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用阴离子交换树脂法净化环丁砜贫溶剂，单位树脂净化量大于300。
The lean solvent sulfolane processing amount were larger than 300per mass of the anion-exchange resin.
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去离子水系统应包括再生离子交换床单位。
The Deionized Water System shall include regeneration units for the ion exchange beds.
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