Texas Industries Inc

Texaco Chemical, See Texaco Inc. (US), 250 Texaco Inc., See ChevroiiTexaco Coip. (US), 250 Texas Depailnient of Agriculture, 298 Texas Industries hic., 250 Texas Instiarments hic., 250... 

PPG INDUSTRIES INC. MALLINCKRODT SPECIALTY CHEMICALS CO. OCCIDENTAL CHEMICAL CORP. NIAGARA PLANT DOW CHEMICAL CO. TEXAS OPERATIONS... 

Major companies producing 1,1-dichloroethane within the United States include PPG Industries, Inc., Continental Oil Company, and Vulcan Materials, all based in Louisiana, and Dow Chemical located in Texas. Each of these companies manufactures 1,1-dichloroethane primarily to be used as an intermediate in the manufacture of 1,1,1- trichloroethane. 

While production decreased over these years and while ammonia plants were closed, the states and companies producing ammonia remained relatively constant. In both 2000 and 2001, Louisiana, Oklahoma, and Texas were the three major producing states, contributing over 55% of the U.S. ammonia production. Six companies (Farmland Industries Inc., Terra Industries Inc., PCS Nitrogen Inc., Agrium... 

Epsilon Industrial Inc., 2215 Garnd Avenue, Parkway, Austin, Texas 78728 www.epsilon-gms.com... 

FIGURE 24-5 Typical bubble-cap tray (courtesy Smith Industries Inc., Houslon, Texas)... 

Smith Industries Inc., Equipment Manual, "Section E Dehydrators," Houston, Texas. 

SACHEM Inc. of Cleburne, Texas, manufactures various concentrations of tetramethylammo-nium hydroxide (TMAH) solutions to meet customer specifications. To ensure consistent performance, electronic industry requires very narrow concentration specifications for the solutions. In SACHEM s quality control laboratory, standardized acids such as HC1 or H2S04 are used as titrants for the TMAH solutions to check their concentrations. The performance of the assay titration is controlled by daily analysis of internal reference standards (IRSs). If the IRS results are within controlled limits, then the assay results of a product can be reported. If not, the results cannot be reported until the root cause is uncovered and eliminated. Safety glasses and gloves are worn while performing this work in the laboratory. 

SACHEM Inc., located in Cleburne, Texas, is a producer of high-purity bulk chemicals for companies that have high-purity requirements in their chemical processing. As stated in Workplace Scene 1.2, one of their products is tetramethylammonium hydroxide (TMAH), which is sold to semiconductor industries. The analysis of TMAH for trace anions such as chloride, nitrate, nitrite, and carbonate is critical for SACHEM s quality control laboratory. If these ions are present on the integrated circuit boards manufactured by one of their semiconductor customers, they may cause corrosion severe enough to affect the functionality and performance of the electronic devices in which the circuit boards are used. In SACHEM s quality control laboratory, ion chromatography procedures have been developed to measure the anion concentrations in TMAH. Because the concentration levels are trace levels, a clean room environment, like that described in Workplace Scene 1.2, is used. A special procedure for carbonate analysis is required so that the absorption of carbon dioxide from the atmosphere can be minimized. 

Zey, J.N. McCammon, C. (1990) Industrywide Studies Report of an Industrial Hygiene sun ey at Sterling Chemicals, Inc., Texas City Plant, Texas City, Texas (Report No. 84.20.10), Cincinnati, OH, National Institute for Occupational Safety and Health... 

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