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Method for reducing chlorine ion content in circulating water in chlor-alkali chemical industry

A technology of chlorine ion content and chlor-alkali chemical industry, which is applied in chemical instruments and methods, water pollutants, natural water treatment, etc., can solve problems such as lack of solutions, achieve good chlorine removal effect, simple operation, and small environmental pollution.

Pending Publication Date: 2022-04-29
SHANDONG LUTAI HLDG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still a lack of corresponding solutions for the above situation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First add a certain amount of calcium carbide slag to the supernatant of high chlorine circulating water, then add sodium hydroxide to aluminum hydroxide (molar ratio NaOH:Al(OH) 3 =1:1) in a supersaturated solution, stir until the aluminum hydroxide solid disappears, and then add this mixture to the high chlorine circulating water supernatant containing carbide slag in the chlor-alkali chemical industry, so that the Ca of the system 2+ 、Al 3+ , Cl - The molar ratio is 5:3:1. After stirring for 30 minutes and settling, the supernatant can be obtained as circulating water with reduced chloride ion content.

Embodiment 2

[0022] First add a certain amount of calcium carbide slag to the supernatant of high chlorine circulating water, then add sodium hydroxide to aluminum hydroxide (molar ratio NaOH:Al(OH) 3 =1:1) in a supersaturated solution, stir until the aluminum hydroxide solid disappears, and then add this mixture to the high chlorine circulating water supernatant containing carbide slag in the chlor-alkali chemical industry, so that Ca 2+ 、Al 3+ , Cl - The molar ratio is 5:2:1. After stirring for 40 minutes and settling, the supernatant can be obtained as circulating water with reduced chloride ion content.

Embodiment 3

[0024] First add a certain amount of calcium carbide slag to the supernatant of high chlorine circulating water, then add sodium hydroxide to aluminum hydroxide (molar ratio NaOH:Al(OH) 3 =1:1) in a supersaturated solution, stir until the aluminum hydroxide solid disappears, and then add this mixture to the high chlorine circulating water supernatant containing carbide slag in the chlor-alkali chemical industry, so that Ca 2+ 、Al 3+ , Cl - The molar ratio is 5:3:2. After stirring for 30 minutes, the supernatant can be obtained after settling, which is circulating water with reduced chloride ion content.

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PUM

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Abstract

The invention discloses a method for reducing the content of chloride ions in circulating water in the chlor-alkali chemical industry. The method comprises the following steps: adding a certain amount of carbide slag into high-chlorine circulating water supernatant; the method comprises the following steps: adding sodium hydroxide into a supersaturated solution of aluminum hydroxide (the molar ratio of NaOH to Al (OH) 3 is 1: 1), and stirring until an aluminum hydroxide solid disappears; and adding the mixture into the high-chlorine circulating water supernatant containing carbide slag in the chlor-alkali chemical industry, stirring for 30-60 minutes, and settling to obtain the circulating water with the chloride ion content reduced as the supernatant. The method is simple to operate and good in dechlorination effect, the used agents are aluminum hydroxide and sodium hydroxide, and the raw materials are cheap and easy to obtain; and the method has little pollution to the environment and is suitable for realizing industrialization.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for reducing the content of chloride ions in circulating water in the chlor-alkali chemical industry. Background technique [0002] Existing PVC production mainly has two kinds of preparation techniques, one is the calcium carbide method, the other is the ethylene method, due to the domestic conditions of rich coal, poor oil, and little gas, my country mainly uses the calcium carbide method as the main production process; the calcium carbide method is Using calcium carbide (CaC 2 ), when it meets water to generate acetylene, synthesize acetylene and hydrogen chloride to produce vinyl chloride monomer, and then make vinyl chloride produce polyvinyl chloride through polymerization reaction. However, the pollution of the calcium carbide method is relatively serious. On average, for every ton of PVC produced, 20 kg of calcium carbide dust, 14 tons of calcium carbide slag wit...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F103/38C02F101/12
CPCC02F1/5236C02F2103/38C02F2101/12
Inventor 裴彦鹏苏璇李合军魏忠勋康甲
Owner SHANDONG LUTAI HLDG GRP CO LTD
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