摘要:
Provided is a method for preparing a Y type molecular sieve having a high silica-to-alumina ratio, comprising: mixing deionized water, a silicon source, an aluminum source, an alkali source, and a tetraalkylammoniumcation source as a template agent to obtain an initial gel mixture; after aging the initial gel mixture at an appropriate temperature, feeding the gel mixture into a high pressure synthesis kettle for crystallization; separating a solid product, and drying to obtain the Y type molecular sieve having a high silica-to-alumina ratio. The method provides a phase-pure Y type molecular sieve having a high crystallinity, the SiO 2 /Al 2 O 3 thereof being not less than 6.
摘要:
The present invention relates to a method for preparing a NaY molecular sieve having a high silica-to-alumina ratio, wherein deionized water, a silicon source, an aluminum source, an alkali source, and ILs as a template agent are mixed to obtain an initial gel mixture; the initial gel mixture is maintained at a proper temperature and aged, then fed into a high pressure synthesis kettle for crystallization; the solid product is separated and dried, to obtain the NaY molecular sieve having a high silica-to-alumina ratio, wherein the ILs is a short-chain alkylimidazolium ionic liquid. The template agent used in the method of the invention is less volatile, and the resultant high-silicon Y molecular sieve has a high crystallinity and a silica-to-alumina ratio of 6 or more.
摘要:
The present application discloses a method for preparing polyester polyol comprising performing transesterification of raw materials containing inorganic oxyacid ester and polyhydric alcohol to obtain the polyester polyol. The polyester polyol obtained by the method described in the present application has higher heat resistance.
摘要:
The present application discloses a method for preparing a hierarchical porous TS-1 molecular sieve, which uses a silicon-titanium ester polymer as both titanium source and silicon source. In the method, silicon and titanium are uniformly connected to a same polymer, and the hydrolysis rates thereof are equivalent during hydrolysis, which can prevent TiO 2 precipitation and reduce the generation of non-framework titanium. Further, the silicon-titanium ester polymer is not only used as both silicon source and titanium source, but also can be used as mesoporous template in the synthesis process. The obtained TS-1 molecular sieve has mesoporous structure with narrow pore size distribution, which plays an important role in promoting the application of TS-1 molecular sieve in the field of catalysis.
摘要:
This application discloses a polymer ultraviolet absorbent and preparation method and application thereof. The synthesis process of the polymer ultraviolet absorbent does not require additional organic solvents, and the reaction by-product is high-purity ethanol, which is relatively economical. green, efficient and environmentally friendly. The polymer ultraviolet absorbent has good water solubility, is convenient to use, safe and non-toxic, and has excellent ultraviolet absorption effect.
摘要:
The present application discloses a catalyst for pyrolysis of 1,2-dichloroethane (1,2-DCE) to prepare vinyl chloride monomer (VCM), a preparation method, a use, and a regeneration method thereof. The catalyst for pyrolysis of 1,2-DCE to prepare VCM includes a silicon-aluminum molecular sieve. The catalyst for pyrolysis of 1,2-DCE to prepare VCM has high reaction activity and excellent selectivity and solves the problem that the pyrolysis of 1,2-DCE to prepare VCM in the prior art involves high reaction temperature and large energy consumption and is prone to coking and carbon deposition.
摘要:
The present application discloses a method for preparing a hierarchical porous TS-1 molecular sieve comprising using a silicon-titanium ester polymer as both titanium source and silicon source. In the method, silicon and titanium are uniformly connected to a same polymer, and the hydrolysis rates thereof are equivalent during hydrolysis, which can prevent TiO 2 precipitation and reduce the generation of non-framework titanium. Further, the silicon-titanium ester polymer is not only used as both silicon source and titanium source, but also can be used as a mesoporous template in the synthesis process. The obtained TS-1 molecular sieve has mesoporous structure with narrow pore size distribution.
摘要:
The present application discloses a method for preparing hierarchical porous titanium-silicon TS-1 molecular sieve, wherein a titanate polyester polyol is used as titanium source. In the method, titanium is connected to a polymer, which makes titanium more difficult to hydrolyze, prevent the TiO 2 precipitation and reduce the formation of non-framework titanium. In addition that such new type of the titanate polyester polyol acts as the titanium source during the synthesis process, the titanate polyester polyol can also be used as mesoporous template. Therefore, the TS-1 molecular sieve obtained by this method has mesoporous structure, which plays an important role in promoting the application of TS-1 molecular sieve in the field of catalysis.
摘要:
Disclosed is a process for converting naphtha. Lower olefin, light aromatic hydrocarbon, and gasoline with high octane number are produced through combining catalytic cracking of naphta with steam cracking of lower alkane and catalytic cracking of higher alkane and higher olefin. The process increases the yield of product with high value an decreases the yield of product with low value significantly. At the same time, the power consumption is decreased as whole since most reactants are converted in catalytic cracking at lower temperature