811 results about "Transesterification reaction" patented technology

A system and method for converting a high free fatty acid grease feedstock to biodiesel. The process comprises a glycerolysis reaction to convert free fatty acids to glycerides and a base catalyzed transesterification reaction to produce fatty acid methyl esters and glycerin in the absence of solvents. In preferred embodiments, both glycerin and methanol are recycled. The process can process a feedstock containing up to 100 percent free fatty acid content to produce biodiesel and glycerin with minimal waste generation.

The process of the present invention for producing a polyester resin comprising a dicarboxylic acid constitutional unit and a diol constitutional unit having a cyclic acetal skeleton comprises a step (1) of subjecting a diol (A) having a cyclic acetal skeleton and an ester (D) to transesterification reaction and a step (2) of mainly converting the resultant oligomer into a high polymer. The step (1) simultaneously satisfies the requirements (i) to (iv) as described in the specification. In the process of the present invention, the polyester resins having excellent moldability and mechanical properties are stably produced by a transesterification method which is less detrimental to environments.

A process for synthesizing polyol fatty acid polyesters comprising the steps of (1) mixing ingredients comprising (a) unesterified first polyol having hydroxyl groups, (b) second polyol esterified with fatty acids, (c) basic catalyst, and (d) emulsifying agent to form a mixture of ingredients; (2) reacting the mixture of ingredients at a temperature sufficient to obtain a transesterification reaction products and by-products; and (3) removing at least a portion of the by-products from the transesterification reaction mixture; and (4) further heating the transesterification reaction products and ingredients from step (3) at a temperature and for a time sufficient to esterify at least about 50% of the hydroxyl groups of the first polyol.

A novel oil composition comprises an interesterified structured lipid component, the component being an interesterifcation reaction product of an amount of a medium chain triglyceride, an amount of a long chain domestic oil, and an amount of a conjugated linoleic acid material. The structured lipid component can be used in edible oil compositions. The oil compositions advantageously can contain an amount of a phytosterol ester component, up to about 12 weight percent of the total composition. The oil compositions disclosed herein have good stability and also have other properties useful for an edible oil composition.

A device and method a provided for mixing and enhancing reaction between oil and a non-oil liquid by exploiting the formation, implosion and explosion of numerous cavitation bubbles within a cavitation device. Intense localized energy from the collapse of the cavitation bubbles subjects the mixture to intense heat and pressure, thereby accelerating reaction between the oil and non-oil liquid. In one embodiment, the non-oil liquid is an alcohol, and the cavitation device is used to enhance a transesterification reaction to convert the oil and alcohol into biodiesel in the presence of a catalyst.

The invention relates to a method for preparing biodiesel by utilizing food waste low-cost high-efficiency recycling oil, which is realized by four steps of dining waste oil degumming and impurity removing treatment, acid catalytic esterification reaction, base catalytic transesterification reaction and biodiesel refining. The final product is colourless biodiesel, and all performance indexes can reach the European and American biodiesel quality standard. The invention has the advantages of low production cost, high conversion rate and less pollutant discharge and overcomes the defect of preparation by a single method. When the biodiesel is produced, by-products comprise glycerol and methanol.

The invention provides a preparation method of phosphorus-containing halogen-free environmentally-friendly flame-retardant polyester polyol. The method comprises the steps that with DOPO being starting material, firstly, the DOPO reacts with dibasic acid or dibasic acid anhydride to generate a DOPO complex intermediate; secondly, esterification dehydration reaction is performed on the generated intermediate, small-molecules polyol and dibasic acid or dibasic acid anhydride at 150 DEG C-160 DEG C; after the dehydration reaction is over, the temperature is raised to 200 DEG C-250 DEG C for transesterification, wherein the reaction time is 1 h-3 h, and in this way, the polyester polyol is obtained. The prepared polyester polyol is not conventional polyester polyol but the polyester polyol containing the phosphorus element, has the reactivity with isocyanate and can be used for permanent flame retardant modification of polyurethane products. As the phosphorus element is introduced to the polyester polyol, the polyester polyol contains phosphorus and is free of halogen, environmentally friendly and capable of inflaming retarding.

The present invention relates to a resin composition comprising polyethylene terephthalate and polyethylene naphthalate and a process for preparing the composition. The present invention relates also to a bottle produced from the composition and a process for the preparation of the bottle. The resin composition according to the present invention is prepared by melt-kneading (A) polyethylene terephthalate with (B) polyethylene naphthalate in a proportion of the ethylene naphthalate unit to a total of (A) and (B) of from 5 to 15 mole %, with a kneading extruder in a ratio of an extruder output rate to a screw rotation speed of 0.1 to 1.4 kg/hr.rpm. The present composition gives a bottle superior in transparency and in resistance to heat and pressure despite that it has a transesterification of 20% or lower.

Provided is a method of preparing an ester plasticizer, more particularly, a method of preparing an ester plasticizer including conducting a transesterification reaction of a compound of Chemical Formula 1 with a first alcohol of Chemical Formula 2.

According to the preparation method according to an embodiment of the present invention, an ester plasticizer having high purity, yield, and process efficiency as well as excellent plasticizer properties such as processability and absorption rate may be easily prepared even under no catalyst.

The invention discloses a method for preparing sucrose-6-acetic ester by an enzymatic method, and belongs to the technical field of biocatalysis. In the method, in a non-aqueous medium tertiary butanol-dimethyl sulfoxide system, sucrose and vinyl acetate are catalyzed by lipase to perform a transesterification reaction so as to synthesize the sucrose-6-acetic ester. The method has the advantages of mild reaction condition, high reaction selectivity, single reaction product, high conversion rate, product safety and the like, and provides a novel feasible way for preparing the sucrose-6-acetic ester by a biological method.

A method of improving the mechanical strength of polyurethane foams made from bio-based polyols, the polyol-containing compositions utilized in the method of the invention, and the polyurethane foams produced by the method of the invention are provided. The method of the invention involves the incorporation of aromatic polyester polyol in the polyol-containing composition used to manufacture the foams. In one embodiment, the aromatic polyester polyol is utilized in a polyol-containing composition which is employed in the manufacture of flexible polyurethane foam. In another embodiment, the aromatic polyester polyol transesterified with a natural oil-containing composition to form a transesterification reaction product that is utilized in a polyol-containing composition which is employed in the manufacture of flexible polyurethane foam. Flexible polyurethane foams of the invention exhibit substantial improvements in mechanical strength properties, such as tear strength, tensile strength and elongation relative to foams made from bio-based polyols such as soybean oil-based polyols.

The invention discloses a method for making biological diesel oil by the association of ultrasonic waves and microwaves. The method comprises the following steps: 1. raw oil has free fatty acids removed and undergoes dehydration treatment; 2. mixed liquor of the raw oil, low carbon alcohols and catalysts are put in a reactor and undergo transesterification reaction under the simultaneous actions of the ultrasonic waves and the microwaves; and the mol ratio of the raw oil to the low carbon alcohols is between 1:1 and 1:80, and the mass ratio of the catalysts to the raw oil is between 0.1:100 and 10:100, and the reaction temperature is controlled between 25 and 80 DEG C; 3. after reaction, remained methyl alcohols are evaporated, and reaction products undergo the standing stratification to extract coarse products of the biological diesel oil on the upper layer; 4. the coarse products of the biological diesel oil are purified to obtain the biological diesel oil with high quality. The method has the advantages of high yield, fast reaction speed, short reaction time, low energy consumption, low consumption of the catalysts, low product cost and environmental protection, etc., and is suitable for commercialized production.

This invention discloses a method for extracting high-purity cholesterol from lanolin. The method comprises: (1) dissociating cholesterol from lanolin by transesterification reaction; (2) performing short-path distillation to obtain cholesterol crude product; (3) purifying by silica gel column chromatography; (4) crystallizing to obtain refined cholesterol with purity higher than 95% and yield higher than 70%. The method has such advantages as high product consumption, little pollution, simple process and easy operation, thus is suitable for mass production.

The invention provides a method for preparing oil-based polyol ester by virtue of gutter oil and using the oil-based polyol ester as basic lubricating oil so as to add treatment and utilization channels for gutter oil and realize the high-quality utilization of gutter oil. The method for preparing the oil-based polyol ester by two-step transesterification reaction comprises the following steps: sequentially adding biomass-based raw materials, methanol and a catalyst into a reaction flask, and performing transesterification reaction to obtain biomass-based methyl ester; sequentially adding the biomass-based methyl ester, polyol and a catalyst into the reaction flask, and performing transesterification reaction to obtain biomass-based polyol ester. The biomass-based raw material comprise gutter oil, acid cottonseed oil and vegetable oil foots/soap, and can be utilized in a high-quality manner, and the prepared biomass-based polyol ester can be used as a raw material of biomass-based lubricating oil.

The invention provides a new method for the synthesis of hindered phenols antioxidants. Under the action of a composite catalyst, a compound II and a compound III are subjected to transesterification and byproducts-methanol is obtained via heating and decompression; the rate of conversion of the product is more than 98%, and the compound I of hindered phenols antioxidants is directly obtained without crystallizing and purifying reaction liquid by solvent. The composite catalyst is composed of a primary catalyst of carboxylates of organotin and a secondary catalyst of thioester compounds of phosphite ester. The primary catalyst can be recycled.

Liquid crystal polycarbonates are made by forming a reaction mixture containing (a) an activated diaryl carbonate; (b) at least two species of aromatic diols selected from among resorcinol, 4,4′-biphenol, hydroquinone, methylhydroquinone, 4,4′-dihydroxyphenylether, dihydroxynaphthalene, including in particular the 2,6, 1,5, and 2,7 isomers, 4,4′-dihydroxybenzophenone and 2,6-dihydroxyanthraquinone (anthraflavic acid); and (c) optionally bisphenol A in a maximum amount of 10 mole %; and processing the reaction mixture in a melt transesterification reaction to form a liquid crystal polycarbonate. While the product composition has the same overall characteristics as compositions made using diphenyl carbonate as the donor moiety for the carbonate linkage, they are analytically distinguishable because of limited incorporation of intermediate or end-cap residues derived from the activated diaryl carbonate.

The invention discloses a zinc catalyst applicable to controllable depolymerization of a polyester material and a catalytic method thereof, and belongs to the technical field of polyester depolymerization. The problems that an existing zinc catalyst used for alcoholysis of waste polyester materials needs to synthesize complex ligands, and the number of synthesis steps is increased are solved. Thecatalyst adopted by the invention is a bis(hexaalkyldisilazane)zinc catalyst with a simple structure, and under the participation of an alcohol compound, the polyester material can be depolymerized into small organic molecules under mild conditions through the transesterification reaction catalyzed by the catalyst, so that the reutilization of waste polyester is realized. The zinc catalyst is adopted to catalyze polyester depolymerization, metal zinc is non-toxic, colorless, cheap and easy to obtain and serves as one of the microelements of a human body, biocompatibility is good, and the production process is more environmentally friendly; the catalyst is simple in structure, few in synthesis steps and more economical in production cost. The catalyst has very good universality, and has a very good depolymerization effect on various polyester materials with different structures.