10results about "Preparation by hydroxy group addition" patented technology

The present application relates to a kind of modified silicon-aluminum catalytic materials and its preparation method and application, which comprises: (1), the first electrically conductive object and the second electrically conductive object connected with the positive and negative of direct current power respectively are placed in aqueous solution containing silicon source and inorganic base, electrolysis is carried out under the voltage of 2-10V for 1-5 days, and mixed liquor is obtained;Wherein, the first electrically conductive object is graphite forming body;(2), the mixed liquor is mixed with silicon-aluminum catalytic material, then is transferred into heat-resistant closed container, and hydrothermal reaction is carried out under the condition of 100-250 DEG C, autogenous pressure for 12-36 hours, and solid product is collected and optionally calcined.The modified silicon-aluminum catalytic material prepared by the method of the present application has more optimal reaction activity, selectivity of target product and activity stability.

A method of preparing isopropyl alcohol (IPA), the method including the steps of (S1) preparing a crude isopropyl alcohol (IPA) product obtained by performing gas purification and isopropyl alcohol purification on a reaction product of propylene and water; (S2) feeding the crude IPA product to a first section of a dividing wall distillation column including the first section, a second section, a top section, and a bottom section; and (S3) in the dividing wall distillation column, separating water and low boiling point organic materials contained in the crude IPA product to the top section, separating high boiling point organic materials and inorganic materials contained in the crude IPA product to the bottom section, and obtaining purified isopropyl alcohol in a liquid phase or a vapor phase to the second region.

This invention discloses a highly efficient composite solubilizer for the hydration of butene to sec-butanol, belonging to the field of chemical process technology. Its composition includes: 0-60 parts of a polyether-based polymeric surfactant, 15-35 parts of a highly polar aprotic solvent, and 10-20 parts of a co-catalyst. The main solubilizing component of this invention disperses oily butene into extremely small droplets, allowing it to mix uniformly in water, thereby increasing the surface area for the reaction. The co-solvent, as the main component, provides a stable environment, ensuring that this highly mixed state is maintained for a certain period. The added additives, possessing both water and oil solubility, facilitate smoother dissolution of the mixture and help the reactants quickly contact the active sites of the catalyst. This accelerates the reaction rate of butene and water, significantly improving the efficiency of the one-time conversion to sec-butanol and greatly saving the large amount of energy required for material recycling.

Provided are a method for preparing isopropyl alcohol and an apparatus for the same. The method includes performing a gas phase reaction by supplying a feed stream including a propylene monomer and water to a reactor in the presence of a catalyst; partially condensing a reaction product of the gas phase reaction in a heat exchanger, transferring an uncondensed gas phase reaction product to an absorption column, and transferring a portion of the condensed liquid phase reaction product to a pH measurement system connected on-line between the heat exchanger and the absorption column; measuring a PH of the liquid phase reaction product to calculate a catalyst content, and supplementing an amount of a Catalyst corresponding to the calculated catalyst content to the reactor; and dissolving isopropyl alcohol included in the gas phase reaction product in absorbing water and separating the isopropyl alcohol in the absorption column.

This invention provides a nickel-based catalyst and its application, as well as a method for nickel-catalyzed asymmetric hydration of olefins, belonging to the field of organic synthesis technology. The nickel-based catalyst and method for nickel-catalyzed asymmetric hydration of olefins provided by this invention systematically study the asymmetric hydration reaction of inactive olefins catalyzed by nickel, overcoming the generally considered problem of uncontrollable chirality in classical hydration reactions. Furthermore, it achieves the conversion of various terminal inactive olefins into chiral alcohols, with a wide range of applicable olefin substrates, suitable for the synthesis of a series of dialkyl chiral alcohols with various functional groups.

This invention discloses an energy-saving and consumption-reducing process for the aqueous production of cyclohexanol, characterized by the following steps: 1) The oil phase product discharged from the reactor is first flash-evaporated; 2) The flash-evaporated vapor phase enters the cyclohexanol separation tower, and the liquid phase after flash evaporation enters the filtration equipment; 3) The filtered clear liquid enters the cyclohexanol separation tower, and the catalyst particles are discharged from the filtration equipment. The advantages of this invention are: eliminating the safety hazards caused by flash evaporation of the feed liquid in the cyclohexanol separation tower; reducing the flow rate entering the filtration equipment after flash evaporation, thus reducing the investment in the required filter equipment; and allowing for secondary liquid-liquid separation within the flash evaporation equipment, reducing the amount of water entering the cyclohexanol separation tower and lowering its energy consumption.

A method for preparing 1,2-propanediol involves reacting propene with hydrogen peroxide, in the presence of a phase transfer catalyst and a heteropolytungstate, in a liquid reaction mixture containing an aqueous phase with a maximum apparent pH of 6 and an organic phase containing a solvent having a solubility in water at 20° C. of less than 500 mg / kg. The method then involves separating the liquid reaction mixture into an aqueous phase containing 1,2-propanediol and an organic phase, recycling at least a part of the separated organic phase to the reaction, and extracting the separated aqueous phase with an extractant solution containing the same phase transfer catalyst and solvent as used in the reaction to provide an extracted aqueous phase and an extract phase. The method further involves recycling at least a part of the extract phase to the reaction and recovering 1,2-propanediol from the extracted aqueous phase.

The present disclosure relates to a kind of nanometer catalytic material and its preparation method and olefin hydration method, which comprises: S1, the first conductive object and the second conductive object are connected with the positive pole and the negative pole of direct current power supply respectively, then placed in electrolyte containing inorganic base, electrolysis 1-5 days under the voltage of 5-50V, to obtain the solution after electrolysis treatment;Wherein, the first conductive object is graphite forming body;S2, the electrolysis-treated solution, aluminum source, silicon source and cationic surfactant are mixed to obtain a first mixture;S3, the mixed solution is hydrothermally treated, and the obtained solid product is calcined.The nanometer catalytic material prepared by the method of the present disclosure is used for olefin, especially C 6+ In the hydration reaction of macromolecular olefin, the conversion rate of reactants is high, and the selectivity of target product is good.

This invention provides a method for improving the catalytic performance of ZSM-5 molecular sieves used in the hydration of cyclohexene to prepare cyclohexanol, belonging to the field of catalysis technology. This method employs a dissolution-recrystallization post-treatment technique to control the surface acidity and surface silica-alumina ratio of ZSM-5, allowing additional aluminum sources to enter the molecular sieve framework. This effectively controls the surface acidity and surface silica-alumina ratio of ZSM-5 molecular sieves, increases acidic sites, and enhances the catalyst activity in the hydration of cyclohexene to cyclohexanol. The molecular sieve prepared by this method exhibits advantages such as high cyclohexene conversion and good cyclohexanol selectivity in the catalytic reaction of cyclohexene hydration to cyclohexanol.

This invention provides a method for synthesizing (S)-Rhododendrol and its analogues, belonging to the field of organic synthesis technology. The method provided by this invention uses commercially available raw materials and achieves the synthesis of (S)-Rhododendrol in just three steps, also providing an efficient route for the synthesis of its analogues. The core advantage of this invention is the use of inexpensive nickel and chiral ligands as catalysts to convert olefins into chiral alcohols under oxygen conditions, making it an effective, green, and inexpensive method for synthesizing (S)-Rhododendrol and its analogues.