Alpha methyl styrene

ALPHA-METHYL STYRENE ETHYL BENZOATE N-PROPYLBENZENE ISOPROPYLBENZENE l-METHYL-2-ETHYLBENZENE... 

The effluent from the acid treatment reactor is about 60% phenol, 35% acetone, plus some miscellaneous nits and lice, most of which, are alpha-methyl styrene, and acetophenone. The effluent is passed through a separator where the acid, water, and salts drop out. The balance of the processing is a series of distillation columns that split out the various streams. 

The alpha-methyl styrene can be recovered as a product or catalytically treated with hydrogen and converted back to cumene for recycling. The acetophenone has some commercial use in pharmaceuticals and at one time was used to make ethylbenzene. A high purity phenol is sometimes made by a crystallization step, since phenol freezes at about 109°F. With alpha-methyl styrene recycled, the ultimate yield is about 97%. 

R.C. Leiberich, R. Dohm, H.C. Waldmann, and H. Alberts, Preparation of alpha-san copolymers from alpha-methyl styrene and acrylonitrile, DE Patent 19618832, assigned to Bayer AG, November 13,1997. 

The results of the isotactic polymerization of styrene and the polymerization of alpha-methyl styrene with transition metal alkyl catalysts have been summarized in Fig. 6. Alphamethylstyrene is polymerized by... 

Application Improved technology to produce highest quality phenol and acetone from cumene. Refined alpha methyl styrene (AMS) production is optional. High yield is achieved at low operating and capital costs without tar cracking. 

CDTECH Cumene Crude cumene Selective hydrogenation of alpha methyl styrene in a distillation column to produce purified cumene distillate NA NA... 

Saeki, S. Narita, Y. Tsubokawa, M. Yamaguchi, T., "Phase Separation Temperatures in the Polystyrene-Poly(alpha-methyl styrene)- Methylcyclohexane System," Polymer, 24, 1631 (1983). 

Poly(alpha-methyl styrene) 168 — Poly(vinyl alcohol) 85 —... 

Poly--Ethylene -Propylene -Methyl acrylate -Isobutene -Methyl methacrylate -alpha-Methyl styrene... 

An important industrial application of CD is the alkylation of benzene with ethylene or propylene to produce ethylbenzene or cumene, respectively, using acidic ion-exchange resins such as Amberlyst or zeolites operating at 130-5065 kPa and 80-500°C. Cumene is a chemical intermediate for the production of phenol, acetone, and alpha-methyl styrene, which are used to produce resins and solvents. Ethylbenzene is an intermediate for styrene, an important monomer for polymers. Alkylation of benzene could also be used to reduce the carcinogenic benzene content of gasoline. 

Figure 18 shows the LAMMA 1000 negative spectrum for Poly Alpha Methyl Styrene, an unzippable polymer (meaning that it breaks apart sequentially as monomers). Again, an EI mass spectroscoplst would recognize the material. 

POLY ALPHA METHYL STYRENE Unzlppoble polymer... 

Figure 18. Poly alpha methyl styrene, an unzippable polymer—by LAMMA. (Reproduced with permission from Ref. Copyright 1983 International Conference on X-ray Optics and Microscopy.)...

Alpha- Methyl- styrene 137 1.9 6.1 Dry chemical, foam, carbon dioxide Water may be ineffective Data not available 1066 No ... 

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