31
Clifford R Stine, Bruce E Klipec, William J Herbert: Electric conductor adapted for use in process instrumentation. Samuel Moore & Company, Stevens Davis Miller & Mosher, August 9, 1977: US04041237 (47 worldwide citation)

An electrically insulated conductor adapted to be used at high temperatures in power plants, refineries and chemical process plants for connecting instruments has at least one pair of electrical conductors insulated with an irradiation cured ethylene-tetrafluoroethylene copolymer, ethylene-chlorotri ...


32
Sami A I Barri: Chemical process and catalyst. The British Petroleum Company, Morgan & Finnegan, May 12, 1987: US04665267 (46 worldwide citation)

Alkanes are dehydrogenated to alkenes, for example n-butane to n-butenes by contact with a catalyst comprising a silicalite and a platinum group metal the catalyst being substantially free of alkali and alkaline earth metals. The selectivity of the product to butenes is improved by either presulphid ...


33
Michael F McDonald, Robert L Long, Carl J Thomas: On-line control of a chemical process plant. Exxon Chemical Patents, Douglas J Collins, Andrew B Griffis, June 6, 2000: US06072576 (46 worldwide citation)

A process plant for the manufacture of halobutyl rubber is provided with online monitoring and control of the process parameters to control the properties of the product. It incorporates an in-situ measurement system that does not require the removal of any sample material from the process. It uses ...


34
Luke D Hinkle, D Jeffrey Lischer: System for delivering a substantially constant vapor flow to a chemical process reactor. MKS Instruments, Lappin & Kusmer, October 12, 1999: US05966499 (45 worldwide citation)

A vapor delivery system for delivering a vapor-phase reactant to a chemical process reactor at a substantially constant flow rate. The vapor delivery system includes a source of a reactant material, means for converting the reactant material to a vapor and for maintaining a predetermined volume of v ...


35
P Henrik Wallman: Minimum time, optimizing and stabilizing multivariable control method and system using a constraint associated control code. Chevron Research Company, S R LaPaglia, E J Keeling, H D Messner, April 5, 1988: US04736316 (44 worldwide citation)

In accordance with the present invention, a constraint dependent control method and system for a large scale refinery, chemical process or the like, is provided that allows on-line optimization of one and preferably two plant inputs without need for optimal set points, through iterative generation o ...


36
Kenneth R Graziani, Ajit V Sapre: Conversion of methanol to olefins using large size catalyst particles. Mobil Oil Corporation, Alexander J McKillop, Michael G Gilman, Dennis P Santini, October 29, 1985: US04550217 (43 worldwide citation)

The present invention describes a methanol-to-chemical process for converting methanol to olefins using large catalyst particles. The large catalyst particles result in significant improvements in catalyst activity and reactor stability.


37
Thomas C Hanson, Dante P Bonaquist, Michael D Jordan: Chemical process optimization method. Praxair Technology, Cornelius F O Brien, May 24, 1994: US05315521 (43 worldwide citation)

A method for producing two or more products from a production site such as an air separation plant to satisfy a given demand for each of the products in which energy consumption and the rate of product production are correlated so that product production may be determined from a conventional mixed i ...


38
Norman A Nelson: Inter-phenylene CBA compounds. The Upjohn Company, L Ruth Hattan, Robert A Armitage, December 15, 1981: US04306076 (43 worldwide citation)

The present specification provides novel analogs of carbacyclin (CBA.sub.2), 6a-carba-prostacyclin (6a-carba-PGI.sub.2), which have pronounced prostacyclin-like pharmacological activity, e.g., as platelet anti-aggregatory agents. Specifically the novel chemical analogs of CBA.sub.2 are those substit ...


39
James L Filson, Wesley R Carrera, Ramesh R Bhave: Ultra pure water filtration. Illinois Water Treatment, Douglas G Glantz, May 21, 1996: US05518624 (41 worldwide citation)

Ceramic filtration of a feed solution of ultra pure water and particle contaminants is disclosed through a metal oxide membrane on ceramic support. In one aspect, the filtering of ultra pure water from a feed solution containing ultra pure water and contaminant particles includes passing the feed so ...


40
Ian Swift, Hans K Fauske: Micro-scale chemical process simulation methods and apparatus useful for design of full scale processes, emergency relief systems and associated equipment. Fike Corporation, Schmidt Johnson Hovey & Williams, June 2, 1987: US04670404 (41 worldwide citation)

Micro-scale chemical process simulation apparatus is disclosed which is useful for design of full-scale processes and associated equipment as well as emergency relief systems. A thin-walled vessel for receiving a quantity of the material to be evaluated is supportd within and thermally insulated fro ...