MwB降膜結(jié)晶法精萘裝置的工藝及生產(chǎn)，第一階段，精萘生產(chǎn)工藝沿用前蘇聯(lián)技術(shù)，即由焦油蒸餾所得的萘油餾分生產(chǎn)壓榨茶，萘餅熔化后經(jīng)酸洗凈化和簡單蒸餾得產(chǎn)品精萘。由于該工藝存在生產(chǎn)wik]環(huán)境[wikj惡劣、洗滌需消耗大量酸堿且有外排廢液、煤氣直接加熱蒸餾釜。

The process and production of MwB falling-film crystallization naphthalene refining unit. In the first stage, the production process of refined naphthalene follows the former Soviet Union technology, that is, the naphthalene oil fraction obtained from tar distillation is used to produce pressed tea, and the naphthalene cake is melted and purified by acid washing and simple distillation to obtain the product refined naphthalene. Due to the production wik] environment [wikj] of the process, a large amount of acid and alkali need to be consumed for washing, and there is waste liquid discharged and gas directly heating the distillation kettle.

裝置熱效率低且不安全以及壓榨wikj設(shè)備[/wikj]的備品備件奇缺，難以長期維持穩(wěn)定生產(chǎn)等原因，于1 989年停產(chǎn)，并轉(zhuǎn)產(chǎn)工業(yè)萘第二階段從1989年至1994年，采用雙爐雙塔工藝，以萘洗混合餾分為原料生產(chǎn)工業(yè)萘，不僅較好地解決了，上述問題，還極大地改善

Due to the low and unsafe thermal efficiency of the unit and the scarcity of spare parts for the press wikj equipment [/wikj], which is difficult to maintain stable production for a long time, the production was stopped in 1989 and converted to industrial naphthalene in the second stage from 1989 to 1994. The production of industrial naphthalene with naphthalene washing mixed fraction as raw material was carried out by the two-furnace two-tower process, which not only solved the above problems, but also greatly improved

操作環(huán)境。1992 年以來為第三階段，為提高萘產(chǎn)品附加值，我們于19正式簽約，引進(jìn)該公司年產(chǎn)2萬噸精萘的MWB降膜結(jié)晶法精萘裝置，并于1994年12月投產(chǎn)，生產(chǎn)出了合格的精萘產(chǎn)品，各項技術(shù)經(jīng)濟(jì)指標(biāo)均達(dá)到預(yù)期目標(biāo)，從而使我廠的精萘生產(chǎn)技術(shù)進(jìn)入了嶄新的階段.

Operating environment. Since 1992, it has been the third stage. In order to increase the added value of naphthalene products, we formally signed a contract on 19 to introduce the company's MWB falling-film crystallization naphthalene refining unit with an annual output of 20000 tons of refined naphthalene, and put it into operation in December 1994, producing qualified refined naphthalene products, and all technical and economic indicators have reached the expected goals, thus bringing our refined naphthalene production technology into a new stage

萘是一種重要的有機(jī)化工原料，主要用于催化氧化制苯酐和中間染料的制備,此外也用于水泥減水劑、偶氮染料、表面活性劑和分散劑,同時在增塑劑、樹脂、合成纖維、藥物和各種新型化學(xué)試劑領(lǐng)域也有應(yīng)用。工業(yè)茶產(chǎn)品的質(zhì)量分?jǐn)?shù)在95%左右,如果直接以工業(yè)萘作為原料進(jìn)行有機(jī)合成,會對下游產(chǎn)品的質(zhì)量、生產(chǎn)定額的消耗和裝置運(yùn)行的穩(wěn)定性產(chǎn)生一定影響,難以有效實現(xiàn)工業(yè)萘的價值"，為滿足精細(xì)化工產(chǎn)業(yè)對蔡的質(zhì)量要求，必須尋找一種高效可行的精制方法對工業(yè)萘進(jìn)行提純。

Naphthalene is an important organic chemical raw material, which is mainly used for the preparation of phthalic anhydride and intermediate dyes by catalytic oxidation. It is also used as cement water-reducing agent, azo dyes, surfactant and dispersant. It is also used in plasticizers, resins, synthetic fibers, drugs and various new chemical test agents. The mass fraction of industrial tea products is about 95%. If industrial naphthalene is directly used as raw material for organic synthesis, it will have a certain impact on the quality of downstream products, consumption of production quota and stability of plant operation, and it is difficult to effectively realize the value of industrial naphthalene. "In order to meet the quality requirements of fine chemical industry for Cai, we must find an efficient and feasible refining method to purify industrial naphthalene.

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