AMOCO CORP

These solvents include tetrahydrofuran (THF), 1,4-dioxane, chloroform, dichioromethane, and chloroben2ene. The relatively broad solubiHty characteristics of PSF have been key in the development of solution-based hoUow-fiber spinning processes in the manufacture of polysulfone asymmetric membranes (see Hollow-fibermembranes). The solvent Hst for PES and PPSF is short because of the propensity of these polymers to undergo solvent-induced crysta11i2ation in many solvents. When the PES stmcture contains a small proportion of a second bisphenol comonomer, as in the case of RADEL A (Amoco Corp.) polyethersulfone, solution stabiHtyis much improved over that of PES homopolymer. 

U.S. producers of benzene from petroleum and their approximate production capacities are shown in Table 5. These figures are inexact because the size of the market and instabiUty of benzene prices causes frequent changes in capacity. Dow Chemical, with total armual benzene capacity of 8.3 x 10 t (250 million gallons) is the largest producer in the United States. Other companies with total domestic capacity of over 3.3 x 10 t (100 million gallons) per year are Amoco Corp., Lyondell, British Petroleum America, Chevron, Exxon Chemical, Occidental Petroleum, Shell Oil, and Mobil. These companies account for approximately 60% of total U.S. benzene capacity (65). 

Union Carbide introduced the first commercial polyarylsulfone resin, Udel, in 1966 and later introduced Radel polyarylsulfone. The business and patents rights were acquired by Amoco Corp. in 1986. Other polysulfone products have been marketed by BASF and ICl (Victrex PES) the latter aimounced in 1991 it was withdrawing from the business. 

Davos, 15th-19th May 1995, paper 18. 8(13) CHEMICAL RECYCLING DILEMMA Caruthers W C Amoco Corp. 

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