Purifying agent for removing fluorine and chlorine in calcium carbide furnace tail gas and its preparation method and application

A technology of calcium carbide furnace tail gas and purification agent, which is applied in the direction of chemical instruments and methods, carbon monoxide, and other chemical processes. It can solve the problems of complex process, large environmental impact, and poor purification effect, and achieve a wide distribution of pore sizes and meet resource utilization. , good absorption effect

Active Publication Date: 2016-02-10
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a simple and efficient cleaning agent for effectively removing fluoride and chloride in the tail gas of calcium carbide furnace, so as to overcome the poor purification effect of the existing removal method or the complex process and the generation of secondary pollutants in the purification process. Sub-pollution and defects that have a great impact on the environment

Method used

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  • Purifying agent for removing fluorine and chlorine in calcium carbide furnace tail gas and its preparation method and application
  • Purifying agent for removing fluorine and chlorine in calcium carbide furnace tail gas and its preparation method and application
  • Purifying agent for removing fluorine and chlorine in calcium carbide furnace tail gas and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 prepares cleaning agent I

[0027] (1) Weigh 600 grams of sodium silicate (SiO 2 content 27.1wt%) was dissolved in 2400 ml of deionized water, and 570 g of sodium aluminate (Al 2 o 3 Content 19.3wt%), make SiO in this reaction raw material 2 / Al 2 o 3 The molar ratio is 2.5:1, the obtained gel is stirred for 1 hour, then moved to a 1 liter stainless steel crystallizer, left to age for 2 hours to 4 hours, the temperature of the water bath is raised to 58°C, and the temperature of the water bath is raised to 90°C after crystallization for 30 hours, crystallization 8 hours to complete the reaction. After filtering, the solids were washed three times with 600 ml of deionized water, and dried at 95° C. to obtain A-X intergrowth combined zeolite powder.

[0028] X-ray diffraction analysis (XRD analysis) showed that the combined zeolite contained 35% A-type zeolite and 64% X-type zeolite, and the Si / Al molar ratio was 1.05:1.

[0029] (2) Weigh 60 grams of ...

Embodiment 2

[0030] Embodiment 2 The effect comparative example of three kinds of purifiers

[0031] Utilizing the preparation method of Example 1, using commercially available A-type zeolite instead of the A-X combined zeolite powder obtained in step (1), to prepare Purifier II, using commercially available low-silicon X-type zeolite (Si / Al atomic ratio 1.03) Purifier III is prepared by replacing the A-X combined zeolite powder obtained in step (1).

[0032] The three kinds of purifiers were installed in the fixed adsorption bed respectively, and their removal effects on fluorine and chloride impurities were investigated.

[0033] Table 1 Feed gas composition

[0034]

[0035] Operating conditions: DN25 reaction tube, superficial linear velocity: 0.05m / s, residence time: 20s, operating temperature: 30°C, operating pressure: 0.5MPa. Purification results are shown in Table 2, Table 3, and Table 4 respectively.

[0036] Table 2 Purifying agent I is to the absorption result of fluorine, ...

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Abstract

The invention discloses a cleaning agent for removing fluorine and chlorine in calcium carbide furnace exhaust. The cleaning agent is prepared by the processes of taking A-X combined zeolite as a carrier and loading an active metal component for removing fluorine and chlorine by a kneading method. Compared with the prior art, the cleaning agent disclosed by the invention takes metals such as silver, cerium, nickel and cobalt as active components, and takes the A-X combined zeolite as the carrier, so that the aperture of an adsorption layer of the cleaning agent is wider in distribution, and the cleaning agent has a good absorption effect on fluorides and chlorides with different apertures. The cleaning agent disclosed by the invention is efficient and fast; effective removal of heavily contaminated materials such the fluorides and the chlorides in the calcium carbide furnace exhaust can be simultaneously achieved at normal temperature; the fluorine content and chlorine content in the cleaned exhaust are smaller than or equal to 0.1 mg / Nm<3>; the resource utilization of carbon monoxide can be completely met.

Description

technical field [0001] The invention relates to a purifying agent for purifying calcium carbide furnace tail gas, in particular to a purifying agent for removing fluorine and chlorine in calcium carbide furnace tail gas, a preparation method and application thereof. Background technique [0002] Calcium carbide is an important basic raw material in the organic synthesis industry. Polyvinyl chloride, neoprene rubber, polyvinyl alcohol, acetylene carbon black, trichloroethylene, etc. can be produced from calcium carbide acetylene. It is also used as a desulfurizer for steel and metals. Cutting and welding gases. The polyvinyl chloride (PVC) industry is the main consumption field of calcium carbide in China, accounting for about 75% of the consumption of calcium carbide. my country is the world's largest producer of calcium carbide, with more than 450 calcium carbide production enterprises. In 2010, the production capacity of calcium carbide was 22 million tons, and the output...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/30C01B31/18C01B32/40
Inventor 张华西陈晓华陈耀壮
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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