Treatment method of brine waste in production process of toluene-2,4-diisocyanate (TDI)

A salt-containing wastewater, production process technology, applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Achieve the effect of optimizing the industrial structure, solving the emission problem and reducing the cost

Active Publication Date: 2013-04-24
甘肃北方三泰化工有限公司
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Problems solved by technology

Ozone has a strong oxidizing ability, which can oxidize inorganic substances in water and reduce COD content. This is an ideal treatment method, but its disadvantages are also obvious. The treatment cost is very high, which makes this method greatly economical. reduced, leading to the failure of this method to be widely promoted

Method used

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  • Treatment method of brine waste in production process of toluene-2,4-diisocyanate (TDI)
  • Treatment method of brine waste in production process of toluene-2,4-diisocyanate (TDI)
  • Treatment method of brine waste in production process of toluene-2,4-diisocyanate (TDI)

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Embodiment 1

[0018] Example 1: see figure 2 , a kind of treatment method of saline waste water in TDI production process, it is characterized in that comprising the steps:

[0019] a. Neutralize the saline waste water produced in the production process of toluene diisocyanate with 12% hydrochloric acid through a pipeline mixer, adjust the pH value of the solution to 5-6, and remove carbonate;

[0020] b. Pass the waste water through the fiber bed coalescer, coalesce the small oil droplets, and lead to the static separator for separation, the residence time is 120min;

[0021] c, the water phase in the lower part of the static separator is mixed with sodium hypochlorite to react, and the reaction time is 20min;

[0022] d. Pass the oxidized waste brine through a metal filter, the filter material is 316L, and the filter element is polypropylene. After passing through the activated carbon adsorption tower, it enters the electrolysis plant salt process, and then enters the electrolysis proce...

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Abstract

The invention relates to a treatment method of brine waste in a production process of toluene-2,4-diisocyanate (TDI). The treatment method comprises the following steps of a, carrying out acid neutralization on the brine waste by hydrochloric acid or hydrogen chloride, removing carbonate and generating decarbonized silicate saline water; b, filtering the decarbonized silicate saline water through a coalesce or a tilted plate separator to separate micro oil drops in water; c, mixing the processed brine waste with sodium hypochlorite to oxidize and remove organic pollutant; d, filtering the oxidized waste water, and removing a trace of organic matter by active carbon, and then entering an electrolysis process. By adopting the treatment method, the brine waste generated in production of toluene diisocynate by a phosgene method is cyclically used in production after being processed; cyclic utilization of the entire production process is finished; zero discharge standard of the waste water is achieved; significant economic benefit is brought about, and harmonious sustainable development of economics and environmental protection is also achieved.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, in particular to a treatment method for saline waste water in the production process of TDI produced by phosgene method. Background technique [0002] Toluene diisocyanate (TDI) is the main raw material of polyurethane (PU), which is widely used in the production of polyurethane foam, plastics, coatings, elastomers and adhesives. Its production process has been made public. It is described in Chinese invention patents, such as patents CN200710106678.8, CN1149579A and CN201010115308.2, etc. In the production of toluene diisocyanate by phosgene method, the excess phosgene is destroyed by lye, and the discharged waste liquid contains 1-3% sodium chloride, 5-10% sodium carbonate and 1-5% hydrogen The waste brine of inorganic substances such as sodium oxide inevitably contains various organic impurities. Waste brine biological oxygen demand (BOD 5 ) is 2-5mg / L, and the total orga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/36
Inventor 李小利毛志红付振波李春欣任若飞陈文强
Owner 甘肃北方三泰化工有限公司
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