Method for preparing 1-chloro isoamylene

This invention relates to 1-chlorine era isoamylene preparation method, materials are isoprene and hydrogen chloride. Procedures are that 1) isoprene is additive reacted with hydrogen chloride to generate compound of 1-chlorine era isoamylene and 3-chlorine era isoamylene. 2) Product of the reaction is isomerization reacted to transform by-product 3-chlorine era isoamylene into 1-chlorine era isoamylene. Charging way of procedure 1) is that isoprene firstly mixed with the addition reaction product, then hydrogen chloride gas is fed in, the additive reaction temperature is -5-0 degree centigrade, weight ratio of isoprene and the product is 1 to (5-80). The product of the isomerization reaction is twice rectified to get 1-chlorine era isoamylene refined product. By-reaction that generating 2-chlorine era isopentene is restrained, and acid and water are not brought in, so corrosion protection request is reduced, and rectify product is easy at the same time.