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Circulated utilization method for acetylene cleaning liquor

A technology of acetylene purification and liquid circulation, applied in the direction of chemical change purification/separation, organic chemistry, etc., can solve the problems of resource waste, difficult treatment, water environment impact, etc., and achieve the effect of reducing waste water discharge, saving materials, and eliminating discharge

Active Publication Date: 2007-08-01
HANGZHOU ELECTROCHEM GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high content of COD, sulfur, phosphorus, acetylene and other impurities in this type of wastewater, direct discharge has a certain impact on the water environment, and it is difficult to treat. At the same time, the available chlorine in the waste sodium hypochlorite is not fully utilized, resulting in a waste of resources. The reuse of acetylene cleaning fluid has become a difficulty in the calcium carbide process PVC industry and needs to be solved

Method used

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  • Circulated utilization method for acetylene cleaning liquor

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Embodiment 1

[0011] During the generation of acetylene in PVC by calcium carbide method, since the raw material calcium carbide contains impurities such as sulfur and phosphorus, the produced acetylene also contains various interfering gases such as hydrogen sulfide and phosphine. Sodium hypochlorite is used as a cleaning solution to effectively oxidize and absorb the gas. The interfering gas cleans the acetylene gas so that the acetylene can be used in the next process. The cleaned waste sodium contains S 2- ,P 3- Plasma and cleaning fluid are recycled using the following process.

[0012] As shown in Figure 1, the process mainly achieves the recycling of cleaning liquid through the repeated configuration of sodium hypochlorite. After the waste sodium is cleaned once, the available chlorine content can no longer meet the cleaning requirements, so it is necessary to mix fresh sodium and waste sodium in a certain proportion.

[0013] After the waste sodium is cleaned once, the solution c...

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Abstract

The invention discloses a circulating reclaimed method of ethane cleaning liquid, which comprises the following steps: mixing sodium hypochlorite after primary cleaning from cleaning tower and mew-making sodium hypochlorite with pH at 6.0-10.0; adjusting; making pH of sodium hypochlorite after mixing at 6.0-10.0; controlling content of available chlorine at 0.0065%-0.01%; recycling into cleaning system; cleaning acetylene gas; controlling available chlorine of new-making sodium hypochlorite at 0.02%+_0.0002%.

Description

technical field [0001] The invention relates to an environmental protection and energy-saving technology, in particular to a method for recycling acetylene cleaning liquid in the link of cleaning the acetylene gas after the acetylene generator generates acetylene. Background technique [0002] In the acetylene generation process of calcium carbide method PVC, since the raw material calcium carbide contains impurities such as sulfur and phosphorus, the crude acetylene gas produced also contains various impurity gases such as hydrogen sulfide and phosphine, and these impurities will affect the synthesis of vinyl chloride in the subsequent process. Mercury chloride catalyst undergoes irreversible adsorption, destroying its "active center" and accelerating the decline of catalyst activity. Now the PVC industry generally uses sodium hypochlorite to clean crude acetylene gas. The cleaned sodium hypochlorite is directly discharged after a single use due to its purity and sulfur an...

Claims

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Application Information

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IPC IPC(8): C07C7/148C07C11/24
Inventor 胡永强孔万力孙熊杰沈文良余建芳陈浙许荣芝许群立
Owner HANGZHOU ELECTROCHEM GROUP