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Method for treating filter cake filter-press filtrate in polyolefin catalyst production

A polyolefin catalyst and treatment method technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Easy to block, reduce pollution, solve the effect of fast flux decay rate

Active Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is basically difficult to implement conventional reverse osmosis and biochemical methods, and it is even more difficult to meet the recycling standard

Method used

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  • Method for treating filter cake filter-press filtrate in polyolefin catalyst production
  • Method for treating filter cake filter-press filtrate in polyolefin catalyst production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The main water quality characteristics of the filter cake press filtrate according to the present invention are: wastewater pH 3.35, conductance 235mS / cm, COD Cr About 4070mg / L, TOC 859mg / L, BOD 5 2110mg / L, TDS 239012mg / L, Ca 2+ 59mg / L, Mg 2+ 1027mg / L, Na + 93837mg / L, Cl - 162018mg / L, the organic matter is mainly a small amount of benzene series such as toluene. Processing flow such as figure 1 shown.

[0061] Step 1 uses submerged microfiltration to remove turbidity and suspended solids in wastewater, and the submerged microfiltration unit uses an external pressure polyvinylidene fluoride hollow fiber curtain membrane module. The operating conditions are: wastewater pH 3.35, wastewater temperature about 20°C, operating pressure about -0.02MPa. Under these operating conditions, the permeation flux of the microfiltration membrane is 50-100L / m 2 h, the turbidity of the product water is lower than 0.2NTU;

[0062] Step 2 Heat the microfiltration product water to ...

Embodiment 2

[0066] The main water quality characteristics of the filtrate after filter cake press filtration are the same as in Example 1.

[0067] Step 1 uses submerged microfiltration to remove turbidity and suspended solids in wastewater, and the submerged microfiltration unit uses an external pressure polyvinylidene fluoride hollow fiber curtain membrane module. The operating conditions are: wastewater pH 3.35, wastewater temperature about 20°C, operating pressure about -0.02MPa. Under these operating conditions, the permeation flux of the microfiltration membrane is 50-100L / m 2 h, the turbidity of the product water is lower than 0.2NTU;

[0068] Step 2 Heat the microfiltration product water to a specific temperature and then pump it into the membrane distillation system to concentrate. The membrane distillation unit adopts polyvinylidene fluoride hollow fiber membrane modules, and the membrane distillation type adopts internal pressure vacuum membrane distillation, that is, the shel...

Embodiment 3

[0072] The main water quality characteristics of the filtrate after filter cake press filtration are the same as in Example 1.

[0073] Step 1 uses submerged microfiltration to remove turbidity and suspended solids in wastewater, and the submerged microfiltration unit uses an external pressure polyvinylidene fluoride hollow fiber curtain membrane module. The operating conditions are: wastewater pH 3.35, wastewater temperature about 20°C, operating pressure about -0.02MPa. Under these operating conditions, the permeation flux of the microfiltration membrane is 50-100L / m 2 h, the turbidity of the product water is lower than 0.2NTU;

[0074] Step 2 Heat the microfiltration product water to a specific temperature and then pump it into the membrane distillation system for concentration. The membrane distillation unit adopts PTFE plate and frame membrane modules, and the membrane distillation type adopts vacuum membrane distillation, that is, the permeation side of the membrane mod...

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Abstract

The invention relates to the field of industrial wastewater treatment, in particular to a method for treating filter cake filter-press filtrate in polyolefin catalyst production. Process flows of microfiltration, membrane distillation and cooling crystallization are adopted in the method. By utilizing the process flows, a mass of salinity, TDS (Total Dissolved Solids) and COD (Chemical Oxygen Demand) are effectively separated and removed to ensure that the advanced treatment and recycling of the filter cake filter-press filtrate are realized. In the process flows, the technical advantages of the membrane distillation are fully utilized, the problem of discharging the filter cake filter-press filtrate is solved and the recycling of product water is realized. After the filter cake filter-press filtrate is subjected to process flow treatment, the wastewater recovery rate is up to 30-60%; the partial recycling of the filter cake filter-press filtrate is realized; the development strategy of energy saving and emission reduction of enterprises is achieved; and remarkable social benefit and economic benefit are provided.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a method for treating filter cake press filtrate in polyolefin catalyst production. In particular, it refers to the advanced treatment and reuse method of the filter cake press filtrate produced in the production process of olefin polymerization catalyst by using membrane separation technology. Background technique [0002] How to effectively treat the waste liquid generated in the production process of polyolefin catalyst is an environmental protection problem. Due to the influence of its physical properties and components, there has been no effective treatment method. At present, the treatment methods such as burning bricks are still mainly transported abroad, and the volume and cost of foreign transport are increasing year by year. As the country's environmental protection requirements become more and more stringent, the waste liquid has reached a critical point ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
Inventor 张新妙杨永强王玉杰奚振宇侯秀华
Owner CHINA PETROLEUM & CHEM CORP
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