46results about How to "Promote esterification" patented technology

The invention provides a method for preparing carboxylic ester. After liquid-phase ionic liquid at room temperature is taken as a catalyst and an extracting agent at the same time to catalyze the reaction of olefin and carboxylic acid to generate carboxylic ester, the generated carboxylic ester is separated from carboxylic acid which does not react. During the whole reaction, the molar ratio of carboxylic acid to ionic liquid to olefin in a reaction system is always kept at 0.2-5:1:0.1-10; absolute pressure is controlled between 0.05 and 5.0 MPa; reaction temperature is controlled between 10 and 110 DEG C; and the space velocity of the carboxylic acid added during the reaction is controlled between 0.1 and 500. The method has the advantages of further rasing the conversion rate of carboxylic acid, reducing production cost and reducing pollution caused for environment.

The invention belongs to the technical field of liquor aging and particularly relates to a liquor aging device. The liquor aging device comprises an aging barrel externally wound with an electromagnetic induction coil, wherein an alternating current power supply is connected to the end part of the electromagnetic induction coil, a stirring rod is arranged in the aging barrel, an interlayer is arranged in the middle of the bottom of the aging barrel, and a magnet is arranged in the interlayer; the stirring rod is a conductor and is externally sleeved by a heat-conducting stirring sleeve, and anion oxidizing particles are arranged between the stirring rod and the stirring sleeve; and a chassis is connected to the bottom end of the stirring rod in a rotating way, stirring blades are fixedly mounted on the chassis, and a filtering hole with the diameter smaller than diameters of the anion oxidizing particles is formed in the outer wall of the stirring sleeve. According to the liquor aging device, the problem that the aging effect is poor when air is directly introduced into the liquor is solved.

The invention provides a high-heat-resistant amorphous polyester preparation method, which comprises: using terephthalic acid and ethylene glycol as main reaction raw materials, adding modified monomers 1,4-cyclohexane dimethanol and spiro diol, and carrying out direct esterification by using a tin / phosphorus / antimony composite catalyst to prepare the high-heat-resistant amorphous polyester. According to the present invention, the tin compound is added as the esterification catalyst at the esterification stage, the phosphorus compound is added to passivate the tin catalyst after the esterification is completed, and the antimony-based catalyst is added as the condensation polymerization catalyst, such that the catalysis effect of the tin compound to the esterification reaction can be ensured, and the problems that the tin catalyst as the condensation polymerization catalyst can yellow the polyester to cause the poor thermal stability of the product can be avoided.

The invention belongs to the technical field of wine brewing, and discloses tartary buckwheat white spirit and a brewing process thereof. From the perspective of a brewing process of the tartary buckwheat white spirit, tartary buckwheat rice is used as a raw material, and through emulsion adjustment, roller curing, pH value adjustment, fermentation, distillation and the like, the tartary buckwheatflavor of the tartary buckwheat white spirit is effectively enhanced, and the liquor yield is increased, wherein an organic acid solution is added during emulsion mixing, starch is promoted to be decomposed into micromolecular sugar, fermentation is facilitated, organic acids react with alcohol, generated ester substances can effectively improve the fragrance of the white spirit, the flavor of the buckwheat flavor of the tartary buckwheat white spirit is enriched, and the sweetness of the tartary buckwheat white spirit is also improved due to addition of the organic acid; a roller drying andcuring technology is used for quickly curing the raw materials, so that the generation of sugar is facilitated, and the yield of the white spirit is increased; liquid state fermentation is adopted, sothat the tartary buckwheat white spirit has a unique tartary buckwheat flavor; the fermentation product vinasse liquid is used for replacing traditional water for the first time, esterification of alcohol and acid is effectively promoted, aroma production is enhanced, and the aroma of the wine body is enhanced.

The invention belongs to the technical field of enzyme engineering, and discloses marine-derived high temperature lipase as well as crystals and a preparation method thereof. The amino acid sequence of the marine-derived high temperature lipase is shown in SEQ ID NO. 1. The preparation method of the marine-derived high temperature lipase comprises the steps of cloning a sequence of the marine-derived high temperature lipase into a pET22b(+) prokaryotic expression vector and transferring the vector into escherichia coli competent cells Rosetta (DE3) for expressing, and purifying by means of affinity chromatography and exclusion gel chromatography to obtain a marine-derived high temperature lipase aqueous solution. The lipase provided by the invention has very good high temperature and organic solvent tolerance, has high efficiency in esterification and hydrolysis of lipids, and is even better in effect of esterification synthesis of triglyceride than commercial lipase 435 (novozymes).

The invention belongs to the technical field of liquor aging and particularly relates to a liquor aging device. The liquor aging device comprises an aging barrel externally wound with an electromagnetic induction coil, wherein an alternating current power supply is connected to the end part of the electromagnetic induction coil, a stirring rod is arranged in the aging barrel, an interlayer is arranged in the middle of the bottom of the aging barrel, and a magnet is arranged in the interlayer; the stirring rod is a conductor and is externally sleeved by a heat-conducting stirring sleeve, and anion oxidizing particles are arranged between the stirring rod and the stirring sleeve; and a chassis is connected to the bottom end of the stirring rod in a rotating way, stirring blades are fixedly mounted on the chassis, and a filtering hole with the diameter smaller than diameters of the anion oxidizing particles is formed in the outer wall of the stirring sleeve. According to the liquor aging device, the problem that the aging effect is poor when air is directly introduced into the liquor is solved.

The invention relates to a cellaring method of Maotai-flavor liquor. The cellaring method comprises the following steps of: (1) selecting and packaging a liquor storage device: selecting a ceramic container as the liquor storage device, and adopting a breathable film and straw as packaging materials; adding brewed finished liquor into the liquor storage device, sealing by adopting the breathable film, and then attaching a layer of straw; (2) carrying out secondary sealing: coating the surface of the liquor storage device with a mud layer by adopting viscous composite pit mud; (3) treating a cellaring room: selecting an underground layer as the cellaring room, and paving a layer of composite paving material with the thickness of 8 to 10cm on the cellaring room; coating the wall of the cellaring room with the composite pit mud; and (4) cellaring: orderly placing the sealed liquor storage device on the composite paving material, controlling the humidity, and cellaring. According to the cellaring method provided by the invention, the content of harmful substances in the Maotai-flavor liquor can be effectively reduced, the content of beneficial components in the liquor is increased, andthe quality of the Maotai-flavor liquor is improved; moreover, the cellaring time is short, and the production cost is lower.

The invention relates to the technical field of PBAT / PLA (poly(butyleneadipate-co-terephthalate) / polylactic acid) blend compatibilization, particularly a controllable-degradation PBAT / PLA composite film. The controllable-degradation PBAT / PLA composite film comprises the following components in parts by weight: 50-60 parts of PBAT, 10-30 parts of PLA, 10-20 parts of calcium carbonate, 0.5-2 parts of antibacterial compatibilizer and 0.5-2 parts of tetrabutyl titanate. The mass ratio of the PLA to the calcium carbonate is (1-3):1. The PLA / calcium carbonate proportion is strictly controlled and restricted within the range of (1-3):1; and the PLA / calcium carbonate proportion can be regulated to control the degradation start time of the PBAT / PLA composite film at 60-90 days and control the complete degradation time at 120-150 days.

The invention relates to the technical field of PBAT / PLA (Polybutylene Terephthalate / Polylactic Acid) blending and compatibilization and in particular relates to an antibacterial PBAT / PLA composite film. The antibacterial PBAT / PLA composite film is prepared from the following components in parts by weight: 94 to 98 parts of PBAT / PLA, 0.5 to 2 parts of an antibacterial compatibilizer, 0.5 to 2 parts of tetrabutyl titanate and 1 to 2 parts of a lubricant, wherein the PBAT / PLA is prepared from the following components in parts by weight: 60 to 80 parts of PBAT and 20 to 40 parts of PLA. According to the antibacterial PBAT / PLA composite film provided by the invention, after the antibacterial compatibilizer and the tetrabutyl titanate are added into a PBAT / PLA blending system, the compatibility of the system can be greatly improved, and addition of additives including a low molecular weight light stabilizer, an antibacterial agent and the like can be avoided; problems that lower molecular substances have penetration and transport phenomena in a material utilization and storage process, and the performance of the material are reduced are effectively avoided.

The invention discloses a method for catalyzed synthesis of vinpocetine by using solid acid and alkali. The method comprises the following steps: 1, carrying out hydrolysis of solid alkali, namely feeding a vincamine ethanol solution to a solid alkali hydrolysis column to carry out a hydrolysis reaction; 2, dewatering by a molecular sieve, namely carrying out a dewatering reaction on the hydrolyzed vincamine ethanol solution through a molecular sieve dewatering column; and 3, dewatering and esterifying solid acid, namely feeding the dewatered feed liquid to a solid acid dewatering and esterifying column to carry out solid acid dewatering and esterifying. Strong alkali instead of sodium hydroxide is adopted to catalyze hydrolysis of vincamine; and solid strong acid instead of concentrated sulfuric acid is used for carrying out dewatering and esterifying, so as to obtain the vinpocetine. A catalyst used by the method can be conveniently separated from a product, so that the production cost is reduced. According to the method disclosed by the invention, no acid-alkali wastewater is generated in the production process; the method is environment-friendly and more suitable for industrial production, and can be repeatedly used; the production cost can be effectively reduced; and the used solid acid and alkali are free of corrosion on equipment, environment-friendly, and do not generate acid-alkali wastewater.

The invention discloses a polyester waste heat utilization device. The invention aims to provide a polyester waste heat utilization device capable of comprehensively utilizing heat. The polyester waste heat utilization device comprises a reflux water storage tank, a reflux water delivery pump, an air cooler, a technological tower, a filament air conditioning unit, a hot water type lithium bromide refrigerator, a heat exchanger I, a heat exchanger II, a heat exchanger III, a heat exchanger IV, a pneumatic valve, a water inlet manifold and a return water manifold. The polyester waste heat utilization device has the characteristics of being simple in structure, high in waste heat utilization rate and the like.

The invention relates to a non-stirred dual-zone polyester esterification kettle. The first esterification zone is naturally circulated by density difference, and the esterification product is used to dissolve PTA powder to realize a homogeneous reaction; The circle guides the flow of the ring plate to realize the push flow and make full use of the reaction driving force. The rate of esterification out of the still can reach 96.5-97%.

The invention relates to a preparation method of (methyl)acrylate substances and application of 2-acrylamide-2-methylpropanesulfonic acid. The invention also discloses application of the 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as a catalyst to esterification reaction. The inventor of the invention finds that the 2-acrylamide-2-methylpropanesulfonic acid (AMPS) can be used as a catalyst tocatalyze an esterification reaction, and has good catalytic activity and high yield. When the 2-acrylamide-2-methylpropanesulfonic acid is applied to preparation of (methyl)acrylate substances, the process is simple, the catalytic effect is good, and 2-acrylamide-2-methylpropanesulfonic acid and (methyl)acrylic acid are dissolved in the esterification process, so that esterification is facilitated. Besides, the solubility of the 2-acrylamide-2-methylpropanesulfonic acid at a low temperature is low, and cooling is carried out after the esterification reaction, thus the 2-acrylamide-2-methylpropanesulfonic acid is crystallized and separated out due to the reduction of the solubility, and the 2-acrylamide-2-methylpropanesulfonic acid can be recycled through filtration and separation.

The present invention provides an improved system and method for the rapid production of distilled spirits with characteristics associated with relatively lengthy maturation processes. The method involves contacting wood with undistilled spirits under heat and exposing the resulting heat-treated spirit to actinic light. The present invention provides embodiments for the continuous processing of wine by thermal and actinic light treatments. The present invention also provides embodiments in which the heat-treated wine is mixed with wine that has been individually burnt out to obtain the characteristics of a mature wine.

The invention discloses a flavor compound bacterial agent for reducing fusel oil of fermented grains, which is prepared by the following method: (1) preparing a suspension of Aspergillus oryzae spores, cyanobacteria, and Bacillus licheniformis; (2) using polyvinyl alcohol (PVA ) and carboxymethyl chitosan (CMCS) as the wall material, glutaraldehyde (GA) as the cross-linking agent to prepare mid-logarithmic Saccharomyces cerevisiae suspension containing polyoxyethylene sorbitan monostearate; (3) Hydroxypropyl methylcellulose embeds the water-soluble extract of the esterified red yeast rice lysate; (4) The corncob is used as a carrier to carry fermentation microorganisms and auxiliary materials to form a composite microbial agent. The compound microbial agent can effectively reduce fusel oil, and also has good effects in improving liquor yield, ester flavor, amino acid nutrition and sensory.