Returning an olefin which is not reacted during the oxidation of olefins
AssigneeBASF SE
InventorsPeter Bassler, Hans-Georg Goebbel, Joaquim Henrique Teles, Peter Rudolf
Life of this patent
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Abstract
Process for the continuous recirculation of the olefin which has not been reacted in the epoxidation of olefins by means of hydroperoxide to give oxiranes and is present in the offgas stream formed during the epoxidation, which comprises the steps (i) to (iii) (i) compressing and cooling the offgas stream, (ii) seperating the olefin from the offgas stream obtain in step (i) by distillation, (iii) epoxidizing the olefin seperating off in step (ii) by means of hydroperoxide.
Claims29
A process for the continuous recirculation of an olefin which has not been reacted in the epoxidation of olefins by means of hydroperoxide to give oxiranes and is present in an offgas stream formed during the epoxidation, comprising:
- (i) compressing and cooling the offgas stream,
- (ii) separating the olefin from the offgas stream obtained in step (i) by distillation,
- (iii) epoxidizing the olefin separated off in step (ii) by means of hydroperoxide, wherein the offgas stream comprises unreacted olefin and oxygen.
A process for the continuous recirculation of an olefin which has not been reacted in the epoxidation of the olefin by means of hydroperoxide to give oxiranes and is present in an offgas stream formed during the epoxidation, comprising:
- (i) compressing and cooling the offgas stream,
- (ii) separating the olefin from the offgas stream obtained in step (i) by distillation,
- (iii) epoxidizing the olefin separated off in step (ii) by means of hydroperoxide, wherein, in step (i), the offgas stream is compressed to a pressure of from 2 to 30 bar,
- cooled to from 0 to 70° C., and
- wherein compression occurs in at least two stages in step (i), and
- the offgas stream comprises unreacted olefin and oxygen.
A process for the continuous recirculation of an olefin which has not been reacted in the epoxidation of olefins by means of hydroperoxide to give oxiranes and is present in the offgas stream formed during the epoxidation, comprising:
- (i) compressing and cooling the offgas stream,
- (ii) separating the olefin from the offgas stream obtained in step (i) by distillation,
- (iii) epoxidizing the olefin separated off in step (ii) by means of hydroperoxide, wherein the olefin is propene,
- the offgas stream further comprises propane,
- in step (i), the offgas stream is compressed to a pressure of from 12 to 20 bar,
- cooled to from 30 to 40° C., and the offgas stream comprises unreacted olefin and oxygen.
A process for the continuous recirculation of propene which has not been reacted in the epoxidation of propene by means of hydroperoxide to give propene oxide and is present in an offgas stream formed during the epoxidation, comprising:
- (i) compressing and cooling the offgas stream,
- (ii) separating propene from the offgas stream obtained in step (i) by distillation,
- (iii) epoxidizing the propene by means of hydroperoxide,
- wherein the offgas stream comprises propene, propane and oxygen, and
- wherein
- in step (i), the offgas stream is cooled to from 30 to 40° C. and compressed to a pressure of from 12 to 20 bar,
- a mixture of propene and propane is obtained in bottoms from a column after distillation in step (ii), and
- said mixture is separated into propene and propane in a C3 splitter.
Dependencies are inferred from the claim text.