Method for preparing high purity isobutene using glycolether
AssigneeDaelim Industrial Co., Ltd.
InventorsMyeong-Seok Kim, Jae-Hoon Uhm, Min-Sup Park, Hyoung-Jae Seo, Kyoung-Tae Min
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Abstract
Disclosed is a method of preparing isobutene in which high-purity isobutene is separated (prepared) from a C4 mixture by cracking glycol ether prepared from a C4 mixture (in particular, C4 raffinate-1) containing isobutene and a glycol. The method includes cracking glycol ether into isobutene and glycol at a temperature between 50° C. and 300° C. in the presence of a strongly acidic catalyst. The glycol ether may be prepared by reaction between a C4 mixture containing isobutene and glycol in the presence of an acid catalyst.
Claims7
A method of preparing isobutene, comprising the sequential steps of:
- a) reacting a C4 mixture containing isobutene with glycol in the presence of an acid catalyst to provide a glycol ether, wherein said glycol ether comprises glycol di-t-butyl ether and glycol mono-t-butyl ether, and wherein an amount of glycol di-t-butyl ether is larger than an amount of glycol mono-t-butyl ether;
- b) separating said glycol ether from the unreacted C4 mixture and glycol;
- and
- c) cracking said glycol ether into isobutene and glycol at a temperature between 50° C. and 300° C. in the presence of a strongly acidic catalyst, wherein the glycol di-t-butyl ether of said glycol ether is completely decomposed.
Dependencies are inferred from the claim text.