OCCIDENTAL <OXY> UNIT SELLS DIVISION Occidental Petroleum Corp's Occidental Chemcial Corp said it sold the Process chemicals division it acquired as part of the September 1986 purchase of Diamond Shamrock Chemicals to Henkel KGAA of Dusseldorf, West Germany. Terms were not disclosed. The division makes specialty industrial chemicals, it said. Later, industry sources said the division, which had worldwide sales of some 160 mln dlrs last year, was sold for just under 200 mln dlrs.