Process for preparing allyl chloride
AssigneeShell Oil Company
InventorDuraisamy Muthusamy
Life of this patent
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Abstract
The present disclosure is directed to upgrading to commercially useful products heavy ends by-products formed during the manufacture of allyl chloride. These heavy ends by-products are upgraded by first reacting the by-products with an alcohol in the presence of a base and subsequently pyrolyzing the resultant ethers to produce a mixture of allyl chloride and a carbonyl compound. This process improves the overall yield of the allyl chloride and forms commercially useful carbonyl compounds.
Claims25
A process for the production of allyl chloride comprising the steps of:
- (a) contacting a stoichiometric excess of propylene and a chlorinating agent at an elevated temperature at which allylic chlorine substitution predominantly takes place to produce a C.sub.3 -mixture-containing reaction effluent comprising allyl chloride, a dichloropropene and dichloropropane;
- (b) removing at least a major portion of the allyl chloride from the reaction effluent;
- (c) adding an alcohol and at least about one equivalent of a base, based on dichloropropene, to the remaining reaction effluent and contacting the alcohol and the dichloropropene under conditions effective to form an ether intermediate;
- (d) heating the ether intermediate containing reaction effluent at an effective temperature to react the ether intermediate and the dichloropropane to produce allyl chloride;
- and
- (e) recovering the allyl chloride.
A process for upgrading the heavy ends by-products formed during the preparation of allyl chloride comprising the steps of:
- (a) providing a heavy ends by-product stream comprising a dichloropropene and dichloropropane from a chlorination reaction of propylene with a chlorinating agent;
- (b) contacting said dichloropropene and an alcohol in the presence of an effective amount of a base to form an ether intermediate;
- (c) heating said ether intermediate and said dichloropropane at an effective temperature to produce allyl chloride;
- and
- (d) recovering the allyl chloride.
Dependencies are inferred from the claim text.