Refined crude benzene and method for extracting thiophene

Abstract

The invention discloses refined crude benzene and a method for extracting thiophene, which belongs to the chemical field. According to the invention, crude benzene is taken as a main raw material, hydrogen, a catalyst NI-MO and an extract N-formylmorpholine as auxiliary materials, two benzene towers, an evaporator, a section of hydrogenation reactor, a lightness-removing tower, an extraction tower, a regeneration tower, two section of hydrogenation reactor and a fractionate tower as equipments, benzene series products and thiophene can be prepared by an extraction method; the method has the advantages that the reaction of whole production process is mild, the pressure and the temperature are low, the reduction of reaction pressure and temperature is in favor of reducing the making difficulty of the reactor, The making material and technology requirements of the reactor are greatly reduced, thereby the investment cost can be further reduced, The yield and the purity of the benzene series products are high, compared with other technology, thiophene products with high added value can be obtained.

Description

Technical field: [0001] The invention belongs to the field of chemical industry, and is characterized in that it relates to a method for refining crude benzene and extracting thiophene therefrom. Background technique: [0002] Crude benzene is one of the products in the crude gas generated during the coal coking process. The coke oven gas after deamination contains benzene, toluene, xylene, trimethylbenzene, thiophene, indene and other aromatics, in addition to unsaturated compounds, Sulfur-containing compounds, aliphatic hydrocarbons, naphthalene, phenols and pyridine compounds are called crude benzene. Crude benzene is a light yellow transparent liquid, lighter than water, insoluble in water, and forms a resinous substance due to oxidation and polymerization of unsaturated compounds during storage. Soluble in crude benzene, the color becomes dark. Due to the large number of coking industries in my country, a large amount of crude benzene is produced annually, and the dire...

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Problems solved by technology

[0003] In order to overcome the defects of serious pollution, low yield, difficult post-treatment, complex process of hydrorefining method, large equipment investment, high energy consumption and low yield by using the pickling and refining method in the refining process of crude benzene, the present invention uses crude benzene as Raw materials, pure benzene, toluene, xylene, solvent oil and thiophene are produced through crude benzene de-heavy, primary hydrogenation, de-light, extraction, secondary hydrogenation and rectification. A series of advantages such as simplicity, short production cycle, and high product purity. Compared with the traditional process, not only the product quality is better, but also pollution-free, the reaction is mild, and the reaction pressure and temperature are greatly reduced. The reduction of reaction pressure and temperature is conducive to reducing The difficulty of making the reactor, the material and process requirements of the reactor have been greatly reduced, further reducing the production cost