Japan’s Toshiba Equipment Construction Corporation is building a 1,000 t/a test facility to produce styrene monomer from waste polystyrene (PS) foam and disks and plates. This kit was launched in June last year, started operating for 3 months, and then the company plans to transfer this technology.
The company claims that good results have been obtained with tests on a 5-10 kg/h pilot unit in which the molten waste PS was fed to a tubular reactor and decomposed between about 6.6 kPa vacuum and 500-700°C. The decomposed material is fed to two vacuum distillation columns connected in series. The first column separates the lighter fractions, and the second column separates the heavier fractions to obtain 99.83% purity styrene monomer.
The monomer yield is about 70% of the waste PS. The remaining 30% is mainly heavy oil, used for heating in production. The company estimates that the infrastructure cost for processing a 3000t/a PS unit is approximately US$3 million, and the investment can be recovered in two to four years.
The company claims that good results have been obtained with tests on a 5-10 kg/h pilot unit in which the molten waste PS was fed to a tubular reactor and decomposed between about 6.6 kPa vacuum and 500-700°C. The decomposed material is fed to two vacuum distillation columns connected in series. The first column separates the lighter fractions, and the second column separates the heavier fractions to obtain 99.83% purity styrene monomer.
The monomer yield is about 70% of the waste PS. The remaining 30% is mainly heavy oil, used for heating in production. The company estimates that the infrastructure cost for processing a 3000t/a PS unit is approximately US$3 million, and the investment can be recovered in two to four years.
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