<正> The capacity of caustic soda in Chinareached 12.4 million t/a in 2004 andthe output was 10.6026 million tons,with an increase of 13.6% over the pre-vious year.Of the total,the output ofion-membrane process caustic sodawas 2.5246 million tons,with an in-crease of 12.8% over the previous year,and the reminder was diaphragm pro-