30results about How to "High productivity per pass" patented technology

The invention discloses a preparation method of E-1-halo-3,3,3-trifluoropropene. In the presence of a block catalyst, in a tubular reactor, 1,1,1,3,3-pentachloropropane Gas-phase fluorination reaction with hydrogen fluoride to obtain the main product E-1-chloro-3,3,3-trifluoropropene and a small amount of product Z-1-chloro-3,3,3-trifluoropropene; further, in the block In the presence of a catalyst, E‑1‑chloro‑3,3,3‑trifluoropropene or / and Z‑1‑chloro‑3,3,3‑trifluoropropene reacts with hydrogen fluoride to generate gas phase fluorine in a tubular reactor chemical reaction to obtain the main product E-1,3,3,3-tetrafluoropropene. The single pass yield of the method of the invention is high; especially for the second step process, only the HCl in the first step product stream needs to be removed, and the remaining substances can be directly used for fluorination reaction after adding new HF. The block catalysts in the invention all have the characteristics of high activity and long service life.

The invention discloses a method for preparing propylene from n-butene. A raw material containing the n-butene is in contact with a cracking catalyst under a catalytic cracking reaction condition, wherein the reaction temperature is 450-550 DEG C, preferably 450-500 DEG C, the reaction total pressure (absolute pressure) is 0-0.5MPa, preferably 0-0.15MPa, the weight space velocity is 1-10h<-1>, preferably 2-4h<-1>; according to the cracking catalyst, the content of FER molecular sieve and modified ZSM-5 molecular sieve is no less than 50%, and the mass ratio of the FER molecular sieve to the modified ZSM-5 molecular sieve is (1 to 1) to (3 to 1); the modified ZSM-5 molecular sieve comprises the following components in percentage by weight: 4.5-6.0% of zirconium dioxide, 0.2-0.5% of iridium oxide, 0.15-0.45% of SO4<2->, and the remaining of ZSM-5 molecular sieve, and molar ratio of silicon to aluminum of the FER molecular sieve is 50-100. The method has the advantages of low reaction temperature and high single-pass propylene yield for use in the industrial process of producing the propylene from the raw material containing n-butene mixed C4.