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294results about How to "Avoid darkening" patented technology

Preparation technique of isosorbide

The invention relates to a preparation technique of isosorbide, belonging to the technical field of pharmacy. In the preparation technique, solid sorbitol is used as the raw material, a mixture of perfluoro-sulfonic acid resin and palladium on carbon is used as the catalyst, and hydrogen is used as an anti-carbonation agent to prepare the non-carbonized light-colored isosorbide reaction liquid; and low-temperature concentration and solvent crystallization are utilized to substitute the original high-temperature distillation. The preparation technique comprises the following steps: dehydration reaction, neutralization decolorization, electrodialysis desalination, water removal by concentration, extraction crystallization, freeze-drying, and quality inspection and packaging (after the product is qualified in inspection, packaging, and warehousing as the finished product). The invention can prevent carbonization and prevent the reaction liquid from becoming dark, thereby enhancing the utilization ratio of the raw material; most calcium salts are precipitated due to low solubility, and the electric conductivity of the reaction liquid is low, thereby being beneficial to subsequent extraction; and the invention overcomes the defect of high energy consumption in the high-temperature distillation technique, and the quality of the prepared isosorbide is more excellent.
Owner:SHANDONG FUTASTE

Processing technology of immature tangerine Pu'er tea

InactiveCN108077482APrevent oil volatilizationGreat tastePre-extraction tea treatmentAlpinia roxburghiiAir drying
The invention discloses a processing technology of immature tangerine Pu'er tea. The processing technology comprises the following steps: taking palace-grade Pu'er tea processed from a special-grade spring tea raw material of old trees in mountains 1500 meters or higher in elevation, and immature tangerines with large oil sacs, full oil cavities and uniform size from 8 year-old or older old treesin Xinhui first-grade producing areas, as raw materials; and selecting the Pu'er tea, selecting the immature tangerines, performing primary cleaning on the immature tangerines, digging out the pulp ofthe immature tangerines, performing secondary cleaning and dewatering on the immature tangerines, performing fixation on the immature tangerines, performing primary drying, filling the immature tangerines with the tea, and performing secondary drying, air drying, packaging and storing to obtain the immature tangerine Pu'er tea. In comparison to traditional technologies, the processing technologyof the immature tangerine Pu'er tea avoids bad mouthfeel and easy damping of the tea due to dampness in the immature tangerines, solves the problem of nutrient loss of the tangerine peel due to rapidhigh-temperature drying, improves the nutritional value of a product and has better popularization prospects.
Owner:江门市新会陈益号陈皮茶业有限公司

Furan dicarboxylic acid copolyester and preparation method thereof

The invention relates to furan dicarboxylic acid copolyester and a preparation method thereof. The preparation method comprises the following steps: mixing a first component, a second component and athird component with the mole ratio of 1 to (1.1 to 2.0) to (0.0001 to 0.02) with an esterification catalyst to obtain a first intermediate product, wherein the first component comprises at least oneof furan dicarboxylic acid and a furan dicarboxylic acid ester compound, the second component comprises at least one of aromatic diol and aliphatic diol, and the third component comprises polyhydric alcohol with hydroxyl number being greater than or equal to 3; performing prepolymerization reaction and polycondensation on the first intermediate product to obtain the furan dicarboxylic acid copolyester. In the preparation method, the polyhydric alcohol with hydroxyl number being greater than or equal to 3 serves as a connection point of chain segments, so that the chain segment structure of thefuran dicarboxylic acid copolyester is expanded to a network structure, thereby obtaining the colorless or lightcolor furan dicarboxylic acid copolyester with excellent mechanical property and air barrier property and high molecular weight.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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