124results about How to "Synthesis conditions are easy to control" patented technology

The invention provides a method for preparing 3,4,5-trimethoxy-3'-hydroxy-4'-alkoxy diphenylethane. The method comprises the steps of firstly enabling 3-benzyloxy-4-hydroxybenzaldehyde and alkyl bromide to be subjected to alkoxylation reaction, so as to obtain a compound (2) shown in a drawing, then, enabling 3,4,5-trimethoxybenzyl triphenyl phosphine bromate and the compound (2) to be subjected to Wittig reaction, so as to prepare a compound (4) shown in a drawing, and finally, carrying out reduction on the compound (4) by palladium on carbon / hydrogen gas at normal pressure, thereby obtaining the target compound 3,4,5-trimethoxy-3'-hydroxy-4'-alkoxy diphenylethane. According to the method, the synthesis method is simple and reasonable, the operation is simple and convenient, the yield is high, the cost is low, the use of high-toxicity solvents, such as benzene, is avoided, the method is environmental-friendly, and the industrial production is facilitated.

The invention relates to a cordierite matrix catalyst used for preparing synthesis gas by reforming methane and carbon dioxide and a preparation method thereof. In the method, cellular cordierite is taken as the matrix of the catalyst, and the mixture of metallic oxide sosoloid NixMg(1-x)Al2O4 and CoxMg(1-x)Al2O4 is taken as active components and a carrier. The preparation method comprises the following steps of: processing the cellular cordierite in a salpeter solution, then washing and drying to obtain a cordierite matrix; preparing the cobalt nitrate, nickel nitrate, magnesium nitrate and aluminium nitrate into a solution according to the different contents of the catalyst, dropwise adding ammonia, and stirring to form a precipitation solution; and finally placing the cordierite and precipitation solution together into an autoclave and then placing the autoclave in a muffle furnace, then carrying out crystallization, drying and roasting to obtain the cordierite matrix catalyst. In the invention, an in-situ synthesis method is used, and the preparation process is simple; the prepared catalyst has a coating layer which is firmly combined with the matrix, and is applied to carbonyl synthesis; and in the synthesis chemical process of F-T, the catalyst has low bed pressure and good thermostability and the active component Ni is dispersed highly and has small possibility of sintering.