The effect of low-purity PX on the process parameters and technical index of residue oxidation system of PTA plant was described.
阐述了使用低纯度对二甲苯（PX）对PTA装置氧化残渣系统工艺参数、技术指标的影响。
2
For the future, the demand of high-purity chloroacetic acid will be strong, the market of low-purity products with content being less than 98% will increasingly drop.
今后市场对高纯度氯乙酸产品的需求将保持旺盛，含量在98%以下的低纯度产品市场将日益缩减。
3
Quartz Wool was made from high-purity quartz, extremely low in metallic oxide impurities.