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基于板材行业中使用的脲醛树脂胶大部分存在游离甲醛超标的问题,提出了新型强化传递过程技术-超重力技术。为了考察空气和水蒸汽两种气提气体通过旋转填料床对脲醛树脂中游离甲醛的脱除效率,在相同的实验条件下,以空气和水蒸汽为气提气体分别进行脲醛树脂脱除甲醛的实验。结果显示水蒸汽对甲醛的脱除率最高为60.1%,空气为58%。说明水蒸汽对甲醛的脱除率略高于空气,并且随进气量的增大脱除率呈现先增大后减小的趋势。对此结果作了理论分析,并指出了两种气体作为气提气体各自的特点。
Based on the problem that the majority of urea formaldehyde resin used in the plate industry has excessive free formaldehyde, a new enhanced transmission process technology - super gravity technology is proposed. In order to investigate the removal efficiency of free formaldehyde from urea and urea by air and water vapor through rotary packed bed, under the same experimental conditions, air and water vapor were used as stripping gas to remove formaldehyde from urea-formaldehyde resin experiment. The results showed that the highest removal rate of water vapor to formaldehyde was 60.1% and the air was 58%. The results show that the removal rate of formaldehyde to water vapor is slightly higher than that of air, and the removal rate increases first and then decreases with the increase of gas intake. The result is analyzed theoretically, and the characteristics of the two kinds of gas as the stripping gas are pointed out.