Celanese

Throughout the remainder of this article the term homopolymer refers to Delrin acetal resin manufactured and sold by Du Pont the term copolymer refers to Celcon acetal copolymer resins (registered trademark of Hoechst Celanese Corporation). 

Nominal MI, g/10 min Hoechst Celanese Celcon Du Pont Delrin BASF Ultraform... 

Supply and demand statistics for 1988 for all regions of the wodd as compiled by SRI International are given in Table 5. The wodd producers of acetal resins and their aimual capacities are Hsted in Table 6 (29). Hoechst Celanese and Ultraform Corporation (a joint venture of Degussa and BASF) have aimounced capacity expansions in the United States to 77,000 t and 16,000 t, respectively both were due in place in 1990. Part of general capacity expansion plans, aimounced by Du Pont for completion in 1991, are beHeved to apply to acetal resins. 

E.I. du Pont de Nemours Company, Inc. Hoechst Celanese Corporation Ultraform Company Mexico... 

A = Aristech Chemical B = BP Chemicals Ce = Celanese Cy = CYRO Industries Do = Dow Chemical Du = Du Pont E = Eastman Chemical G = General Electric R = Rohm Haas S = Shell Chemical U = Union Carbide... 

Patents claiming specific catalysts and processes for thek use in each of the two reactions have been assigned to Japan Catalytic (45,47—49), Sohio (50), Toyo Soda (51), Rohm and Haas (52), Sumitomo (53), BASF (54), Mitsubishi Petrochemical (56,57), Celanese (55), and others. The catalysts used for these reactions remain based on bismuth molybdate for the first stage and molybdenum vanadium oxides for the second stage, but improvements in minor component composition and catalyst preparation have resulted in yields that can reach the 85—90% range and lifetimes of several years under optimum conditions. Since plants operate under more productive conditions than those optimum for yield and life, the economically most attractive yields and productive lifetimes maybe somewhat lower. 

Ketene Process. The ketene process based on acetic acid or acetone as the raw material was developed by B. F. Goodrich (81) and Celanese (82). It is no longer used commercially because the intermediate P-propiolactone is suspected to be a carcinogen (83). In addition, it cannot compete with the improved propylene oxidation process (see Ketenes, ketene dimers, and related substances). 

Celanese Acjlates, Product Manual N-70-1, Celanese Chemical Co., New York. 

Celanese Mexicana, Celaya, Mexico 70 2-ethylhexanol acetaldehyde... 

The world s largest producers are Perstorp AB (Sweden, United States, Italy), Hoechst Celanese Corporation (United States, Canada), Degussa (Germany), and Hercules (United States) with estimated 1989 plant capacities of 65,000, 59,000, 30,000, and 22,000 t/yr, respectively. Worldwide capacity for pentaerythritol production was 316,000 t in 1989, about half of which was from the big four companies. Most of the remainder was produced in Asia (Japan, China, India, Korea, and Taiwan), Europe (Italy, Spain), or South America (Brazil, Chile). The estimated rate of production for 1989 was about 253,000 t or about 80% of nameplate capacity. 

Material Safety Data Sheet C41, Trimethjhlpropane, Elake Celanese Canada Inc., Montreal, 1990. 

Physical Properties Manual, Celanese Chemical Company, Dallas, Tex., 1981. 

Mcetate Tow Production and Characterisation, Filter Products Division, Technical Bulletin FPB-4, Hoechst Celanese Corp., Charlotte, N.C., 1989. 

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