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What is the required temperature of crystallization point in the national standard for industrial naphthalene?

萘的产物有工业萘和爱游戏app全站登录两种。 根据煤焦油蒸馏工艺的不同， 工业萘的原料有萘油馏分、 萘洗混合馏分和酚萘洗三混馏分等三种。 工业萘的提取工艺也有双炉双塔、 单炉单塔和加压蒸馏等。 工业萘精制率分别为 ≥97%（萘油馏分） 、 96%～ 97%（萘洗混合馏分） 和 94%～ 95%（酚萘洗三混馏分） 。 所得工业萘产物标准见国标GB6700 － 86。

Naphthalene products include industrial naphthalene and refined naphthalene. According to the different distillation processes of coal tar, the raw materials of industrial naphthalene include naphthalene oil fraction, naphthalene washing mixed fraction and phenol naphthalene washing triple mixed fraction. The extraction process of industrial naphthalene also includes double furnace and double tower, single furnace and single tower and pressurized distillation. The refining rate of industrial naphthalene is ≥ 97% (naphthalene oil fraction), 96% ～ 97% (naphthalene washing mixed fraction) and 94% ～ 95% (phenol naphthalene washing triple mixed fraction) respectively. See the national standard GB6700-86 for the product standard of industrial naphthalene obtained.

工业萘的结晶点测试是采用GB/T3069.2标准要求，SH406B 全自动结晶点仪就是严格按照GB/T3069.2这个标准设计制作的，为7英寸TFT彩色LCD显示；制冷方式：全封闭制冷压缩机。检测方式： 进口PT100测温传感器，升级后可储存历史数据，方便查询；同时可配U盘输出功能。

The crystallizing point test of industrial naphthalene adopts the requirements of GB/T3069.2 standard. The SH406B fully automatic crystallizing point meter is designed and manufactured in strict accordance with GB/T3069.2 standard, which is a 7-inch TFT color LCD display; Refrigeration mode: totally enclosed refrigeration compressor. Detection mode: Imported PT100 temperature sensor, which can store historical data after upgrading for easy query; At the same time, it can be equipped with U disk output function.

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