42results about How to "High degree of esterification" patented technology

A method for preparing n-3PUFA marine glyceride through adopting enzyme method includes following steps: refined fish oil is made into n-3PUFA condensate through saponification, acidification and urea adduct method; lipase catalyzes the synthesis reaction between n-3PUFA and glycerol; n-3PUFA marine glyceride is extracted and separated; moreover, n-3PUFA is effectively concentrated in glyceride to be made into functional products which can prevent and cure cardiovascular diseases and nourish the brain and improve intelligence. The raw material of the invention, n-3PUFA, is extracted from natural fish oil, thereby being safe and effective; during production, nitrogen protection is adopted without adding synthetic antioxidant, thereby effectively preventing oxidation of n-3PUFA; with scientific and reasonable technique, the invention completes synthesis by means of biological enzyme method along with high esterification degree of reaction, higher utilization rate of raw material and easily controlled reaction process; therefore, the invention has wide market prospect.

A process for esterification of carbonyl compounds is provided. The process forms a mixture of a carbonyl compound and an inorganic phosphorous compound. An inorganic base can be added to the mixture. The mixture is filtered and an alcohol and a titanate catalyst are added to the filtrate. The mixture is esterified at an elevated temperature.

The invention discloses a method for extracting orange peel pectin by softening orange peels and inactivating pectinesterase. The method comprises the following step of: soaking fresh orange peels in a mixed solution which is obtained by proportionally mixing sodium hexametaphosphate, citric acid and sodium dihydrogen phosphate, to perform tissue softening treatment and pectinesterase inactivation treatment. The mixed solution contains, per 100 g, 41 g of sodium hexametaphosphate, 40 g of citric acid and 20 g of sodium dihydrogen phosphate. By the above treatments, the molecular weight of the pectin extracted from orange peels is increased and the quality is improved. The orange peel pectin is decolorized by macroporous absorption resin AB-8 to greatly improve the color of the pectin. Besides, during alcohol precipitation, the pH value of the solution is adjusted to 3.5, so as to optimize the sedimentation coefficient of the orange peel pectin and thus to increase the pectin yield.

The invention discloses a preparation method of biobased pentaerythritol fatty acid ester, which belongs to the technical field of esterification and synthesis in organic chemistry. Specifically, pentaerythritol is mixed with biobased fatty acid, flowing degassing is performed under a negative pressure condition for an autocatalytic esterification reaction, and refined processes of separation dealcoholization, distillation deacidification and the like are performed, so as to obtain biobased pentaerythritol fatty acid ester. The preparation method has the advantages that a catalyst does not need to be added in the autocatalytic esterification reaction, thereby preventing a residual catalyst existing in a combined-state form in product molecules in a synthesis process of the traditional catalytic esterification technology commonly adopted at present from affecting the overall performance of a product; separation and purification processes are simple, and are controlled easily; the degree of esterification is high, side reaction is less, and the product purity is high; the high-temperature stability of the product is good.

The invention provides a method for extracting pectin in passiflora edulis peel through a microwave-assisted enzymatic method. The method is characterized in that parameters of a technology for extracting the pectin in the passiflora edulis peel by taking passiflora edulis peel as a raw material and adopting the microwave-assisted enzymatic method are as follows: a material-liquid ratio is 1 g/mL:30 g/mL, the microwave time is 3 minutes, the pH (Potential of Hydrogen) of enzyme extraction is 6.0, the concentration of cellulase is 0.4 g/100 mL, the enzyme extraction temperature is 45 DEG C, andthe enzyme extraction time is 3 hours. The extraction rate, the esterification degree, the total galacturnic acid content, the gelatinous degree, the expansion force and the water-retaining capacityof the pectin extracted through the extraction method are all higher than those of passiflora edulis peel pectin extracted through a traditional acid extraction method, and the pectin belongs to high-ester pectin (the esterification degree is greater than or equal to 50 percent). The pectin is applied to preparation of jelly and fruit soft sweets, and better pectin quality is expressed.

There is provided a hard panned coating, and a hard panned confection comprising an edible core coated with the same. The hard panned coating comprises multiple sugar syrup layers, only some of which further comprise one or more sucrose esters. In some embodiments, titanium dioxide may be excluded from the sugar syrup/sucrose ester layers. In these, and other, embodiments, the hard panned coatings exhibit one or more L*, a* and b* values within 5% of the corresponding value of a colorant overcoat applied over a precoat comprising titanium dioxide. Raw material cost savings are thus provided, while yet providing a confection having enhanced properties.

The invention discloses a high esterification degree ethyl alginate preparation method, which comprises: adding alginic acid to anhydrous ethanol, stirring, adding a dehydrating agent having the same molar water content as the alginic acid, adding a catalyst, carrying out stirring heating to achieve a reflux state, adding the remaining dehydrating agent in a dropwise manner when the reflux temperature is achieved, continuously carrying out a reflux reaction for 6-18 h after the remaining dehydrating agent is uniformly added in the dropwise manner within 2-4 h, completing the reaction, cooling to a room temperature, adjusting the pH to 6.5-7.0 with an alkali liquid, filtering, washing the filter cake by using an ethanol aqueous solution with a mass concentration of higher than 60%, and drying at a temperature of 40 DEG C to obtain the ethyl alginate. According to the present invention, with the ethyl alginate preparation method, the esterification degree of the prepared ethyl alginate is higher than 68% and is significantly higher than the esterification degree of the straight chain alkanol ethyl alginate prepared by using the existing technology.

The invention discloses a palmitic acid modified tapioca starch preparation method, which comprises: adding water to a catalyst, controlling the water content of the system at 15-25%, adding the obtained material to tapioca starch, completely mixing, adding a dispersing agent, and mixing; and adding palmitic acid, carrying out a reaction at a temperature of 105-135 DEG C to obtain the palmitic acid modified tapioca starch. According to the present invention, by using the semi-dry process, the occurrence of hydrolysis side reactions can be effectively reduced so as to greatly improve the esterification degree and the reaction efficiency of starch and palmitic acid, the obtained product has advantages of high grafting rate and high reaction efficiency, and the method has advantages of low production cost, simple operation and the like.

The invention discloses a brassylic acid glycidyl ester modified hexamethylenediamine curing agent and a preparation method and applications thereof. The preparation method comprises the following steps: at first, carrying out esterification reactions between brassylic acid and epoxy chloropropane under the effect of a catalyst in a toluene solvent at a controlled temperature of 80-110 DEG C to obtain a chloro-alcohol ester intermediate; mixing the chloro-alcohol ester intermediate with a sodium hydroxide water solution, carrying out cyclization reactions at a controlled temperature of 40-85 DEG C to obtain brassylic acid glycidyl ester; and finally, carrying out amination reactions between brassylic acid glycidyl ester and hexamethylenediamine at a temperature of 60 to 75 DEG C to obtain the brassylic acid glycidyl ester modified hexamethylenediamine curing agent. The prepared brassylic acid glycidyl ester modified hexamethylenediamine curing agent has a high amine value, can be used with epoxy resin (epoxy resin E51, for example) to carry out curing, and has an excellent toughening effect on a cured product. The preparation method has the advantages of simple production technology, convenient operation, high output, and suitability for industrial production.

The invention relates to the technical field of fish gelatin emulsion, in particular to fish gelatin emulsion and a preparation method thereof. The method comprises the following steps: (1) in a solution state, carrying out dynamic high-pressure micro-jet treatment on fish gelatin to obtain a treated fish gelatin solution; (2) contacting the treated fish gelatin solution with an esterification reagent to esterify the fish gelatin; and (3) mixing the fish gelatin esterified in the step (2) with vegetable fat to obtain the fish gelatin emulsion. The fish gelatin and the esterification reagent are used as raw materials, and the high-stability fish gelatin nano-emulsion is prepared by means of a dynamic high-pressure micro-jet technology and an acylation modification technology. The nano-emulsion prepared by the method is high in stability and can be used for nutrition enhancing food.

The invention discloses a dimeric fatty acid-diglycidol ester modified amine hardener, a preparation method and an application. The preparation method comprises the steps: firstly, subjecting dimericfatty acid and epichlorohydrin to an esterification reaction for 1.5 to 3.0 hours in the presence of a catalyst while controlling a temperature to 80 DEG C to 110 DEG C, so as to obtain a chlorohydrinester intermediate; then, subjecting the chlorohydrin ester intermediate and a sodium hydroxide aqueous solution with the mass percent concentration of 20% to 50% for 2 to 5 hours at the temperatureof 40 DEG C to 85 DEG C, so as to obtain a dimeric fatty acid-diglycidol ester; and finally, subjecting the dimeric fatty acid-diglycidol ester and diethylenetriamine to an amination reaction for 1 to4 hours at the temperature of 60 DEG C to 75 DEG C, thereby obtaining the dimeric fatty acid-diglycidol ester modified amine hardener. The obtained dimeric fatty acid-diglycidol ester modified aminehardener has a relatively high amine number and has excellent toughening performance to the hardening of epoxy resin. The preparation process is simple, and the operation is convenient, so that the preparation method is applicable to large-scale industrial production.

The invention discloses a method for extracting pectin from lemon peel and keeping aroma in the pectin. The method comprises the following specific steps: (1) taking the lemon peel as a raw material for crushing; (2) washing with water to remove pigments; (3) sealing and performing reduced pressure distillation; (4) placing supernatant liquid collected in the step (3), namely a pectin extraction solution, in a reduced pressure concentration tank to prepare a pectin precipitate mixed solution; and (5) placing the pectin precipitate mixed solution in a plate and frame filter press for filtration. The method disclosed by the invention adopts a sealing, distillation, concentration and extraction way, and can keep the aroma of fruits in the extracted pectin as much as possible and avoid the loss of the aroma.

The invention discloses a preparation method of octanoic acid starch ester and application of octanoic acid starch ester in pesticide microcapsules. The invention belongs to the technical field of preparation and application of natural polymer materials. The octanoic acid starch ester is prepared by adopting starch as a raw material, adding an auxiliary agent and an octanoic acid esterification agent and adopting a mechanical activation solid-phase technology, and the substitution degree of the octanoic acid starch ester is more than 0.25. The obtained octanoic acid starch ester is applied asa wall material to the field of pesticide microcapsules, and the embedding rate of the obtained pesticide microcapsules exceeds 88.6%. The octanoic acid starch ester is prepared by adopting a mechanical activation solid-phase technology, the method is simple, the obtained material has the characteristics of good film-forming property and low viscosity, the defects of high viscosity, poor fluidityand low solid content of traditional starch can be overcome, and the octanoic acid starch ester is applied to the field of pesticide microcapsules, is green and environment-friendly and plays a role in sustained and controlled release, so that the pesticide utilization rate is increased.

The invention discloses a high esterification degree isopropyl alginate preparation method, which comprises: adding alginic acid to anhydrous isopropanol, stirring, adding a dehydrating agent having the same molar water content as the alginic acid, adding a catalyst, carrying out stirring heating to achieve a reflux state, adding the remaining dehydrating agent in a dropwise manner when the reflux temperature is achieved, continuously carrying out a reflux reaction for 4-15 h after the remaining dehydrating agent is uniformly added in the dropwise manner within 2-4 h, completing the reaction, cooling to a room temperature, adjusting the pH to 6.5-7.0 with an alkali liquid, filtering, washing the filter cake by using an isopropanol aqueous solution with a mass concentration of higher than 60%, and drying at a temperature of 40 DEG C to obtain the isopropyl alginate. According to the present invention, with the isopropyl alginate preparation method, the esterification degree of the prepared isopropyl alginate is higher than 65% and is significantly higher than the esterification degree of the straight chain alkanol ethyl alginate prepared by using the existing technology.

The invention relates to a method using wine grape residues to prepare a leveling agent. The method includes: extracting cellulose in the wine grape residues, and performing esterification. Celluloseextraction is performed on traditional waste grape residues in a wine brewing process after the impurities such as fat-soluble molecules, lignin and hemicellulose of the grape residues are removed, and the low-molecular-weight cellulose after wine brewing fermentation is used to perform esterification reaction so as to prepare the high-quality leveling agent. The prepared cellulose ester-based leveling agent is widely applicable in fields such as car coating, plastic coating and glass coating and is high in leveling level.

A process for utilizing bio-based oils and/or fats for producing biofuels includes the steps of: mixing alcohol with a raw material for forming a reaction mixture; pumping the reaction mixture to a reactor; mixing biogas as a catalyst with the reaction mixture in a selected process step either before or after the supply of the reaction mixture to a high-pressure pump, the biogas including methane and carbon dioxide; adjusting a temperature and pressure of the reactor so that the reaction mixture achieves a supercritical state; esterifying the reaction mixture to produce liquid biofuel and by-products; separating the by-products including methane and alcohol from the liquid biofuel; and recovering separated methane. An equivalent system for utilizing bio-based oils and/or fats for producing biofuels is also disclosed.

The invention belongs to the technical field of pectin and particularly relates to an esterification method of pectin. The esterification method comprises the steps as follows: firstly, pectin is dissolved in water, vacuum freeze drying is performed, and a pectin solid is obtained; the pectin solid obtained through vacuum freeze drying is dispersed in an alcoholic solution in the solid-liquid ratio being 1:(1-50), inorganic acid is added for an esterification reaction, filtration is performed, and esterified pectin is obtained; the alcoholic solution obtained after filtration can be used for the pectin esterification reaction repeatedly. The esterification method has the advantages that the operation is convenient, the alcoholic solution can be recycled repeatedly, and no pollution is caused. The method can be used for preparing pectin esterified products with the esterification degree being 20%-95%, and esterification groups linked with galacturonic acid units correspond to used alcohol types.

The invention discloses a preparation method of functional oligosaccharide glycoside ester. According to the method, functional oligosaccharide and organic acid are subjected to an esterification reaction to generate the functional oligosaccharide glycoside ester. The invention also discloses application of the functional oligosaccharide glycoside ester. According to the functional oligosaccharide glycoside ester prepared by the invention, the organic acid and the functional oligosaccharide can pass through the stomach and the small intestine together to reach the large intestine, and then the intestinal tract releases the oligosaccharide and the organic acid, so that the utilization rate and the use effect of the functional oligosaccharide and the organic acid are improved; and by adding the functional oligosaccharide glycoside ester into an animal daily ration, the feed cost can be reduced, meanwhile, the intestinal health condition of animals is improved, and potential threats to animal health, which is caused by excessive consumption of the organic acid, are reduced. The invention belongs to the technical field of animal feeds, and is used for improving the utilization rate of the functional oligosaccharide and the organic acid in the animal feed.