Classifier Instance:

Anchor text: Castner process
Target Entity: Castner_process
Preceding Context: Sodium is now produced commercially through the electrolysis of molten sodium chloride, based on a process patented in 1924. This is done in a Downs Cell in which the NaCl is mixed with calcium chloride to lower the melting point below 700 °C. As calcium is less electropositive than sodium, no calcium will be formed at the anode. This method is less expensive than the previous
Succeeding Context: of electrolyzing sodium hydroxide.
Paragraph Title: Commercial production
Source Page: Sodium

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