Polyethylene Union Carbide Corporation

The solvent can be tailored to provide selective acid gas removal based on the Hquid—gas solubiHties. For example, the Selexol process, Hcensed by Union Carbide Corporation, uses the dimethyl ether of polyethylene glycol (DMPEG) to provide high hydrogen sulfide selectivity. The solubiHty of hydrogen sulfide in DMPEG is 8—10 times that of carbon dioxide. 

In 1958 the Union Carbide Corporation introduced high molecular weight, highly crystalline ethylene oxide polymers under the trade name Polyox. Although similar in appearance to polyethylene they are miscible with water in all proportions at room temperature. 

UNIPOL [Union Carbide Polymerization] A process for polymerizing ethylene to polyethylene, and propylene to polypropylene. It is a low-pressure, gas-phase, fluidized-bed process, in contrast to the Ziegler-Natta process, which is conducted in the liquid phase. The catalyst powder is continuously added to the bed and the granular product is continuously withdrawn. A co-monomer such as 1-butene is normally used. The polyethylene process was developed by F. J. Karol and his colleagues at Union Carbide Corporation the polypropylene process was developed jointly with the Shell Chemical Company. The development of the ethylene process started in the mid 1960s, the propylene process was first commercialized in 1983. It is currently used under license by 75 producers in 26 countries, in a total of 96 reactors with a combined capacity of over 12 million tonnes/y. It is now available through Univation, the joint licensing subsidiary of Union Carbide and Exxon Chemical. A supported metallocene catalyst is used today. 

The four polyethylene oxide samples were obtained from the Union Carbide Corporation, and were used in the powdered form in which they were received. Their molecular weights were obtained in the conventional manner and are respectively M = 3.2 x 10 ... 

Mr. Wellington E. Walker died suddenly on May 8, 1980. His death is a deep loss to his friends at Union Carbide Corporation. He was honest in his private and professional lives and never surrendered his principles he was a good friend always ready to help he worked every day honestly with excellence and dedication. He was an inventor of commercialized reactions for low pressure polyethylene, the synthesis of n-octanol and the rhodium catalyzed homogeneous conversion of C0 H2 into polyols. He was a coauthor of ca. forty-six patents and twenty-seven papers. 

Though Phillips catalysts are by far the most important supported chromium catalysts for polyethylene, there are other commercially important examples of such catalysts. These were developed primarily in the 1970s by the Union Carbide Corporation (6), now part of the Dow Chemical Company. UCC chromium catalysts for polyethylene will be discussed in section 5.4. 

Union Carbide Corporation ultrahigh molecular weight polyethylene ultralow density polyethylene... 

Union Carbide Corporation. Technical literature Carbowax polyethylene glycols, 1986. 

By recognizable name , only two of the early players in the polyolefin industry are listed ExxonMobil— formerly Exxon, previously Esso, previously Standard Oil (S.O.)—at the head of the list and Chevron Phillips, which was formed 1 July 2000 by merging the chemical operations of Phillips Petroleum Company and Chevron Corporation. Dow Chemical purchased Union Carbide Corporation for 9.3bn in 2001 and through that acquisition can claim to have been an early participant in this polyolefin industry (recalling that Union Carbide was rapidly developing ICI low-density polyethylene plants during WWH under sub-licence from DuPont). 

In order to better understand the importance of these new magne-sium/titanium-based Ziegler catalysts it is necessary to discuss several United States patents issued to Farbwerke Hoechst, Mitsubishi Chemical Industries, Montedison Industries, and Union Carbide Corporation. These patents were issued in the United States between 1972-1981 and provided the catalyst technology that led to the introduction of LLDPE and HOPE as important commercial products that created significant growth in the polyethylene industry. 

The polyethylene particle morphology (particle shape, size and density) is an important property for high-activity Ziegler catalysts used in the gas-phase, fluidized-bed process. As discussed previously in patent description IV, U.S. Patent 4,302,565 issued to Union Carbide Corporation on November 24, 1981, magnesium/titanium complexes discovered in the 1970s (patents described in II and III above) were impregnated into silica in order to provide a catalyst system that could be injected into the gas-phase process as a solid material. 

After the end of World War II, polyethylene production in the United States was limited to only Union Carbide Corporation and the DuPont Company which entered the business with the support of the United States government to provide an additional source of polyethylene in support of the war effort. In 1950, the annual production in the United States was 50 million poxmds and the product demand was growing extremely rapidly. During this time, polyethylene demand outpaced the supply. 

Notify pipeline system operators who have installed polyethylene gas piping extruded by Century Utility Products, Inc., from Union Carbide Corporation... 

Union Carbide Corporation, Chemiccils and Plastics Divisiwi, Gas-phase, hi density polyethylene process, Chejn. Eng., (1973) pp 72-73. 

Commercial production started at ICI in 1938, and in 1940 polyethylene production had reached 100 tons which were utilized in early wire and cable applications to build radar systems and other applications to support the war effort. One could argue that these first 100 tons of polyethylene may have been the most important polyethylene ever manufactured. Toward the end of the war, British annual production was about 1,500 tons. In 1943, the great military significance of polyethylene led both the Union Carbide and DuPont corporations to license the ICI process and begin the manufacture of polyethylene in the United States. 

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