37results about How to "Not easy to coalesce" patented technology

The invention discloses a hydrophobic modification method for a Y-shaped molecular sieve. The method comprises the following steps: A, uniformly paving and dispersing the Y-shaped molecular sieve in silica wool, then placing the silica wool in a reaction furnace, wherein the Y-shaped molecular sieve is processed through baking for 2 hours at a temperature of 400-550 DEG C; B, introducing mixed gas comprising N2 and SiCl4 gas to the Y-shaped molecular sieve in the step A to carry out a reaction, wherein the reaction temperature is 300-600 DEG C, the reaction time is 30-180 minutes; C, taking the molecular sieve product from the step B, then washing the product through deionized water until no Cl<-> exists in the filtrate, and then washing the product through an acid; D, drying the resulting product from the step C, continuously packing the product through the silica wool, then placing the silica wool into the reaction furnace to carry out the reaction with water vapor having the temperature of 600-900 DEG C, wherein the reaction time is 2-12 hours. The hydrophobic modification method provided by the present invention has the following advantages that: the method is a convenient gasphase dealuminzation and silicon reinsertion method; with the method, the prepared molecular sieve has uniform silica alumina ratio, the solid particles are not easy to be aggregated to form the blocks.

The invention discloses a nano solid super-strong alkali catalyst. The nano solid super-strong alkali catalyst comprises 50 to 80 molar percent of magnesium oxide and 20 to 50 molar percent of tin oxide, and has a cubic crystal form, and the side length of the cube is 60 to 150nm. The invention also provides a preparation method of the nano solid super-strong alkali catalyst and application of the nano solid super-strong alkali catalyst in catalysis. The nano solid super-strong alkali catalyst has simple components and high catalytic activity, is easy and convenient to prepare, is present in a small amount, does not corrode a reactor and ensures mild reaction conditions when applied to the catalysis of one-pot condensation reaction, belongs to an environment-friendly catalyst, and can be used for multiple times through centrifugal separation after the reaction is finished.