Generally, chlorine gas has been liquefied by compressing it to 1.1 to 1.3 MPa and thereafter by condensing it with cooling water. It is well known that reciprocating compressors were widely used so far for this purpose. But there are some demerits in maintenance, which costs high and takes much time. Hence the authors have been concentrated on developing a screw compressor for easy maintenance, which features in using concentrated sulfuric acid as an injected lubricant. This lubricant injection enables us to compress in a single stage with even a high compression ratio and an outlet temperature lower than 55°C. In addition we paid much attention to a driving mechanism with a timing gear, mechanical seals to separate from oil bearing parts, as well as structural materials(special high silica stainless steal). This paper reports its performance data and operational experiences for a year.
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