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Method for preparing nano-catalytic wet oxidation catalyst

A wet oxidation and nano-catalysis technology, applied in the oxidation water/sewage treatment and other directions, can solve the problems of harsh reaction conditions, loss of catalyst active components, high cost, and achieve mild treatment conditions, low treatment costs, and high catalytic efficiency.

Inactive Publication Date: 2015-04-29
TIANJIN YIBIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalytic wet oxidation method does not need to consider the toxicity of acrylic acid and its ester emulsion wastewater, so it has more application prospects; the main problem existing in the existing catalytic wet oxidation technology: the reaction conditions are relatively harsh, the general temperature is 150°C-300°C, the pressure is 0.5- 20MPa, the treatment cost and safety are relatively high; the active components of the catalyst are lost. Since the catalyst is used for a long time under certain temperature, pressure and hydrothermal conditions, the catalyst must have sufficient strength and be able to resist acid and alkali corrosion , noble metal oxide catalysts have good performance, but the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] A method for preparing a nano-catalytic wet oxidation catalyst is characterized by comprising the following steps:

[0016] (1) A mixed solution containing at least one of the divalent metal cations copper, magnesium, and zinc and at least one of the multivalent metal ions aluminum, iron, cerium, and lanthanum is co-currently co-currently used with the sodium hydroxide and sodium carbonate solution. Precipitation to obtain nanoscale hydrotalcite-like materials, the reaction temperature of co-current is controlled to 60℃-80℃, the precipitation pH value is controlled to 8-10, the precipitation time is controlled to 1.5-2.5h, the aging control time is 40-60min, the product passes through Filter, wash, and dry to obtain a white powder with nano-scale crystal grains, in which the molar ratio of divalent metal ions to polyvalent metal ions is 3-5, and the molar ratio is NaOH / NaOH+Na 2 CO 3 0.7-0.9;

[0017] (2) The white powder obtained above is mixed into a binder and a pore expa...

Embodiment 1

[0022] Example 1: 1950 grams of industrial magnesium nitrate, 480 grams of industrial aluminum nitrate, dissolved in deionized water to a specific gravity of 1.126; 530 grams of sodium hydroxide and 375 grams of sodium carbonate, dissolved in deionized water to a specific gravity of 1.151. Under stirring conditions, the two solutions are co-currently neutralized at a flow rate of 4L / min. The temperature of the precipitation solution is 60°C, the pH is adjusted to 8.4, the precipitation is completed and aged for 60 minutes, and the product is filtered, washed, and dried to obtain crystal particles. It is a white powder of 50nm. Take 100 g of the white powder, mix in 5 g of kaolin, 10 g of pseudo-boehmite and 1 g of sesame powder, add a 3% mass fraction of nitric acid solution to make a spherical carrier with a diameter of 2 mm. The shaped carrier is calcined at 400℃ for 2 hours, the measured strength is 50N / cm, and the specific surface is 140m 2 / g, the pore volume is 0.65cc / g. ...

Embodiment 2

[0023] Example 2: Using industrial copper nitrate to replace magnesium nitrate, the other processes are the same as above. Take 100g of powder, mix with 10g of kaolin, 3g of silica sol and 2g of sesame powder, and add 2% nitric acid solution to make a spherical carrier with a diameter of 1mm. The shaped support is calcined at 500℃ for 2 hours, the measured strength is 40N / cm, and the specific surface is 223m 2 / g, the pore volume is 1.3cc / g. At a temperature of 200°C and normal pressure, the removal rate of COD for high-concentration acrylic acid wastewater with a COD of 20000 ppm is 85%.

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for preparing a nano-catalytic wet oxidation catalyst. The catalyst is prepared by the following steps: co-precipitating a mixed solution containing at least one of bivalent metallic cationic copper, magnesium and zinc and at least one of polyvalent metal ionic aluminum, iron and cobalt with sodium hydroxide and sodium carbonate solution by adopting a parallel flow method to form a nano-type hydrotalcite material; then, mixing the nano-type hydrotalcite material with adhesive and a pore expanding agent by virtue of pulping to prepare a cylindrical, clover-shaped or spherical carrier; and calcining for 2-5 hours at 300-500 DEG C for molding. According to the nano-catalytic wet oxidation catalyst, the strength is 30-100N / cm, the specific surface is 100-300m<2> / g, the pore volume is 0.6-1.6cc / g, and the COD removal rate for high-concentration acrylic acid wastewater at normal pressure and temperature of 100-200 DEG C is over 60 percent.

Description

Technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a preparation method of a nano-catalytic wet oxidation catalyst. Background technique [0002] Acrylic emulsion production wastewater has a uniform paste-like appearance, COD is as high as 35000mg / L, and B / C ratio is only 0.01. The discharge treatment of this wastewater is a major technical problem facing China. In recent years, my country's acrylic acid and its esters industry has developed rapidly. In 2000, the total output of acrylic acid and its esters was less than 300,000 tons, but by 2010 it had exceeded the 1 million tons mark. The current total output is about 1.2 million tons. And for every 1t of acrylic acid and its ester products, about 1.2t of waste water is produced, that is, about 1.4 million tons of domestic olefinic acid and ester waste water are produced every year in my country. The COD of acrylic acid and its ester wastewater is about 30-8...

Claims

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Application Information

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IPC IPC(8): B01J23/04B01J23/78B01J23/06B01J23/10C02F1/72
Inventor 刘楹
Owner TIANJIN YIBIN TECH CO LTD