浓缩过的氢氧化纳通过压滤机过滤。
The concentrated sodium hydroxide is filtered through a pressure filter.
使用过的油需按要做滴定法来确定正确的氢氧化纳使用量。
For used oil, you should do a titration to determine the correct amount of NaOH to use.
回收氢氧化纳的主要目的是在经济方面，因为它大大补偿了化学药剂消耗费用。
The main goal of recovery of sodium hydroxide was the economies due to the high replacement cost of this chemical.
当被净化的纤维素与氢氧化纳溶液反应产生一种膨胀碱性纤维素时，HPMC就产生了，这种纤维素在化学上比没有经过处理的纤维素更易起反应。
HPMC is prepared when a purified form of cellulose is reacted with sodium hydroxide solution to produce a swollen alkali cellulose that is chemically more reactive than untreated cellulose.
当被净化的纤维素与氢氧化纳溶液反应产生一种膨胀碱性纤维素时，HPMC就产生了，这种纤维素在化学上比没有经过处理的纤维素更易起反应。
HPMC is prepared when a purified form of cellulose is reacted with sodium hydroxide solution to produce a swollen alkali cellulose that is chemically more reactive than untreated cellulose.
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