CN102019192B - Process method for oil-free cerium carbonate serving as cleaning catalyst for automobile tail gas - Google Patents
Process method for oil-free cerium carbonate serving as cleaning catalyst for automobile tail gas Download PDFInfo
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Abstract
The invention relates to a process method for oil-free cerium carbonate serving as a cleaning catalyst for automobile tail gas which comprises the following steps of: infiltrating cerium chloride solution separated from an extraction groove and dissolved ammonium hydrogen carbonate solution into a high-level tank respectively, and controlling the flow rate to be between 5 and 8 m<3>/s; allowing the solution to flow into a chemical fiber filter column through the high-level tank, wherein the column-packing quantity of fibers is between 70 and 80 percent, and the column volume is phi 500*2,000; allowing the filtered solution to flow into a receiving tank respectively, and infiltrating the solution into the high-level tank for later use; adding the cerium chloride solution into a precipitation tank of 20 m<3>, wherein the volume of the solution is 1.6*1.8 m<3>, and the solution contains 500 to 600 kilograms of rare earth; adding 100 to 200 milliliters of JU-cleaning agent, and adjusting the concentration of feed liquor to be between 40 and 80 g/L; adding 80 to 100g/L ammonium hydrogen carbonate solution slowly with stirring at the flow rate of between 3 and 5 m<3>/s and precipitating at the temperature of between 40 and 80 DEG C; and after a reaction is finished, stopping stirring, clarifying, spin-drying by using a centrifugal machine, and leaching for multiple times by using the JU-cleaning agent until the pH value is between 6 and 7 to obtain an oil-free cerium carbonate product. The process can be used for preparing rare-earth carbonates of the cleaning catalyst for the automobile tail gas directly, so that the effect of removing oil stain is achieved, and the produced product does not contain any oil stain.
Description
Technical field
The present invention is the cleaning catalyst for vehicle exhaust, belongs to preparation technology's method of rare earth new material.
Background technology
At present, the cerous carbonate of selling on the market is directly to use the product of ammonium bicarbonate precipitation after extract and separate, owing to contain the liquid process extract and separate of cerium, can bring a spot of extractant into is grease.Add and contain a spot of oily dispersant in the carbonic hydroammonium again, cause and also contain certain greasy dirt in the product that is settled out.With the cleaning catalyst for tail gases of automobiles of this production, in use at high temperature separate out fouling and stop up clarifier owing to greasy dirt, reduced the effect of catalyst.
Summary of the invention
The invention provides a kind of nothing oil cerous carbonate for cleaning catalyst for tail gases of automobiles, this cerous carbonate does not contain any greasy dirt, not only make catalyst that big activity and stability are arranged, also can improve the conversion ratio of tail gas, reduce harmful gas emission, also avoided the problem of catalyst fouling on exhaust purifier.In use catalytic effect reduces, shortcomings such as oxygen storage capacity difference.
The present invention is for solving this technical barrier, the technical scheme that adopts is the solution of cerium chloride by oxidation that will obtain after the extract and separate and the ammonium bicarbonate soln that is used for precipitating reagent, chemical fibre is used for adsorbent and JU-cleaning agent as washing agent, filter through chemical fibre, the greasy dirt in two kinds of solution all is adsorbed on the chemical fibre.Solution after the filtration precipitates again, and its sediment can obtain oil-free cerium carbonate with a kind of detergent washing for several times, gets rid of the greasy dirt in the product.
Description of drawings
Fig. 1 is process chart of the present invention
1, the ammonium bicarbonate soln that obtains after the solution of cerium chloride by oxidation that the extraction tank separation is obtained and the dissolving is squeezed into head tank control flow velocity 5-8m respectively
3/ s flows into chemical fibre Filter column (the dress post amount of fiber is 70-80%, column volume φ 500 * 2000) through head tank, and the solution after the filtration flows into receiving slit respectively, squeezes into behind the head tank stand-by again.This solution all removes through chemical fibre absorption greasy dirt.
Again solution of cerium chloride by oxidation is added 20m
3(volume 1.6 * 1.8m in the stillpot
3, contain rare earth 500-600kg) and adjust feed concentration 40-80g/L after adding the 100-200mLJU-cleaning agent, slowly add ammonium bicarbonate soln (concentration 80-100g/L, flow velocity 3-5m in the stirring
3/ s, precipitation temperature 40-80 ℃) question response fully the back, stop to stir, heavy clear back dries with centrifuge, namely obtains oil-free cerium carbonate.
2, the ammonium bicarbonate soln that obtains after the solution of cerium chloride by oxidation that the extraction tank separation is obtained and the dissolving is squeezed into head tank control flow velocity 5-8m respectively
3/ s flows into chemical fibre Filter column (the dress post amount of fiber is 70-80%, column volume φ 500 * 2000) through head tank, and the solution after the filtration flows into receiving slit respectively, and it is stand-by to squeeze into head tank again.This solution all removes through chemical fibre absorption greasy dirt.
Again solution of cerium chloride by oxidation is added 20m
3(volume 1.6 * 1.8m in the stillpot
3, contain rare earth 500-600kg) and adjust feed concentration 40-80g/L after adding the 100-200mLJU-cleaning agent, slowly add ammonium bicarbonate soln (concentration 80-100g/L, flow velocity 3-5m in the stirring
3/ s, precipitation temperature 40-80 ℃) question response fully the back, stop to stir, heavy clear back dries with centrifuge, namely obtains oil-free cerium carbonate.
This product of the present invention can be directly used in the preparation of cleaning catalyst for tail gases of automobiles, in use owing to do not contain greasy dirt, under high-temperature condition, can not produce the fouling of greasy dirt and stop up clarifier, use this raw material can improve the oxygen storage capacity of catalyst, improve the decentralization of reactive metal, improve the catalytic activity at active metal particles interface, promote aqueous vapor to transform and steam reforming reaction.And can improve the mobility of Lattice Oxygen, thereby the performance of catalyst is significantly improved.
The specific embodiment
Embodiment 1
The present invention has passed through the pilot scale stage, at 5m after the research and development in laboratory
3Produce as a trial in the stillpot, its process conditions are that the ammonium bicarbonate soln after the solution of cerium chloride by oxidation after the extract and separate and the dissolving is squeezed into (cell body amasss φ 1400 * 1400) control flow velocity (500-1000L/s) in the head tank respectively, (the dress post amount position groove of fiber is 70-80% to flow into the nylon fiber Filter column through head tank, column volume φ 300 * 1500), solution after the filtration flows into respectively and connects liquid bath, it is stand-by to squeeze into head tank then, solution through nylon fiber absorption all removes greasy dirt, again solution of cerium chloride by oxidation is added 5m
3In the stillpot, and after adding JU-cleaning agent 100mL, adjust feed concentration 40-80g/L, slowly add ammonium bicarbonate soln in the stirring, after question response finishes, stop to stir, sink clear, dry with centrifuge, add pure water again and wash to PH6-7, namely get oil-free cerium carbonate after the drying.
Embodiment 2
Extraction tank separated the ammonium bicarbonate soln that obtains after the solution of cerium chloride by oxidation obtain and the dissolving and squeeze into head tank control flow velocity 5-8m respectively
3/ s flows into polyster fibre Filter column (the dress post amount of fiber is 70-80%, column volume φ 500 * 2000) through head tank, and the solution after the filtration flows into receiving slit respectively, and it is stand-by to squeeze into head tank then.This solution all removes through polyster fibre absorption greasy dirt.
Again solution of cerium chloride by oxidation is added 20m
3(volume 1.6 * 1.8m in the stillpot
3, contain rare earth 500-600kg) and adjust feed concentration 40-80g/L after adding the 100-200mLJU-cleaning agent, slowly add ammonium bicarbonate soln (concentration 80-100g/L, flow velocity 3-5m in the stirring
3/ s, precipitation temperature 40-80 ℃) question response fully the back, stop to stir, heavy clear back dries with centrifuge, and with JU-cleaning agent drip washing several, the ph value reaches 6-7, namely obtains oil-free cerium carbonate.This product mainly is that outlet is external, and annual demand is bigger.
Claims (1)
1. one kind is used for the preparation method that cleaning catalyst for tail gases of automobiles does not have oily cerous carbonate, it is characterized in that: extraction tank is separated the ammonium bicarbonate soln that obtains after the solution of cerium chloride by oxidation that obtains and the dissolving and squeeze into head tank control flow velocity 5-8m respectively
3/ s flows into the chemical fibre Filter column by head tank, and the solution after the oil removing flows into receiving slit respectively after filtration, squeezes into head tank again, and solution of cerium chloride by oxidation is added 20m
3In the stillpot, adjust feed concentration 40-80g/L behind the adding 100-200mLJU-cleaning agent, slowly add ammonium bicarbonate soln, concentration 80-100g/L, flow velocity 3-5m in the stirring
3/ s, precipitation temperature 40-80 ℃, stop to stir after question response is complete, heavy clear back dries with centrifuge, and with the drip washing of JU-cleaning agent for several times, the pH value reaches 6-7, namely obtains oil-free cerium carbonate, wherein, the dress post amount of fiber is 70-80% in the described fiber filter post, column volume φ 500 * 2000.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010521690 CN102019192B (en) | 2010-10-28 | 2010-10-28 | Process method for oil-free cerium carbonate serving as cleaning catalyst for automobile tail gas |
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| CN 201010521690 CN102019192B (en) | 2010-10-28 | 2010-10-28 | Process method for oil-free cerium carbonate serving as cleaning catalyst for automobile tail gas |
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| CN102019192A CN102019192A (en) | 2011-04-20 |
| CN102019192B true CN102019192B (en) | 2013-07-03 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659163B (en) * | 2012-04-24 | 2014-06-25 | 包头华美稀土高科有限公司 | Technological method for preparing cerium carbonate with high content of rare earth in one step |
| CN110331302B (en) * | 2019-08-13 | 2021-06-08 | 包头稀土研究院 | Method for reducing acid dosage in extraction separation of medium and heavy rare earth |
| CN110306050B (en) * | 2019-08-13 | 2021-04-16 | 包头稀土研究院 | Method for extracting and separating medium-heavy rare earth |
| CN110306045B (en) * | 2019-08-13 | 2021-04-16 | 包头稀土研究院 | Method for removing organic impurities in medium-heavy rare earth chloride solution |
| CN110510653B (en) * | 2019-09-27 | 2021-11-09 | 内蒙古包钢和发稀土有限公司 | Preparation method of neodymium oxide |
| CN111495120B (en) * | 2020-04-23 | 2022-11-01 | 西安三瑞实业有限公司 | Rare earth concentrate acidified tail gas treatment system and method based on indirect-heating type rotary reactor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1569332A (en) * | 2003-07-17 | 2005-01-26 | 中国石油天然气股份有限公司 | Solid catalyst for preparing dialkyl carbonate and its application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01123636A (en) * | 1987-11-04 | 1989-05-16 | Toyota Motor Corp | Production of catalyst for purifying exhaust gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1569332A (en) * | 2003-07-17 | 2005-01-26 | 中国石油天然气股份有限公司 | Solid catalyst for preparing dialkyl carbonate and its application |
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| JP平1-123636A 1989.05.16 |
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