5results about How to "Reduce separation energy consumption" patented technology

The present application relates to adsorption separation of bisphenol A and 2,4-bisphenol A adsorbent and its adsorption separation process; the adsorbent is a high-silicon Y molecular sieve containing rare earth, the molar ratio of the contained silicon oxide and aluminum oxide is 2.5:1-15:1, the contained rare earth metal is one or a combination of multiple of lanthanum, cerium, scandium and yttrium, the content of rare earth metal is 10:1-1000:1 in terms of the molar ratio of silicon and rare earth metal, and the rare earth metal exists in the form of metal ions. The adsorption separation process is to contact the mixture containing bisphenol A, 2,4-bisphenol A, triphenol and chroman in the crystallization mother liquor with the adsorbent in the adsorption separation reactor to carry out adsorption separation, and the obtained bisphenol A and 2,4-bisphenol A after adsorption separation enter the isomerization reaction unit; the obtained triphenol and chroman after adsorption separation enter the cracking reaction unit. Phenol is used as the eluent, has strong affinity with the adsorbent, and the elution efficiency reaches more than 95%.

This invention relates to the field of acyclic or carbocyclic compounds and discloses a method for preparing 6-bromo-2,3-difluorotrifluorotoluene, comprising: dissolving 2,3-difluorotrifluorotoluene in a mixed solvent composed of a polar modifier containing a proton acceptor site and a nonpolar solvent; adding a polyether stabilizer and an iron-based catalyst; and dropwise adding liquid bromine to trigger a directional bromination reaction. The method utilizes the protonated ion-pair complex formed by the in-situ generation of hydrogen bromide and the polar modifier, which, in conjunction with the polyether stabilizer, constructs a sterically hindered shielding structure at positions 4 and 5 of the substrate molecule. This invention forces the electrophilic substitution pathway to be directed towards position 6 of the substrate molecule, overcoming the bottleneck of extremely low positioning accuracy in passivated aromatic ring systems, transforming disordered isomers into a single dominant isomer, thereby reducing separation energy consumption.

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.

This invention discloses a method for preparing methyl ethyl carbonate and diethyl carbonate via transesterification under ambient temperature and pressure. Using dimethyl carbonate and ethyl acetate as raw materials, and sodium methoxide or sodium ethoxide as a catalyst, the raw materials are continuously added to a reaction vessel at 5-25℃ and 0.1MPa±0.02MPa. The stirring rate is 50-100 r / min, the temperature fluctuation is ≤±1℃, and the material residence time is 5-30 minutes, reaching reaction equilibrium when the dimethyl carbonate conversion rate fluctuation is ≤±0.5%. After the reaction, the generated Na₂CO₃, NaHCO₃, and CH₃COONa mixed solids are removed by vacuum filtration, pressure filtration, or centrifugation. The equilibrium liquid is sent to a continuous distillation column for separation and purification through multi-column distillation to obtain methyl ethyl carbonate and diethyl carbonate. Unreacted raw materials are recycled, and the byproduct methyl acetate is sold as a chemical product. This invention features mild reaction conditions, low equipment requirements, high reaction efficiency, low energy consumption, simple separation, no azeotropic interference, high resource utilization, and is suitable for continuous production.

The application relates to a carbon capture system for oxygen-enriched combustion based on molecular sieve adsorption separation, and relates to the field of efficient combustion and flue gas pollutant purification treatment. The carbon capture system for the existing power plant applying the oxygen-enriched combustion technology solves the problems of high oxygen enrichment energy consumption and complex system. The utility model is characterized in that air is cooled by a cold water heat exchanger, oxygen in the air is enriched by N-stage oxygen molecular sieve groups, the oxygen-enriched air is mixed uniformly in a mixing tank, the mixed air is subjected to oxygen-enriched combustion in a combustion system, flue gas is subjected to desulfurization and denitrification and water separation, and then the flue gas is subjected to pressurization and cooling to separate liquid carbon dioxide, so that the carbon dioxide in the flue gas is captured. The N-stage oxygen molecular sieve groups greatly reduce the oxygen separation energy consumption, and the concentration of the oxygen-enriched gas can be flexibly adjusted without setting a complex system, so that the utility model is suitable for different types of oxygen-enriched combustion power plants. The utility model is mainly used in the power plant applying the oxygen-enriched combustion technology.