Rohm Hass

More than a decade after the publication of the MoVNb catalyst system, scientists at Mitsubishi Chemical reported that modifying this family of mixed metal oxides with Te produced a catalyst for the amoxidation of propane to acrylonitrile [4] and the oxidation of propane to acrylic acid [5], Modification of the Union Carbide catalyst system with Te was probably not a random choice as it is a known propylene activator [5 b] and the molybdate phase TeMoO oxidizes propylene into acrolein and ammoxidizes propylene to acrylonitrile [6], a key intermediate in the commercial production of acrylic acid using Mo-based oxides. Significant efforts to optimize this and related mixed metal oxides continues for the production of both acrylic acid and acrylonitrile, with the main participants being Asahi, Rohm Hass, BASF, and BP. 

This invention has its roots in Reppe chemistry. In the late 1930s, Reppe in Germany had developed a number of manufacturing processes for bulk chemicals, where acetylene was used as one of the basic building blocks. Even today BASF and Rohm Hass manufacture large quantities of acrylic acid and its esters by hydrocarboxylation of acetylene. This reaction, 4.12, is catalyzed by a mixture of NiBr2 and Cul. It involves high pressure (100 bar) and temperature (220°C), and mechanistically is not fully understood. 

A set of thermal oxide wafers are polished using a silica-based slurry (Cabot SC-112) on an IPEC polisher equipped with an ICIOOO pad (Rohm Hass). The polishing time is set at 30 s with a slurry flow rate of 150ml/min and downpressure of 9 psi with 2 psi backpressure. The rotational speeds of the wafer and the pad are 25 rpm and 13rpm, respectively. After polishing, the wafers are dried and then taken to the clean room where the STEAG bench is located. 

J Sung and A C Alves, Rohm Hass, IX, USA 2005, Elsevier Ltd. All Rights Reserved. 

Impet (Hoechst, DE) Etar (Eastman Chem. Intern., US)Ropet (Rohm Hass Co., US)... 

Source Adapted from Acusol Detergent Polymers for Food Process Cleaner, Formulation FC-318, Rohm Hass Company, Philadelphia, PA, May 1995. 

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