11 results about "Diethyl succinate" patented technology

The invention discloses Leishan fish sauce sour essence as well as a preparation method and application thereof. The leishan fish sauce acid essence is prepared from ethyl acetate, absolute ethyl alcohol, ethyl isovalerate, ethyl hexanoate, isoamyl alcohol, furfuryl alcohol, ethyl lactate, ethyl caprylate, acetic acid, diethyl succinate, methyl salicylate, ethyl benzoate, ethyl laurate, hexanoic acid, phenethyl alcohol, 4-methyl guaiacol, ethyl myristate, ethyl palmitate, ethyl oleate, capsicum oleoresin, ethyl phenylacetate and ginger oil. And lactic acid, glycerol triacetate, ocimene, ethyl isovalerate, ethyl butyrate, anethole and phenylacetaldehyde. The Leishan fish sauce sour essence disclosed by the invention is soft and harmonious in overall fragrance, natural and vivid, still has stable flavor characteristics at high temperature, can make up the problem of flavor deficiency in sour soup products, realizes accurate reproduction and controllable release of composite fragrance, improves the standardization level of products, and effectively improves the preference degree of consumers.

To provide a beer-taste beverage in which a grassy taste is reduced and a light and brisk aftertaste is imparted, and a method for producing the same. In a beer-taste beverage, the problem of the present application can be solved if at least one of the following (A) to (C) is satisfied. (A) The containing concentration of ethyl 2-methylbutanoate is 15 ppb or more; (B) The containing concentration of ethyl 2-methylbutanoate is 45 ppb or more; (C) The containing concentration of diethyl succinate is 520 ppb or more.

To provide a collagen-containing composition and a method for producing the same, a collagen-containing composition for addition to foods and drinks, and a collagen odor masking agent and a masking method that enable effective masking of collagen odor.SOLUTION: A collagen-containing composition contains collagen, a steviol glycoside, α-glucosyl rutin, and diethyl succinate and / or diethyl malonate.SELECTED DRAWING: None

The invention belongs to the field of catalyst preparation, and relates to a rel-(2S, 3S)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester compound as well as a preparation method and application of the rel-(2S, 3S)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester compound. The compound has a structure as shown in a formula (I), is a pure raceme, has an impurity content of less than 0.1%, and has a nuclear magnetic hydrogen spectrogram basically consistent with a figure 5. The invention provides a pure rel-(2S, 3S)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester compound and a preparation method thereof, and completes the identification of the relative configuration of the rel-(2S, 3S)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester compound. The preparation method is suitable for industrial large-scale production of pure (2S, 3S)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester, and the pure (2S, 3S)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester is used as an internal electron donor for preparation of a Ziegler-Natta polypropylene catalyst.

This invention discloses a ternary composite extraction system for iron-containing brine with a high magnesium-to-lithium ratio and its application. The ternary composite extraction system includes: a main extractant, a co-extractant, a phase behavior modifier, and a diluent; wherein the main extractant includes diphenyl octyl phosphate, the co-extractant includes di(2-ethylhexyl)phosphoric acid, and the phase behavior modifier includes diethyl succinate. This invention proposes a ternary composite extraction system containing DPOP, P2O4, and DES, and establishes a differentiated extraction-back-extraction pathway for complex iron-containing systems. It enables effective lithium recovery through water back-extraction and controls the distribution behavior of iron in the system, thereby simplifying the process and improving the stability of the organic phase cycle.

The invention discloses a preparation method of a tigorazan intermediate. The method comprises the following steps: by taking 1-benzyl-2-methyl-1H-imidazole-5-formaldehyde as a starting material, carrying out Horner-Wadsworth-Emmons reaction on the starting material and O, O '-diethyl-(2-succinic acid diethyl ester) phosphonate to prepare (E)-2-[(1-benzyl-2-methyl-1H-imidazole-5-yl) methylene] succinic acid diethyl ester, and reacting the (E)-2-[(1-benzyl-2-methyl-1H-imidazole-5-yl) methylene] succinic acid diethyl ester with the O, O'-diethyl-(2-succinic acid diethyl ester) phosphonate to prepare (E)-2-[(1-benzyl-2-methyl-1H-imidazole-5-yl) methylene] succinic acid diethyl ester; and then hydrolyzing under an alkaline condition, and acidifying to obtain the tegorazan intermediate (E)-4-(1-benzyl-2-methyl-1H-imidazole-5-yl)-3-(ethoxycarbonyl) butyl-3-olefine acid. The invention provides a brand new preparation method, the yield is improved by more than 30% compared with a mainstream process, the materials used in the method are cheap and easily available, the step operation is simple and convenient, the reaction condition is mild and safe, the production cost can be greatly reduced, and the industrial production is favorably realized.

The object of the present invention is to provide a beer-flavored beverage with reduced grassiness and a light aftertaste, as well as a method for producing the same. [Solution] In a beer-flavored beverage, the problem of the present invention can be solved if at least one of the following conditions (A) to (C) is met. (A) The concentration of ethyl 2-methylbutyrate is 15 ppb or higher; (B) The concentration of ethyl isovalerate is 45 ppb or higher; (C) The concentration of diethyl succinate is 520 ppb or higher;

The present invention relates to a method for preparing (E)-4-(1-benzyl-2-methyl-1H-imidazol-5-yl)-3-(ethoxyacyl)but-3-enoic acid. The method comprises the following steps: S1, preparing 2-methylimidazole-4-carboxaldehyde by reacting 2-bromomalondialdehyde with acetamidine hydrochloride; S2, preparing 1-benzyl-2-methylimidazole-4-carboxaldehyde by reacting the 2-methylimidazole-4-carboxaldehyde with benzyl bromide; and S3, preparing (E)-4-(1-benzyl-2-methyl-1H-imidazol-5-yl)-3-(ethoxyacyl)but-3-enoic acid by reacting the 1-benzyl-2-methylimidazole-4-carboxaldehyde with diethyl succinate. The preparation method of the present invention prepares 2-methylimidazole-4-carboxaldehyde by reacting 2-bromomalondialdehyde with acetamidine hydrochloride. No strong acidic gas is generated, and the intermediate products in each step are relatively stable. The product yield is about 53% (calculated as 2-bromomalondialdehyde), which is more suitable for industrial production.

The invention relates to the technical field of microorganisms and fermentation engineering, and particularly discloses a Pichia kluyveri strain H421, and the preservation number of the Pichia kluyveri strain H421 is CGMCC (China General Microbiological Culture Collection Center) NO.34649. The bacterial strain H421, commercial saccharomyces cerevisiae D254 and schizosaccharomyces pombe CICC 32484 are sequentially inoculated and fermented, the aroma of the brewed lonicera caerulea fruit wine is dominated by isoamyl acetate and phenethyl acetate, the brewed lonicera caerulea fruit wine is rich in various esters such as ethyl caprylate, ethyl caprate and diethyl succinate, and the characteristic flower and fruit aroma is jointly formed. The strain H421 has excellent alcohol resistance, acid resistance and SO2 resistance, and can adapt to the fermentation environment of the lonicera caerulea fruit wine. By adopting a multi-strain sequential inoculation fermentation method including the strain, the content of malic acid in the lonicera caerulea fruit wine can be remarkably reduced, and the variety and content of aroma substances are greatly increased, so that the problems of strong acerbity and single aroma of the lonicera caerulea fruit wine are effectively improved.

The invention belongs to the field of catalyst preparation, and relates to a rel-(2S, 3R)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester compound as well as a preparation method and application of the rel-(2S, 3R)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester compound. The compound has a structure as shown in a formula (I), is a pure raceme, has an impurity content of less than 0.1%, and has a nuclear magnetic hydrogen spectrogram basically consistent with a figure 5. The invention provides a pure rel-(2S, 3R)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester compound and a preparation method thereof, and completes the identification of the relative configuration of the rel-(2S, 3R)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester compound. The preparation method is suitable for industrial large-scale production of pure (2S, 3R)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester, and the pure (2S, 3R)-2, 3-diisopropyl-2-cyanosuccinic acid diethyl ester is used as an internal electron donor for preparation of a Ziegler-Natta polypropylene catalyst.

The invention provides a propylene polymerization catalyst as well as a preparation method and application thereof, and relates to the technical field of olefin polymerization. The propylene polymerization catalyst comprises magnesium halide, a titanium compound, a composite internal electron donor and a composite external electron donor, the composite internal electron donor is a combination of 2, 3-diisopropyl succinic acid diethyl ester and 9, 9-bis (methoxymethyl) fluorene, or the composite internal electron donor is a combination of 2, 3-diisopropyl succinic acid diethyl ester and 9, 9-bis (methoxymethyl) fluorene, or the composite internal electron donor is a combination of 2, 3-diisopropyl succinic acid diethyl ester and 9, 9-bis (methoxymethyl) fluorene. The composite electron donor is a combination of 2, 3-diisopropyl diethyl succinate and diisobutyl phthalate, and the composite external electron donor is tert-butyl methyl dimethoxy silane and carbonic acid (2-ethyoxyl ethyl) ethyl ester. The prepared propylene polymerization catalyst is good in stability and high in catalytic efficiency, the isotacticity of polypropylene is high, and the propylene polymerization catalyst is applied to a Spheripol ring tube propylene polymerization process.