Acetylene sodium hypochlorite cleaning waste liquid circulating zero-discharge system for a PVC production process

A technology of acetylene sodium hypochlorite and sodium hypochlorite, which is applied in filtration treatment, hydrocarbon purification/separation, multi-stage water treatment, etc. It can solve the problems of cleaning tower scaling, calcium salt enrichment, high-salt wastewater discharge, etc., and achieve the goal of solving scaling problems, reduction in salinity, and the effect of saving reused water

CN110845063AInactive Publication Date: 2020-02-28QINGHAI YIHUA CHEM
6 Cites 1 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-02-28
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses an acetylene sodium hypochlorite cleaning waste liquid circulating zero-discharge system for a PVC production process. The system comprises a cleaning tower system, a dilute sodium hypochlorite preparation system, a waste sodium hypochlorite water purification system, a triple-effect evaporation desalting device and the like, wherein the cleaning tower system comprises an empty tower, a cooler, a water washing tower, a cleaning tower I, a cleaning tower II and a neutralizing tower, the empty tower, the cooler, the water washing tower, the cleaning tower I, the cleaningtower II and the neutralizing tower are sequentially connected, the dilute sodium hypochlorite preparation system comprises a hydrochloric acid storage tank, a storage tank I, a high-position tank anda storage tank II, the storage tank I, the high-position tank and the storage tank II are sequentially connected, the waste sodium hypochlorite water purification system comprises a water collectingpool, a stripping tower, a quartz sand filter, a ceramic filter, a clear water pool, an ultrafiltration device and a reverse osmosis device, and the water collecting pool, the stripping tower, the quartz sand filter, the ceramic filter, the clear water pool, the ultrafiltration device and the reverse osmosis device are sequentially connected. According to the invention, with the system, the problems of poor cleaning effect, scaling of the clean tower, calcium salt enriching, high waste sodium hypochlorite content, high-salinity wastewater discharge and the like in the prior art are solved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of chemical equipment, in particular to an acetylene sodium hypochlorite cleaning waste liquid circulation zero discharge system used in the PVC production process. Background technique

[0002] There are two cleaning processes for acetylene gas in the production of PVC by the calcium carbide method, sulfuric acid cleaning and sodium hypochlorite cleaning. Sodium hypochlorite is used for purification, and there is a large amount of salty and phosphorus-containing wastewater that needs to be treated. If the waste sodium hypochlorite is recycled, a large amount of salts will be enriched, and phosphate, carbonate and calcium salt will form precipitates, which will be precipitated on the clean packing, affecting the cleaning effect and causing the system to stop for processing and precipitation; at the same time, the organic matter in the waste sodium hypochlorite will be enriched, Affect the cleaning effect, ca...

Examples

Embodiment Construction

[0030] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0031] A kind of acetylene sodium hypochlorite clean waste liquid circulation zero discharge system used in PVC production process of the present invention mainly comprises such as figure 1 The clean tower system shown and as figure 2 Shown dilute sodium hypochlorite preparation system and waste sodium hypochlorite water purification system, further, also can include such as image 3 The three-effect evaporative desalination device shown. Among them, the cleaning principle is to use the strong oxidation properties of sodium hypochlorite to oxidize impurities such as hydrogen sulfide and phosphine in acetylene into acidic substances and remove them. The reaction formula is as follows:

[0032] 4NaClO+H2S→H2SO4+4NaCl

[0033] 4NaClO+PH3→H3PO4+4NaCl

[0034] 4NaClO+AsH3→H3AsO4+4NaCl

[0035] The neutralization operation is to spray the cleane...