catalyst is a heterogeneous solid catalyst, has high gas-liquid phase and liquid-liquid phase catalysis efficiency, can be repeatedly used, is easy to separate from a reaction system after the reaction is completed, and is suitable for large-scale industrial production.

The invention relates to a catalyst for preparing benzene dicarboxylic acid methyl glycol, which uses benzene dicarboxylic acid and 1, 3-methyl glycol, wherein said catalyst is beryllium organic tin compound, whose formula is [R2SnML]2; R is alkyl group, etc; M, L is replace group, as halide, hydroxyl group, alkoxy, phenoxy, etc; M and L can be same or different.

The invention relates to a preparation method and application of a catalyst and belongs to the field of material preparation. The preparation method mainly comprises the following steps: 1, preparingFe3O4; 2, preparing HAP@Fe3O4; 3, preparing Au@Pt; 4, preparing a catalyst Au@Pt/HAP@Fe3O4; and 5, preparing lactic acid through catalysis of 1,2-propanediol. The HAP@Fe3O4 loaded Au@Pt catalyst is prepared by a sol fixation method, and 1,2-propanediol is catalyzed at normal pressure to prepare lactic acid. The catalyst is low in consumption, can be highly actively and selectively used for preparing lactic acid at normal pressure and has a favorable catalytic life. Meanwhile, owing to existence of Fe3O4, the catalyst can be reclaimed easily by use of the magnetism of Fe3O4 and re-utilized.

The invention provides a medicinal patch for treating cough and asthma and a preparation method thereof. The medicinal patch comprises a TPU film coated with a pressure-sensitive adhesive, a Pe film, a medicinal preparation and a release film, wherein the medicinal preparation is prepared from extract, gel, borneol, Span 60 and propylene glycol; the extract is prepared from bulbus fritillariae cirrhosae, semen armeniacae amarae, platycodon grandiflorum, rhizoma zingiberis and liquorice; and the gel is prepared from xanthan gum and konjac powder. The method for preparing the medicinal patch for treating cough and asthma comprises the steps: preparing the extract, preparing the gel, preparing the medicinal preparation and finally preparing the medicinal patch. According to the medicinal patch prepared by the invention, the gel serves as a drug carrier, the active ingredients easily efficiently permeate into skin to exert the drug effects under the effect of the borneol penetration enhancer, and the medicinal patch has the advantages of low sensitization, small skin irritation, good skin adhesion and difficulty to drop.

The invention discloses a Cu/Cr-based composite metal oxide catalyst, a preparation method of the Cu/Cr-based composite metal oxide catalyst and application of the Cu/Cr-based composite metal oxide catalyst in preparation of 1, 2-pentanediol from ethanol and 1, 2-propylene glycol. The catalyst is represented as Cum1Crm2Xm3Om4, m1, m2 and m3 are respectively molar ratios of metal Cu, Cr and X active components, and m4 is the chemical oxygen demand of the stoichiometric ratio. Wherein m1 is in the range of 0.1 to 10, m2 is in the range of 0.1 to 10, m3 is in the range of 0 to 5, and m4 is the chemical oxygen demand of the stoichiometric ratio. The invention provides a new preparation route of bio-based 1, 2-pentanediol by taking rich and cheap low-carbon alcohol as a raw material, and solves the problems that the price of raw materials in the existing 1, 2-pentanediol production technology is high, and the existing 1, 2-pentanediol production technology is generally complicated in process flow, relatively high in production cost, serious in equipment corrosion and the like. According to the non-noble metal copper/chromium-based catalyst, efficient conversion of 1, 2-propylene glycol under mild conditions is achieved, the selectivity of the target product 1, 2-pentanediol can reach 60% or above, and the catalyst has the advantages of being easy to prepare and low in price.