以粗苯为溶剂萃取脱酚，粗苯的主要消耗是其在处理后氨水中溶解的损失。
The major problem of solvent extraction dephenolization process is that crude benzol dissolve in ammonia liquor.
以磷石膏、碳酸氢铵和氨水为原料制备硫酸铵，并用盐酸处理碳酸钙粗品制备氯化钙。
Ammonium sulphate with calcium carbonate as gross by-product could be obtained from the raw materials including phosphogypsum, ammonium bicarbonate and ammonia water.
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