Slurry catalyst

Distillation trays constiircted of porous catalyticaUy active material and reinforcing resins Method described for removing or replacing catalyst on trays as a hquid slurry Catalyst bed placed in downcomer, designed to prevent vapor None specified Wang et al., Chinese Patent 1,060,228 (1992) Jones, U.S. Patent, 5,1.3.3,942 (1992)... 

The most common heterogeneous catalytic reaction is hydrogenation. Most laboratory hydrogenations are done on liquid or solid substrates and usually in solution with a slurried catalyst. Therefore the most common batch reactor is a stirred vessel, usually a stirred autoclave (see Figure 2.1.1 for a typical example). In this system a gaseous compound, like hydrogen, must react at elevated pressure to accelerate the process. 

Products Company and Davison (W.R. Grace) Catalysts) and Hydrocarbon Technologies, Inc. ART provides non-zeolitic catalysts for ebullating residue hydrocracking and fixed bed pretreating HDT [140], A nanoscale iron based, slurry catalyst is recommended for coal liquefaction, while a molecule-sized and chemically in situ generated catalyst is employed for the high conversion of asphaltenic fractions or heavy oils [141],... 

Zhan, X., Arcuri, K., Huang, R., Agee, K., Engman, J., and Robota, H. J. 2004. Regeneration of cobalt-based slurry catalysts for Fischer-Tropsch synthesis. Prep. Pap.-Am. Chem. Soc. Div. Pet. Chem. 49 179-81. 

Oleic acid was hydrogenated at 25-17 C with mild agitation in the presence of a slurried catalyst with 5.3 wt7. platinum. These data were obtained,... 

A reaction, A + B = Products, is conducted in a CSTR with a slurried catalyst. The overall rate of reaction is believed to be controlled by the rates of adsorption of A and of the surface reaction between A and B. Given the tabulated data, find the rate equation. The starting condition in every case was Ca0 = 2 and Cb0 4. 

A two stage CSTR with slurried catalyst conducts a reaction with rate equation... 

A reaction in a slurried catalyst CSTR has the rate equation... 

A batch reaction is carried out with a slurried catalyst that, deactivates gradually. The rate equation is... 

The methyl esters can be fed directly to a hydrogenation unit, or more often are distilled to separate unreacted triglycerides which are recycled. The distilled methyl esters are hydrogenated at approximately 300°C and 3000 psig with a copper chromite catalyst in slurry form through tubular reactors. Excess hydrogen is used for reduction as well as agitation of the slurried catalyst. 

Hydrogenation reactions may be carried out in bubble column reactors. Often a slurry catalyst may be used which makes it a multiphase reactor. 

The most advanced two-stage process involves close coupled operation with a disposable slurry catalyst (typically iron and/or molybdenum) added with the feed coal and an integrated hydrotreater to treat the distillate condensed from the gaseous phase from the... 

Description A wide range of polyethylenes is made in a gas-phase, fluidized-bed reactor using proprietary solid and slurry catalysts. The product is in a dry, free-flowing granular form substantially free of fines as it leaves the reactor and is converted to pellet form for sale. Melt index and molecular weight distribution are controlled by... 

Batch reactors are not common in experimental catalysis since flow systems are so simple. They are most often found with liquid phase reactors using slurried catalysts. Good mixing is essential and checks should be made to eliminate external diffusion problems. Also it is necessary to vary catalyst loading during the experiment as a means of detecting vapor-liquid interfacial effects. ... 

In fine chemicals industries the batch reactor is used almost exclusively. For catalytic hydrogenations the batch reactor has a number of inconveniences in case a slurry catalyst is used. The complicated cooling coils, dead spaces behind baffles, etc. are difficult to clean if the catalyst has to be removed from the vessel. After each batch the vessel has to be emptied, which also implies that the catalyst falls dry. It is known that specially in this period all reactants and products, still contained in the pores of the catalyst, rapidly may deteriorate via unwanted side reactions and so deactivate the catalyst. Usually deactivation starts as soon as the catalyst is no more protected by the solvent. As a production series of one product consists of a number of batches, the exposure of the catalyst to deactivation conditions is frequent. 

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