40 results about "2-Octanol" patented technology

The invention relates to the production of 2-octylacrylate of high purity and in good yield using ethyl titanate in solution in 2-octanol or 2-octyl titanate as a transesterification catalyst.

The invention relates to a method and a device for preparing lincomycin hydrochloride. On the basis of the prior lincomycin hydrochloride production, repurifying processing procedure is added to prepare lincomycin hydrochloride with lincomycin B component less than or equal to 0.1 percent. The method is characterized by comprising the following steps: lincomycin hydrochloride with B component less than or equal to 1.0 percent is dissolved to have thetconcentration of 80000-100000 microgramme / ml, the pH value is adjusted to 10-11, extraction is carried out in extraction tower with 1 / 2-1 / 3 (weight ratio) of 2-octanol, the extraction temperature is 20-30 DEG C, the pH value of extraction liquid is adjusted to 2-4 by hydrochloric acid for back extraction, and acetone is used for crystallization. By adopting the method and the extraction tower device, the concentration of B component in lincomycin hydrochloride can be effectively reduced to be less than or equal to 0.1 percent, so that thequality of lincomycin hydrochloride is improved, and the yield is increased by 5-7 percent.

The invention relates to a process for continuously producing 2-octyl acrylate by reacting acrylic acid and 2-octanol in the presence of a sulfonic acid esterification catalyst and at least one polymerization inhibitor. The water formed by the esterification reaction is entrained by distillation in a column surmounting the reactor in the form of a heteroazeotropic mixture with the 2-octanol which is then subjected, after condensation, to separation in a decanter so as to give an upper organic phase and a lower aqueous phase. The reaction mixture containing the reaction product and residual by-products are purified by separation means in order to obtain: (1) pure 2-octyl acrylate and (2) unreacted 2-octanol and acrylic acid compounds that will be recycled along with the catalyst.

The invention relates to a processing for recovering low-grade molybdenum oxide concentrate through a wet process, belonging to the technical field of metallurgy. The process comprises the following steps: 1) grinding molybdenum rough concentrate, then adding sodium carbonate for leaching sodium hydroxide medicament, and carrying out solid-liquid separation on the concentrate slurry after leaching to obtain a sodium molybdate solution and leached slag; 2) carrying out flotation on the leached slag to prepare molybdenum concentrate; and 3) preparing ammonium molybdate by utilizing the solution of sodium molybdate: adding acid into the sodium molybdate solution to regulate the pH value to be 5-7, heating to 65-70 DEG C, filtering for removing silicon, extracting the filtered solution with the mixed solvent of N235, 2-octanol and kerosene, taking organic phases, adding ammonia water for back extraction to obtain an ammonium molybdate solution, and carrying out acid precipitation on the ammonium molybdate solution to obtain ammonium molybdate products. The scheme realizes the purpose of preparing two types of products by using one process and is used for processing the molybdenum oxide rough concentrate of which the molybdenum oxidation rate is 50-90% and the molybdenum grade is 5-35% to obtain the ammonium molybdate products of which the purity is greater than 56% and the molybdenum concentrate of which the grade is greater than 40%, and the recovery rate of molybdenum in the whole process is 80-96%.

The invention discloses a preparation method of di-methyl-heptyl methyl phosphonate. The method comprises the steps of (1) adding diphenyl methyl phosphonate and 2-octanol to a reactor according to the molar ratio of 1:(2 to 2.5), then adding catalysts to the reactor, and uniformly stirring, so that reaction liquid is obtained; (2) leading inert gas to the reactor, vacuumizing after the reactor is filled with the inert gas, heating the reaction liquid to 50 DEG C to 200 DEG C for reaction for 4 h to 6 h at the same time, and continuously vacuumizing during reaction so as to remove phenol which is generated during reaction; (3) cooling products to room temperature after the reaction is finished, then washing with water to be neutral, then reducing pressure and distilling, so that the di-methyl-heptyl methyl phosphonate is obtained. The preparation method has the advantages of simple synthetic route, mild reaction conditions, short reaction time, less side reaction, high reaction yield and no discharge of etchant gas and is suitable for industrial production.

The invention discloses a method for preparing optically pure (S)-2-octanol by a microbial method and a special microorganism thereof, which belong to the technical field of separating racemic compounds by a biological method. The present invention screens and obtains Pseudomonas maltophilia SYB-4 CCTCC M204042. Utilize this bacterial strain after cultivating, the preparation of whole cell, carry out the catalytic conversion reaction of microbial cell with racemic 2-octanol as substrate, asymmetric conversion racemic 2-octanol obtains product (S)-2-octanol, The optical purity of the product reaches above 80% e.e. The present invention determines the reaction system and reaction conditions for the asymmetric transformation of racemic 2-octanol in the whole cell of the strain, and the optical purity of the product is improved; the present invention also helps to understand the biological diversity of racemic compound resolution , which is of great significance for the development of special enzyme sources for resolution and the research of resolution methods in the future.