418 results about "Dimethyl ester" patented technology

The invention discloses a flame-proof electrolyte and its lithium battery for secondary lithium battery, which is characterized by the following: adopting one or more phosphosubester (such as methyl acid phosphate dimethyl ester, ethyl phosphate diethyl ester and its derivant) as pure solvent or solvent component; reducing the price of electrolyte with incombustibility, low toxicity and high conductivity; improving the combusting safety effectively.

The invention discloses a making method of 3.4.3'.4'-biphenyl tetracarboxylic dianhydride, which comprises the following steps: adopting 4-chlorophthalandione anhydride as raw material; preparing 4-chlorophthalandione dimethyl ester, 3.3'.4.4'-biphenyl tetracarboxylic tetramethyl ester, 3.3'.4.4'-biphenyl tetracarboxylic acid and 3.3'.4.4'-biphenyl tetracarboxylic dianhydride; coupling; hydrolyzing; refining; (1) adopting p-toluenesulfonic acid as esterifying catalyst in the preparing procedure of 4-chlorophthalandione dimethyl ester; (2) adopting acetonitrile as solvent in the coupling procedure; (3) purifying hydrolytic 3.3'.4.4'-biphenyl tetracarboxylic acid through deionized water in the refining procedure; (4) washing and purifying 3.3'.4.4'-biphenyl tetracarboxylic dianhydride through acetone.

The invention discloses a preparation method of cationic dyeable flame-retardant polyester resin. The manufacturing method is characterized by comprising the following steps: performing an esterification reaction on a halogen-free copolymerized phosphorus-based flame retardant, ethylene glycol and a composite catalyst to prepare an esterification solution of the halogen-free copolymerized flame retardant; performing ester exchange reaction on sulfoisophthalic acid dimethyl ester and the ethylene glycol to prepare a sulfonate-based bis(hydroxyethyl) isophthalate solution; performing an esterification reaction on terephthalic acid (or dimethyl terephthalate), the ethylene glycol and auxiliaries, then adding a catalyst, a stabilizer, the auxiliaries, the esterification solution of the phosphorus-based flame retardant (or a prepolymer solution of the phosphorus-based flame retardant) and the sulfonate-based bis(hydroxyethyl) isophthalate solution, performing condensation polymerization reaction, and cooling and dicing after the end of reaction to prepare the cationic dyeable flame-retardant polyester resin. The cationic dyeable flame-retardant polyester resin prepared by the method disclosed by the invention has the characteristics of good spinnability, polyester fiber cationic dye boiling dyeing under normal pressure conditions, complete chromatogram and strong dye adhesion.

The invention discloses an ester exchange catalysis method. Specifically, phenol, dimethyl ester, a solvent and a catalyst are mixed and subjected to a contact reaction. The method is characterized in that the catalyst is a soluble zinc salt modified heteroatom molecular sieve.

The invention relates to a method for preparing magnetic/hollow double-shell layer print adsorbent by emulsion polymerization and belongs to the technical field of the preparation of environment function materials. Attapulgite is used as stabilizer; a few Fe3O4 nanometer particles are used as a magnetic separation carrier; a dispersion solution of hydrophilic Fe3O4 nanometer particles and attapulgite is used as a water phase; and a mixture of organic solvent hexadecane, cross-linking agent styrene, template molecule cyhalothrin, initiator azo isobutyric dimethyl ester and functional monomers acrylamide and tetra-vinyl pyridine is used as an oil phase. The water phase and the oil phase are mixed to prepare stable oil-in-water emulsion in an ultrasonic manner; and the magnetic hollow double-shell layer print polymer is prepared by emulsion polymerization. The magnetic hollow double-shell layer print polymer can be applied to selective recognition and separation of cyhalothrin in an aqueous solution. The magnetic hollow double-shell layer print polymer has a hollow double-layer structure, wherein the hollow structure can be used for effectively increasing adsorption capacity; the strength of the obtained printer polymer is enabled to be high by the inorganic particle layer in the shell layer; and the recognition points are unlikely to be damaged.

The invention belongs to the technical field of catalysts and particularly relates to a low-content supported ruthenium-palladium bimetal hydrogenation catalyst and a preparation method thereof. The preparation method of the catalyst comprises the following steps: preparing a ruthenium monometal solution and a palladium monometal solution; under ultrasonic conditions, supporting the two active components (ruthenium and palladium) of the metal catalyst on the surface of an aluminum oxide carrier by respectively adopting a co-impregnation method and a fractional impregnation method; and washing, drying, roasting, and performing other treatment processes to finally obtain the low-content supported ruthenium-palladium bimetal hydrogenation catalyst. According to the invention, the method is low in cost; and the prepared bimetal hydrogenation catalyst has high selective hydrogenation activity, and shows excellent catalytic activity, favorable catalytic stability and high 1,4-cyclohexanedicarboxylic acid dimethyl ester (CHDM) yield when being used in the reaction process of preparing CHDM through selective hydrogenation of dimethyl terephthalate.

The present invention comprises a blend of polyester and a partially aromatic polyamide with an ionic compatibilizer and a cobalt salt. This blend can be processed into a container that has both active and passive oxygen barrier and carbon dioxide barrier properties at an improved color and clarity than containers known in the art. The partially aromatic polyamide is preferably meta-xylylene adipamide. The ionic compatibilizer is preferably 5-sodiumsulfoisophthalic acid or 5-zincsulfoisophthalic acid, or their dialkyl esters such as the dimethyl ester (SIM) and glycol ester (SIPEG). The cobalt salt is selected form the class of cobalt acetate, cobalt carbonate, cobalt chloride, cobalt hydroxide, cobalt naphthenate, cobalt oleate, cobalt linoleate, cobalt octoate, cobalt stearate, cobalt nitrate, cobalt phosphate, cobalt sulfate, cobalt (ethylene glycolate), or mixtures of two or more of these. The partially aromatic polyamide is present in a range from about 1 to about 10 wt. % of said composition. The ionic compatibilizer is present in a range from about 0.1 to about 2.0 mol-% of said composition. The cobalt salt is present in a range from about 20 to about 500 ppm of said composition.

The invention discloses graphene oxide/aliphatic-aromatic copolyester. The graphene oxide/aliphatic-aromatic copolyester comprises the following raw materials by weight: 0.06 to 0.5% of graphene oxide, 40 to 65% of aliphatic dihydric alcohol, 32 to 57% of diacid or dimethyl ester thereof, 0.01 to 0.2% of a catalyst and 0.01 to 0.18% of a stabilizing agent. A preparation method for the graphene oxide/aliphatic-aromatic copolyester comprises the following steps: pretreatment of graphene oxide; transesterification; and condensation polymerization. The prepared graphene oxide/aliphatic-aromatic copolyester has good conductivity and does not generate static electricity in the production process of a blown film; due to addition of graphene oxide, melt strength is improved, film rupture hardly occurs during processing, and stability of production of a film material is improved.

The invention discloses a lithium ion battery which comprises an anode piece, a cathode piece, an isolation film and electrolyte, wherein the anode piece comprises an anode flow collection body and ananode diaphragm which is attached on the anode flow collection body and contains an anode active substance, the cathode piece comprises a cathode flow collection body and a cathode diaphragm which isattached on the cathode flow collection body and contains a cathode active substance, an electrolyte solvent contains methylphosphoric acid dimethyl ester, and the cathode active substance is lithiumtitanate. In the lithium ion battery, the lithium titanate can not generate a reduction reaction with the methylphosphoric acid dimethyl ester because the platform electric potential of the lithium titanate is about 1.5V (Li+/Li relatively) and is higher than the reduction electric potential of 1.2V (Li+/Li relatively) of the methylphosphoric acid dimethyl ester, and the first-time efficiency andthe capacity of the lithium ion battery are not influenced.

The invention discloses a continuous esterification production method for mixed dibasic acid dimethyl ester. The method comprises the following steps of: (1) pre-esterifying, namely, mixing dibasic acid and methanol in a mole ratio of 1:2-3 and performing pre-esterification at the normal temperature and normal pressure to obtain a pre-esterified material; (2) pre-heating the methanol, namely, pressurizing and pre-heating the methanol to form overheated methanol gas with the temperature of between 145 and 155 DEG C; and (3) continuously esterifying, namely, adding the pre-esterified material into a continuous esterification reactor, of which the middle part is provided with a catalyst reaction bed, from the top, adding the overheated methanol gas into the continuous esterification reactor from the bottom, performing a reverse flow reaction on the ascending methanol gas and the descending pre-esterified material on the catalyst reaction bed, and continuously discharging the mixed dibasic acid dimethyl ester which is generated by the esterification from the bottom of the esterification reactor.

A process for preparing aminoformate from amine and dimethyl carbonate (DMC) features that under the existance of ionic liquid as solvent and catalyst system, the amine and DMC take part in catalytic oxo reaction at 40-200 deg.C for 0.5-5 hr. Its advantages are high output rate (more than 98%), high purity (more than 98%), high reaction activity, and easy recovery and cyclic use of catalyst.

The invention relates to the application of microwave and ultrasonic technologies in synthesizing tiotropium bromide anhydride, in particular to a method for preparing the refined product of a finished product, namely, tiotropium bromide anhydride through crystallization and recrystallization processes by using a crude product of tiotropium bromide prepared through bromization reaction after hydrolytic reaction of scopolamine hydrobromide under microwave function, substitution and coupling reaction of bromothiophene, magnesium, and oxalic acid dimethyl ester under the microwave function, and condensation reaction of scopine and thiophen methyl glycollate under the microwave function. Using the invention to prepare tiotropium bromide anhydride, not only the reaction time is short, the side reaction is less, and the yield rate is high in the room temperature condition, but also the product quality is stable, controllable, safe and effective.

The present invention discloses alkali soluble modified polyester and the preparation method. The production method includes esterification and condensation reactions and is characterized in that in the reaction, terephthalic acid dimethyl ester or terephthalic acid and ethylene alcohol are first component and second component, and m-phthalic acid ester with metallic sulphonate respectively is thirdcomponent; metatitanic acid ester is catalyst, phosphorus compound is stabilizer and alkali metal compound is assistant additive. The polyester copolymer provided by the present invention is characterized in that the viscosity is 0.40 to 0.65dl/g (including 0.40dl/g, 0.55dl/g, 0.65dl/g); wherein, the content of stibium compound is less than or equal to 100ppm in the unit of stibium atom relatively to polyester. The polyester copolymer produced by the present invention has excellent heat resistance, full alkali solubility and good spinning performance.

The invention discloses a method for refining a dibasic acid dimethyl ester plasticizer, which comprises the following steps: dibasic acid dimethyl ester plasticizer crude product is refined by adopting a continuous decompression and rectification light-component and heavy-component removing method, after being filtered, the plasticizer crude product firstly enters a lightness-removing column, the lightness-removing column performs decompression operation to remove light components on the top of the lightness-removing column, the bottom materials of the lightness-removing column enter a weight-removing column to remove weight components, the weight-removing column performs decompression operation to remove monoester and little tar in the plasticizer crude product, and the top of the weight-removing column extracts the refined plasticizer produce. The plasticizer product has high purity, stable quality, lower energy consumption, simple operation and high product yield and reduces the generation of tar and environmental pollution.

The invention discloses a making method of binary acid ester through waste liquid of adipic acid and disposing method of waste liquid, which comprises the following steps: adding concentrated nitric acid into BI waste liquid; decomposing butylacetic acid hydrogen peroxidate into hydroxy capronate under 70-110 deg.c; aerating NO2 into decomposing liquid to trigger oxidization reaction; maintaining temperature between 70 and 110 deg.c; condensing reactant to 20-50%; evaporating DBA waste liquid to 20-50% under normal pressure; flashing with BI oxidizing condensate; cooling to 50-70 deg.c; reacting composite liquid and esterified carbinol with the same weight to extract; washing extracting phase; rectifying in the vacuum under 20-60kPa; rectifying rough composite dibasic acid dimethyl ester under 2-15kPa; evaporating water to 20-50%; circulating in the esterifying autoclave to do secondary esterification; making total transmitting rate of diacid over 90%.