Flaking molding method and apparatus for p-dihydroxy benzene

A technology of hydroquinone flaking and quinone flaking, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as cumbersome operating procedures, high energy consumption, and large environmental pollution. Achieve the effects of simple operation procedures, low environmental pollution and low energy consumption

Inactive Publication Date: 2008-12-17
JIANGSU SANJILI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has problems such as cumbersome operating procedures, la

Method used

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  • Flaking molding method and apparatus for p-dihydroxy benzene

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Example Embodiment

[0020] Example 1. Reference figure 1 . A hydroquinone sheet forming method, the steps are as follows:

[0021] (1) Put the crude hydroquinone containing impurities produced in the previous process into the hydroquinone rectification tower 1, and separate the low-boiling and high-boiling substances relative to hydroquinone by distillation. Discharge from the top and bottom of the tower to obtain pure hydroquinone;

[0022] (2) The pure hydroquinone is produced intermittently or continuously from the upper part of the hydroquinone rectification tower 1 to the pure hydroquinone liquid transfer tank 2 for collection and storage, and at the same time, the transfer tank 2 is heated by the heat transfer medium to maintain The hydroquinone in the tank is liquid, and the tank is filled with inert gas to prevent the hydroquinone from oxidizing;

[0023] (3) Send the liquid hydroquinone from the transfer tank 2 to the flake forming machine 3, and at the same time pass a cooling medium into t...

Example Embodiment

[0024] Example 2. In step (1) of the hydroquinone sheet forming method described in Example 1, the operating pressure of the hydroquinone rectification column 1 during rectification and separation is 1 kPa.

Example Embodiment

[0025] Example 3. In step (1) of the hydroquinone sheet forming method described in Example 1, the operating pressure of the hydroquinone rectification column 1 during rectification and separation is 50 kPa.

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Abstract

The invention discloses a molding method of hydroquinone flake, which is characterized in that hydroquinone crude product containing impurity produced in the prior procedure is put into a rectification tower of hydroquinone and hydroquinone pure product is gained through rectification and separation; the hydroquinone pure product is retrieved and put into a liquid tank of the hydroquinone pure product for collection and storage, and at the same time, heat-conducting medium of the tank is heated to keep the hydroquinone in the tank in a liquid state; liquid hydroquinone is sent into a flaker from the tank, cooling medium is injected into a revolving drum of the flaker for cooling at the same time, and after the liquid hydroquinone is condensed into flaky solid on the surface of the revolving drum, the flake is shed by a scrapper clinging to the revolving drum, and hydroquinone product is obtained. The invention also discloses a molding device of the hydroquinone flake. The method and the device of the invention have advantages of simple operating procedure, shortened time of hydroquinone staying in the device, effective reduction of oxidation loss of materials, no need of such auxiliary materials as consuming solvent, adsorbent, etc., reduction of production cost, low consumption of energy and low environment pollution.

Description

technical field [0001] The invention relates to a hydroquinone post-treatment process, in particular to a hydroquinone sheet forming method; the invention also relates to a hydroquinone sheet forming device. Background technique [0002] At present, the molding method commonly used in the hydroquinone production industry is the crystallization molding method. Its main process is: the crude hydroquinone containing certain impurities produced in the previous production process is mixed with solvents, additives, and adsorption in a certain proportion. Add any one, two or all of the agents into the decolorization kettle for mixing, control a certain temperature, stir and mix under the protection of inert gas, and carry out processes such as crude product dissolution and impurity adsorption. Afterwards, the mixture is passed through a filter to remove solid impurities and enters a crystallization tank. In the crystallization tank, crystallization is carried out by lowering the te...

Claims

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Application Information

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IPC IPC(8): C07C39/08C07C37/70
Inventor 刘德标杨永胜王恒启戴春江
Owner JIANGSU SANJILI CHEM
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