FIELD: chemical industry. SUBSTANCE: present invention describes process for preparing 1-chloro-1,3-butadiene by dehydrochlorination of dichlorobutenes selected from 3,4- dichlorobutene-1, 1,4-dichlorobutene-2 or mixtures thereof. Reaction is carried out in gas phase in the presence of catalyst selected from lanthanum phosphate or lanthanum phosphate comprising alkali or alkaline-earth metal additive, or mixtures of said phosphates. EFFECT: simpler and cheaper claimed process. 4 cl, 4 ex, 2 tbl
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