用工業(yè)萘小批量生產(chǎn)精萘的流程如下：將硫酸加入熔融的萘中脫水，攪拌后靜置分離廢酸。再加入98的硫酸，在85-95℃條件下攪拌40分鐘，靜置分離廢酸。在攪拌下加入37%的甲醛溶液在85-95℃條件下攪拌50分鐘，加溫水攪拌后靜置，分層聚合物及磺化物料。用10氫氧化鈉溶液中和PH到7-8，靜置后除去廢堿。較后蒸餾冷卻可得到精萘產(chǎn)品。

The process of small batch production of refined naphthalene from industrial naphthalene is as follows: add sulfuric acid into molten naphthalene for dehydration, stir and stand to separate waste acid. Add 98% sulfuric acid, stir at 85-95 ℃ for 40 minutes, and stand to separate the waste acid. Add 37% formaldehyde solution under stirring, stir at 85-95 ℃ for 50 minutes, stir with warm water and stand, and layer the polymer and sulfonated material. Neutralize pH to 7-8 with 10 sodium hydroxide solution, and remove waste alkali after standing. Refined naphthalene can be obtained by later distillation and cooling.

石油萘

Petroleum naphthalene

石油萘的原料來自于催化重整、催化裂化和烴類裂解等過程的重芳烴組分。在催化重整油中，甲基萘的含量約為55。經(jīng)過萃取和吸附，從原料餾分中分離出萘的各種同系物，然后采用催化臨氫脫烷基的方法，以Cr2O3-Al2O3為催化劑，在400-800℃和0.5-7兆帕下進行臨氫脫甲基反應(yīng)，反應(yīng)產(chǎn)物經(jīng)冷卻氣相物質(zhì)后，蒸餾除去輕組分苯、甲苯、二甲苯等，較后進一步精餾可得到石油萘產(chǎn)品。產(chǎn)品用溶劑吸收和溶劑洗滌的方法進行提純，純度可達99.73。

The raw materials of petroleum naphthalene come from heavy aromatic components in catalytic reforming, catalytic cracking and hydrocarbon cracking. The content of Methylnaphthalene in catalytic reforming oil is about 55. After extraction and adsorption, various homologues of naphthalene are separated from the raw material fraction, and then the hydrodemethylation reaction is carried out with Cr2O3-Al2O3 as catalyst at 400-800 ℃ and 0.5-7 MPa. After cooling the gas phase substances, the reaction products are distilled to remove the light components such as benzene, toluene and xylene, and then the petroleum naphthalene products can be obtained by further distillation. The product is purified by solvent absorption and solvent washing, and the purity can reach 99.73.

據(jù)估計，以輕柴油為裂解原料的年產(chǎn)30萬噸的乙烯裝置，，可副產(chǎn)焦油9萬噸，其中萘和萘潛量為4-5萬噸。

It is estimated that the ethylene plant with an annual output of 300000 tons using light diesel as cracking raw material can produce 90000 tons of tar, including 40000-50000 tons of naphthalene and naphthalene potential.

沸點217.9℃；不溶于水，溶于無水乙醇

Boiling point 217.9 ℃; Insoluble in water, soluble in absolute ethanol

制取1-萘酚、2-萘酚等染料中間體, 生產(chǎn)增塑劑、合成樹脂、合成表面活性劑等。

Prepare 1-naphthol, 2-naphthol and other dye intermediates, and produce plasticizers, synthetic resins, synthetic surfactants, etc.

萘，又稱并萘，是一種無色有光澤的片狀結(jié)晶。不溶于水，易升華，能隨水蒸氣揮發(fā)，有特殊氣味。是工業(yè)上較重要的稠環(huán)芳烴，可用于生產(chǎn)苯酐、染料的中間體、橡膠助劑和殺蟲劑。

Naphthalene, also known as naphthalene, is a colorless and shiny flake crystal. Insoluble in water, easy to sublimate, can volatilize with water vapor and has a special smell. It is an important polycyclic aromatic hydrocarbon in industry. It can be used in the production of phthalic anhydride, dye intermediates, rubber additives and pesticides.

根據(jù)純度不同，萘可分為工業(yè)萘和精萘。

According to different purity, naphthalene can be divided into industrial naphthalene and refined naphthalene.

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