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

萘的產(chǎn)品有工業(yè)萘和精萘兩種。 根據(jù)煤焦油蒸餾工藝的不同， 工業(yè)萘的原料有萘油餾分、 萘洗混合餾分和酚萘洗三混餾分等三種。 工業(yè)萘的提取工藝也有雙爐雙塔、 單爐單塔和加壓蒸餾等。 工業(yè)萘精制率分別為 ≥97%（萘油餾分） 、 96%～ 97%（萘洗混合餾分） 和 94%～ 95%（酚萘洗三混餾分） 。 所得工業(yè)萘產(chǎn)品標(biāo)準(zhǔn)見國標(biāo)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.

工業(yè)萘的結(jié)晶點(diǎn)測試是采用GB/T3069.2標(biāo)準(zhǔn)要求，SH406B 全自動結(jié)晶點(diǎn)儀就是嚴(yán)格按照GB/T3069.2這個(gè)標(biāo)準(zhǔn)設(shè)計(jì)制作的，為7英寸TFT彩色LCD顯示；制冷方式：全封閉制冷壓縮機(jī)。檢測方式： 進(jìn)口PT100測溫傳感器，升級后可儲存歷史數(shù)據(jù)，方便查詢；同時(shí)可配U盤輸出功能。

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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