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Production process of industrial high-quality naphthalene

A production method and high-quality technology, applied in the chemical industry, chemical instruments and methods, purification/separation of hydrocarbons, etc., can solve problems such as high labor intensity, intermittent operation, and large loss, and achieve low labor intensity, easy operation, and production small cycle effect

Inactive Publication Date: 2015-05-13
JIANGSU HUALUN CHEM
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Problems solved by technology

[0003] The invention discloses a production method of industrial high-quality naphthalene, which is used to solve the problems of high energy consumption, large loss, intermittent operation and high labor intensity in the traditional technology

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  • Production process of industrial high-quality naphthalene

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, the present invention is further described:

[0017] A kind of production method of industrial high-quality naphthalene of the present invention, comprises the steps:

[0018] 1)C 10 The raw material of heavy aromatics is pumped into the heat exchanger for preheating, and then enters multiple rectification towers for rectification. The distillate oil enters the reflux tank, and the naphthalene-rich solution with a content of more than 40% and a temperature of 210-220°C is extracted from the side line of the rectification tower;

[0019] 2) The high-temperature naphthalene-rich solution after rectification enters from the feeding trough of the double-barrel flaker, and the normal-temperature circulating water whose temperature is controlled at 0-35°C is passed through the double-barrel flaker. The temperature difference of the circulating water is large, and cold and heat exchange occurs, which speeds up the heat transfer...

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Abstract

The invention discloses a production process of industrial high-quality naphthalene and belongs to the field of processing of industrial naphthalene. The production process comprises the following steps: C10 heavy aromatics with the naphthalene content being more than 5% is adopted as a material, is preheated by a heat exchanger, and then enters a plurality of rectifying towers for rectifying so as to prepare rich-naphthalene solution; the rich-naphthalene solution enters a double-drum flaking machine, normal-temperature circulating water is introduced into the double-drum flaking machine, and heat-exchange crystallization is carried out by utilizing the temperature difference of cold and hot mediums to prepare flaky crystallized naphthalene; the crystallized naphthalene enters a discharging centrifugal machine, and by the relative movement of a rotary drum and a spiral part, centrifugation is carried out on the crystallized naphthalene to prepare the high-purity solid-phase industrial high-quality naphthalene. The production process disclosed by the invention has the advantages that the industrial high-quality naphthalene with the content being more than 90% is prepared by fewer production procedures and equipment, and the loss of the rich-naphthalene solution is less in the operation process, so that the energy utilization rate is high; mechanical production is adopted in the operation process, so that the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of industrial naphthalene processing, in particular to a production method of industrial high-quality naphthalene. Background technique [0002] Naphthalene is a very important raw material in the chemical industry. It is mainly obtained by further processing and separation of coal tar. It is an important product of tar processing. It can be divided into industrial naphthalene, refined naphthalene and methyl naphthalene. Naphthalene and naphthalene products are widely used In synthetic resin, paint, medicine, pesticide and other industries, it can be used to produce phthalic anhydride, menaphthylamine, plasticizer, diffusing agent and other products. Among them, according to the use of naphthalene, some industries can use industrial naphthalene instead of refined naphthalene. The raw material for producing industrial naphthalene is the naphthalene-rich fraction obtained from tar distillation or rectification, which is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/14C07C7/00C07C15/24
CPCY02P20/10
Inventor 周正彪丁胜王秋云
Owner JIANGSU HUALUN CHEM
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