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| Number | Title | Issue Date |
| 7253309 | Method for production of methacrylic acid This invention is related to a shell-and-tube type reactor provided with reaction tubes packed with a catalyst and adapted to circulate a heat medium to the fluid outside the tubes and is characterized by a method introducing a gas into the catalyst beds so as to re... | 08/07/2007 |
| 6699999 | Process for producing pyromellitic anhydride The present invention has for its object to provide a production method of a pyromellitic anhydride which is not only conducive to an increased catalyst life and, hence, an enhanced operating rate of a plant (reduced downtime) and a reduction in catalyst ... | 03/02/2004 |
