Chinese Academy of Sciences

Shanxi Lu'an Mining (Group) Co., Ltd.

Mei Dong

Weibin Fan

Jianguo Wang

Dongfei Wang

Min Zhang

Yaning Xiao

Jiaqi Guo

Huaqing Zhu

Weilin Wang

Weiyong Jiao

Juncai Zhang

Shoujing Sun

Guofu Wang

Yunhong Li

Zhiwei Wu

Youliang Cen

Zhangfeng Qin

Yibo Zhang

Pengfei Wang

Dezhi Shi

Junyi Liu

Jinbo Li

Yanbin Cui

Junfen Li

Qiuming Zhou

Junten Li

A continuous slurry-bed tank reactor, comprising a tank reactor body, an agitator, and tubular separation membranes. A method of using the continuous slurry-bed tank reactor comprising adding a catalyst, feeding reactants, stopping feeding the reactants, starting a heating system, changing directions of the reactants flowing through the tubular separation membranes.

Continuous slurry-bed tank reactor and method of using same

The present invention provides a catalyst for aromatization of a long-carbon chain alkane and a preparation method thereof. In the present invention, a molecular sieve containing a BEA structure is taken as an active component and mixed with a carrier, and then the mixture is formed, dried and calcined to obtain the catalyst for aromatization of a long-carbon chain alkane. The active component is prepared by taking a Na&#x3b2; molecular sieve as a raw material and modifying through the following steps of: first obtaining an H&#x3b2; molecular sieve through ammonium ion-exchange, and then conducting dealumination and silicon insertion treatment of the H&#x3b2; molecular sieve through first hydrothermal treatment; forming a mesoporous structure in a molecular sieve framework through second hydrothermal treatment; reducing the acidity of the catalyst by potassium ion exchange, and finally using metal modification to improve the capability of the catalyst for catalyzing the aromatization of the long-carbon chain alkane and enhancing the toluene selectivity. The catalyst provided by the present invention shows high stability in the aromatization of the long-chain alkane and has a service life up to 170 h or above and aromatic hydrocarbon selectivity up to 80%, and the selectivity to toluene in aromatic hydrocarbon products can reach 85.5%.

Catalyst for aromatization of long-carbon chain alkane and preparation method and use thereof

An aromatization catalyst and preparation process and use thereof is set forth. The catalyst comprises an inorganic oxide and a modified Ga-ZSM-5 zeolite, which comprises a modified ZSM-5 zeolite with a hierarchical macro-meso-microporosity and gallium deposited in channels of and/or on surfaces of the modified ZSM-5 zeolite. The hierarchical porosity of the modified ZSM-5 zeolite in the catalyst can reduce diffusion resistance of products during the aromatization reaction, thereby retarding carbon depositing rate and substantially improving catalytic activity, aromatic hydrocarbon selectivity, stability and lifetime of the catalyst. When being used in aromatization of propane, the catalyst exhibits a high stability, a lifetime of more than 320 hours, and a selectivity to aromatic hydrocarbons of up to 73.3 wt. %.

Aromatization catalyst and preparation process and use thereof

The disclosure relates to a process for continuously producing polyoxymethylene dimethyl ethers at low temperature, pertains to the technical field of polyoxymethylene dimethyl ether preparation processes, and solves the technical problem of continuous production of polyoxymethylene dimethyl ether. A membrane separation element with precisely controlled pores in membrane is used to realize a direct separation of the feedstocks from the catalyst within the reactor, and effectively reduce the permeation resistance of the separation membrane tube. By oppositely switching the flowing direction of liquid reaction materials, the adhesion of the catalyst to the separation membrane tube is inhibited, and some particles stuck in separation membrane tube are removed, which ensures the continuous operation of the reaction process and allows a molecular sieve catalyst to exhibit its advantage of long catalytic life.

Process for continuously producing polyoxymethylene dimethyl ethers at low temperature

The present invention provides a method for preparing gasoline and aromatics by using Fischer-Tropsch synthesis exhaust. The method includes conducting an olefin conversion reaction on Fischer-Tropsch synthesis exhaust under the action of a first molecular sieve catalyst. A first refrigeration or cooling is conducted on an obtained product to obtain ultralow sulfur-containing gasoline and first-stage reaction gas. An alkaline aromatization reaction is conducted on the first-stage reaction gas under the action of a second molecular sieve catalyst. A second refrigeration or cooling is conducted on an obtained product to obtain aromatics. After the olefin conversion reaction, a gasoline component is separated and residual alkanes enter a second-stage fluidized bed reactor for the alkane aromatization reaction to produce aromatics. The present invention implements step conversion of different components in the Fischer-Tropsch exhaust, and has advantages of high reaction yield, easy catalyst regeneration and amplification, and the like.

Method and apparatus for preparing gasoline and aromatics by using Fischer-Tropsch synthesis exhaust

Growing community of inventors

Taiyuan, China

Mei Dong