CN1279037C - Method for removing corrosive impurities in inferior sulfolane - Google Patents
Method for removing corrosive impurities in inferior sulfolane Download PDFInfo
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- CN1279037C CN1279037C CN200410064925.9A CN200410064925A CN1279037C CN 1279037 C CN1279037 C CN 1279037C CN 200410064925 A CN200410064925 A CN 200410064925A CN 1279037 C CN1279037 C CN 1279037C
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- sulfolane
- inferior
- inferior sulfolane
- tetramethylene sulfone
- solid alkali
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- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000012535 impurity Substances 0.000 title claims abstract description 22
- 239000007787 solid Substances 0.000 claims abstract description 41
- 239000003513 alkali Substances 0.000 claims abstract description 39
- 239000002594 sorbent Substances 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 11
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical group [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 6
- 229910052728 basic metal Inorganic materials 0.000 claims description 6
- 150000003818 basic metals Chemical class 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 235000017550 sodium carbonate Nutrition 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000292 calcium oxide Substances 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 2
- 239000000347 magnesium hydroxide Substances 0.000 claims description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 2
- 239000002808 molecular sieve Substances 0.000 claims description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 2
- 235000015320 potassium carbonate Nutrition 0.000 claims description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical group [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 abstract description 16
- 239000002904 solvent Substances 0.000 abstract description 10
- 230000002378 acidificating effect Effects 0.000 abstract description 5
- 238000000605 extraction Methods 0.000 abstract description 5
- 239000003463 adsorbent Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 18
- 238000001179 sorption measurement Methods 0.000 description 10
- 230000006866 deterioration Effects 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 7
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 7
- 239000000843 powder Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 235000012254 magnesium hydroxide Nutrition 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 235000012245 magnesium oxide Nutrition 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 1
- 239000003957 anion exchange resin Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 229960000892 attapulgite Drugs 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052625 palygorskite Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to a method for removing corrosive impurities in inferior sulfolane, which solves the problems that inferior sulfolane is difficult to industrialize, the treatment cost is high, the device investment is large and the operation is complex in the prior art, and discloses a method for removing the corrosive impurities in the inferior sulfolane, which has high efficiency, low energy consumption, convenient operation and low treatment cost, wherein the inferior sulfolane passes through a solid alkali adsorbent at room temperature at the flow rate of 0.2-0.5 m/h, the method not only can effectively remove the acidic impurities in the degraded sulfolane, so that the corrosivity of a sulfolane solvent to equipment is greatly reduced, but also can recover the aromatic hydrocarbon solubility and the selectivity to the level of fresh sulfolane; compared with degraded sulfolane, the sulfolane treated by the method has greatly improved aromatic hydrocarbon extraction capacity and extraction rate of more than 90%.
Description
Technical field
The present invention relates to the removal methods of corrosive impurity in a kind of aromatic hydrocarbon extraction solvent inferior, more specifically to the removal methods of corrosive impurity in a kind of inferior sulfolane.
Background technology
The character of tetramethylene sulfone is more stable, and normal temperature and pressure is difficult for down chemical reaction takes place, and severe is big, and is all very good to the solvability and the selectivity of aromatic hydrocarbons, is the important solvent of petrochemical enterprise aromatic extraction unit therefore.But in industrial operational process, the color of sulfolane solvent deepens gradually, and deterioration forms acidic substance, and pH value descends, and causes equipment corrosion, and solvent loss increases, and makes the extracting ability drop.These all have a strong impact on the economic benefit and the normal operation of sulfolane unit.For a long time, prevent that the deterioration of tetramethylene sulfone from failing to be solved preferably all the time, both at home and abroad extensively the countermeasure that adopts is to be injected with the deterioration that the chain alkanolamine suppresses tetramethylene sulfone, wherein monoethanolamine use many, but its effect is not very desirable.
The United States Patent (USP) 4820849 that on April 11st, 1989 authorized discloses a kind of method that reduces corrosive impurity in the sulfolane solvent, this method joins polyprotonic acid or multi-anhydride in the sulfolane solvent, form solid with acidic impurities, this solid is separated with liquid phase solvent, can reach the purpose that reduces corrosive impurity in the sulfolane solvent.Though this method can alleviate the etching problem of tetramethylene sulfone, the solid matter of its generation will be difficult to separate, and be difficult for realizing industrial applications.The United States Patent (USP) 5053137 that on October 1st, 1991 authorized discloses with placed in-line Zeo-karb and anionite-exchange resin exchange column, makes the character of tetramethylene sulfone be improved.The Chinese patent publication number is CN1230545A, the patent application that open day is on October 6th, 1999 discloses a kind of method with macroreticular weakly base ion exchange resin treatment inferior sulfolane, this method is passed through anion-exchange resin column with inferior sulfolane, acid attack impurity wherein stays in resin layer, and the contained acidic substance of tetramethylene sulfone that flow out resin layer significantly reduce, and the pH value raises.Weak point is that the price of resin is higher, and resin needed to use alkali liquid regeneration after losing efficacy, thereby processing costs is higher, plant investment is big, operation is complicated, so the also not general as yet industrialization of this method.
Summary of the invention
The invention solves in the prior art inferior sulfolane handles and is difficult for industrialization, processing costs is higher, plant investment is big, the operation complicated problems, and the removal methods of corrosive impurity in low, the easy to operate inferior sulfolane of a kind of efficient height, energy consumption is provided.
Technical scheme of the present invention is as follows:
The removal methods of corrosive impurity is with inferior sulfolane at room temperature in the inferior sulfolane of the present invention, by the solid alkali sorbent material, the mixture of the oxide compound that described solid alkali sorbent material is basic metal or alkali earth metal and the carbonate of basic metal or alkali earth metal or supercarbonate loads on the porous adsorbing material of high-ratio surface with 0.2～0.5 meter/hour mean flow rate; Its middle acid substance adsorbs on the solid alkali sorbent material and stays in bed, and the contained acid attack material of tetramethylene sulfone that flows out bed significantly reduces, and the pH value can be elevated to 9, and color becomes light color by dark-brown, thereby the quality of tetramethylene sulfone is improved greatly.
When handling inferior sulfolane, the treatment capacity of tetramethylene sulfone is that the weight ratio of tetramethylene sulfone and solid alkali sorbent material is not more than 200: 1, otherwise treatment capacity is too big, though the pH value of inferior sulfolane can be improved, its pH value often is difficult to reach ideal value; When flowing out the adsorbent bed tetramethylene sulfone pH of solid alkali less than 6 the time, should change the solid alkali sorbent material simultaneously; The porous adsorbing material of high-ratio surface is molecular sieve, aluminum oxide or natural clay; Oxide compound is magnesium oxide, calcium oxide, magnesium hydroxide or calcium hydroxide; Carbonate is yellow soda ash or salt of wormwood; Supercarbonate is saleratus or sodium bicarbonate.
The used solid alkali preparation of adsorbent method of the inventive method is as follows: with oxide compound and the carbonate of basic metal or alkali earth metal or mixture and molecular screen primary powder, aluminum oxide or the natural clay thorough mixing of supercarbonate of basic metal or alkali earth metal, add suitable quantity of water and caking agent, use the twin screw extruder extruded moulding, obtain the solid alkali sorbent material after the oven dry.
The invention has the beneficial effects as follows:
Removal methods efficient height, the energy consumption of corrosive impurity is low, easy to operate in the inferior sulfolane of the present invention, the low and easy industrialization of processing cost; Method of the present invention not only can effectively be removed the acidic impurities in the deterioration tetramethylene sulfone, color becomes light color by dark-brown, make sulfolane solvent reduce greatly, and its aromatic hydrocarbons solvability and selectivity can return to the level of fresh tetramethylene sulfone to the corrodibility of equipment; Compare with the deterioration tetramethylene sulfone with the tetramethylene sulfone that the present invention handled, the extracting ability of aromatic hydrocarbons is significantly improved, its extract content reaches more than 90%.
Description of drawings
Fig. 1 is the extracting performance comparison diagram of various tetramethylene sulfone
Embodiment
Embodiment 1～5 is for to remove corrosive impurity in the inferior sulfolane with different solid alkali sorbent materials
Embodiment 1
With 20 gram yellow soda ash, 30 gram magnesium oxide powders and 50 gram 4A molecular screen primary powder thorough mixing, add suitable quantity of water and caking agent, use the twin screw extruder extruded moulding, obtain the solid alkali sorbent material after the oven dry, below be numbered the solid alkali sorbent material No. 1.
No. 1 solid alkali sorbent material of 8 grams is packed in the high 15 centimetres adsorption bed, is 4.429 with pH value then, outward appearance be dark-brown inferior sulfolane at room temperature, with 0.2 meter/hour mean flow rate from bottom to top by adsorption bed, the pH value of mensuration effluent.Reduce to below 6 when the pH of effluent value, stop logical people's tetramethylene sulfone, the results are shown in Table 1.
As shown in Table 1, total treatment capacity: the weight ratio of tetramethylene sulfone and solid alkali sorbent material is 46.07: 1, and the mean ph value of the tetramethylene sulfone after the processing is 7.492.
Table 1
Embodiment 2
30 gram saleratus, 20 gram calcium hydroxides and 50 gram aluminum oxide powders are mixed, add suitable quantity of water and caking agent, use the twin screw extruder extruded moulding, obtain the solid alkali sorbent material after the oven dry, below be numbered the solid alkali sorbent material No. 2.
No. 2 solid alkali sorbent materials of 8.264 grams are packed in the high 15 centimetres adsorption bed, be 4.429 with the pH value then, outward appearance be dark-brown inferior sulfolane at room temperature, from bottom to top by adsorption bed, measure the pH value of effluent with 0.3 meter/hour mean flow rate.Reduce to below 6 when the pH of effluent value, stop logical people's tetramethylene sulfone, the results are shown in Table 2.
As shown in Table 2, total treatment capacity: the weight ratio of tetramethylene sulfone and solid alkali sorbent material is 132.90: 1, and the mean ph value of the tetramethylene sulfone after the processing is 8.219.
Table 2
Embodiment 3
No. 2 solid alkali sorbent materials of 8.0 grams among the embodiment 2 are packed in the high 15 centimetres adsorption bed, be 4.429 with the pH value then, outward appearance be dark-brown inferior sulfolane at room temperature, from bottom to top by adsorption bed, measure the pH value of effluent with 0.5 meter/hour mean flow rate.Reduce to below 6 when the pH of effluent value, stop logical people's tetramethylene sulfone.The results are shown in Table 3.
As shown in Table 3, total treatment capacity: the weight ratio of tetramethylene sulfone and solid alkali sorbent material is 157.67: 1, and the mean ph value of the tetramethylene sulfone after the processing is 8.012.
Table 3
Embodiment 4
30 gram sodium bicarbonates, 22 gram magnesium hydroxides and 50 gram attapulgite powders are mixed, add suitable quantity of water and caking agent, use the twin screw extruder extruded moulding, obtain the solid alkali sorbent material after the oven dry, below be numbered No. 3.
8.5 gram solid alkali sorbent materials are packed in the high 15 centimetres adsorption bed, are 4.429 with the pH value then, outward appearance be dark-brown inferior sulfolane at room temperature, from bottom to top by adsorption bed, measure the pH value of effluent with 0.35 meter/hour mean flow rate.Reduce to below 6 when the pH of effluent value, stop to feed tetramethylene sulfone, the results are shown in Table 4.
As shown in Table 4, total treatment capacity: the weight ratio of tetramethylene sulfone and solid alkali sorbent material is 137.21: 1, and the mean ph value of the tetramethylene sulfone after the processing is 8.278.
Table 4
Embodiment 5
35 gram saleratus, 20 gram magnesium hydroxides and 55 gram diatomites in powder are mixed, add suitable quantity of water and caking agent, use the twin screw extruder extruded moulding, obtain the solid alkali sorbent material after the oven dry, below be numbered No. 4.
No. 4 solid alkali sorbent materials of 8 grams are packed in the high 15 centimetres adsorption bed, are 4.429 with pH value then, outward appearance be dark-brown inferior sulfolane at room temperature, with 0.25 meter/hour mean flow rate from bottom to top by adsorption bed, the pH value of mensuration effluent.Reduce to below 6 when the pH of effluent value, stop to feed tetramethylene sulfone, the results are shown in Table 5.
As shown in Table 5, total treatment capacity: the weight ratio of tetramethylene sulfone and solid alkali sorbent material is 49.40: 1, and the mean ph value of the tetramethylene sulfone after the processing is 8.142.
Table 5
Embodiment 6～11 compares with inferior sulfolane and fresh tetramethylene sulfone performance for the performance of the tetramethylene sulfone that the inventive method was handled, the measuring method of the extract content of tetramethylene sulfone is: in beaker, the hexane solution and the tetramethylene sulfone that quantitatively add aromatic hydrocarbons (being toluene) under the room temperature, the volume ratio of aromatic hydrocarbons solution and tetramethylene sulfone is 1: 2 during the single extracting, stirred 20 minutes, leave standstill 2 hours (this moment, two-phase was separated fully), then upper and lower layer liquid is taken out respectively, take by weighing the quality of taking out surplus phase, take out the toluene level of Yu Xiangzhong then with the chromatographic instrument analysis.Ask for the quality of toluene in the extraction mutually by material balance, thereby obtain extract content.Aromatic hydrocarbons solution is formed by analytically pure toluene and normal hexane configuration, and the volume ratio of two components is 1: 1.
Embodiment 6
Present embodiment is investigated the extracting performance of deterioration tetramethylene sulfone to aromatic hydrocarbons.
In beaker, add 50 milliliters of 25 milliliters of the hexane solutions of aromatic hydrocarbons (being toluene) and deterioration tetramethylene sulfone under the room temperature, stirred 20 minutes, leave standstill 2 hours (this moment, two-phase was separated fully), then upper and lower layer liquid is taken out and takes by weighing the quality of taking out surplus phase respectively, take out the toluene level of Yu Xiangzhong then with the gas chromatograph analysis, the results are shown in Table 6 and Fig. 1.
Embodiment 7
Present embodiment is investigated the extracting performance of fresh tetramethylene sulfone to aromatic hydrocarbons, and experimental technique and analytical procedure be with embodiment 6, the results are shown in Table 6 and Fig. 1.
Embodiment 8
Present embodiment is investigated among the embodiment 1 with the extracting performance of the tetramethylene sulfone after No. 1 solid alkali sorbent treatment to aromatic hydrocarbons, and experimental technique and analytical procedure be with embodiment 6, the results are shown in Table 6 and Fig. 1.
Embodiment 9
Present embodiment is investigated among the embodiment 2 with the extracting performance of the tetramethylene sulfone after No. 2 solid alkali sorbent treatment to aromatic hydrocarbons, and experimental technique and analytical procedure be with embodiment 6, the results are shown in Table 6 and Fig. 1.
Embodiment 10
Present embodiment is investigated among the embodiment 4 with the extracting performance of the tetramethylene sulfone after No. 3 solid alkali sorbent treatment to aromatic hydrocarbons, and proved recipe method and analytical procedure be with embodiment 6, the results are shown in Table 6 and Fig. 1.
Embodiment 11
Present embodiment is investigated among the embodiment 5 with the extracting performance of the tetramethylene sulfone after No. 4 solid alkali sorbent treatment to aromatic hydrocarbons.Experimental technique and analytical procedure are with embodiment 6.The results are shown in Table 6 and Fig. 1.
Can find out that by table 6 and Fig. 1 through the tetramethylene sulfone after No. 1, No. 2, No. 3 and No. 4 solid alkali sorbent treatment, its extracting performance obviously improves, and almost reaches the extracting ability of fresh tetramethylene sulfone.
The extracting performance of the various tetramethylene sulfone of table 6
| Type | Extract content (%) |
| The deterioration tetramethylene sulfone | 82.6 |
| Fresh tetramethylene sulfone | 95.3 |
| With the tetramethylene sulfone after No. 1 solid alkali sorbent treatment | 91.8 |
| With the tetramethylene sulfone after No. 2 solid alkali sorbent treatment | 90.3 |
| With the tetramethylene sulfone after No. 3 solid alkali sorbent treatment | 90.86 |
| With the tetramethylene sulfone after No. 4 solid alkali sorbent treatment | 91.23 |
Claims (6)
1, the removal methods of corrosive impurity in a kind of inferior sulfolane, it is characterized in that at room temperature inferior sulfolane, by the solid alkali sorbent material, the mixture of the oxide compound that described solid alkali sorbent material is basic metal or alkali earth metal and the carbonate of basic metal or alkali earth metal or supercarbonate loads on the porous adsorbing material of high-ratio surface with 0.2～0.5 meter/hour mean flow rate.
2, the removal methods of corrosive impurity in the inferior sulfolane according to claim 1 is characterized in that the weight ratio of inferior sulfolane and solid alkali sorbent material is not more than 200: 1.
3, the removal methods of corrosive impurity in the inferior sulfolane according to claim 1, the porous adsorbing material that it is characterized in that described high-ratio surface is molecular sieve, aluminum oxide or natural clay.
4, the removal methods of corrosive impurity in the inferior sulfolane according to claim 1 is characterized in that described oxide compound is magnesium oxide, calcium oxide, magnesium hydroxide or calcium hydroxide.
5, the removal methods of corrosive impurity in the inferior sulfolane according to claim 1 is characterized in that described carbonate is yellow soda ash or salt of wormwood.
6, the removal methods of corrosive impurity in the inferior sulfolane according to claim 1 is characterized in that described supercarbonate is saleratus or sodium bicarbonate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200410064925.9A CN1279037C (en) | 2004-10-12 | 2004-10-12 | Method for removing corrosive impurities in inferior sulfolane |
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| CN200410064925.9A CN1279037C (en) | 2004-10-12 | 2004-10-12 | Method for removing corrosive impurities in inferior sulfolane |
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| CN1279037C true CN1279037C (en) | 2006-10-11 |
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| CN100425606C (en) * | 2006-11-13 | 2008-10-15 | 大连联化化学有限公司 | Reclamation method of sulfolane containing inorganic salt |
| CN106957297A (en) * | 2016-12-31 | 2017-07-18 | 光华（营口）化工技术服务有限公司 | A kind of renovation process of inferior sulfolane solvent |
| CN108314673A (en) * | 2017-01-18 | 2018-07-24 | 北京思践通科技发展有限公司 | A kind of purification method of sulfolane |
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