Method and device for continuous carbonization and distillation to produce beta-naphthol with solvent method

Abstract

The invention discloses a method and a device for continuous carbonization and distillation to produce beta-naphthol with a solvent method. The method comprises an extraction procedure, an A removal procedure, a repeated carbonization procedure, a repeated distillation procedure, a rectification procedure and a packing procedure. The technological processes are simplified; the method is an important innovation of a traditional technology, and has excellent economic benefits and profound environmental influence; the production cost of a naphthalene series intermediate, beta-naphthol, is greatly reduced; the yield and the quality of the beta-naphthol are greatly improved; and the method has profound and far-reaching influences on development of industries of naphthalene series dyes and pigments in energy conservation, emission reduction and environmental protection. The device comprises an extract mother liquid tank, a mixer, an A-removal rectification tower, a carbonization reaction kettle, a beta-naphthol crude product distillation tower, a beta-naphthol product rectification tower and a slice packing device; and the extract mother liquid tank is sequentially connected with the mixer, the A-removal rectification tower, the carbonization reaction kettle, the beta-naphthol crude product distillation tower, the beta-naphthol product rectification tower and the slice packing device.

Description

technical field [0001] The invention belongs to the technical field of beta-naphthol production, and in particular relates to a method and a device for producing beta-naphthol by continuous carbonization and rectification by solvent method. Background technique [0002] At present, the industrial production of β-naphthol both at home and abroad adopts the traditional process of intermittent sulfonation-alkali fusion-dilution-neutralization-acidification-press filtration-boiling-drying-distillation-slice packaging. The main problems: long and cumbersome process, high labor intensity, low degree of automation, unstable product quality; neutralization of SO produced by sulfonation 2 Gas acidification to produce crude β-naphthol, SO 2 Not only severely corrode equipment and pipelines, but also SO 2 The utilization rate of β-naphthol is low, and the pollution to the environment is relatively large; the crude product of β-naphthol is boiled with water after pressure filtration, ...

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Problems solved by technology

The main problems: the process is long and cumbersome, the labor intensity is high, the degree of automation is low, and the product quality is unstable; the use of sulfonation to neutralize the SO produced 2 Gas acidification to produce crude β-naphthol, SO 2 Not only severely corrode equipment and pipelines, but also SO 2 The utilization rate of β-naphthol is low, and the pollution to the environment is relatively large; the crude product of β-naphthol is boiled with water after pressure filtration, and the number of boiling is many (3-5 times), and the direct steam heating for boiling consumes high energy consumption and the product yield is low ; The boiling and filtering process directly affects the atmosphere and has a great impact on the environment; the amount of high-salt organic wastewater generated during the dilution-boiling process is very large (8-12t wastewater / tβ-naphthol), which has become a restriction for the β-naphthol industry The biggest environmental technical problem in production

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