Method for recovering naphthalene from sulfonated tail gas

A naphthalene recovery and tail gas technology, which is applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of difficult recovery of sulfonated tail gas, high labor intensity and harsh environment, and achieves reduction of manual work intensity and automation. The effect of high degree and improvement of recycling quality

Inactive Publication Date: 2019-07-12
山西豪仑科化工有限公司
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Problems solved by technology

[0004] The present invention overcomes the deficiencies in the prior art, provides a high degree of automation and a continuous process for recovering naphthalene from sulfonated tail gas, and solves the problems that the traditional recovery method is not easy to recover sulfonated tail gas, and the labor intensity is high and the environment is bad.

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  • Method for recovering naphthalene from sulfonated tail gas
  • Method for recovering naphthalene from sulfonated tail gas

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Embodiment Construction

[0018] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail with reference to the embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. The technical solutions of the present invention will be described in detail below in conjunction with the embodiments and drawings, but the protection scope is not limited by this.

[0019] Such as figure 1 Shown is a sulfonated tail gas naphthalene recovery device, including tail gas condenser 1, tail gas trap 2, phase separation tower 3, induced draft fan 4, liquid naphthalene storage tank 5 and sodium sulfite storage tank 6, tail gas condenser 1 The lower liquid outlet is connected with the phase separation tower 3, the lower liquid outlet of the phase separation tower 3 is conn...

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Abstract

The invention relates to the technical field of 2-naphthol production, discloses a method for recovering naphthalene from sulfonated tail gas, and solves the problems of difficult recovery of sulfonated tail gas, high labor intensity and bad environment. The sulfonated tail gas enters a tail gas condenser, 50-60 DEG C hot water is introduced into a condensing pipe to cool the sulfonated tail gas,and the upper part is sprayed with a sodium sulfite solution to obtain a spraying solution; the spray liquid is led to a phase separation tower for phase separation, and then divided into two phases through density difference, wherein the upper layer is liquid naphthalene, and the lower layer is a sodium sulfite solution. According to the invention, the sodium sulfite solution is used as sprayingwater to neutralize dilute sulfuric acid carried in the tail gas, so that equipment is prevented from being corroded; the 50-60 DEG C hot water is used as cooling water, so that naphthalene solidification can be effectively avoided, and pipeline blockage can be avoided; and by using the phase separation tower, phase separation can be continuously realized, system equipment is simplified, and the recovery quality of refined naphthalene is improved.

Description

Technical field [0001] The invention relates to the technical field of dinaphthol production, in particular to a method for recovering naphthalene from sulfonated tail gas. Background technique [0002] The traditional production of dinaphthol is mainly composed of sulfonation, hydrolysis, naphthalene blowing, neutralization, cooling, filtration, alkali melting, dilution, acidification, boiling, drying, distillation and other units. In the process of sulfonation, refined naphthalene and sulfuric acid The reaction is a reversible reaction. The tail gas contains unreacted naphthalene, water vapor, and a very small amount of sulfuric acid. The crystallization point of naphthalene is 80°C. If the temperature is too low, it is easy to solidify and block the pipeline. Dilute sulfuric acid is very corrosive and is used for naphthalene recovery. Brings great challenges. [0003] The traditional process adopts the sodium naphthalene sulfonate filtrate wastewater cooling spray method to rec...

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Application Information

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IPC IPC(8): C07C7/00C07C7/11C07C15/24
CPCC07C7/005C07C7/11C07C15/24
Inventor 韩喜民黄泽鹏李斌革
Owner 山西豪仑科化工有限公司
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