研究了以煤系高岭土为原料，经硫酸处理后采用水热转化法合成洗涤剂用4A沸石的方法。
The synthesis of detergent-used 4A zeolite from coal-series Kaolin which was treated with sulfuric acid firstly was studied.
用红外与紫外光谱法、热分析和分子量测定研究了硬聚氯乙烯在硝酸和硫酸中的老化。
The ageing of rigid polyvinyl chloride (R-PVC) aggravated by nitric and sulfuric acids was studied by IR, UV Spectroscopy, thermo-analysis and molecular weight determination.
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