(12) United States Patent (10) Patent No.: US 7,323,598 B2 Hugo Et Al
USOO7323598B2 (12) United States Patent (10) Patent No.: US 7,323,598 B2 Hugo et al. (45) Date of Patent: *Jan. 29, 2008 (54) PREPARATION OF XYLYLENEDLAMINE (56) References Cited (XDA) U.S. PATENT DOCUMENTS (75) Inventors: Randolf Hugo, Dirmstein (DE); Sabine 2002fOO38054 A1 3/2002 Hurley et al. Jourdan, Mannheim (DE); Kirsten 2003, OO13917 A1 1/2003 Nakamura et al. Wenz, Mannheim (DE); Thomas Preiss, Weisenheim Am Sand (DE); FOREIGN PATENT DOCUMENTS Alexander Weck, Freinsheim (DE) DE 2041360 2, 1971 (73) Assignee: BASF Aktiengesellschaft, EP 1193244 4/2002 Ludwigshafen (DE) EP 1279661 1, 2003 GB 13064.49 2, 1973 (*) Notice: Subject to any disclaimer, the term of this WO WO-2005O28417 3, 2005 patent is extended or adjusted under 35 U.S.C. 154(b) by 48 days. Primary Examiner Samuel Barts (74) Attorney, Agent, or Firm—Connolly Bove Lodge & This patent is Subject to a terminal dis Huitz LLP claimer. (57) ABSTRACT (21) Appl. No.: 10/571,615 A process for preparing Xylylenediamine, comprising the (22) PCT Fed: Sep. 4, 2004 steps of (86) PCT No.: PCT/EP2004/OO9883 ammoxidizing Xylene to phthalonitrile by contacting the S 371 (c)(1), vaporous product of this ammoxidation stage directly with a (2), (4) Date: Mar. 10, 2006 liquid organic solvent (quench), (87) PCT Pub. No.: WO2OOS/O261O2 removing products having a boiling point higher than phtha lonitrile (high boilers) from the resulting quench Solution or PCT Pub. Date: Mar. 24, 2005 Suspension and (65) Prior Publication Data hydrogenating the phthalonitrile, US 2007/0O88178 A1 Apr. 19, 2007 wherein the organic solvent used for the quench is N-me thyl-2-pyrrolidone (NMP), after the removal of the high (30) Foreign Application Priority Data boilers and before the hydrogenation, there is a partial or Sep.
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