C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
202/68, 260/328.
C07D 333/48 (2006.01)
Patent
CA 1236469
RECOVERY OF SULFOLANE ABSTRACT I In a process for the production of t-butylstyrene by oxydehydrogenation of t-butylethylbenzane, sulfolane solvent employed in the preparation of purified t-butylstyrene product is recovered for recycle by extraction of aqueous sulfolane with a liquid aliphatic or aromatic hydrocarbon having a boiling point less than the boiling point of sulfolane. The raffinate is then distilled to recover sulfolane containing only small quantities of water and substantially free of organic contaminants. BACKGROUND OF THE INVENTION The invention relates broadly to a solvent recovery process and in particular to the recovery of sulfolane used in the purification of t-butylstyrene. Tertiary-butylstyrene (tBS) is a compound which is advantageously prepared by catalytic oxydehydrogenation of t-butylethylbenzene (tBEB). It has many uses, e.g. as a chemical intermediate, as a monomer or comonomer in the production of polymeric materials and the like. Tertiary-butylstyrene has often replaced styrene in some applications because desirable physical and chemical product properties result from such a substitution. In addition, there are processes where styrene is not suitable but where tertiary-butylstyrene functions well. Because tBS belongs to the same family as styrene, there are similarities in the chemistry. One of the common properties is the tendency for the styrenics to polymerize whenever they are activated by chemicals or by heat. Some of the techniques used in purifying styrene can be used to purify tBS. However, because the boiling point of tBS is about 70°C higher than that of styrene, the tendency for tBS to polymerize is much greater than that of styrene in any of the commercial processes for purifying styrene. Some of the differences between styrene and tBS are derived from the compounds of the dialkenylbenzene family, that are present in tBS but not in styrene. These crosslinking compounds can polymerize to give a type of -1-
480809
Crum Glen F.
Mchaney Stephen C.
El Paso Products Company
Gowling Lafleur Henderson Llp
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