工业精萘颜色重是什么原因导致的？实际上不管是液体的还是固体的，存放时间长了都会变深，液体的为明显，可能里面多苯环物质与空气氧化的原因吧，总之里面肯定有物质易被空气氧化。酚油也是这个现象，刚刚出来的是无色水状，过段时间就变暗红了。

What causes the heavy color of industrial naphthalene? In fact, whether it is liquid or solid, it will become deeper after being stored for a long time. The liquid is more obvious. Maybe there are many benzene ring substances in it and the reason for air oxidation. In short, there must be substances in it that are easy to be oxidized by air. Phenolic oil is also this phenomenon. It just comes out in colorless water, and it turns dark and red after a period of time.

如果是每次开工时一个阶段颜色发黄，有可能是设备、管道的铁锈。如果是经常性的，说明精萘当中的少量杂质容易氧化，可以进一步提高精萘纯度，或者在操作环节减少氧化。

If the color turns yellow at one stage of each construction, it may be the rust of equipment and pipeline. If it is regular, it indicates that a small amount of impurities in refined naphthalene are easy to oxidize, which can further improve the purity of refined naphthalene or reduce oxidation in operation.

变色应该是由白变淡红色，再变成红棕色，后变成黑棕色吧。如果是说明工业萘中的杂酚脱除不干净的缘故。酚类物质在阳光照射下，所带的羟基易被空气氧化成羰基，这样酚类就变成了醌类物质啦，而醌类物质是工业染料一个大种类。醌类如苯醌、萘醌等等。

The color change should be from white to light red, then red brown, then black brown. If this is the reason why the impurity phenol in industrial naphthalene is not removed cleanly. Under sunlight, the hydroxyl group of phenols is easy to be oxidized into carbonyl group by air, so phenols become quinones, and quinones are a major category of industrial dyes. Quinones such as benzoquinone, naphthoquinone, etc.

针对工业萘颜色变深的原因分析，从两个方面对系统进行了改造，一方面改善萘油洗涤系统的洗涤脱酚效果;另-方面在工业萘原料槽底部增加放酚盐管线。

According to the analysis of the reasons for the darkening of industrial naphthalene, the system has been reformed from two aspects: on the one hand, the washing and dephenolization effect of naphthalene oil washing system has been improved; On the other hand, phenol salt discharge pipeline shall be added at the bottom of industrial naphthalene raw material tank.

1)改善萘油洗涤系统的洗涤脱酚效果的措施是萘油洗涤系统增加管道混合器。

1) The measure to improve the washing and dephenolization effect of naphthalene oil washing system is to add pipeline mixer in naphthalene oil washing system.

原萘油洗涤系统萘油和稀碱在喷射混合器内进行混合反应，进入洗涤塔后澄清分离，生成合格的脱酚萘油和中性酚盐。在系统运行中，由于萘油和稀碱只在喷射混合器接触反应，时间短，反应效果低，为增加反应时间，增强反应效果，在萘油洗涤塔的喷射混合器后，另增加管道混合器，以增强脱酚效果。

The naphthalene oil and dilute alkali of the original naphthalene oil washing system are mixed and reacted in the jet mixer. After entering the washing tower, they are clarified and separated to produce qualified dephenolized naphthalene oil and neutral phenol salt. During the system operation, because naphthalene oil and dilute alkali only react in contact with the jet mixer, the reaction time is short and the reaction effect is low. In order to increase the reaction time and enhance the reaction effect, another pipeline mixer is added after the jet mixer of naphthalene oil scrubber to enhance the dephenolization effect.

2)工业萘原料槽增加放酚盐管线。

2) The phenol salt discharge pipeline is added to the industrial naphthalene raw material tank.

为了保证工业萘蒸馏时酚盐不被带入蒸馏系统，对工业萘原料槽增加放酚盐管线到地下放空槽，投用前将底部酚盐放净，避免酚盐进入蒸馏系统影响工业萘颜色。

In order to ensure that the phenol salt will not be brought into the distillation system during the distillation of industrial naphthalene, the phenol salt pipeline will be added to the raw material tank of industrial naphthalene to the underground vent tank, and the phenol salt at the bottom will be drained before use to prevent the phenol salt from entering the distillation system and affecting the color of industrial naphthalene.

系统经过改造，增加的管道混合器能够满足工艺要求，工业萘原料槽增加的放酚盐管线也运行正常，产品的质量和颜色得到明显改善。

The system has been revamped, and the added pipeline mixer can meet the process requirements, and the added phenol discharge pipeline of the industrial naphthalene raw material tank also operates normally, and the product quality and color have been significantly improved.

通过对工业萘产品进行定性地分析，确定了导致工业萘颜色变深的主要原因，并制定实施了与之相对应的措施，增加了萘油洗涤的脱酚效果，提高了酚类产品的回收率，工业萘产品的颜色得到了较大的改善。针对此产品您有需求就来我们网站http://www.jnjdbc.cn咨询吧！

Through qualitative analysis of industrial naphthalene products, the main causes of darkening of industrial naphthalene were determined, and corresponding measures were formulated and implemented to increase the dephenolization effect of naphthalene oil washing, improve the recovery rate of phenolic products, and greatly improve the color of industrial naphthalene products. Come to our website if you have any demand for this product http://www.jnjdbc.cn Ask!