Alkali liquor and organic gas recovery device in calcium carbide method PVC (polyvinyl chloride) production

By designing the alkali and organic gas recovery devices in the production of calcium carbide PVC, and using an online oxygen analyzer to detect and cut off the recycling system, the system fluctuations and explosion risks caused by waste alkali emission are solved, and the safe and stable operation of the recycling system is achieved.

CN222631361UActive Publication Date: 2025-03-18XINJIANG ZHONGTAI CHEM TOKSUN ENERGY & CHEM CO LTD +1
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Patent Information

Application Number
CN202420398143.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-03-01
Publication Date
2025-03-18
Estimated Expiration
2034-03-01

AI Technical Summary

Technical Problem

In the existing process of producing PVC by calcium carbide, the waste alkali liquid causes system fluctuations during the discharge process of dissolved VCM and acetylene gas during recycling and effective use, leakage occurs in the vacuum pump inlet, and the atmosphere enters the production system, causing the oxygen content to exceed the standard, forming an explosive mixture, and there is a risk of explosion and ignition.

Method used

A recovery device for alkali liquid and organic gas in PVC production of calcium carbide method was designed. The in-line oxygen analyzer installed on the vacuum pump was interlocked with the recovery gas buffer tank. When the oxygen content exceeds the standard, the discharge valve was opened to ensure the stability and safety of the recovery system.

Benefits of technology

It effectively solves the problems of oxygen content exceeding the standard and explosion risk in the recycling system, ensuring the safe and stable operation of the recycling system.

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Abstract

The utility model relates to an alkali liquor and organic gas recovery device in calcium carbide method polyvinyl chloride (PVC) production, which comprises a recovery gas buffer tank, a vacuum pump, an on-line oxygen analyzer, a cooler, a stripping tower, a distillation still and a waste alkali buffer tank, a first outlet pipeline of the vacuum pump is communicated with the recovery gas buffer tank, and a first inlet pipeline of the vacuum pump is communicated with the cooler. A first inlet pipeline is communicated with an emptying pipeline of the recovered gas buffer tank, a first outlet pipeline of the vacuum pump is provided with an online oxygen analyzer, a top exhaust pipeline of the stripping tower is communicated with the vacuum pump, the bottom of the stripping tower is provided with a distillation kettle, and a second outlet pipeline of the distillation kettle is communicated with a waste alkali buffer tank. Through the structure, the problems that in an existing technological process for producing PVC through a calcium carbide method, in the discharging process of waste alkali liquid, dissolved VCM and acetylene gas generate system fluctuation during recovery and effective utilization, a vacuum pump inlet leaks, atmosphere enters a production system, the oxygen content exceeds the standard, an explosive mixture is formed, and the risk of explosion ignition exists are solved.
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