Process for rearranging allylic geminal dihalogen compounds
AssigneeThe Dow Chemical Company
InventorLarry N. Ito
Life of this patent
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Abstract
An improved process for converting 3,3-dichloropropene in an intermediate boiling byproduct stream from a process of making allyl chloride by the chlorination of propylene to cis- or trans-1,3-dichloropropene or a mixture of these, wherein the intermediate boiling byproduct stream is processed batchwise or continuously to dry the stream to a water content of less than about 15 parts per million by weight, and then is contacted in the liquid phase with an alumina, silica or zeolite catalyst under conditions effective to carry out the conversion.
Claims14
In a process for preparing a dihaloalkene compound of the formula ##STR3## wherein X represents chloro or bromo
- R.sup.1, R.sup.2, R.sup.3, and R.sup.4 independently represent hydrogen or a C.sub.1 -C.sub.3 alkyl group, with the proviso that when X represents bromo each of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 represents hydrogen
- or a mixture of such compounds, which process comprises contacting a dihaloalkene compound of the formula ##STR4## wherein X represents chloro or bromo and
- R.sup.1, R.sup.2, R.sup.3, and R.sup.4 independently represent hydrogen or a C.sub.1 -C.sub.3 alkyl group, with the proviso that when X represents bromo each of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 represents hydrogen
- in the liquid state with an effective catalyst selected from the group consisting of aluminas, silicas and zeolites under conditions effective to carry out the conversion, the improvement which comprises drying the dihaloalkene compound to be processed in said process or a stream or aggregation comprising the dihaloalkene compound to be so processed, prior to contacting the dihaloalkene compound with the alumina, silica or zeolite catalyst.
Dependencies are inferred from the claim text.