Claims
- 1. The method which comprises
- isomerizing in an isomerization operation a charge stream containing at least one diisopropyl toluene other than 1-methyl-3,5-diisopropyl benzene in the presence of isomerization catalyst at isomerization conditions including temperature of 200.degree. F.-800.degree. F. thereby forming isomerized product stream containing increased proportions of 1-methyl-3,5-diisopropyl benzene and decreased proportions of other diisopropyl toluenes in the diisopropyl toluene fraction;
- recovering from said isomerizing operation and isomerized product stream containing said 1-methyl-3,5-diisopropyl benzene and decreased proportions of other diisopropyl toluene; and
- separating 1-methyl-3,5-diisopropyl benzene from said isomerized product stream.
- 2. The method claimed in claim 1 wherein said isomerization conditions include temperature of about 350.degree. F.-550.degree. F.
- 3. The method claimed in claim 1 wherein said isomerization conditions include temperature of about 440.degree. F.-550.degree. F.
- 4. The method claimed in claim 1 wherein said isomerization catalyst contains silica-alumina.
- 5. The method which comprises
- transalkylating in a transalkylation operation a charge stream containing (i) toluene, (ii) desired 1methyl-3,5-diisopropyl toluene and at least one other undesired diisopropyl toluene, and (iii) triisopropyl toluenes, at transalkylating conditions including temperature of 500.degree. F.-625.degree. F. thereby forming transalkylated product stream containing 1-methyl-3,5-diisopropyl benzene and decreased proportions of (i) toluene, (ii) said other undesired diisopropyl toluene, and (iii) said triisopropyl toluenes;
- recovering said product stream containing 1-methyl-3,5-diisopropyl benzene and decreased proportions of (i) toluene, (ii) said other undesired diisopropyl toluene, and (iii) said triisopropyl toluenes; and
- separating 1-methyl-3,5-diisopropyl benzene from said product stream containing 1-methyl-3,5-diisopropyl benzene and decreased proportions of (i) toluene, (ii) said other undesired diisopropyl toluene, and (iii) said triisopropyl toluenes.
- 6. The method which comprises
- contacting a charge stream containing at least one diisopropyl toluene other than 1-methyl-3,5-diisopropyl benzene with silica-alumina cracking catalyst at 200.degree. F.-800.degree. F. thereby forming product stream containing increased proportions of 1-methyl-3,5-diisopropyl benzene and decreased proportions of other diisopropyl toluenes;
- recovering said product stream containing increased proportions of 1-methyl-3,5-diisopropyl, benzene and decreased proportions of other diisopropyl toluenes,
- and
- separating 1-methyl-3,5-diisopropyl benzene from said product stream.
Parent Case Info
This is a continuation, of application Ser. No. 135,609, filed Mar. 31, 1980, now U.S. Pat. No. 4,314,091.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
135609 |
Mar 1980 |
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