| abstract |
THE PROCESS DISCLOSED HEREIN COMPRISES A METHOD FOR PREPARING 1,2-BUTADIENE BY THE ZINC, DUST, ETC. DEHYDROCHLORINATION OF DICHLOROBUTENE, SPECIFICALLY 2,3-DICHLORO-1-BUTENE, OR 1,2-DICHLORO-2-BUTENE, OR A MIXTURE THEREOF. SUCH DICHLOROBUTENE CAN BE PREPARED BY THE REACTION OF 1,2,3TRICHLOROBUTANE WITH SOLID KOH. ADVANTAGEOUSLY THE TRICHLOROBUTANE IS PREPARED BY THE REACTION OF CHLORINE WITH EITHER 1-CHLORO-2-BUTENE OR 3-CHLORO-1-BUTENE OR A MIXTURE THEREOF. ONE OF THE ADVANTAGES OF THE PRESENT PROCESS IS THE FACT THAT 1,3-BUTADIENE CAN BE REACTED WITH CONCERNTRATED HYDROCHLORIC ACID TO GIVE A MIXTURE OF THE ABOVE MENTIONED MONOCHLOROBUTENES. THUS THE PROCESS PROVIDES A RELATIVELY INEXPENSIVE METHOD OF PREPARING 1,2-BUTADIENE FROM 1,3-BUTADIENE. |