High-efficiency separation method of caustic lye

A separation method and technology of caustic lye, applied in chemical instruments and methods, inorganic chemistry, alkali metal compounds, etc., can solve the problems of inconvenient transportation, unfavorable storage, low lye concentration, etc., to eliminate environmental and personal Potential safety hazards, full utilization of materials, and the effect of reducing moisture content

Active Publication Date: 2012-02-22
QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more mature process is to use a vacuum filter to filter and clean with water to recover as much sodium hydroxide (NaOH) as possible, which leads to low concentration of sodium hydroxide (NaOH) lye, and supplements caustic soda (solid hydrogen) Sodium oxide, the content is about 95%), and the method of increasing the concentration produces the inexhaustible total lye and discharges it, which not only causes waste, but also pollutes the environment, and forms a pressure on the wastewater treatment process
However, the evaporative dehydration method is used to increase the concentration of sodium hydroxide (NaOH) lye, and the moisture content of lime slag (mainly calcium carbonate CaCO3) is as high as 40-50%, which is not convenient for transportation or storage, and landfills pollute the environment

Method used

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  • High-efficiency separation method of caustic lye

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Lift the quicklime powder obtained after pretreatment into the causticization tank and carry out causticization reaction under the action of mechanical stirring; gradually discharge the material into a 1200mm centrifugal separator under stirring, and discharge the material at a low speed of 18m / s for 20 minutes. Separation at a high speed of 50m / s for 30 minutes, the water content of the unloaded lime slag is 5.3%, and there is no slippery feeling in the hand, which meets the conditions of safe landfill.

Embodiment 2

[0028] Lift the quicklime powder obtained after pretreatment into the causticization tank and carry out causticization reaction under the action of mechanical stirring; gradually discharge the material into a 1200mm centrifugal separator under stirring, and discharge it for 18 minutes at a low speed of 20m / s. Separation at a high speed of 55m / s for 25 minutes, the water content of the unloaded lime slag is 4.5%, and there is no slippery feeling in the hand, which meets the conditions of safe landfill.

Embodiment 3

[0030] Lift the quicklime powder obtained after the pretreatment into the causticization tank and carry out the causticization reaction under the action of mechanical agitation; gradually discharge the material into a 1200mm centrifugal separator under agitation, and discharge it for 15 minutes at a low speed of 25m / s. Separation at a high speed of 60m / s for 20 minutes, the water content of the unloaded lime residue is less than 5%, and there is no slippery feeling in the hand, which meets the conditions of safe landfill.

[0031] Features of the present invention:

[0032] 1. The moisture content of the calcium carbonate slag filtered by the prior art vacuum filter is greatly reduced, and the calcium carbonate slag can be safely landfilled, energy saving and emission reduction, and good environmental protection benefits.

[0033] 2. The present invention omits the process of heating, evaporating and concentrating, not only has a short technological process, but also is easy t...

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Abstract

The invention discloses a high-efficiency separation method for caustic lye, which comprises the following steps: A. pretreating the quicklime, crushing and screening to remove large stones and dregs to obtain quicklime powder; B. elevating the quicklime powder into the caustic The causticization reaction is carried out under the action of mechanical stirring in the chemical tank; C. After the causticization reaction is completed, the material is gradually fed into the centrifugal separation equipment under stirring, and separated at a low speed of 18-25m / s for 15-20min to promote the formation of the filter screen interface Material filter cake, stop feeding after the thickness of the filter cake reaches the specified value, and then separate at a high speed of 50-60m / s for 20-30min; D. The moisture content of lime residue after high-speed separation is controlled below 5%, reaching Landfill after safe landfill conditions. The invention solves the technical problems in the industry and eliminates the hidden dangers to the environment and personal safety. The separated lime slag can be calcined to produce lime and produce CO2 gas for industrial production, such as a gas source for sodium phenate decomposition. The invention is a practical technology for recycling resources and realizing clean production.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to an efficient separation method for caustic lye in industrial naphthalene production. Background technique [0002] In the coal tar deep processing industry in the field of coal chemistry, in order to achieve the maximum comprehensive profit, the mixed fraction is first dephenolized with lye sodium hydroxide and then deep processed to extract primary products such as phenol oil, naphthalene oil and washing oil fraction. After dephenolization, the phenol sodium salt must reduce the phenol, and the raffinate is sodium carbonate (Na 2 CO 3 ) and sodium bicarbonate (NaHCO 3 ), in order to realize the optimization of industrial production cost, the raffinate is converted into sodium hydroxide (NaOH) by using quicklime (CaO) as the raw material for dephenolization, so as to realize the recycling of raw materials, which is equivalent to using only cheap and easy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D1/28
Inventor 熊柱松罗国林
Owner QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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