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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

AI Technical Summary

Problems solved by technology

However, this method has problems such as cumbersome operating procedures, large product loss, high energy consumption, and large environmental pollution.

Method used

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  • Flaking molding method and apparatus for p-dihydroxy benzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0021] (1) the hydroquinone crude product that contains impurity produced in previous process is put in the hydroquinone rectifying tower 1, separates by rectification, with respect to the low boiler of hydroquinone and the high boiler respectively Discharge from the top and the bottom of the tower to obtain pure hydroquinone;

[0022] (2) The pure hydroquinone is extracted intermittently or continuously from the upper part of the hydroquinone rectification tower 1 to the pure hydroquinone liquid receiving tank 2 for collection and storage, and the receiving tank 2 is heated by a heat-conducting medium at the same time to keep The hydroquinone in the tank is in liquid state, and the tank is filled with inert gas to prevent the oxidation of hydroquinone;

[0023] (3) The liquid hydroquinone is sent into the flaking machine 3 from the receiving tank 2, and at the same ...

Embodiment 2

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

Embodiment 3

[0025] Example 3. In the step (1) of the method for forming hydroquinone flakes described in Example 1, the operating pressure of the hydroquinone rectifying tower 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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